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Neue","sans-serif";font-weight:400;font-style:normal;color:#666666;color:inherit;font-size:0.875rem;line-height:1.25rem;}</style><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">文档中心</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">关于 TiDB</div></div><style data-emotion="css xjq79n">.css-xjq79n{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;width:1em;height:1em;display:inline-block;fill:currentColor;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;-webkit-transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;font-size:1.5rem;fill:#999999;height:1rem;width:1rem;margin-left:auto;-webkit-transform:none;-moz-transform:none;-ms-transform:none;transform:none;}</style><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div><style data-emotion="css 1jozaee">.css-1jozaee{margin:0;padding:0;margin-left:17px;}</style></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">快速上手</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">应用开发</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">部署标准集群</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">数据迁移</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">数据集成</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">运维操作</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-8" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">监控与告警</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-9" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">故障诊断</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-10" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">性能调优</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-11" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">教程</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="true" id="left-nav-treeview-0-12" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content Mui-expanded" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiDB 工具</div></div><style data-emotion="css 171pefp">.css-171pefp{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;width:1em;height:1em;display:inline-block;fill:currentColor;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;-webkit-transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;font-size:1.5rem;fill:#999999;height:1rem;width:1rem;margin-left:auto;-webkit-transform:rotate(90deg);-moz-transform:rotate(90deg);-ms-transform:rotate(90deg);transform:rotate(90deg);}</style><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-171pefp" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div><style data-emotion="css 1xxsnna">.css-1xxsnna{height:auto;overflow:visible;-webkit-transition:height 300ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:height 300ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;margin:0;padding:0;margin-left:17px;}</style><ul class="MuiCollapse-root MuiCollapse-vertical MuiTreeItem-group MuiCollapse-entered css-1xxsnna" style="min-height:0px" role="group"><div class="MuiCollapse-wrapper MuiCollapse-vertical css-hboir5"><div class="MuiCollapse-wrapperInner MuiCollapse-vertical css-8atqhb"><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><style data-emotion="css kb2j4b">.css-kb2j4b{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;min-height:1.75rem;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;padding-left:0.5rem;padding-top:0.25rem;padding-bottom:0.25rem;}</style><div class="css-kb2j4b"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ecosystem-tool-user-guide"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">功能概览</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ecosystem-tool-user-case"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">使用场景</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/download-ecosystem-tools"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">工具下载</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-12-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiUP</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/tidb-operator-overview"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiDB Operator</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-12-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiDB Data Migration</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-12-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiDB Lightning</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/dumpling-overview"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">Dumpling</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="true" id="left-nav-treeview-0-12-8" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content Mui-expanded" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiCDC</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-171pefp" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div><ul class="MuiCollapse-root MuiCollapse-vertical MuiTreeItem-group MuiCollapse-entered css-1xxsnna" style="min-height:0px" role="group"><div class="MuiCollapse-wrapper MuiCollapse-vertical css-hboir5"><div class="MuiCollapse-wrapperInner MuiCollapse-vertical css-8atqhb"><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><style data-emotion="css snygwd">.css-snygwd{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;min-height:1.75rem;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;padding-left:1rem;padding-top:0.25rem;padding-bottom:0.25rem;}</style><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ticdc-overview"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">概述</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/deploy-ticdc"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">安装部署与集群运维</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-12-8-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">Changefeed</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-12-8-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">监控告警</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="true" id="left-nav-treeview-0-12-8-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content Mui-expanded" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">参考指南</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-171pefp" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div><ul class="MuiCollapse-root MuiCollapse-vertical MuiTreeItem-group MuiCollapse-entered css-1xxsnna" style="min-height:0px" role="group"><div class="MuiCollapse-wrapper MuiCollapse-vertical css-hboir5"><div class="MuiCollapse-wrapperInner MuiCollapse-vertical css-8atqhb"><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-4-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><style data-emotion="css 5fc025">.css-5fc025{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;min-height:1.75rem;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;padding-left:1.5rem;padding-top:0.25rem;padding-bottom:0.25rem;}</style><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ticdc-architecture"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">架构设计与原理</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-4-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ticdc-server-config"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiCDC Server 配置参数</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-4-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ticdc-changefeed-config"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiCDC Changefeed 配置参数</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="true" id="left-nav-treeview-0-12-8-4-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content Mui-expanded" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">输出数据协议</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-171pefp" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div><ul class="MuiCollapse-root MuiCollapse-vertical MuiTreeItem-group MuiCollapse-entered css-1xxsnna" style="min-height:0px" role="group"><div class="MuiCollapse-wrapper MuiCollapse-vertical css-hboir5"><div class="MuiCollapse-wrapperInner MuiCollapse-vertical css-8atqhb"><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-4-3-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><style data-emotion="css 108qnny">.css-108qnny{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;min-height:1.75rem;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;padding-left:2rem;padding-top:0.25rem;padding-bottom:0.25rem;}</style><div class="css-108qnny"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ticdc-avro-protocol"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiCDC Avro Protocol</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-4-3-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content Mui-expanded" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-108qnny"><a aria-current="page" style="text-decoration:none;width:100%;color:inherit" class="" href="/zh/tidb/stable/ticdc-canal-json"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiCDC Canal-JSON Protocol</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-4-3-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-108qnny"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ticdc-open-protocol"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiCDC Open Protocol</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-4-3-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-108qnny"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ticdc-csv"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiCDC CSV Protocol</div></div></a></div></div></div></li></div></div></ul></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-4-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ticdc-open-api-v2"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiCDC Open API v2</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-4-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ticdc-open-api"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiCDC Open API v1</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-12-8-4-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiCDC 数据消费</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-4-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-5fc025"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ticdc-compatibility"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">兼容性</div></div></a></div></div></div></li></div></div></ul></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/troubleshoot-ticdc"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">故障处理</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ticdc-faq"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">常见问题解答</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-12-8-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-snygwd"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/ticdc-glossary"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">术语表</div></div></a></div></div></div></li></div></div></ul></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-12-9" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiDB Binlog</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-12-10" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">PingCAP Clinic 诊断服务</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-12-11" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiSpark</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-12-12" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">sync-diff-inspector</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-12-13" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiUniManager</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li></div></div></ul></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">参考指南</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-14" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">常见问题解答 (FAQ)</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">版本发布历史</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-16" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/glossary"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">术语表</div></div></a></div></div></div></li></ul></div></aside><style data-emotion="css sb2sd0">.css-sb2sd0{width:100%;}@media (min-width:1200px){.css-sb2sd0{max-width:calc(100% - 18.75rem);}}</style><main class="MuiBox-root css-sb2sd0"><style data-emotion="css 1rnnmjb">.css-1rnnmjb{max-width:1340px;width:100%;margin-left:auto;margin-right:auto;display:block;box-sizing:border-box;}</style><div class="MuiBox-root css-1rnnmjb"><style data-emotion="css 90fn5w">.css-90fn5w{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:column;-ms-flex-direction:column;flex-direction:column;}@media (min-width:0px){.css-90fn5w{-webkit-flex-direction:column-reverse;-ms-flex-direction:column-reverse;flex-direction:column-reverse;}}@media (min-width:600px){.css-90fn5w{-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;}}</style><div class="css-90fn5w"><style data-emotion="css vofosd">.css-vofosd{padding:1.5rem 0;}@media (min-width:0px){.css-vofosd{width:100%;}}@media (min-width:600px){.css-vofosd{width:calc(100% - 17.5rem);}}</style><div class="MuiBox-root css-vofosd"><style data-emotion="css 1ekb41w">.css-1ekb41w{width:100%;margin-left:auto;box-sizing:border-box;margin-right:auto;display:block;padding-left:16px;padding-right:16px;}@media (min-width:600px){.css-1ekb41w{padding-left:24px;padding-right:24px;}}@media (min-width:1536px){.css-1ekb41w{max-width:1536px;}}</style><div class="MuiContainer-root MuiContainer-maxWidthXl doc-content css-1ekb41w"><div class="markdown-body MuiBox-root css-0"><h1 id="ticdc-canal-json-protocol" style="position:relative"><a href="#ticdc-canal-json-protocol" aria-label="ticdc canal json protocol permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>TiCDC Canal-JSON Protocol</h1><p>Canal-JSON 是由 <a href="https://github.com/alibaba/canal" target="_blank" referrerpolicy="no-referrer-when-downgrade">Alibaba Canal</a> 定义的一种数据交换格式协议。通过本文，你可以了解 TiCDC 对 Canal-JSON 数据格式的实现，包括 TiDB 扩展字段、Canal-JSON 数据格式定义，以及和官方实现进行对比等相关内容。</p><h2 id="使用-canal-json" style="position:relative"><a href="#%E4%BD%BF%E7%94%A8-canal-json" aria-label="使用 canal json permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>使用 Canal-JSON</h2><p>当使用 MQ (Message Queue) 作为下游 Sink 时，你可以在 <code>sink-uri</code> 中指定使用 Canal-JSON，TiCDC 将以 Event 为基本单位封装构造 Canal-JSON Message，向下游发送 TiDB 的数据变更事件。</p><p>Event 分为三类：</p><ul><li>DDL Event：代表 DDL 变更记录，在上游成功执行 DDL 语句后发出，DDL Event 会被发送到索引为 0 的 MQ Partition。</li><li>DML Event：代表一行数据变更记录，在行变更发生时该类 Event 被发出，包含变更后该行的相关信息。</li><li>WATERMARK Event：代表一个特殊的时间点，表示在这个时间点前收到的 Event 是完整的。仅适用于 TiDB 扩展字段，当你在 <code>sink-uri</code> 中设置 <code>enable-tidb-extension=true</code> 时生效。</li></ul><p>使用 <code>Canal-JSON</code> 时的配置样例如下所示：</p><pre><code class="hljs language-sh"><style data-emotion="css 1qhimia">.css-1qhimia{margin-right:3rem;overflow:auto;}</style><div class="MuiBox-root css-1qhimia">cdc cli changefeed create --server=http://127.0.0.1:8300 --changefeed-id=<span class="hljs-string">"kafka-canal-json"</span> --sink-uri=<span class="hljs-string">"kafka://127.0.0.1:9092/topic-name?kafka-version=2.4.0&amp;protocol=canal-json"</span> </div><style data-emotion="css ux9q70">.css-ux9q70{text-align:center;-webkit-flex:0 0 auto;-ms-flex:0 0 auto;flex:0 0 auto;font-size:1.5rem;padding:8px;border-radius:50%;overflow:visible;color:rgba(0, 0, 0, 0.54);-webkit-transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;padding:5px;font-size:1.125rem;top:0.625rem;right:2.4rem;background:transparent;border:unset;}.css-ux9q70:hover{background-color:rgba(0, 0, 0, 0.04);}@media (hover: none){.css-ux9q70:hover{background-color:transparent;}}.css-ux9q70.Mui-disabled{background-color:transparent;color:rgba(0, 0, 0, 0.26);}</style><style data-emotion="css 1rmx1rm">.css-1rmx1rm{display:-webkit-inline-box;display:-webkit-inline-flex;display:-ms-inline-flexbox;display:inline-flex;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;-webkit-box-pack:center;-ms-flex-pack:center;-webkit-justify-content:center;justify-content:center;position:relative;box-sizing:border-box;-webkit-tap-highlight-color:transparent;background-color:transparent;outline:0;border:0;margin:0;border-radius:0;padding:0;cursor:pointer;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;vertical-align:middle;-moz-appearance:none;-webkit-appearance:none;-webkit-text-decoration:none;text-decoration:none;color:inherit;text-align:center;-webkit-flex:0 0 auto;-ms-flex:0 0 auto;flex:0 0 auto;font-size:1.5rem;padding:8px;border-radius:50%;overflow:visible;color:rgba(0, 0, 0, 0.54);-webkit-transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;padding:5px;font-size:1.125rem;top:0.625rem;right:2.4rem;background:transparent;border:unset;}.css-1rmx1rm::-moz-focus-inner{border-style:none;}.css-1rmx1rm.Mui-disabled{pointer-events:none;cursor:default;}@media print{.css-1rmx1rm{-webkit-print-color-adjust:exact;color-adjust:exact;}}.css-1rmx1rm:hover{background-color:rgba(0, 0, 0, 0.04);}@media (hover: none){.css-1rmx1rm:hover{background-color:transparent;}}.css-1rmx1rm.Mui-disabled{background-color:transparent;color:rgba(0, 0, 0, 0.26);}</style><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><style data-emotion="css 1cw4hi4">.css-1cw4hi4{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;width:1em;height:1em;display:inline-block;fill:currentColor;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;-webkit-transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;font-size:inherit;}</style><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="WrapTextIcon"><path d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3 3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"/></svg></button><style data-emotion="css 1e2dcm1">.css-1e2dcm1{z-index:1500;pointer-events:none;}</style><style data-emotion="css okvapm">.css-okvapm{z-index:1500;pointer-events:none;}</style><style data-emotion="css rnn29l">.css-rnn29l{text-align:center;-webkit-flex:0 0 auto;-ms-flex:0 0 auto;flex:0 0 auto;font-size:1.5rem;padding:8px;border-radius:50%;overflow:visible;color:rgba(0, 0, 0, 0.54);-webkit-transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;padding:5px;font-size:1.125rem;top:0.625rem;right:0.625rem;background:transparent;border:unset;}.css-rnn29l:hover{background-color:rgba(0, 0, 0, 0.04);}@media (hover: none){.css-rnn29l:hover{background-color:transparent;}}.css-rnn29l.Mui-disabled{background-color:transparent;color:rgba(0, 0, 0, 0.26);}</style><style data-emotion="css fxo539">.css-fxo539{display:-webkit-inline-box;display:-webkit-inline-flex;display:-ms-inline-flexbox;display:inline-flex;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;-webkit-box-pack:center;-ms-flex-pack:center;-webkit-justify-content:center;justify-content:center;position:relative;box-sizing:border-box;-webkit-tap-highlight-color:transparent;background-color:transparent;outline:0;border:0;margin:0;border-radius:0;padding:0;cursor:pointer;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;vertical-align:middle;-moz-appearance:none;-webkit-appearance:none;-webkit-text-decoration:none;text-decoration:none;color:inherit;text-align:center;-webkit-flex:0 0 auto;-ms-flex:0 0 auto;flex:0 0 auto;font-size:1.5rem;padding:8px;border-radius:50%;overflow:visible;color:rgba(0, 0, 0, 0.54);-webkit-transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:background-color 150ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;padding:5px;font-size:1.125rem;top:0.625rem;right:0.625rem;background:transparent;border:unset;}.css-fxo539::-moz-focus-inner{border-style:none;}.css-fxo539.Mui-disabled{pointer-events:none;cursor:default;}@media print{.css-fxo539{-webkit-print-color-adjust:exact;color-adjust:exact;}}.css-fxo539:hover{background-color:rgba(0, 0, 0, 0.04);}@media (hover: none){.css-fxo539:hover{background-color:transparent;}}.css-fxo539.Mui-disabled{background-color:transparent;color:rgba(0, 0, 0, 0.26);}</style><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-fxo539" tabindex="0" type="button" aria-label="copy"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ContentCopyIcon"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg></button></code></pre><h2 id="tidb-扩展字段" style="position:relative"><a href="#tidb-%E6%89%A9%E5%B1%95%E5%AD%97%E6%AE%B5" aria-label="tidb 扩展字段 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>TiDB 扩展字段</h2><p>Canal-JSON 协议本是为 MySQL 设计的，其中并不包含 TiDB 专有的 CommitTS 事务唯一标识等重要字段。为了解决这个问题，TiCDC 在 Canal-JSON 协议格式中附加了 TiDB 扩展字段。在 <code>sink-uri</code> 中设置 <code>enable-tidb-extension</code> 为 <code>true</code>（默认为 <code>false</code>）后，TiCDC 生成 Canal-JSON 消息时的行为如下：</p><ul><li>TiCDC 发送的 DML Event 和 DDL Event 类型消息中，将会含有一个名为 <code>_tidb</code> 的字段。</li><li>TiCDC 将会发送 WATERMARK Event 消息。·</li></ul><p>配置样例如下所示：</p><pre><code class="hljs language-sh"><div class="MuiBox-root css-1qhimia">cdc cli changefeed create --server=http://127.0.0.1:8300 --changefeed-id=<span class="hljs-string">"kafka-canal-json-enable-tidb-extension"</span> --sink-uri=<span class="hljs-string">"kafka://127.0.0.1:9092/topic-name?kafka-version=2.4.0&amp;protocol=canal-json&amp;enable-tidb-extension=true"</span> </div><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="WrapTextIcon"><path d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3 3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"/></svg></button><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-fxo539" tabindex="0" type="button" aria-label="copy"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ContentCopyIcon"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg></button></code></pre><h2 id="message-格式定义" style="position:relative"><a href="#message-%E6%A0%BC%E5%BC%8F%E5%AE%9A%E4%B9%89" aria-label="message 格式定义 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>Message 格式定义</h2><p>下面介绍 DDL Event、DML Event 和 WATERMARK Event 的格式定义，以及消费端的数据解析。</p><h3 id="ddl-event" style="position:relative"><a href="#ddl-event" aria-label="ddl event permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>DDL Event</h3><p>TiCDC 会把一个 DDL Event 编码成如下 Canal-JSON 格式：</p><pre><code class="hljs language-json"><div class="MuiBox-root css-1qhimia"><span class="hljs-punctuation">{</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"database"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"test"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"table"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">""</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"pkNames"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">null</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"isDdl"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">true</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"QUERY"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"es"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1639633094670</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"ts"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1639633095489</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"sql"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"drop database if exists test"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"sqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">null</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"mysqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">null</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"data"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">null</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"old"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">null</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"_tidb"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-comment">// TiDB 的扩展字段</span> <span class="hljs-attr">"commitTs"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">163963309467037594</span> </div><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="WrapTextIcon"><path d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3 3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"/></svg></button><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-fxo539" tabindex="0" type="button" aria-label="copy"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ContentCopyIcon"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg></button></code></pre><p>以上 JSON 数据的字段解释如下：</p><table><thead><tr><th align="left">字段</th><th align="left">类型</th><th align="left">说明</th></tr></thead><tbody><tr><td align="left">id</td><td align="left">Number</td><td align="left">TiCDC 默认值为 0</td></tr><tr><td align="left">database</td><td align="left">String</td><td align="left">Row 所在的 Database 的名字</td></tr><tr><td align="left">table</td><td align="left">String</td><td align="left">Row 所在的 Table 的名字</td></tr><tr><td align="left">pkNames</td><td align="left">Array</td><td align="left">组成 primary key 的所有列的名字</td></tr><tr><td align="left">isDdl</td><td align="left">Bool</td><td align="left">该条消息是否为 DDL 事件</td></tr><tr><td align="left">type</td><td align="left">String</td><td align="left">Canal-JSON 定义的事件类型</td></tr><tr><td align="left">es</td><td align="left">Number</td><td align="left">产生该条消息的事件发生时的 13 位（毫秒级）时间戳</td></tr><tr><td align="left">ts</td><td align="left">Number</td><td align="left">TiCDC 生成该条消息时的 13 位（毫秒级）时间戳</td></tr><tr><td align="left">sql</td><td align="left">String</td><td align="left">当 isDdl 为 true 时，记录对应的 DDL 语句</td></tr><tr><td align="left">sqlType</td><td align="left">Object</td><td align="left">当 isDdl 为 false 时，记录每一列数据类型在 Java 中的类型表示</td></tr><tr><td align="left">mysqlType</td><td align="left">object</td><td align="left">当 isDdl 为 false 时，记录每一列数据类型在 MySQL 中的类型表示</td></tr><tr><td align="left">data</td><td align="left">Object</td><td align="left">当 isDdl 为 false 时，记录每一列的名字及其数据值</td></tr><tr><td align="left">old</td><td align="left">Object</td><td align="left">仅当该条消息由 Update 类型事件产生时，记录每一列的名字，和 Update 之前的数据值</td></tr><tr><td align="left">_tidb</td><td align="left">Object</td><td align="left">TiDB 扩展字段，仅当 <code>enable-tidb-extension</code> 为 true 时才会存在。其中的 <code>commitTs</code> 值为造成 Row 变更的事务的 TSO</td></tr></tbody></table><h3 id="dml-event" style="position:relative"><a href="#dml-event" aria-label="dml event permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>DML Event</h3><p>对于一行 DML 数据变更事件，TiCDC 会将其编码成如下形式:</p><pre><code class="hljs language-json"><div class="MuiBox-root css-1qhimia"><span class="hljs-punctuation">{</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"database"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"test"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"table"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"tp_int"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"pkNames"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-attr">"isDdl"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">false</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"INSERT"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"es"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1639633141221</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"ts"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1639633142960</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"sql"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">""</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"sqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"c_bigint"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">-5</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_int"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">4</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_mediumint"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">4</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_smallint"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">5</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_tinyint"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">-6</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">4</span> <span class="hljs-attr">"mysqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"c_bigint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"bigint"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_int"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"int"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_mediumint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"mediumint"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_smallint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"smallint"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_tinyint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"tinyint"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"int"</span> <span class="hljs-attr">"data"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-attr">"c_bigint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"9223372036854775807"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_int"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"2147483647"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_mediumint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"8388607"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_smallint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"32767"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_tinyint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"127"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"2"</span> <span class="hljs-attr">"old"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">null</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"_tidb"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-comment">// TiDB 的扩展字段</span> <span class="hljs-attr">"commitTs"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">163963314122145239</span> </div><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="WrapTextIcon"><path d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3 3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"/></svg></button><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-fxo539" tabindex="0" type="button" aria-label="copy"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ContentCopyIcon"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg></button></code></pre><h3 id="watermark-event" style="position:relative"><a href="#watermark-event" aria-label="watermark event permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>WATERMARK Event</h3><p>仅当 <code>enable-tidb-extension</code> 为 <code>true</code> 时，TiCDC 才会发送 WATERMARK Event，其 <code>type</code> 字段值为 <code>TIDB_WATERMARK</code>。该类型事件具有 <code>_tidb</code> 字段，当前只含有 <code>watermarkTs</code>，其值为该 Event 发送时的 TSO。</p><p>当你收到一个该类型的事件，所有 <code>commitTs</code> 小于 <code>watermarkTs</code> 的事件均已发送完毕。因为 TiCDC 提供 At Least Once 语义，可能出现重复发送数据的情况。如果后续收到有 <code>commitTs</code> 小于 <code>watermarkTs</code> 的事件，可以忽略。</p><p>WATERMARK Event 的示例如下：</p><pre><code class="hljs language-json"><div class="MuiBox-root css-1qhimia"><span class="hljs-punctuation">{</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"database"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">""</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"table"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">""</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"pkNames"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">null</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"isDdl"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">false</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"TIDB_WATERMARK"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"es"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1640007049196</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"ts"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">1640007050284</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"sql"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">""</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"sqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">null</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"mysqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">null</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"data"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">null</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"old"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">null</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"_tidb"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-comment">// TiDB 的扩展字段</span> <span class="hljs-attr">"watermarkTs"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">429918007904436226</span> </div><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="WrapTextIcon"><path d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3 3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"/></svg></button><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-fxo539" tabindex="0" type="button" aria-label="copy"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ContentCopyIcon"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg></button></code></pre><h3 id="消费端数据解析" style="position:relative"><a href="#%E6%B6%88%E8%B4%B9%E7%AB%AF%E6%95%B0%E6%8D%AE%E8%A7%A3%E6%9E%90" aria-label="消费端数据解析 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>消费端数据解析</h3><p>从上面的示例中可知，Canal-JSON 具有统一的数据格式，针对不同的事件类型，有不同的字段填充规则。消费者可以使用统一的方法对该 JSON 格式的数据进行解析，然后通过判断字段值的方式，来确定具体事件类型：</p><ul><li>当 <code>isDdl</code> 为 true 时，该消息含有一条 DDL Event。</li><li>当 <code>isDdl</code> 为 false 时，需要对 <code>type</code> 字段加以判断。如果 <code>type</code> 为 <code>TIDB_WATERMARK</code>，可得知其为 WATERMARK Event，否则就是 DML Event。</li></ul><h2 id="字段说明" style="position:relative"><a href="#%E5%AD%97%E6%AE%B5%E8%AF%B4%E6%98%8E" aria-label="字段说明 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>字段说明</h2><p>Canal-JSON 格式会在 <code>mysqlType</code> 字段和 <code>sqlType</code> 字段中记录对应的数据类型。</p><h3 id="mysql-type-字段" style="position:relative"><a href="#mysql-type-%E5%AD%97%E6%AE%B5" aria-label="mysql type 字段 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>MySQL Type 字段</h3><p>Canal-JSON 格式会在 <code>mysqlType</code> 字段中记录每一列的 MySQL Type 的字符串表示。相关详情可以参考 <a href="/zh/tidb/stable/data-type-overview">TiDB Data Types</a>。</p><h3 id="sql-type-字段" style="position:relative"><a href="#sql-type-%E5%AD%97%E6%AE%B5" aria-label="sql type 字段 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>SQL Type 字段</h3><p>Canal-JSON 格式会在 <code>sqlType</code> 字段中记录每一列的 Java SQL Type，即每条数据在 JDBC 中对应的数据类型，其值可以通过 MySQL Type 和具体数据值计算得到。具体对应关系如下:</p><table><thead><tr><th align="left">MySQL Type</th><th align="left">Java SQL Type Code</th></tr></thead><tbody><tr><td align="left">Boolean</td><td align="left">-6</td></tr><tr><td align="left">Float</td><td align="left">7</td></tr><tr><td align="left">Double</td><td align="left">8</td></tr><tr><td align="left">Decimal</td><td align="left">3</td></tr><tr><td align="left">Char</td><td align="left">1</td></tr><tr><td align="left">Varchar</td><td align="left">12</td></tr><tr><td align="left">Binary</td><td align="left">2004</td></tr><tr><td align="left">Varbinary</td><td align="left">2004</td></tr><tr><td align="left">Tinytext</td><td align="left">2005</td></tr><tr><td align="left">Text</td><td align="left">2005</td></tr><tr><td align="left">Mediumtext</td><td align="left">2005</td></tr><tr><td align="left">Longtext</td><td align="left">2005</td></tr><tr><td align="left">Tinyblob</td><td align="left">2004</td></tr><tr><td align="left">Blob</td><td align="left">2004</td></tr><tr><td align="left">Mediumblob</td><td align="left">2004</td></tr><tr><td align="left">Longblob</td><td align="left">2004</td></tr><tr><td align="left">Date</td><td align="left">91</td></tr><tr><td align="left">Datetime</td><td align="left">93</td></tr><tr><td align="left">Timestamp</td><td align="left">93</td></tr><tr><td align="left">Time</td><td align="left">92</td></tr><tr><td align="left">Year</td><td align="left">12</td></tr><tr><td align="left">Enum</td><td align="left">4</td></tr><tr><td align="left">Set</td><td align="left">-7</td></tr><tr><td align="left">Bit</td><td align="left">-7</td></tr><tr><td align="left">JSON</td><td align="left">12</td></tr></tbody></table><h2 id="整数类型" style="position:relative"><a href="#%E6%95%B4%E6%95%B0%E7%B1%BB%E5%9E%8B" aria-label="整数类型 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>整数类型</h2><p>你需要考虑<a href="/zh/tidb/stable/data-type-numeric#整数类型">整数类型</a>是否有 <code>Unsigned</code> 约束，以及当前取值大小，分别对应不同的 Java SQL Type Code。如下表所示。</p><table><thead><tr><th align="left">MySQL Type String</th><th align="left">Value Range</th><th align="left">Java SQL Type Code</th></tr></thead><tbody><tr><td align="left">tinyint</td><td align="left">[-128, 127]</td><td align="left">-6</td></tr><tr><td align="left">tinyint unsigned</td><td align="left">[0, 127]</td><td align="left">-6</td></tr><tr><td align="left">tinyint unsigned</td><td align="left">[128, 255]</td><td align="left">5</td></tr><tr><td align="left">smallint</td><td align="left">[-32768, 32767]</td><td align="left">5</td></tr><tr><td align="left">smallint unsigned</td><td align="left">[0, 32767]</td><td align="left">5</td></tr><tr><td align="left">smallint unsigned</td><td align="left">[32768, 65535]</td><td align="left">4</td></tr><tr><td align="left">mediumint</td><td align="left">[-8388608, 8388607]</td><td align="left">4</td></tr><tr><td align="left">mediumint unsigned</td><td align="left">[0, 8388607]</td><td align="left">4</td></tr><tr><td align="left">mediumint unsigned</td><td align="left">[8388608, 16777215]</td><td align="left">4</td></tr><tr><td align="left">int</td><td align="left">[-2147483648, 2147483647]</td><td align="left">4</td></tr><tr><td align="left">int unsigned</td><td align="left">[0, 2147483647]</td><td align="left">4</td></tr><tr><td align="left">int unsigned</td><td align="left">[2147483648, 4294967295]</td><td align="left">-5</td></tr><tr><td align="left">bigint</td><td align="left">[-9223372036854775808, 9223372036854775807]</td><td align="left">-5</td></tr><tr><td align="left">bigint unsigned</td><td align="left">[0, 9223372036854775807]</td><td align="left">-5</td></tr><tr><td align="left">bigint unsigned</td><td align="left">[9223372036854775808, 18446744073709551615]</td><td align="left">3</td></tr></tbody></table><p>TiCDC 涉及的 Java SQL Type 及其 Code 映射关系如下表所示。</p><table><thead><tr><th align="left">Java SQL Type</th><th align="left">Java SQL Type Code</th></tr></thead><tbody><tr><td align="left">CHAR</td><td align="left">1</td></tr><tr><td align="left">DECIMAL</td><td align="left">3</td></tr><tr><td align="left">INTEGER</td><td align="left">4</td></tr><tr><td align="left">SMALLINT</td><td align="left">5</td></tr><tr><td align="left">REAL</td><td align="left">7</td></tr><tr><td align="left">DOUBLE</td><td align="left">8</td></tr><tr><td align="left">VARCHAR</td><td align="left">12</td></tr><tr><td align="left">DATE</td><td align="left">91</td></tr><tr><td align="left">TIME</td><td align="left">92</td></tr><tr><td align="left">TIMESTAMP</td><td align="left">93</td></tr><tr><td align="left">BLOB</td><td align="left">2004</td></tr><tr><td align="left">CLOB</td><td align="left">2005</td></tr><tr><td align="left">BIGINT</td><td align="left">-5</td></tr><tr><td align="left">TINYINT</td><td align="left">-6</td></tr><tr><td align="left">Bit</td><td align="left">-7</td></tr></tbody></table><p>想要了解 Java SQL Type 的更多信息，请参考 <a href="https://docs.oracle.com/javase/8/docs/api/java/sql/Types.html" target="_blank" referrerpolicy="no-referrer-when-downgrade">Java SQL Class Types</a>。</p><h2 id="ticdc-canal-json-和-canal-官方实现对比" style="position:relative"><a href="#ticdc-canal-json-%E5%92%8C-canal-%E5%AE%98%E6%96%B9%E5%AE%9E%E7%8E%B0%E5%AF%B9%E6%AF%94" aria-label="ticdc canal json 和 canal 官方实现对比 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>TiCDC Canal-JSON 和 Canal 官方实现对比</h2><p>TiCDC 对 Canal-JSON 数据格式的实现，包括 <code>Update</code> 类型事件和 <code>mysqlType</code> 字段，和官方有些许不同。主要差异见下表。</p><table><thead><tr><th align="left">差异点</th><th align="left">TiCDC</th><th align="left">Canal</th></tr></thead><tbody><tr><td align="left"><code>Update</code> 类型事件</td><td align="left"><code>old</code> 字段包含所有列数据</td><td align="left"><code>old</code> 字段仅包含被修改的列数据</td></tr><tr><td align="left"><code>mysqlType</code> 字段</td><td align="left">对于含有参数的类型，没有类型参数信息</td><td align="left">对于含有参数的类型，会包含完整的参数信息</td></tr></tbody></table><h3 id="update-类型事件" style="position:relative"><a href="#update-%E7%B1%BB%E5%9E%8B%E4%BA%8B%E4%BB%B6" aria-label="update 类型事件 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a><code>Update</code> 类型事件</h3><p>对于 <code>Update</code> 类型事件，Canal 官方实现中，<code>old</code> 字段仅包含被修改的列数据，而 TiCDC 的实现则包含所有列数据。</p><p>假设在上游 TiDB 按顺序执行如下 SQL 语句:</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">create</span> <span class="hljs-keyword">table</span> tp_int id <span class="hljs-type">int</span> auto_increment, c_tinyint tinyint <span class="hljs-keyword">null</span>, c_smallint <span class="hljs-type">smallint</span> <span class="hljs-keyword">null</span>, c_mediumint mediumint <span class="hljs-keyword">null</span>, c_int <span class="hljs-type">int</span> <span class="hljs-keyword">null</span>, c_bigint <span class="hljs-type">bigint</span> <span class="hljs-keyword">null</span>, <span class="hljs-keyword">constraint</span> pk <span class="hljs-keyword">primary</span> key (id) <span class="hljs-keyword">insert</span> <span class="hljs-keyword">into</span> tp_int(c_tinyint, c_smallint, c_mediumint, c_int, c_bigint) <span class="hljs-keyword">values</span> (<span class="hljs-number">127</span>, <span class="hljs-number">32767</span>, <span class="hljs-number">8388607</span>, <span class="hljs-number">2147483647</span>, <span class="hljs-number">9223372036854775807</span>); <span class="hljs-keyword">update</span> tp_int <span class="hljs-keyword">set</span> c_int <span class="hljs-operator">=</span> <span class="hljs-number">0</span>, c_tinyint <span class="hljs-operator">=</span> <span class="hljs-number">0</span> <span class="hljs-keyword">where</span> c_smallint <span class="hljs-operator">=</span> <span class="hljs-number">32767</span>; </div><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="WrapTextIcon"><path d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3 3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"/></svg></button><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-fxo539" tabindex="0" type="button" aria-label="copy"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ContentCopyIcon"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg></button></code></pre><p>对于 <code>update</code> 语句，TiCDC 将会输出一条 <code>type</code> 为 <code>UPDATE</code> 的事件消息，如下所示。该 <code>update</code> 语句仅对 <code>c_int</code> 和 <code>c_tinyint</code> 两列进行了修改。输出事件消息的 <code>old</code> 字段，则包含所有列数据。</p><pre><code class="hljs language-json"><div class="MuiBox-root css-1qhimia"><span class="hljs-punctuation">{</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"UPDATE"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"sqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"mysqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"data"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-attr">"c_bigint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"9223372036854775807"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_int"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_mediumint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"8388607"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_smallint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"32767"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_tinyint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"2"</span> <span class="hljs-attr">"old"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-comment">// TiCDC 输出事件消息的 `old` 字段，则包含所有列数据。</span> <span class="hljs-attr">"c_bigint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"9223372036854775807"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_int"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"2147483647"</span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// 修改的列</span> <span class="hljs-attr">"c_mediumint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"8388607"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_smallint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"32767"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_tinyint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"127"</span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// 修改的列</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"2"</span> </div><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="WrapTextIcon"><path d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3 3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"/></svg></button><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-fxo539" tabindex="0" type="button" aria-label="copy"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ContentCopyIcon"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg></button></code></pre><p>官方 Canal 输出事件消息的 <code>old</code> 字段仅包含被修改的列数据。示例如下。</p><pre><code class="hljs language-json"><div class="MuiBox-root css-1qhimia"><span class="hljs-punctuation">{</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"type"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"UPDATE"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"sqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"mysqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"data"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-attr">"c_bigint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"9223372036854775807"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_int"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_mediumint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"8388607"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_smallint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"32767"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_tinyint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"0"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"2"</span> <span class="hljs-attr">"old"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-comment">// Canal 输出事件消息的 `old` 字段，仅包含被修改的列的数据。</span> <span class="hljs-attr">"c_int"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"2147483647"</span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// 修改的列</span> <span class="hljs-attr">"c_tinyint"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"127"</span><span class="hljs-punctuation">,</span> <span class="hljs-comment">// 修改的列</span> </div><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="WrapTextIcon"><path d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3 3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"/></svg></button><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-fxo539" tabindex="0" type="button" aria-label="copy"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ContentCopyIcon"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg></button></code></pre><h3 id="mysqltype-字段" style="position:relative"><a href="#mysqltype-%E5%AD%97%E6%AE%B5" aria-label="mysqltype 字段 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a><code>mysqlType</code> 字段</h3><p>对于 <code>mysqlType</code> 字段，Canal 官方实现中，对于含有参数的类型，会包含完整的参数信息，TiCDC 实现则没有类型参数信息。</p><p>在下面示例的表定义 SQL 语句中，如 decimal / char / varchar / enum 等类型，都含有参数。对比 TiCDC 和 Canal 官方实现分别生成的 Canal-JSON 格式数据可知，在 <code>mysqlType</code> 字段中的数据，TiCDC 实现只包含基本 MySQL Type。如果业务需要类型参数信息，需要你自行通过其他方式实现。</p><p>假设在上游数据库按顺序执行如下 SQL 语句:</p><pre><code class="hljs language-sql"><div class="MuiBox-root css-1qhimia"><span class="hljs-keyword">create</span> <span class="hljs-keyword">table</span> t ( id <span class="hljs-type">int</span> auto_increment, c_decimal <span class="hljs-type">decimal</span>(<span class="hljs-number">10</span>, <span class="hljs-number">4</span>) <span class="hljs-keyword">null</span>, c_char <span class="hljs-type">char</span>(<span class="hljs-number">16</span>) <span class="hljs-keyword">null</span>, c_varchar <span class="hljs-type">varchar</span>(<span class="hljs-number">16</span>) <span class="hljs-keyword">null</span>, c_binary <span class="hljs-type">binary</span>(<span class="hljs-number">16</span>) <span class="hljs-keyword">null</span>, c_varbinary <span class="hljs-type">varbinary</span>(<span class="hljs-number">16</span>) <span class="hljs-keyword">null</span>, c_enum enum(<span class="hljs-string">'a'</span>,<span class="hljs-string">'b'</span>,<span class="hljs-string">'c'</span>) <span class="hljs-keyword">null</span>, c_set <span class="hljs-keyword">set</span>(<span class="hljs-string">'a'</span>,<span class="hljs-string">'b'</span>,<span class="hljs-string">'c'</span>) <span class="hljs-keyword">null</span>, c_bit bit(<span class="hljs-number">64</span>) <span class="hljs-keyword">null</span>, <span class="hljs-keyword">constraint</span> pk <span class="hljs-keyword">primary</span> key (id) <span class="hljs-keyword">insert</span> <span class="hljs-keyword">into</span> t (c_decimal, c_char, c_varchar, c_binary, c_varbinary, c_enum, c_set, c_bit) <span class="hljs-keyword">values</span> (<span class="hljs-number">123.456</span>, "abc", "abc", "abc", "abc", <span class="hljs-string">'a'</span>, <span class="hljs-string">'a,b'</span>, b<span class="hljs-string">'1000001'</span>); </div><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="WrapTextIcon"><path d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3 3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"/></svg></button><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-fxo539" tabindex="0" type="button" aria-label="copy"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ContentCopyIcon"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg></button></code></pre><p>TiCDC 输出内容如下：</p><pre><code class="hljs language-json"><div class="MuiBox-root css-1qhimia"><span class="hljs-punctuation">{</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"isDdl"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">false</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"sqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"mysqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"c_binary"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"binary"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_bit"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"bit"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_char"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"char"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_decimal"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"decimal"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_enum"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"enum"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_set"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"set"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_varbinary"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"varbinary"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_varchar"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"varchar"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"int"</span> <span class="hljs-attr">"data"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-attr">"old"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">null</span><span class="hljs-punctuation">,</span> </div><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="WrapTextIcon"><path d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3 3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"/></svg></button><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-fxo539" tabindex="0" type="button" aria-label="copy"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ContentCopyIcon"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg></button></code></pre><p>Canal 官方实现输出内容如下：</p><pre><code class="hljs language-json"><div class="MuiBox-root css-1qhimia"><span class="hljs-punctuation">{</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">0</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"isDdl"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">false</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"sqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"mysqlType"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">{</span> <span class="hljs-attr">"c_binary"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"binary(16)"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_bit"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"bit(64)"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_char"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"char(16)"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_decimal"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"decimal(10, 4)"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_enum"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"enum('a','b','c')"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_set"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"set('a','b','c')"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_varbinary"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"varbinary(16)"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"c_varchar"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"varchar(16)"</span><span class="hljs-punctuation">,</span> <span class="hljs-attr">"id"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"int"</span> <span class="hljs-attr">"data"</span><span class="hljs-punctuation">:</span> <span class="hljs-punctuation">[</span> <span class="hljs-attr">"old"</span><span class="hljs-punctuation">:</span> <span class="hljs-keyword">null</span><span class="hljs-punctuation">,</span> </div><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-1rmx1rm" tabindex="0" type="button" aria-label="Toggle code wrap"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="WrapTextIcon"><path d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3 3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"/></svg></button><button class="MuiButtonBase-root MuiIconButton-root MuiIconButton-sizeSmall css-fxo539" tabindex="0" type="button" aria-label="copy"><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ContentCopyIcon"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg></button></code></pre><h2 id="ticdc-canal-json-改动说明" style="position:relative"><a href="#ticdc-canal-json-%E6%94%B9%E5%8A%A8%E8%AF%B4%E6%98%8E" aria-label="ticdc canal json 改动说明 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>TiCDC Canal-JSON 改动说明</h2><h3 id="delete-类型事件中-old-字段的变化说明" style="position:relative"><a href="#delete-%E7%B1%BB%E5%9E%8B%E4%BA%8B%E4%BB%B6%E4%B8%AD-old-%E5%AD%97%E6%AE%B5%E7%9A%84%E5%8F%98%E5%8C%96%E8%AF%B4%E6%98%8E" aria-label="delete 类型事件中 old 字段的变化说明 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a><code>Delete</code> 类型事件中 <code>Old</code> 字段的变化说明</h3><p>TiCDC 实现的 Canal-JSON 格式，v5.4.0 及以后版本的实现，和之前的有些许不同，具体如下：</p><ul><li><code>Delete</code> 类型事件，<code>Old</code> 字段的内容发生了变化。</li></ul><p>如下是一个 <code>DELETE</code> 事件的数据内容，在 v5.4.0 前的实现中，"old" 的内容和 "data" 相同，在 v5.4.0 及之后的实现中，"old" 将被设为 null。你可以通过 "data" 字段获取到被删除的数据。</p><pre><code class="hljs language-sh"><div class="MuiBox-root css-1qhimia">{ <span class="hljs-string">"id"</span>: 0, <span class="hljs-string">"database"</span>: <span class="hljs-string">"test"</span>, <span class="hljs-string">"type"</span>: <span class="hljs-string">"DELETE"</span>, <span class="hljs-string">"sqlType"</span>: { <span class="hljs-string">"mysqlType"</span>: { <span class="hljs-string">"data"</span>: [ <span class="hljs-string">"c_bigint"</span>: <span class="hljs-string">"9223372036854775807"</span>, <span class="hljs-string">"c_int"</span>: <span class="hljs-string">"0"</span>, <span class="hljs-string">"c_mediumint"</span>: <span class="hljs-string">"8388607"</span>, <span class="hljs-string">"c_smallint"</span>: <span class="hljs-string">"32767"</span>, <span class="hljs-string">"c_tinyint"</span>: <span class="hljs-string">"0"</span>, <span class="hljs-string">"id"</span>: <span class="hljs-string">"2"</span> <span class="hljs-string">"old"</span>: null, // 以下示例是 v5.4.0 之前的实现，`old` 内容等同于 `data` 内容 <span class="hljs-string">"old"</span>: [ <span class="hljs-string">"c_bigint"</span>: <span class="hljs-string">"9223372036854775807"</span>, <span class="hljs-string">"c_int"</span>: <span class="hljs-string">"0"</span>, <span class="hljs-string">"c_mediumint"</span>: <span class="hljs-string">"8388607"</span>, <span class="hljs-string">"c_smallint"</span>: <span class="hljs-string">"32767"</span>,