{"id":633,"date":"2018-03-01T14:46:27","date_gmt":"2018-03-01T06:46:27","guid":{"rendered":"https:\/\/blog.jsjs.org\/?p=633"},"modified":"2018-03-01T14:46:27","modified_gmt":"2018-03-01T06:46:27","slug":"%e3%80%90%e6%ba%90%e7%a0%81%e3%80%91canal%e5%92%8cotter%e7%9a%84%e9%ab%98%e5%8f%af%e9%9d%a0%e6%80%a7%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/blog.jsjs.org\/?p=633","title":{"rendered":"\u3010\u6e90\u7801\u3011canal\u548cotter\u7684\u9ad8\u53ef\u9760\u6027\u5206\u6790"},"content":{"rendered":"<p>\u4e00\u822c\u6765\u8bf4\uff0c\u6211\u4eec\u5bf9\u4e8e\u6570\u636e\u5e93\u6700\u4e3b\u8981\u7684\u8981\u6c42\u5c31\u662f\uff1a\u6570\u636e\u4e0d\u4e22\u3002\u4e0d\u7ba1\u662f\u4e3b\u4ece\u590d\u5236\uff0c\u8fd8\u662f\u4f7f\u7528\u7c7b\u4f3cotter+canal\u8fd9\u6837\u7684\u6570\u636e\u5e93\u540c\u6b65\u65b9\u6848\uff0c\u6211\u4eec\u6700\u57fa\u672c\u7684\u9700\u6c42\u662f\uff0c\u5728\u6570\u636e\u4e0d\u4e22\u5931\u7684\u524d\u63d0\u4e0b\uff0c\u5c3d\u53ef\u80fd\u7684\u4fdd\u8bc1\u7cfb\u7edf\u7684\u9ad8\u53ef\u7528\uff0c\u4e5f\u5c31\u662f\u5728\u67d0\u4e2a\u8282\u70b9\u6302\u6389\uff0c\u6216\u8005\u6570\u636e\u5e93\u53d1\u751f\u4e3b\u4ece\u5207\u6362\u7b49\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u7684\u6570\u636e\u540c\u6b65\u7cfb\u7edf\u4f9d\u7136\u80fd\u591f\u53d1\u6325\u5b83\u7684\u4f5c\u7528&#8211;\u6570\u636e\u540c\u6b65\u3002\u672c\u6587\u8ba8\u8bba\u7684\u573a\u666f\u662f\u6570\u636e\u5e93\u53d1\u751f\u4e3b\u4ece\u5207\u6362\uff0c\u672c\u6587\u5c06\u4ece\u6e90\u7801\u7684\u89d2\u5ea6\uff0c\u6765\u770b\u770botter\u548ccanal\u662f\u5982\u4f55\u4fdd\u8bc1\u9ad8\u53ef\u7528\u548c\u9ad8\u53ef\u9760\u7684\u3002<\/p>\n<h2 id=\"\u4e00eventparser\">\u4e00\u3001EventParser<\/h2>\n<p>\u901a\u8fc7\u9605\u8bfb\u6587\u6863\u548c\u6e90\u7801\uff0c\u6211\u4eec\u53ef\u4ee5\u77e5\u9053\uff0c\u5bf9\u4e8e\u4e00\u4e2acanal server\uff0c\u57fa\u7840\u7684\u6846\u67b6\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u90e8\u5206\uff1aMetaManager\u3001EventParser\u3001EventSink\u548cEventStore\u3002\u5176\u4e2dEventParser\u7684\u4f5c\u7528\u5c31\u662f\u53d1\u9001dump\u547d\u4ee4\uff0c\u4ecemysql\u6570\u636e\u5e93\u83b7\u53d6binlog\u6587\u4ef6\u3002\u53d1\u9001dump\u547d\u4ee4\uff0c\u53ef\u4ee5\u6307\u5b9a\u65f6\u95f4\u6233\u6216\u8005position\uff0c\u4ece\u6307\u5b9a\u7684\u65f6\u95f4\u6216\u8005\u4f4d\u7f6e\u5f00\u59cbdump\u3002\u6211\u4eec\u6765\u770b\u770b\u8fc7\u7a0b\uff1a<\/p>\n<p>\u9996\u5148\u662fCanalServer\u542f\u52a8\u3002otter\u9ed8\u8ba4\u4f7f\u7528\u7684\u662f\u5185\u7f6e\u7248\u7684canal server\uff0c\u6240\u4ee5\u6211\u4eec\u4e3b\u8981\u770bCanalServerWithEmbedded\u8fd9\u4e2a\u7c7b\u3002\u6765\u770b\u4e0b\u4ed6\u7684\u542f\u52a8\u8fc7\u7a0b\uff1a<\/p>\n<div class=\"sourceCode\">\n<pre class=\"sourceCode java\"><code class=\"sourceCode java hljs\">    <span class=\"kw\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span><\/span><\/span> <span class=\"dt\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">void<\/span><\/span><\/span> <span class=\"fu\"><span class=\"hljs-function\"><span class=\"hljs-title\">start<\/span><\/span><\/span><span class=\"hljs-function\"><span class=\"hljs-params\">(<\/span><\/span><span class=\"dt\"><span class=\"hljs-function\"><span class=\"hljs-params\"><span class=\"hljs-keyword\">final<\/span><\/span><\/span><\/span><span class=\"hljs-function\"><span class=\"hljs-params\"> String destination)<\/span> <\/span>{\n        <span class=\"dt\"><span class=\"hljs-keyword\">final<\/span><\/span> CanalInstance canalInstance = canalInstances.<span class=\"fu\">get<\/span>(destination);\n        <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (!canalInstance.<span class=\"fu\">isStart<\/span>()) {\n            <span class=\"kw\"><span class=\"hljs-keyword\">try<\/span><\/span> {\n                MDC.<span class=\"fu\">put<\/span>(<span class=\"st\"><span class=\"hljs-string\">\"destination\"<\/span><\/span>, destination);\n                canalInstance.<span class=\"fu\">start<\/span>();<span class=\"co\"><span class=\"hljs-comment\">\/\/\u542f\u52a8\u5b9e\u4f8b<\/span><\/span>\n                logger.<span class=\"fu\">info<\/span>(<span class=\"st\"><span class=\"hljs-string\">\"start CanalInstances[{}] successfully\"<\/span><\/span>, destination);\n            } <span class=\"kw\"><span class=\"hljs-keyword\">finally<\/span><\/span> {\n                MDC.<span class=\"fu\">remove<\/span>(<span class=\"st\"><span class=\"hljs-string\">\"destination\"<\/span><\/span>);\n            }\n        }\n    }<\/code><\/pre>\n<\/div>\n<p>\u6211\u4eec\u770b\u4e0b\u5b9e\u4f8b\u542f\u52a8\u90a3\u4e00\u884c\uff0c\u8ddf\u5230AbstractCanalInstance\u7c7b\u4e2d<\/p>\n<div class=\"sourceCode\">\n<pre class=\"sourceCode java\"><code class=\"sourceCode java hljs\">    <span class=\"kw\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span><\/span><\/span> <span class=\"dt\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">void<\/span><\/span><\/span> <span class=\"fu\"><span class=\"hljs-function\"><span class=\"hljs-title\">start<\/span><\/span><\/span><span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> <\/span>{\n        <span class=\"kw\"><span class=\"hljs-keyword\">super<\/span><\/span>.<span class=\"fu\">start<\/span>();\n        <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (!metaManager.<span class=\"fu\">isStart<\/span>()) {\n            metaManager.<span class=\"fu\">start<\/span>();<span class=\"co\"><span class=\"hljs-comment\">\/\/\u6e90\u6570\u636e\u7ba1\u7406\u542f\u52a8<\/span><\/span>\n        }\n\n        <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (!alarmHandler.<span class=\"fu\">isStart<\/span>()) {\n            alarmHandler.<span class=\"fu\">start<\/span>();<span class=\"co\"><span class=\"hljs-comment\">\/\/\u62a5\u8b66\u5904\u7406\u5668\u542f\u52a8<\/span><\/span>\n        }\n\n        <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (!eventStore.<span class=\"fu\">isStart<\/span>()) {\n            eventStore.<span class=\"fu\">start<\/span>();<span class=\"co\"><span class=\"hljs-comment\">\/\/\u6570\u636e\u5b58\u50a8\u5668\u542f\u52a8<\/span><\/span>\n        }\n\n        <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (!eventSink.<span class=\"fu\">isStart<\/span>()) {\n            eventSink.<span class=\"fu\">start<\/span>();<span class=\"co\"><span class=\"hljs-comment\">\/\/\u6570\u636e\u8fc7\u6ee4\u5668\u542f\u52a8<\/span><\/span>\n        }\n\n        <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (!eventParser.<span class=\"fu\">isStart<\/span>()) {<span class=\"co\"><span class=\"hljs-comment\">\/\/\u6570\u636e\u89e3\u6790\u5668\u542f\u52a8<\/span><\/span>\n            <span class=\"fu\">beforeStartEventParser<\/span>(eventParser);\n            eventParser.<span class=\"fu\">start<\/span>();\n            <span class=\"fu\">afterStartEventParser<\/span>(eventParser);\n        }\n        logger.<span class=\"fu\">info<\/span>(<span class=\"st\"><span class=\"hljs-string\">\"start successful....\"<\/span><\/span>);\n    }<\/code><\/pre>\n<\/div>\n<p>\u6211\u4eec\u4e3b\u8981\u770b\u4e0beventParser.start()\u65b9\u6cd5\u91cc\u9762\u7684\u5185\u5bb9\u3002\u6211\u4eec\u4e3b\u8981\u5173\u6ce8\u7684\u662fEventParser\u4f7f\u5982\u4f55\u5728\u4e3b\u4ece\u5207\u6362\u7684\u6761\u4ef6\u4e0b\uff0c\u8fdb\u884cdump\u8282\u70b9\u7684\u786e\u5b9a\u7684\u3002\u6211\u4eec\u8ddf\u8e2a\u5230AbstractEventParser\u7c7b\u4e2d\u7684start()\u65b9\u6cd5\uff0c\u91cd\u70b9\u770b\u4e0b<\/p>\n<div class=\"sourceCode\">\n<pre class=\"sourceCode java\"><code class=\"sourceCode java hljs\"><span class=\"co\"><span class=\"hljs-comment\">\/\/ 4. \u83b7\u53d6\u6700\u540e\u7684\u4f4d\u7f6e\u4fe1\u606f<\/span><\/span>\nEntryPosition position = <span class=\"fu\">findStartPosition<\/span>(erosaConnection);<\/code><\/pre>\n<\/div>\n<p>\u8fd9\u5757\u6709\u4e24\u4e2a\u5b9e\u73b0\uff0c\u4f46\u662fcanal\u76ee\u524d\u4f7f\u7528\u7684\u662fMysqlEventParser\uff0c\u4e5f\u5c31\u662f\u57fa\u4e8eMysql\u7684Binlog\u6587\u4ef6\u6765\u8fdb\u884c\u6570\u636e\u540c\u6b65\u3002\u6211\u4eec\u770b\u4e0b\u4ee3\u7801\uff1a<\/p>\n<div class=\"sourceCode\">\n<pre class=\"sourceCode java\"><code class=\"sourceCode java hljs\"><span class=\"kw\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">protected<\/span><\/span><\/span><span class=\"hljs-function\"> EntryPosition <\/span><span class=\"fu\"><span class=\"hljs-function\"><span class=\"hljs-title\">findStartPosition<\/span><\/span><\/span><span class=\"hljs-function\"><span class=\"hljs-params\">(ErosaConnection connection)<\/span> <\/span><span class=\"kw\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">throws<\/span><\/span><\/span><span class=\"hljs-function\"> IOException <\/span>{\n    EntryPosition startPosition = <span class=\"fu\">findStartPositionInternal<\/span>(connection);\n    <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (needTransactionPosition.<span class=\"fu\">get<\/span>()) {\n        logger.<span class=\"fu\">warn<\/span>(<span class=\"st\"><span class=\"hljs-string\">\"prepare to find last position : {}\"<\/span><\/span>, startPosition.<span class=\"fu\">toString<\/span>());\n        Long preTransactionStartPosition = <span class=\"fu\">findTransactionBeginPosition<\/span>(connection, startPosition);\n        <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (!preTransactionStartPosition.<span class=\"fu\">equals<\/span>(startPosition.<span class=\"fu\">getPosition<\/span>())) {\n            logger.<span class=\"fu\">warn<\/span>(<span class=\"st\"><span class=\"hljs-string\">\"find new start Transaction Position , old : {} , new : {}\"<\/span><\/span>,\n                    startPosition.<span class=\"fu\">getPosition<\/span>(),\n                    preTransactionStartPosition);\n            startPosition.<span class=\"fu\">setPosition<\/span>(preTransactionStartPosition);\n        }\n        needTransactionPosition.<span class=\"fu\">compareAndSet<\/span>(<span class=\"kw\"><span class=\"hljs-keyword\">true<\/span><\/span>, <span class=\"kw\"><span class=\"hljs-keyword\">false<\/span><\/span>);\n    }\n    <span class=\"kw\"><span class=\"hljs-keyword\">return<\/span><\/span> startPosition;\n}<\/code><\/pre>\n<\/div>\n<p>\u5bf9\u4e8e\u7b2c\u4e00\u884cfindStartPositionInternal(connection)\uff0c\u6211\u4eec\u91cd\u70b9\u5173\u6ce8\u7684\u60c5\u51b5\u662f\u6570\u636e\u5e93\u8fde\u63a5\u5730\u5740\u53d1\u751f\u53d8\u5316\uff0c\u4e5f\u5c31\u662f\u8fdb\u884c\u4e86\u4e3b\u4ece\u5207\u6362\u7684\u60c5\u51b5\u3002<\/p>\n<div class=\"sourceCode\">\n<pre class=\"sourceCode java\"><code class=\"sourceCode java hljs\"><span class=\"dt\"><span class=\"hljs-keyword\">boolean<\/span><\/span> case2 = (standbyInfo == <span class=\"kw\"><span class=\"hljs-keyword\">null<\/span><\/span> || standbyInfo.<span class=\"fu\">getAddress<\/span>() == <span class=\"kw\"><span class=\"hljs-keyword\">null<\/span><\/span>)\n                &amp;&amp; logPosition.<span class=\"fu\">getPostion<\/span>().<span class=\"fu\">getServerId<\/span>() != <span class=\"kw\"><span class=\"hljs-keyword\">null<\/span><\/span>\n                &amp;&amp; !logPosition.<span class=\"fu\">getPostion<\/span>().<span class=\"fu\">getServerId<\/span>().<span class=\"fu\">equals<\/span>(<span class=\"fu\">findServerId<\/span>(mysqlConnection));\n<span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (case2) {\n    <span class=\"dt\"><span class=\"hljs-keyword\">long<\/span><\/span> timestamp = logPosition.<span class=\"fu\">getPostion<\/span>().<span class=\"fu\">getTimestamp<\/span>();\n    <span class=\"dt\"><span class=\"hljs-keyword\">long<\/span><\/span> newStartTimestamp = timestamp - fallbackIntervalInSeconds * <span class=\"dv\"><span class=\"hljs-number\">1000<\/span><\/span>;\n    logger.<span class=\"fu\">warn<\/span>(<span class=\"st\"><span class=\"hljs-string\">\"prepare to find start position by last position {}:{}:{}\"<\/span><\/span>, <span class=\"kw\"><span class=\"hljs-keyword\">new<\/span><\/span> Object[]{<span class=\"st\"><span class=\"hljs-string\">\"\"<\/span><\/span>, <span class=\"st\"><span class=\"hljs-string\">\"\"<\/span><\/span>,\n                logPosition.<span class=\"fu\">getPostion<\/span>().<span class=\"fu\">getTimestamp<\/span>()});\n    EntryPosition findPosition = <span class=\"fu\">findByStartTimeStamp<\/span>(mysqlConnection, newStartTimestamp);\n    <span class=\"co\"><span class=\"hljs-comment\">\/\/ \u91cd\u65b0\u7f6e\u4e3a\u4e00\u4e0b<\/span><\/span>\n    dumpErrorCount = <span class=\"dv\"><span class=\"hljs-number\">0<\/span><\/span>;\n    <span class=\"kw\"><span class=\"hljs-keyword\">return<\/span><\/span> findPosition;\n}<\/code><\/pre>\n<\/div>\n<p>\u6211\u4eec\u5206\u6790\u4e0bcase2\u8fd9\u4e2a\u6761\u4ef6\uff0c\u5176\u5b9e\u5c31\u662f\u8868\u793a\u7684\u5c31\u662f\u914d\u7f6e\u4e86\u4e3b\u4ece\u5207\u6362\uff0c\u800c\u4e14\u53d1\u751f\u4e86serverId\u53d8\u5316\u7684\u60c5\u51b5\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u9996\u5148\u9700\u8981\u83b7\u53d6\u5230\u4e8b\u4ef6\u53d1\u751f\u7684\u65f6\u95f4\u6233\uff0c\u7136\u540e\u5c06\u8fd9\u4e2a\u4e8b\u4ef6\u53d1\u751f\u7684\u65f6\u95f4\u51cf\u53bb60s\uff0c\u4e5f\u5c31\u662f\u5411\u524d\u63a8\u4e00\u5206\u949f\u4e4b\u540e\uff0c\u5728\u65b0\u7684binlog\u6587\u4ef6\u4e2d\u6839\u636e\u65b0\u7684\u65f6\u95f4\u6233\u6765\u627e\u5230\u5f53\u65f6\u5bf9\u5e94\u7684\u4e8b\u4ef6\u3002<\/p>\n<p>\u8fd9\u5757\u6839\u636e\u65f6\u95f4\u6233\u6765\u5bfb\u627e\u4e8b\u4ef6\u7684\u8fc7\u7a0b\u6bd4\u8f83\u7b80\u5355\uff0c\u9996\u5148\u6839\u636ebinglog-index\u6587\u4ef6\u627e\u5230\u6240\u6709\u7684binlog\u6587\u4ef6\u540d\uff0c\u7136\u540e\u904d\u5386binlog\u6587\u4ef6\u7684\u5934\uff0c\u627e\u5230binlog\u6587\u4ef6\u7684\u5199\u5165\u65f6\u95f4\uff0c\u4e0e\u65b0\u7684\u65f6\u95f4\u6233\u8fdb\u884c\u5bf9\u6bd4\uff0c\u5b9a\u4f4d\u5230binlog\u6587\u4ef6\u3002\u5b9a\u4f4d\u5230\u6587\u4ef6\u540e\uff0c\u76f4\u63a5\u6839\u636e\u65f6\u95f4\u6233\u6765\u8fdb\u884c\u904d\u5386\uff0c\u627e\u5230\u65b0\u7684\u65f6\u95f4\u6233\u4e4b\u524d\u53d1\u751f\u7684\u90a3\u4e2a\u4e8b\u52a1\u8d77\u59cb\u4f4d\u7f6e\u3002<\/p>\n<div class=\"sourceCode\">\n<pre class=\"sourceCode java\"><code class=\"sourceCode java hljs\"><span class=\"co\"><span class=\"hljs-comment\">\/**<\/span><\/span>\n<span class=\"co\"><span class=\"hljs-comment\"> * \u6839\u636e\u7ed9\u5b9a\u7684\u65f6\u95f4\u6233\uff0c\u5728\u6307\u5b9a\u7684binlog\u4e2d\u627e\u5230\u6700\u63a5\u8fd1\u4e8e\u8be5\u65f6\u95f4\u6233(\u5fc5\u987b\u662f\u5c0f\u4e8e\u65f6\u95f4\u6233)\u7684\u4e00\u4e2a\u4e8b\u52a1\u8d77\u59cb\u4f4d\u7f6e\u3002<\/span><\/span>\n<span class=\"co\"><span class=\"hljs-comment\"> * \u9488\u5bf9\u6700\u540e\u4e00\u4e2abinlog\u4f1a\u7ed9\u5b9aendPosition\uff0c\u907f\u514d\u65e0\u5c3d\u7684\u67e5\u8be2<\/span><\/span>\n<span class=\"co\"><span class=\"hljs-comment\"> *\/<\/span><\/span>\n<span class=\"kw\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">private<\/span><\/span><\/span><span class=\"hljs-function\"> EntryPosition <\/span><span class=\"fu\"><span class=\"hljs-function\"><span class=\"hljs-title\">findAsPerTimestampInSpecificLogFile<\/span><\/span><\/span><span class=\"hljs-function\"><span class=\"hljs-params\">(MysqlConnection mysqlConnection,\n                                                              <\/span><\/span><span class=\"dt\"><span class=\"hljs-function\"><span class=\"hljs-params\"><span class=\"hljs-keyword\">final<\/span><\/span><\/span><\/span><span class=\"hljs-function\"><span class=\"hljs-params\"> Long startTimestamp,\n                                                              <\/span><\/span><span class=\"dt\"><span class=\"hljs-function\"><span class=\"hljs-params\"><span class=\"hljs-keyword\">final<\/span><\/span><\/span><\/span><span class=\"hljs-function\"><span class=\"hljs-params\"> EntryPosition endPosition,\n                                                              <\/span><\/span><span class=\"dt\"><span class=\"hljs-function\"><span class=\"hljs-params\"><span class=\"hljs-keyword\">final<\/span><\/span><\/span><\/span><span class=\"hljs-function\"><span class=\"hljs-params\"> String searchBinlogFile)<\/span> <\/span>{\n\n    <span class=\"dt\"><span class=\"hljs-keyword\">final<\/span><\/span> LogPosition logPosition = <span class=\"kw\"><span class=\"hljs-keyword\">new<\/span><\/span> <span class=\"fu\">LogPosition<\/span>();\n    <span class=\"kw\"><span class=\"hljs-keyword\">try<\/span><\/span> {\n        mysqlConnection.<span class=\"fu\">reconnect<\/span>();\n        <span class=\"co\"><span class=\"hljs-comment\">\/\/ \u5f00\u59cb\u904d\u5386\u6587\u4ef6<\/span><\/span>\n        mysqlConnection.<span class=\"fu\">seek<\/span>(searchBinlogFile, <span class=\"hljs-number\">4L<\/span>, <span class=\"kw\"><span class=\"hljs-keyword\">new<\/span><\/span> SinkFunction&lt;LogEvent&gt;() {\n\n            <span class=\"kw\"><span class=\"hljs-keyword\">private<\/span><\/span> LogPosition lastPosition;\n\n            <span class=\"kw\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span><\/span><\/span> <span class=\"dt\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">boolean<\/span><\/span><\/span> <span class=\"fu\"><span class=\"hljs-function\"><span class=\"hljs-title\">sink<\/span><\/span><\/span><span class=\"hljs-function\"><span class=\"hljs-params\">(LogEvent event)<\/span> <\/span>{\n                EntryPosition entryPosition = <span class=\"kw\"><span class=\"hljs-keyword\">null<\/span><\/span>;\n                <span class=\"kw\"><span class=\"hljs-keyword\">try<\/span><\/span> {\n                    CanalEntry.<span class=\"fu\">Entry<\/span> entry = <span class=\"fu\">parseAndProfilingIfNecessary<\/span>(event);\n                    <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (entry == <span class=\"kw\"><span class=\"hljs-keyword\">null<\/span><\/span>) {\n                        <span class=\"kw\"><span class=\"hljs-keyword\">return<\/span><\/span> <span class=\"kw\"><span class=\"hljs-keyword\">true<\/span><\/span>;\n                    }\n\n                    String logfilename = entry.<span class=\"fu\">getHeader<\/span>().<span class=\"fu\">getLogfileName<\/span>();\n                    Long logfileoffset = entry.<span class=\"fu\">getHeader<\/span>().<span class=\"fu\">getLogfileOffset<\/span>();\n                    Long logposTimestamp = entry.<span class=\"fu\">getHeader<\/span>().<span class=\"fu\">getExecuteTime<\/span>();\n\n                    <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (CanalEntry.<span class=\"fu\">EntryType<\/span>.<span class=\"fu\">TRANSACTIONBEGIN<\/span>.<span class=\"fu\">equals<\/span>(entry.<span class=\"fu\">getEntryType<\/span>())\n                            || CanalEntry.<span class=\"fu\">EntryType<\/span>.<span class=\"fu\">TRANSACTIONEND<\/span>.<span class=\"fu\">equals<\/span>(entry.<span class=\"fu\">getEntryType<\/span>())) {\n                        logger.<span class=\"fu\">debug<\/span>(<span class=\"st\"><span class=\"hljs-string\">\"compare exit condition:{},{},{}, startTimestamp={}...\"<\/span><\/span>, <span class=\"kw\"><span class=\"hljs-keyword\">new<\/span><\/span> Object[]{\n                                logfilename, logfileoffset, logposTimestamp, startTimestamp});\n                        <span class=\"co\"><span class=\"hljs-comment\">\/\/ \u4e8b\u52a1\u5934\u548c\u5c3e\u5bfb\u627e\u7b2c\u4e00\u6761\u8bb0\u5f55\u65f6\u95f4\u6233\uff0c\u5982\u679c\u6700\u5c0f\u7684\u4e00\u6761\u8bb0\u5f55\u90fd\u4e0d\u6ee1\u8db3\u6761\u4ef6\uff0c\u53ef\u76f4\u63a5\u9000\u51fa<\/span><\/span>\n                        <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (logposTimestamp &gt;= startTimestamp) {\n                            <span class=\"kw\"><span class=\"hljs-keyword\">return<\/span><\/span> <span class=\"kw\"><span class=\"hljs-keyword\">false<\/span><\/span>;\n                        }\n                    }\n\n                    <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (StringUtils.<span class=\"fu\">equals<\/span>(endPosition.<span class=\"fu\">getJournalName<\/span>(), logfilename)\n                            &amp;&amp; endPosition.<span class=\"fu\">getPosition<\/span>() &lt;= (logfileoffset + event.<span class=\"fu\">getEventLen<\/span>())) {\n                        <span class=\"kw\"><span class=\"hljs-keyword\">return<\/span><\/span> <span class=\"kw\"><span class=\"hljs-keyword\">false<\/span><\/span>;\n                    }\n\n                    <span class=\"co\"><span class=\"hljs-comment\">\/\/ \u8bb0\u5f55\u4e00\u4e0b\u4e0a\u4e00\u4e2a\u4e8b\u52a1\u7ed3\u675f\u7684\u4f4d\u7f6e\uff0c\u5373\u4e0b\u4e00\u4e2a\u4e8b\u52a1\u7684position<\/span><\/span>\n                    <span class=\"co\"><span class=\"hljs-comment\">\/\/ position = current +<\/span><\/span>\n                    <span class=\"co\"><span class=\"hljs-comment\">\/\/ data.length\uff0c\u4ee3\u8868\u8be5\u4e8b\u52a1\u7684\u4e0b\u4e00\u6761offest\uff0c\u907f\u514d\u591a\u4f59\u7684\u4e8b\u52a1\u91cd\u590d<\/span><\/span>\n                    <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (CanalEntry.<span class=\"fu\">EntryType<\/span>.<span class=\"fu\">TRANSACTIONEND<\/span>.<span class=\"fu\">equals<\/span>(entry.<span class=\"fu\">getEntryType<\/span>())) {\n                        entryPosition = <span class=\"kw\"><span class=\"hljs-keyword\">new<\/span><\/span> <span class=\"fu\">EntryPosition<\/span>(logfilename,\n                                logfileoffset + event.<span class=\"fu\">getEventLen<\/span>(),\n                                logposTimestamp);\n                        logger.<span class=\"fu\">debug<\/span>(<span class=\"st\"><span class=\"hljs-string\">\"set {} to be pending start position before finding another proper one...\"<\/span><\/span>,\n                                entryPosition);\n                        logPosition.<span class=\"fu\">setPostion<\/span>(entryPosition);\n                    } <span class=\"kw\"><span class=\"hljs-keyword\">else<\/span><\/span> <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (CanalEntry.<span class=\"fu\">EntryType<\/span>.<span class=\"fu\">TRANSACTIONBEGIN<\/span>.<span class=\"fu\">equals<\/span>(entry.<span class=\"fu\">getEntryType<\/span>())) {\n                        <span class=\"co\"><span class=\"hljs-comment\">\/\/ \u5f53\u524d\u4e8b\u52a1\u5f00\u59cb\u4f4d\u70b9<\/span><\/span>\n                        entryPosition = <span class=\"kw\"><span class=\"hljs-keyword\">new<\/span><\/span> <span class=\"fu\">EntryPosition<\/span>(logfilename, logfileoffset, logposTimestamp);\n                        logger.<span class=\"fu\">debug<\/span>(<span class=\"st\"><span class=\"hljs-string\">\"set {} to be pending start position before finding another proper one...\"<\/span><\/span>,\n                                entryPosition);\n                        logPosition.<span class=\"fu\">setPostion<\/span>(entryPosition);\n                    }\n\n                    lastPosition = <span class=\"fu\">buildLastPosition<\/span>(entry);\n                } <span class=\"kw\"><span class=\"hljs-keyword\">catch<\/span><\/span> (Throwable e) {\n                    <span class=\"fu\">processSinkError<\/span>(e, lastPosition, searchBinlogFile, <span class=\"hljs-number\">4L<\/span>);\n                }\n\n                <span class=\"kw\"><span class=\"hljs-keyword\">return<\/span><\/span> running;\n            }\n        });\n\n    } <span class=\"kw\"><span class=\"hljs-keyword\">catch<\/span><\/span> (IOException e) {\n        logger.<span class=\"fu\">error<\/span>(<span class=\"st\"><span class=\"hljs-string\">\"ERROR ## findAsPerTimestampInSpecificLogFile has an error\"<\/span><\/span>, e);\n    }\n\n    <span class=\"kw\"><span class=\"hljs-keyword\">if<\/span><\/span> (logPosition.<span class=\"fu\">getPostion<\/span>() != <span class=\"kw\"><span class=\"hljs-keyword\">null<\/span><\/span>) {\n        <span class=\"kw\"><span class=\"hljs-keyword\">return<\/span><\/span> logPosition.<span class=\"fu\">getPostion<\/span>();\n    } <span class=\"kw\"><span class=\"hljs-keyword\">else<\/span><\/span> {\n        <span class=\"kw\"><span class=\"hljs-keyword\">return<\/span><\/span> <span class=\"kw\"><span class=\"hljs-keyword\">null<\/span><\/span>;\n    }\n}<\/code><\/pre>\n<\/div>\n<p>\u8fd9\u5757\u7684\u903b\u8f91\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\u53d1\u9001dump\u547d\u4ee4\uff0c\u8d77\u59cb\u4f4d\u7f6e\u4e3a4L\uff0c\u4e5f\u5c31\u662f\u8df3\u8fc7\u4e86binlog\u7684\u7b2c\u4e00\u4e2a\u6807\u5fd7\u4e8b\u4ef6\u3002<\/li>\n<li>canal\u6536\u5230binlog\uff0c\u5f00\u59cb\u8fdb\u884c\u5bf9binlog\u6587\u4ef6\u8fdb\u884c\u89e3\u6790\u3002<\/li>\n<li>\u4e3b\u8981\u6211\u4eec\u770b\u7684\u662f\u4e8b\u52a1\u5f00\u59cb\u548c\u4e8b\u52a1\u63d0\u4ea4\u7684\u4e8b\u4ef6\uff0c\u5224\u65ad\u4e8b\u52a1\u5f00\u59cb\u6216\u7ed3\u675f\u7684\u65f6\u95f4\uff0c\u662f\u5426\u5c0f\u4e8e\u6211\u4eec\u8981\u627e\u7684\u65f6\u95f4\u6233\uff0c\u5982\u679c\u5927\u4e8e\u7b49\u4e8e\uff0c\u76f4\u63a5\u904d\u5386\u4e0b\u4e00\u4e2a\u4e8b\u4ef6\u3002<\/li>\n<li>\u4f20\u5165\u4e86\u4e00\u4e2aendPosition\uff0c\u9632\u6b62\u65e0\u9650\u626b\u63cf\u3002<\/li>\n<li>\u867d\u8bf4\u662f\u4ece\u5934\u5f00\u59cb\u626b\u63cf\u7684\uff0c\u4f46\u662f\u8981\u60f3\u8df3\u51fa\u904d\u5386\uff0c\u9700\u8981\u6ee1\u8db3\u4e00\u5b9a\u7684\u6761\u4ef6\u3002\u5728\u8df3\u51fa\u904d\u5386\u4e4b\u524d\uff0c\u6700\u540e\u4e00\u6b21\u8bbe\u7f6e\u7684logPosition\u624d\u662f\u6211\u4eec\u8981\u62db\u7684logPosition\u3002<\/li>\n<li>\u5982\u679c\u662f\u4e00\u4e2a\u4e8b\u52a1\u63d0\u4ea4\u7684\u4e8b\u4ef6\uff0c\u6211\u4eec\u8981\u627e\u7684position\u5c31\u662f\u8fd9\u4e2a\u4e8b\u4ef6\u7684position+event.length\u3002\u5982\u679c\u662f\u4e8b\u52a1\u5f00\u59cb\uff0cposition\u5c31\u662f\u5f53\u524d\u4e8b\u4ef6\u7684position\u3002\u5176\u4ed6\u7684\u4e8b\u4ef6\u90fd\u5ffd\u7565\u3002<\/li>\n<\/ul>\n<p>\u81f3\u6b64\uff0c\u6211\u4eec\u5df2\u7ecf\u627e\u5230\u4e86\u6211\u4eec\u60f3\u8981\u7684binlog\u6587\u4ef6\u540d\u548c\u5bf9\u5e94\u7684\u4e8b\u52a1\u5f00\u59cbposition\uff0c\u6211\u4eec\u7ee7\u7eed\u4e0b\u9762\u7684\u6b65\u9aa4\u5373\u53ef\u3002<\/p>\n<h2 id=\"\u4e8ceventstore\">\u4e8c\u3001EventStore<\/h2>\n<p>\u8fd9\u5757\u5185\u5bb9\u7684\u4e3b\u8981\u601d\u60f3\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\u7ef4\u62a4\u4e00\u4e2a\u7c7b\u4f3c\u4e8eDisruptor\u7684RingBuffer\uff0c\u540c\u65f6\u7ef4\u62a4\u4e09\u4e2a\u5e8f\u5217\uff0cput\/get\/ack\u3002<\/li>\n<li>EventSink\u4e4b\u540e\u7684\u6570\u636e\uff0c\u8c03\u7528put\u63a5\u53e3\uff0c\u5c06\u6570\u636e\u653e\u5165\u73af\u5f62\u961f\u5217\u4e2d\u3002<\/li>\n<li>Canal client\u83b7\u53d6\u6570\u636e\uff0c\u8c03\u7528get\u65b9\u6cd5\u3002<\/li>\n<li>\u5f02\u6b65\u8c03\u7528ack\u65b9\u6cd5\uff0c\u6e05\u9664ack\u4e4b\u524d\u7684\u6570\u636e\u3002<\/li>\n<li>\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u8fd9\u5757get\u548cack\u91c7\u7528\u4e86\u6d41\u5f0fAPI\u7684\u6a21\u5f0f\uff0cget\u548cack\u5f02\u6b65\u8fdb\u884c\uff0c\u53ef\u4ee5\u5148get\uff0c\u7136\u540e\u5f02\u6b65\u8c03\u7528ack\u3002<\/li>\n<li>ack\u662f\u6709\u5e8f\u7684\uff0c\u4e0d\u5141\u8bb8\u8df3\u8dc3\u5f0f\u7684\u63d0\u4ea4\u3002<\/li>\n<\/ul>\n<h2 id=\"\u4e09binlog\u7684row\u6a21\u5f0f\">\u4e09\u3001Binlog\u7684Row\u6a21\u5f0f<\/h2>\n<p>\u81f3\u6b64\uff0c\u6211\u4eec\u57fa\u672c\u4e0a\u77e5\u9053\u4e86canal\u662f\u5982\u4f55\u5728\u53d1\u751f\u6570\u636e\u5e93\u4e3b\u4ece\u5207\u6362\u65f6\u4fdd\u8bc1\u9ad8\u53ef\u7528\u548c\u9ad8\u53ef\u9760\u7684\uff0c\u6211\u4eec\u53ef\u80fd\u8fd8\u6709\u7591\u60d1\uff1a\u4e3a\u4ec0\u4e48\u8981\u56de\u900060s\uff0c\u6765\u89e3\u6790binlog\uff0c\u8fd9\u6837\u4e0d\u4f1a\u5bfc\u81f4\u6570\u636e\u91cd\u590d\u5417\uff1f\u8fd8\u6709\u4e00\u4e9b\u81ea\u589e\u7684update\u8bed\u53e5\uff08\u4e0d\u5177\u5907\u5e42\u7b49\u6027\uff09\uff0c\u4e0d\u4f1a\u4ea7\u751f\u6570\u636e\u9519\u8bef\u5417\uff1f\u8981\u60f3\u56de\u7b54\u8fd9\u4e9b\u95ee\u9898\uff0c\u5c31\u9700\u8981\u6211\u4eec\u4e86\u89e3Binlog\u7684Row\u6a21\u5f0f\u4e86\u3002<\/p>\n<p>Mysql 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