{"id":3397,"date":"2011-12-20T23:51:20","date_gmt":"2011-12-20T15:51:20","guid":{"rendered":"http:\/\/www.orczhou.com\/?p=3397"},"modified":"2011-12-20T23:51:20","modified_gmt":"2011-12-20T15:51:20","slug":"time-to-group-commit-2","status":"publish","type":"post","link":"https:\/\/www.orczhou.com\/index.php\/2011\/12\/time-to-group-commit-2\/","title":{"rendered":"MySQL\/InnoDB\u548cGroup Commit(2)"},"content":{"rendered":"

\u4eca\u5929\u53d1\u73b0Percona Release\u7684Percona-Server-5-5-18-23-0<\/a>\u5df2\u7ecf\u5b8c\u6210\u4e86Group Commit\u5de5\u4f5c\uff0c\u800c\u4e14\u662f\u7528\u6700\u4f18\u96c5\u7684\u65b9\u5f0f\uff08\u79fb\u690d\u4e86MariaDB\u7684\u5b9e\u73b0\uff0c\u800c\u4e0d\u662fworkaround\uff09\uff0c\u5fc3\u91cc\u96be\u63a9\u6fc0\u52a8\u3002<\/p>\n

\u8fd9\u7bc7\u6587\u7ae0\u63a5\u524d\u7bc7<\/a>\u7ee7\u7eed\u4ecb\u7ecd\u4e00\u4e0b\u95ee\u9898\u7684\u80cc\u666f\uff1a\u4ec0\u4e48\u662fGroup Commit\uff0c\u73b0\u5728\u7684\u5b98\u65b9\u7248\u672cGroup Commit\u505a\u5230\u4e86\u4ec0\u4e48\u7a0b\u5ea6\uff1f<\/p>\n

1. \u4ec0\u4e48\u662fGroup Commit<\/div>\n

MySQL\/InnoDB\u5728\u505a\u4e8b\u52a1\u7684\u65f6\u5019\u4f7f\u7528\u7684\u65e5\u5fd7\u5148\u884c\uff08Write-ahead logging<\/a>\uff09\u7684\u65b9\u5f0f\u4fdd\u8bc1\u4e8b\u52a1\u7684\u5feb\u901f\u548c\u6301\u4e45\uff0c\u6240\u4ee5\u6bcf\u6b21\u4e8b\u52a1\u5b8c\u6210\u90fd\u8981\u6c42\u65e5\u5fd7\u5fc5\u987b\u6301\u4e45\u5316\u5230\u78c1\u76d8\uff0c\u5728Linux\u4e0a\u5bf9\u5e94\u7684\u64cd\u4f5c\u5c31\u662f\u201cwrite and fsync<\/a>\u201d\uff0cwrite\u901f\u5ea6\u662f\u5f88\u5feb\u7684\uff0c\u4e00\u822c\u5bf9\u5e94\u7684\u5199Page Cache\uff0c\u800cfsync\u5219\u8981\u6c42\u6587\u4ef6\u7cfb\u7edf\u628a\u5bf9\u5e94\u6587\u4ef6\u7684\u54e6Page Cache\u5fc5\u987b\u6301\u4e45\u5316\u5230\u78c1\u76d8\u4e0a\uff0c\u800c\u5bf9\u4e8e\u4f20\u7edf\u78c1\u76d8\u4e00\u6b21\u5199\u64cd\u4f5c\u5927\u7ea6\u9700\u89811~3ms\uff08\u4e0d\u8bf4BBU\uff09\uff0c\u8fd9\u610f\u5473\u7740\u5bf9\u4e8e\u4f20\u7edf\u78c1\u76d81\u79d2\u949f\u6700\u591a\u6700\u591a\u505a333\uff5e1000\u4e2a\u4e8b\u52a1\uff0c\u8fd9\u662f\u4e0d\u7406\u60f3\u7684\uff0c\u5bf9\u786c\u4ef6\u7684\u5229\u7528\u7387\uff08\u541e\u5410\u91cf\uff09\u4e5f\u662f\u975e\u5e38\u4f4e\u3002<\/p>\n

\u6240\u4ee5\uff0c\u8fd9\u91cc\u5c31\u6709\u4e86Group\u64cd\u4f5c\u7684\u6982\u5ff5\uff0c\u5373\u5f53\u597d\u51e0\u4e2a\u7ebf\u7a0b\u90fd\u8981fsync\u540c\u4e00\u4e2a\u65e5\u5fd7\u6587\u4ef6\u65f6\uff0c\u6211\u4eec\u5c06\u8fd9\u4e9bfsync\u5408\u5e76\u5230\u4e00\u6b21\u6765\u505a\u3002\u7b80\u5355\u4e3e\u4f8b\uff1a\u6211\u4eec\u8ba9\u7cfb\u7edf\u6bcf2ms\u505a\u4e00\u6b21fsync\uff0c\u8fd9\u6837\u5982\u679c\u8fd92ms\u5185\u6709100\u4e2a\u7ebf\u7a0b\u90fd\u9700\u8981\u505afsync\uff0c\u90a3\u5c31\u8d5a\u5230\u4e86\uff0c\u539f\u672c100\u4e2afsync\u90fd\u72ec\u7acb\u6765\u505a\u90a3\u8017\u65f6\u4f1a\u975e\u5e38\u591a\u7684\u3002<\/p>\n

\u4f60\u80af\u5b9a\u4f1a\u8bf4\uff0c\u96be\u9053\u8fd9\u4e0d\u662f\u5f88\u7b80\u5355\u7684\u60f3\u6cd5\u5417\uff1f\u662f\u7684\uff0c\u8fd9\u5c31\u662f\u539f\u672c\u662f\u5f88\u7b80\u5355\u3001\u4e5f\u5f88\u81ea\u7136\u7684\u60f3\u6cd5\u3002<\/p>\n

\u4f46\u5bf9MySQL\u6765\u8bf4\u5374\u53d8\u6210\u4e86\u4e00\u79cd\u5962\u6c42\uff08\u770b\u770b\u8fd9\u4e2aBug\u8ba8\u8bba<\/a>\uff09\u3002<\/p>\n

2. \u4e3a\u5565MySQL\u4e00\u76f4\u6ca1\u6709\u5b9e\u73b0\uff1f<\/div>\n

MySQL\u662f\u4e0d\u662f\u592a\u5f31\u4e86\uff0c\u8fd9\u4e48\u7b80\u5355\u7684\u4e8b\u60c5\u90fd\u641e\u4e0d\u5b9a\uff1f\u4e0d\u662f\u7684\u3002<\/p>\n

MySQL\u4ece\u5f00\u6e90\u5230\u73b0\u5728\uff0c\u6210\u529f\u7684\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u539f\u56e0\uff0c\u5c31\u662fMySQL\u7684\u63d2\u4ef6\u5f0f\u67b6\u6784\u3002\u5982\u679cMySQL\u53ea\u662fMyISAM\u4f30\u8ba1\u4e0d\u4f1a\u6709\u73b0\u5728\u7684\u6d41\u884c\u7a0b\u5ea6\uff0c\u63d2\u4ef6\u5f0f\u7684\u67b6\u6784\u8ba9\u8bf8\u5982Heikki Tuuri\u6709\u4e86\u53d1\u6325\u7a7a\u95f4\uff0c\u5728InnoDB\u548cMySQL\u4e00\u8d77\u65f6\uff0cMySQL\u624d\u80fd\u7b97\u662f\u4e00\u4e2a\u771f\u6b63\u7684DBMS\u3002\u518d\u5230\u540e\u6765\uff0c\u6709Infobright\u3001 FEDERATED\u3001PBXT\u7b49\u7b49\u3002<\/p>\n

\u63d2\u4ef6\u5f0f\u7684\u67b6\u6784\u7ed9MySQL\u5e26\u6765\u4e86\u6d3b\u529b\uff0c\u505a\u51fa\u727a\u7272\u4fbf\u662f\u5728\u4e0a\u5c42(MySQL)\u548c\u4e0b\u5c42(\u5b58\u50a8\u5f15\u64ce)\u4ea4\u4e92\u65f6\u5e26\u6765\u7684\u989d\u5916\u6d88\u8017\uff0c\u6709\u65f6\u751a\u81f3\u4e0a\u5c42\u548c\u4e0b\u5c42\u9700\u8981\u505a\u4e00\u4e9b\u91cd\u590d\u5de5\u4f5c\u3002\u65e0\u6cd5\u505aGroup Commit\u5c31\u662f\u8fd9\u5176\u4e2d\u7684\u727a\u7272\u4e4b\u4e00\u3002<\/p>\n

<\/p>\n

3. \u73b0\u5728\u7684\u5b98\u65b9\u7248\u672cGroup Commit\u505a\u5230\u4e86\u4ec0\u4e48\u7a0b\u5ea6<\/div>\n

InnoDB\u5728\u4e00\u6b21\u4e8b\u52a1\u4e2d\uff0c\u6709\u4e24\u6b21fsync\uff0c\u5206\u522b\u662fprepare\u9636\u6bb5\u548ccommit\u9636\u6bb5\uff0c\u5bf9\u4e8e\u8fd9\u4e24\u6b21\u64cd\u4f5cInnoDB\u90fd\u662f\u5b9e\u73b0\u4e86Group\u64cd\u4f5c<\/a>\u7684\u3002<\/p>\n

\u5982\u679c\u4f60\u8bbe\u7f6e\u4e86binlog_sync=1\uff0c\u5219\u53c8\u591a\u4e86\u4e00\u6b21fsync\u64cd\u4f5c\uff08\u53c2\u8003MYSQL_BIN_LOG::flush_and_sync\uff09\uff0c\u8fd9\u6b21\u64cd\u4f5c\u5728innobase_xa_prepare\u548cinnodb_commit\u4e4b\u95f4\uff1a<\/p>\n

binlog_prepare (do nothing)
\ninnodb_prepare
\n…
\nbinlog_commit
\ninnobase_commit<\/p><\/blockquote>\n

\u8fd9\u6b21fsync\uff0c\u5728MySQL\u4e2d\u4e00\u76f4\u90fd\u65e0\u6cd5\u505aGroup<\/strong>\u3002\u6240\u4ee5\uff0c\u4e00\u76f4\u4ee5\u6765\u5f53innodb_flush_log_at_trx_commit\u548cbinlog_sync\u90fd\u7b49\u4e8e1\u7684\u65f6\u5019\uff0cMySQL\u7684\u6027\u80fd\u5c31\u975e\u5e38\u3001\u975e\u5e38\u7cdf\u7cd5<\/a>\u3002\u539f\u56e0\u662f\u4e3a\u4e86\u4fdd\u8bc1InnoDB\u5185\u90e8Commit<\/strong>\u7684\u987a\u5e8f\u548cMySQL\u65e5\u5fd7\u7684\u987a\u5e8f\u4e00\u81f4\uff08\u53c2\u8003<\/a>\uff09\u3002<\/p>\n

4. \u5f00\u6e90\u793e\u533a\u7684\u52aa\u529b<\/div>\n

\u96be\u9053\u6ca1\u4eba\u53bb\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u5417\uff1f\u4e0d\u662f\u7684\u3002\u6709\u5f88\u591a\u4eba\u5df2\u7ecf\u505a\u51fa\u4e86\u52aa\u529b\uff0c\u76f4\u5230Kristian Nielsen@MariaDB\u63d0\u51fa\u4e86\u7406\u8bba\u548c\u5b9e\u9645\u4e0a\u7684\u6700\u4f18\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n

Mark Callaghan@Facebook\u5173\u4e8eGroup Commit\u505a\u7684\u5de5\u4f5c\uff1aFB\u7684\u57fa\u672c\u5b9e\u73b0<\/a> | FB\u7684\u95ee\u9898\u548c\u6539\u8fdb<\/a> | \u6027\u80fd<\/a> | \u5bf9\u6bd4MariaDB\u7684\u5b9e\u73b0<\/a>(\u5bf9\u6bd4\u7684\u7ed3\u679c\u662fMariaDB\u5b8c\u80dc\uff0c\u65e0\u8bba\u662f\u65b9\u6848\u67b6\u6784\u8fd8\u662f\u6027\u80fd)<\/p>\n

Facebooke\u53ef\u4ee5\u8bf4\u662f\u901a\u8fc7\u4e00\u4e2aTrick<\/a>\u5feb\u901f\u5b9e\u73b0\u4e86Group Commit\u3002\u800cKristian Nielsen@MariaDB\u8fd9\u662f\u4ece\u67b6\u6784\u4e0a\u6839\u672c\u7684\u89e3\u51b3\u4e86\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n

MariaDB\u5173\u4e8eGroup Commit\u67b6\u6784\u548c\u5b9e\u73b0\uff1a WL116<\/a> | WL132<\/a> | WL164<\/a><\/p>\n

5. \u672a\u5b8c\u5f85\u7eed<\/div>\n

\u540e\u9762\u8fd8\u6709\u5f88\u591a\u503c\u5f97\u5199\u7684\uff0c\u6211\u5e0c\u671b\u81ea\u5df1\u80fd\u591f\u4e00\u76f4\u5199\u5b8c\u8fd9\u4e2a\u7cfb\u5217\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u4eca\u5929\u53d1\u73b0Percona Release\u7684Percona-Server-5-5-18-23-0\u5df2\u7ecf\u5b8c\u6210\u4e86Group Commit\u5de5\u4f5c\uff0c\u800c\u4e14\u662f\u7528\u6700\u4f18\u96c5\u7684\u65b9\u5f0f\uff08\u79fb\u690d\u4e86MariaDB\u7684\u5b9e\u73b0\uff0c\u800c\u4e0d\u662fworkaround\uff09\uff0c\u5fc3\u91cc\u96be\u63a9\u6fc0\u52a8\u3002 \u8fd9\u7bc7\u6587\u7ae0\u63a5\u524d\u7bc7\u7ee7\u7eed\u4ecb\u7ecd\u4e00\u4e0b\u95ee\u9898\u7684\u80cc\u666f\uff1a\u4ec0\u4e48\u662fGroup Commit\uff0c\u73b0\u5728\u7684\u5b98\u65b9\u7248\u672cGroup Commit\u505a\u5230\u4e86\u4ec0\u4e48\u7a0b\u5ea6\uff1f 1. \u4ec0\u4e48\u662fGroup Commit MySQL\/InnoDB\u5728\u505a\u4e8b\u52a1\u7684\u65f6\u5019\u4f7f\u7528\u7684\u65e5\u5fd7\u5148\u884c\uff08Write-ahead logging\uff09\u7684\u65b9\u5f0f\u4fdd\u8bc1\u4e8b\u52a1\u7684\u5feb\u901f\u548c\u6301\u4e45\uff0c\u6240\u4ee5\u6bcf\u6b21\u4e8b\u52a1\u5b8c\u6210\u90fd\u8981\u6c42\u65e5\u5fd7\u5fc5\u987b\u6301\u4e45\u5316\u5230\u78c1\u76d8\uff0c\u5728Linux\u4e0a\u5bf9\u5e94\u7684\u64cd\u4f5c\u5c31\u662f\u201cwrite and fsync\u201d\uff0cwrite\u901f\u5ea6\u662f\u5f88\u5feb\u7684\uff0c\u4e00\u822c\u5bf9\u5e94\u7684\u5199Page Cache\uff0c\u800cfsync\u5219\u8981\u6c42\u6587\u4ef6\u7cfb\u7edf\u628a\u5bf9\u5e94\u6587\u4ef6\u7684\u54e6Page Cache\u5fc5\u987b\u6301\u4e45\u5316\u5230\u78c1\u76d8\u4e0a\uff0c\u800c\u5bf9\u4e8e\u4f20\u7edf\u78c1\u76d8\u4e00\u6b21\u5199\u64cd\u4f5c\u5927\u7ea6\u9700\u89811~3ms\uff08\u4e0d\u8bf4BBU\uff09\uff0c\u8fd9\u610f\u5473\u7740\u5bf9\u4e8e\u4f20\u7edf\u78c1\u76d81\u79d2\u949f\u6700\u591a\u6700\u591a\u505a333\uff5e1000\u4e2a\u4e8b\u52a1\uff0c\u8fd9\u662f\u4e0d\u7406\u60f3\u7684\uff0c\u5bf9\u786c\u4ef6\u7684\u5229\u7528\u7387\uff08\u541e\u5410\u91cf\uff09\u4e5f\u662f\u975e\u5e38\u4f4e\u3002 \u6240\u4ee5\uff0c\u8fd9\u91cc\u5c31\u6709\u4e86Group\u64cd\u4f5c\u7684\u6982\u5ff5\uff0c\u5373\u5f53\u597d\u51e0\u4e2a\u7ebf\u7a0b\u90fd\u8981fsync\u540c\u4e00\u4e2a\u65e5\u5fd7\u6587\u4ef6\u65f6\uff0c\u6211\u4eec\u5c06\u8fd9\u4e9bfsync\u5408\u5e76\u5230\u4e00\u6b21\u6765\u505a\u3002\u7b80\u5355\u4e3e\u4f8b\uff1a\u6211\u4eec\u8ba9\u7cfb\u7edf\u6bcf2ms\u505a\u4e00\u6b21fsync\uff0c\u8fd9\u6837\u5982\u679c\u8fd92ms\u5185\u6709100\u4e2a\u7ebf\u7a0b\u90fd\u9700\u8981\u505afsync\uff0c\u90a3\u5c31\u8d5a\u5230\u4e86\uff0c\u539f\u672c100\u4e2afsync\u90fd\u72ec\u7acb\u6765\u505a\u90a3\u8017\u65f6\u4f1a\u975e\u5e38\u591a\u7684\u3002 \u4f60\u80af\u5b9a\u4f1a\u8bf4\uff0c\u96be\u9053\u8fd9\u4e0d\u662f\u5f88\u7b80\u5355\u7684\u60f3\u6cd5\u5417\uff1f\u662f\u7684\uff0c\u8fd9\u5c31\u662f\u539f\u672c\u662f\u5f88\u7b80\u5355\u3001\u4e5f\u5f88\u81ea\u7136\u7684\u60f3\u6cd5\u3002 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