{"id":515,"date":"2014-02-10T18:06:15","date_gmt":"2014-02-10T10:06:15","guid":{"rendered":"http:\/\/www.gpfeng.com\/?p=515"},"modified":"2014-02-11T13:08:51","modified_gmt":"2014-02-11T05:08:51","slug":"mysql-semi-sync-%e5%8e%9f%e7%90%86%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"http:\/\/www.gpfeng.com\/?p=515","title":{"rendered":"MySQL semi-sync \u5b9e\u73b0\u539f\u7406\u5206\u6790"},"content":{"rendered":"<p>\u672c\u6587\u5206\u6790\u57fa\u4e8eOracle MySQL 5.6.15\u7248\u672c\u6e90\u7801\uff0c\u662f\u5728\u9605\u8bfbMySQL\u6e90\u7801\u4ee5\u53ca<a href=\"http:\/\/mysqllover.com\/?p=799\">\u5370\u98ce\u535a\u5ba2<\/a>\u57fa\u7840\u4e0a\u603b\u7ed3\u7684\uff0c\u4f5c\u4e3a\u65b0\u5e74\u7684\u7b2c\u4e00\u7bc7\u535a\u6587\uff0c\u603b\u7ed3\u53bb\u5e74\u5e95\u7684\u4e00\u70b9\u5b66\u4e60\u6240\u5f97\uff0c\u5c06\u91cd\u70b9\u603b\u7ed3\u4ee5\u4e0b\u5185\u5bb9\uff1a<br \/>\n1). binlog group commit<br \/>\n2). semi-sync replication<\/p>\n<h3>binlog group commit<\/h3>\n<p>\u8fd9\u662f\u4e00\u4e2a\u5f88\u53e4\u8001\u7684\u95ee\u9898\uff0c\u7b80\u5355\u5570\u55e6\u4e00\u4e0b\uff1a\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u5b89\u5168\uff0c\u4e8b\u52a1\u63d0\u4ea4\u65f6\u9700\u8981\u5c06binlog\u5237\u76d8\uff0c\u8fd9\u4e2a\u5176\u5b9e\u662f\u5206\u4e3a2\u6b69\u6765\u505a\u7684\uff0cwrite\u548cfsync\uff0c\u5176\u4e2d\u7b2c\u4e8c\u6b65\u4fdd\u8bc1\u6570\u636e\u6301\u4e45\u5316\uff0c\u975e\u5e38\u8017\u65f6\uff0c\u4f1a\u6210\u4e3a\u6027\u80fd\u74f6\u9888\uff0c\u5982\u679c\u6bcf\u63d0\u4ea4\u4e00\u4e2a\u4e8b\u52a1\u90fd\u505a\u4e00\u6b21fsync\uff0c\u7cfb\u7edfTPS\u5c06\u4f1a\u5927\u5927\u964d\u4f4e\uff0c\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u9700\u8981\u51cf\u5c11fsyn\u8c03\u7528\u7684\u6b21\u6570\uff0c\u539f\u7406\uff1a\u6d3b\u8dc3\u7cfb\u7edf\u4e2d\uff0c\u5728\u4e00\u4e2a\u7ebf\u7a0b\u505afsync\u65f6\uff0c\u5176\u5b83\u7ebf\u7a0b\u5c06\u7b49\u5f85\uff0c\u7b49\u5f85\u8fc7\u7a0b\u4e2d\u4ece\u8fd9\u4e9b\u7ebf\u7a0b\u4e2d\u9009\u51fa\u4e00\u4e2aleader\uff08\u8fdb\u5165\u7b49\u5f85\u7684\u7b2c\u4e00\u4e2a\u7ebf\u7a0b\uff09\uff0c\u5176\u5b83\u7ebf\u7a0b\u7531leader\u4ee3\u4e3a\u5b8c\u6210write+fync\uff0cleader\u5b8c\u6210\u5de5\u4f5c\u540e\u901a\u77e5\u6240\u6709\u7b49\u5f85\u7684\u7ebf\u7a0b\u7ee7\u7eed\u8fd0\u884c<br \/>\n<!--more--><br \/>\n\u5728Percona server 5.5.18\u4ee3\u7801\u4e2d\uff0cbinlog group commit\u5206\u4e3a\u4e24\u4e2a\u9636\u6bb5\uff1aflush\/commit\uff0c\u4ee3\u7801\u5b9e\u73b0\u57fa\u672c\u4e0e\u4e0a\u8ff0\u63cf\u8ff0\u4e00\u81f4\uff0c\u5728Oracle MySQL 5.6.15\u4e2d\uff0cbinlog group commit\u6a21\u5757\u88ab\u91cd\u5199\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u5206\u4e3a3\u4e2astage\uff1aflush\/sync\/commit\uff0c\u672c\u6587\u4e0d\u6253\u7b97\u5bf9\u8fd9\u90e8\u5206\u8be6\u7ec6\u5206\u6790\uff0c\u53ea\u4ecb\u7ecd\u4e00\u4e0b\u533a\u522b\uff1a<br \/>\n1). 5.5\u4e2d\u53ea\u6709\u4e24\u4e2a\u9636\u6bb5\uff0cleader\u7ebf\u7a0bwrite+sync\u505a\u5b8c\u540e\u624d\u901a\u53eadump\u7ebf\u7a0b\u590d\u5236binlog\u5230\u5907\u5e93\uff0c5.6\u4e2d\u5728write\u505a\u5b8c\u540efsync\u4e4b\u524d\u901a\u8fc7dump\u7ebf\u7a0b\uff0c\u63d0\u524d\u4e86\u5f00\u59cb\u590d\u5236binlog\u5230\u5907\u5e93\u7684\u65f6\u95f4<br \/>\n2). 5.6\u4e2d\u5f15\u5165\u4e86Stage_manager\uff0c\u4ee3\u7801\u903b\u8f91\u66f4\u52a0\u6e05\u6670<br \/>\n3). 5.6\u4e2d\u6bcf\u4e2a\u9636\u6bb5\u90fd\u53ef\u4ee5group\uff0c\u7406\u8bba\u4e0a\u6027\u80fd\u66f4\u597d<\/p>\n<p>\u5173\u4e8ebinlog group commit\u7684\u4ecb\u7ecd\u5c31\u5230\u8fd9\u91cc\uff0c\u8fdb\u5165\u672c\u6587\u91cd\u70b9\u90e8\u5206<\/p>\n<h3>semi-sync replication<\/h3>\n<p>semi-sync\u5728MySQL\u4e2d\u662f\u4ee5plugin\u65b9\u5f0f\u5b9e\u73b0\u7684\uff0c\u5982\u679c\u4ece\u8f6f\u4ef6\u8bbe\u8ba1\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u662f\u4e00\u4e2a\u6807\u51c6\u7684Observer\u6a21\u5f0f\uff0c\u5728\u4ee3\u7801\u6267\u884c\u5230\u67d0\u4e9b\u5173\u952e\u4f4d\u7f6e\u65f6\u901a\u77e5\u76f8\u5173Observer\uff0c\u901a\u8fc7RUN_HOOK\u5b8f\u8c03\u7528\u6ce8\u518c\u5230\u67d0\u7c7bObserver\u4e2d\u7684\u6240\u6709plugin\u7684\u76f8\u5e94\u51fd\u6570\uff0cMySQL\u4e2d\u6709\u56db\u7c7b\u8fd9\u6837\u7684Observer\uff0c\u4e0esemi-sync\u76f8\u5173\u7684\u51fd\u6570\u8c03\u7528\u903b\u8f91\u603b\u7ed3\u5982\u4e0b\uff08\u6bcf\u4e2a\u51fd\u6570\u7684\u5b9e\u73b0\u7ec6\u8282\u8bf7\u53c2\u8003<a href=\"http:\/\/mysqllover.com\/?p=799\">\u5370\u98ce\u535a\u5ba2<\/a>\uff09\uff1a<\/p>\n<p><strong>Trans_observer<\/strong>: \u76d1\u542c\u4e8b\u52a1commit\/rollback<\/p>\n<pre lang=\"c\">\r\nafter_commit--> repl_semi_report_commit--> ReplSemiSyncMaster::commitTrx --> cond_timewait\r\nafter_rollback --> repl_semi_report_rollback --> ReplSemiSyncMaster::commitTrx --> cond_timewait\r\n<\/pre>\n<p><strong>Binlog_storage_observer<\/strong>\uff1a\u76d1\u542cbinlog flush\/fync\u52a8\u4f5c<\/p>\n<pre lang=\"c\">\r\nafter_flush --> repl_semi_report_binlog_update --> repl_semisync.writeTranxInBinlog --> (active_tranxs_->insert_tranx_node)\r\nafter_sync --> repl_semi_report_binlog_sync --> ReplSemiSyncMaster::commitTrx --> cond_timewait\r\n<\/pre>\n<p><strong>Binlog_transmit_observer<\/strong>\uff1a\u76d1\u542cdump\u7ebf\u7a0b\u53d1\u9001binlog\u7684\u8fc7\u7a0b<\/p>\n<pre lang=\"c\">\r\nstart --> repl_semi_binlog_dump_start --> repl_semisync.add_slave\r\nstop --> repl_semi_binlog_dump_end --> repl_semisync.remove_slave\r\nreserve_header --> repl_semi_reserve_header --> repl_semisync.reserveSyncHeader\r\nbefore_send_event --> repl_semi_before_send_event --> repl_semisync.updateSyncHeader\r\nafter_send_event --> repl_semi_after_send_event --> repl_semisync.readSlaveReply --> ReplSemiSyncMaster.reportReplyBinlog --> cond_broadcast\r\nbefore_reset_master --> repl_semi_before_reset_master --> repl_semisync.beforeResetMaster\r\nafter_reset_master --> repl_semi_reset_master --> repl_semisync.resetMaster\r\n<\/pre>\n<p><strong>Binlog_relay_IO_observer<\/strong>\uff1a\u76d1\u542cslave IO\u7ebf\u7a0b\u63a5\u6536binlog\u7684\u8fc7\u7a0b<\/p>\n<pre lang=\"c\">\r\nstart --> repl_semi_slave_io_start --> repl_semisync.slaveStart\r\nstop --> repl_semi_slave_io_end --> repl_semisync.stopStart\r\nrequest_transmit --> repl_semi_slave_request_dump\r\nafter_read_event --> repl_semi_slave_read_event\r\nafter_queue_event --> repl_semi_slave_queue_event\r\nreset --> repl_semi_reset_slave\r\n<\/pre>\n<p>semi-sync\u7684\u5b9e\u73b0\u9700\u8981\u4e0e\u4e09\u7c7b\u7ebf\u7a0b\u4ea4\u4e92\uff0c\u4e0b\u9762\u8be6\u7ec6\u5206\u6790<\/p>\n<h4>\u7528\u6237\u7ebf\u7a0b<\/h4>\n<p>\u63d0\u4ea4\u4e8b\u52a1\u65f6\u9700\u8981\u5199binlog\uff0c\u5728group commit\u7684\u7b2c\u4e00\u4e2a\u9636\u6bb5\uff08flush\uff09\u5b8c\u6210\u540e\uff0c\u7528\u6237\u7ebf\u7a0b\u901a\u77e5binlog dump\u7ebf\u7a0b\u590d\u5236binlog\u5230\u6240\u6709\u7684\u5907\u5e93\uff0c\u4e4b\u540e\u7ee7\u7eed\u6267\u884csync\/commit\u9636\u6bb5\uff0c\u7b49\u5f85\u6536\u5230\u5907\u5e93ack(\u6216\u8005\u786e\u8ba4\u5907\u5e93\u5df2\u6536\u5230\u66f4\u5927\u7684\u7684ack)\u540e\u8fd4\u56de\u7528\u6237\uff0c\u7b49\u5f85ack\u65f6\u53ea\u9700\u8981\u786e\u8ba4\u6709\u4e00\u4e2aslave\u6536\u5230binlog\u5373\u53ef<\/p>\n<pre lang=\"c\">\r\n\r\nMYSQL_BIN_LOG::ordered_commit\r\n\/\/ \u8fdb\u5165flush\u9636\u6bb5\r\n|--> change_stage(thd, Stage_manager::FLUSH_STAGE, thd, NULL, &LOCK_log)\r\n|--> if follower \r\n   |--> MYSQL_BIN_LOG::finish_commit \r\n   |--> RUN_HOOK(transaction, after_commit, (head, all))\r\n   |--> RETURN\r\n\r\n|--> process_flush_stage_queue\r\n\/\/ \u6267\u884cwrite\u64cd\u4f5c\r\n|--> flush_cache_to_file\r\n\r\n\/\/ \u6dfb\u52a0\u5230\u6d3b\u8dc3\u4e8b\u52a1\u94fe\u8868\u4e2d\r\n|--> RUN_HOOK(binlog_storage, after_flush, (thd, file_name_ptr, flush_end_pos))\r\n\r\n\/\/ \u901a\u77e5\u6240\u6709binglog dump\u7ebf\u7a0b\u590d\u5236binlog\u5230\u5907\u5e93\r\n|--> signal_update\r\n\r\n\/\/ \u6267\u884cfsync\u5c06\u6570\u636e\u5237\u76d8\r\n|--> sync_binlog_file\r\n\r\n\/\/ \u8fdb\u5165sync\u9636\u6bb5\r\n|--> change_stage(thd, Stage_manager::SYNC_STAGE, wait_queue, &LOCK_log, &LOCK_sync)\r\n|--> if follower \r\n   |--> MYSQL_BIN_LOG::finish_commit \r\n   |--> RUN_HOOK(transaction, after_commit, (head, all))\r\n   |--> RETURN\r\n\r\n\/\/ \u8fdb\u5165commit\u9636\u6bb5\r\n|--> change_stage(thd, Stage_manager::COMMIT_STAGE, final_queue, &LOCK_sync, &LOCK_commit)\r\n|--> if follower \r\n   |--> MYSQL_BIN_LOG::finish_commit \r\n      |--> RUN_HOOK(transaction, after_commit, (head, all))\r\n   |--> RETURN\r\n\r\nprocess_after_commit_stage_queue --> RUN_HOOK(transaction, after_commit, (head, all))\r\n\r\n|--> MYSQL_BIN_LOG::finish_commit \r\n   \/\/ \u7b49\u5f85\u5907\u5e93ack\u6536\u5230\r\n   |--> RUN_HOOK(transaction, after_commit, (head, all))\r\n\r\n<\/pre>\n<h4>binlog dump\u7ebf\u7a0b<\/h4>\n<p>binglog dump\u7ebf\u7a0b\u5728\u4e00\u4e2awhile\u5faa\u73af\u4e2d\u53d1\u9001binlog\u5230\u4e00\u4e2a\u5907\u5e93\uff0c\u53d1\u9001\u4e4b\u524d\u5728binlog event\u5934\u90e8\u5199\u5165semi-sync\u76f8\u5173\u4fe1\u606f\uff083\u4e2a\u5b57\u8282\uff09\uff0c\u51b3\u5b9a\u662f\u5426\u9700\u8981\u5907\u5e93\u56de\u590dack\uff0c\u6570\u636e\u53d1\u9001\u5230\u5907\u5e93\u540e\u7b49\u5f85\u76f8\u5e94\u7684ack\uff08\u5305\u62ecbinlog\u6587\u4ef6\u540d\u548cpos\uff09<\/p>\n<pre lang=\"c\">\r\nmysql_binlog_send\r\n\r\n\/\/ \u521d\u59cb\u5316semi-sync\r\n|--> RUN_HOOK(binlog_transmit, transmit_start, (thd, flags, log_ident, pos))\r\n\r\nwhile loop\r\n|--> mysql_bin_log.wait_for_update_bin_log(thd, heartbeat_ts)\r\n|--> reset_transmit_packet --> RUN_HOOK(binlog_transmit, reserve_header, (thd, flags, packet))\r\n\/\/ \u8bbe\u7f6ebinlog\u5934\u90e8\uff0c\u8981\u6c42\u5907\u5e93ack\r\n|--> RUN_HOOK(binlog_transmit, before_send_event, (thd, flags, packet, log_file_name, pos))\r\n\/\/ \u53d1\u9001binlog\u5230\u5907\u5e93\r\n... my_net_write(net, (uchar*) packet->ptr(), packet->length())\r\n\/\/ \u7b49\u5f85\u8bfb\u53d6\u5907\u5e93ack\uff0c\u5524\u9192\u7b49\u5f85ack\u7684\u7528\u6237\u7ebf\u7a0b\uff0c\u4ece\u6d3b\u8dc3\u4e8b\u52a1\u94fe\u8868\u4e2d\u6e05\u9664\r\n|--> RUN_HOOK(binlog_transmit, after_send_event, (thd, flags, packet))\r\nend while\r\n\r\n\/\/ dump\u505c\u6b62\r\n|--> RUN_HOOK(binlog_transmit, transmit_stop, (thd, flags))\r\n\r\n<\/pre>\n<h4>slave io\u7ebf\u7a0b<\/h4>\n<p>slave io\u7ebf\u7a0b\u5728while\u5faa\u73af\u4e2d\u4e0d\u65ad\u63a5\u6536\u5230\u4e3b\u5e93\u53d1\u6765\u7684binlog\u540e\uff0c\u68c0\u6d4bevent\u5934\u90e8\u4ee5\u786e\u5b9a\u662f\u5426\u9700\u8981\u56de\u590d\u4e3b\u5e93ack\uff0c\u5982\u679c\u9700\u8981\uff0c\u5c06\u5bf9\u5e94\u7684binlog\u6587\u4ef6\u540d\u548cpos\u56de\u590d\u4e3b\u5e93<\/p>\n<pre lang=\"c\">\r\nhandle_slave_io\r\n|--> RUN_HOOK(binlog_relay_io, thread_start, (thd, mi))\r\n|--> register_slave_on_master(mysql, mi, &suppress_warnings)\r\n\r\nwhile (!io_slave_killed(thd,mi))\r\n|--> request_dump\r\n   |--> RUN_HOOK(binlog_relay_io, before_request_transmit, (thd, mi, binlog_flags))\r\n|--> read_event\r\n\/\/ \u8bfb\u53d6semi-sync\u5934\u90e8\u5e76\u8fdb\u884c\u6821\u9a8c\r\n|--> RUN_HOOK(binlog_relay_io, after_read_event,\r\n                   (thd, mi,(const char*)mysql->net.read_pos + 1,\r\n                    event_len, &event_buf, &event_len))\r\n|--> queue_event\r\n\/\/ \u56de\u590d\u4e3b\u5e93ack\r\n|--> RUN_HOOK(binlog_relay_io, after_queue_event,\r\n                   (thd, mi, event_buf, event_len, synced))\r\nend while\r\n\r\nRUN_HOOK(binlog_relay_io, thread_stop, (thd, mi))\r\n\r\n<\/pre>\n<h3>\u5b9e\u73b0\u7ec6\u8282<\/h3>\n<p>1). <strong>\u5907\u5e93\u53d1\u9001\u5230\u4e3b\u5e93\u7684ack\u4fe1\u606f<\/strong>\uff1aio\u7ebf\u7a0b\u6536\u5230\u7684\u6765\u81ea\u4e3b\u5e93\u7684binlog\u6587\u4ef6\u540d\u548cpos\uff0c\u6839\u636eevent header\u786e\u5b9a\u662f\u5426\u56de\u590d\u4e3b\u5e93ack\uff0cack\u7531slave io\u53d1\u9001\uff08<strong>after_queue_event<\/strong>\uff09\uff0c\u7531\u4e3b\u5e93dump\u7ebf\u7a0b\u63a5\u6536\uff08<strong>after_send_event<\/strong>\uff09<\/p>\n<p>2). <strong>reply_file_name_\/reply_file_pos_<\/strong>: \u4e3b\u5e93\u5df2\u7ecf\u6536\u5230\u7684\u6700\u5927ack\uff0c\u5728\u6536\u5230ack\u540e\u66f4\u65b0\uff08<strong>after_send_event<\/strong>\uff09\uff0c\u82e5dump\u7ebf\u7a0b\u53d1\u9001\u7ed9\u5907\u5e93\u7684binlog\u7684\u6587\u4ef6\u540d\u548cpos\u5c0f\u4e8e\u8be5\u7ec4\u5408\uff0c\u8bbe\u7f6eevent header\u4ee5\u544a\u8bc9\u5907\u5e93\u4e0d\u9700\u8981\u56de\u590dack\uff08<strong>before_send_event<\/strong>\uff09\uff0c\u56e0\u4e3a\u4e3b\u5e93\u5df2\u7ecf\u6536\u5230\u6765\u81ea\u5176\u4ed6\u5907\u5e93\u66f4\u5927\u7684ack\u4e86\uff1b\u7528\u6237\u7ebf\u7a0b\u5728\u6700\u7ec8\u63d0\u4ea4\u4e8b\u52a1\u65f6\u82e5\u5bf9\u5e94\u7684binlog\u4f4d\u70b9\u5c0f\u4e8e\u8be5\u7ec4\u5408\u4e5f\u4e0d\u9700\u8981dump\u7ebf\u7a0b\u7b49\u5f85\u63a5\u6536ack\uff08<strong>after_commit<\/strong>\uff09<\/p>\n<p>3). <strong>wait_file_name_\/wait_file_pos_<\/strong>: \u6240\u6709dump\u7ebf\u7a0b\u7b49\u5f85\u7684\u6700\u5c0fack\uff0c\u82e5dump\u7ebf\u7a0b\u53d1\u9001\u7ed9\u5907\u5e93\u7684binlog\u7684\u6587\u4ef6\u540d\u548cpos\u5c0f\u4e8e\u8be5\u7ec4\u5408\uff0c\u8bbe\u7f6eevent header\u4ee5\u544a\u8bc9\u5907\u5e93\u4e0d\u9700\u8981\u56de\u590dack\uff08<strong>before_send_event<\/strong>\uff09\uff0c\u56e0\u4e3a\u5df2\u7ecf\u5b58\u5728\u7528\u6237\u7ebf\u7a0b\u5728\u7b49\u5f85\u4e00\u4e2a\u66f4\u5927\u7684\u4f4d\u70b9\u4e86\uff1b\u7528\u6237\u7ebf\u7a0b\u9700\u8981\u7b49\u5f85dump\u7ebf\u7a0b\u63a5\u6536\u5230ack\u65f6\u66f4\u65b0\uff08<strong>after_commit<\/strong>\uff09\uff0c\u5f53dump\u7ebf\u7a0b\u6536\u5230ack\u65f6\uff0c\u786e\u5b9a\u662f\u5426\u9700\u8981\u5524\u9192\u7b49\u5f85\u7684\u7528\u6237\u7ebf\u7a0b\uff08<strong>after_send_event<\/strong>\uff09<\/p>\n<p>4). <strong>commit_file_name_\/commit_file_pos_<\/strong>: \u6240\u6709\u7528\u6237\u7ebf\u7a0b\u6b63\u5728\u63d0\u4ea4\u4e8b\u52a1\u7684\u6700\u5927binlog\u4f4d\u70b9\uff0c\u5728\u5199\u5165binlog\u4e4b\u540e\u66f4\u65b0\uff08<strong>after_flush<\/strong>\uff09\uff0c\u5f53semi-sync\u56e0\u4e3a\u7b49\u5f85ack\u8d85\u65f6\u81ea\u52a8\u5207\u6362\u5230\u5f02\u6b65\u590d\u5236\u65f6\uff0c\u5982\u679cdump\u7ebf\u7a0b\u53d1\u9001\u7684binlog\u4f4d\u70b9\u8d76\u4e0a\u8be5\u7ec4\u5408\uff0c\u91cd\u65b0\u542f\u52a8semi-sync<\/p>\n<p>5). <strong>active_tranxs_<\/strong>\uff1a\u6d3b\u8dc3\u4e8b\u52a1binlog\u4f4d\u70b9\uff0c\u4f7f\u7528\u94fe\u8868\u7ba1\u7406\uff0c\u540c\u65f6\u4fdd\u5b58\u4e3a\u4e00\u4e2ahash\uff0ckey\u4e3a<file_name, file_pos>\uff0c\u5728\u5199\u5165binlog\u4e4b\u540e\u63d2\u5165\u6570\u636e\uff08<strong>after_flush<\/strong>\uff09\uff0c\u5728dump\u7ebf\u7a0b\u6536\u5230\u66f4\u5927\u7684ack\u65f6\uff0c\u6e05\u9664active_tranxs_\u4e2d\u8be5ack\u4e4b\u524d\u7684\u6570\u636e\uff08<strong>after_send_event<\/strong>\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u5206\u6790\u57fa\u4e8eOracle MySQL 5.6.15\u7248\u672c\u6e90\u7801\uff0c\u662f\u5728\u9605\u8bfbMySQL\u6e90\u7801\u4ee5\u53ca\u5370\u98ce\u535a\u5ba2\u57fa\u7840\u4e0a\u603b\u7ed3\u7684\uff0c\u4f5c &hellip; <a href=\"http:\/\/www.gpfeng.com\/?p=515\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">MySQL semi-sync \u5b9e\u73b0\u539f\u7406\u5206\u6790<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[1],"tags":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p3tPZp-8j","jetpack_sharing_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=\/wp\/v2\/posts\/515"}],"collection":[{"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=515"}],"version-history":[{"count":19,"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=\/wp\/v2\/posts\/515\/revisions"}],"predecessor-version":[{"id":534,"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=\/wp\/v2\/posts\/515\/revisions\/534"}],"wp:attachment":[{"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=515"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=515"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=515"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}