{"id":499,"date":"2014-01-21T20:00:00","date_gmt":"2014-04-30T05:48:49","guid":{"rendered":"http:\/\/www.gpfeng.com\/?p=636"},"modified":"2014-04-30T13:59:27","modified_gmt":"2014-04-30T05:59:27","slug":"mysql%e8%87%aa%e6%88%91%e4%bf%9d%e6%8a%a4%e4%b8%8e%e5%b9%b6%e5%8f%91%e4%bc%98%e5%8c%96","status":"publish","type":"post","link":"http:\/\/www.gpfeng.com\/?p=499","title":{"rendered":"MySQL\u81ea\u6211\u4fdd\u62a4\u4e0e\u5e76\u53d1\u4f18\u5316"},"content":{"rendered":"

\u95ee\u9898\u80cc\u666f<\/h3>\n

\u7ebf\u4e0aMySQL\u5728\u5927\u4fc3\u65f6\u9047\u5230\u5e76\u53d1\u538b\u529b\u5927\u5bfc\u81f4threads_running\uff08\u5e76\u53d1\u6267\u884cquery\u7684\u7ebf\u7a0b\u6570\u76ee\uff09\u98d9\u5347\uff0cMySQL\u51fa\u73b0\u6027\u80fd\u6296\u52a8\u95ee\u9898\u751a\u81f3hang\u4f4f\uff0c\u867d\u7136\u5728InnoDB\u5c42\u6709innodb_thread_concurrency\u9650\u5236\u540c\u65f6\u8fdb\u5165InnoDB\u5b58\u50a8\u5c42\u8bfb\u5199\u6570\u636e\u7684\u7ebf\u7a0b\u6570\uff0c\u4f46\u662f\u8fd9\u4e2a\u53c2\u6570\u4e0d\u662f\u4e00\u4e2a\u786c\u9650\u5236\uff08\u7ebf\u7a0b\u5728\u9501\u7b49\u5f85\u7ed3\u675f\u540e\u5f3a\u5236\u8fdb\u5165InnoDB\u5c42\uff09\uff0c\u800c\u4e14\u4ee3\u7801\u8def\u5f84\u6bd4\u8f83\u9760\u540e\uff0c\u4f5c\u7528\u6709\u9650\uff0c\u4e8e\u5c1d\u8bd5\u5728server\u5c42\u9650\u5236\u5e76\u53d1\u6570\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u901a\u8fc7\u4e0d\u65ad\u5730\u4f18\u5316\u548c\u6d4b\u8bd5\uff0c\u5f00\u53d1\u5b8c\u6210\u4e86\u4e00\u4e2a\u9ad8\u6c34\u4f4d\u9650\u6d41\/\u4f4e\u6c34\u4f4d\u4f18\u5316\u7684patch<\/p>\n

patch\u529f\u80fd\u4ecb\u7ecd<\/h3>\n

\u8fd9\u4e2apatch\u662f\u5728\u4e4b\u524dthread running control<\/a>\u7684\u57fa\u7840\u4e0a\u4f18\u5316\u7684\uff0c\u5c06\u4e4b\u524d\u4f4d\u4e8e\u540c\u4e00\u4e2a\u51fd\u6570\u4e2d\u4e24\u4e2a\u529f\u80fd\u72ec\u7acb\u51fa\u6765\u5e76\u5c06\u4e4b\u524d\u4f4e\u6c34\u4f4d\u9650\u6d41\u5b9e\u73b0\u4ece\u57fa\u4e8esleep-retry\u7684\u673a\u5236\u4f18\u5316\u6210\u57fa\u4e8eFIFO\u7684cond-wait\/signal\u673a\u5236
\n
\n1. \u9ad8\u6c34\u4f4d\u9650\u6d41\uff1a\u4e25\u683c\u63a7\u5236threads_running\u4e0a\u9650\uff0c\u5f53\u5e76\u53d1\u8fd0\u884cquery\u6570\u76ee\u8d85\u8fc7\u9608\u503cthreads_running_high_watermark\u65f6\uff0c\u76f4\u63a5\u62d2\u7edd\u6267\u884c\u5e76\u8fd4\u56de\u9519\u8bef\uff0c\u4fdd\u8bc1MySQL\u670d\u52a1\u7a33\u5b9a\u6027<\/p>\n

2. \u4f4e\u6c34\u4f4d\u4f18\u5316\uff1a\u63a7\u5236\u6d3b\u8dc3\u5e76\u53d1\u7ebf\u7a0b\u6570\uff0c\u5f53\u4f7f\u7528one-thread-per-connection\u8c03\u5ea6\u6a21\u5f0f\u65f6\uff08\u7ebf\u4e0a\u76ee\u524d\u4f7f\u7528\uff09\uff0c\u6bcf\u4e2a\u8fde\u63a5\u5728MySQL\u4e2d\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u6765\u670d\u52a1\uff0c\u5f53\u5e76\u53d1\u7a81\u589e\u65f6\uff0c\u5927\u91cf\u7ebf\u7a0b\u88ab\u521b\u5efa\uff0c\u5bfc\u81f4\u8d44\u6e90\u4f7f\u7528\uff0c\u9501\u7ade\u4e89\uff0ccontext-switch\u5927\u5927\u589e\u52a0\uff0c\u5f80\u5f80\u4f1a\u5bfc\u81f4\u6027\u80fd\u7684\u4e0b\u964d\uff0c\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\uff0c\u793e\u533a\u4e2dmariadb\u5f00\u53d1\u4e86threadpool\u65b9\u6848\uff0cpercona\u5728\u5176\u4e0a\u5b9e\u73b0\u4e86\u4f18\u5148\u961f\u5217\uff08\u540e\u7eed\u4f1a\u64b0\u6587\u4ecb\u7ecd\uff09\uff0c\u89e3\u51b3\u95ee\u9898\u7684\u601d\u8def\u90fd\u662f\u9650\u5236\u6d3b\u8dc3\u5e76\u53d1\u7ebf\u7a0b\u6570\uff0c\u8ba9\u5c11\u91cf\u7684worker\u7ebf\u7a0b\u670d\u52a1\u5927\u91cf\u7684\u8fde\u63a5\uff0c\u6211\u4eec\u5b9e\u73b0\u7684\u4f4e\u6c34\u4f4d\u4f18\u5316\u7684\u601d\u8def\u4e0ethreadpool\u4e00\u81f4\uff0c\u4f46\u662f\u5b9e\u73b0\u65b9\u6848\u66f4\u52a0\u7b80\u6d01\uff08patch\u4e0d\u8d85\u8fc71000\u884c\uff09\uff0c\u800c\u4e14\u589e\u52a0\u4e86\u9488\u5bf9\u7279\u5b9aquery\u8fc7\u6ee4\u7684\u7279\u6027
\n\u9ad8\u6c34\u4f4d\u9650\u6d41\u5b9e\u73b0\u7ec6\u8282<\/p>\n

\u76d1\u63a7\u7cfb\u7edfstatus\u53d8\u91cfthreads_running\uff0c\u5f53\u6ee1\u8db3\u62d2\u7edd\u6761\u4ef6\u662f\uff0c\u62d2\u7edd\u6267\u884csql\uff0c\u8fd4\u56de\u7528\u6237\uff1aMySQL Server is too busy\uff0c\u5224\u65ad\u903b\u8f91\u5728dispatch_command\u4e2d\uff0csql\u89e3\u6790\u4e4b\u524d<\/p>\n

\u589e\u52a0\u7684\u7cfb\u7edfvariables\uff1a <\/h4>\n

threads_running_ctl_mode\uff1a \u9650\u6d41\u7684sql\u7c7b\u578b\uff0c\u6709\u4e24\u4e2a\u53d6\u503c\uff1a[ALL | SELECTS]\uff0c\u9ed8\u8ba4SELECTS\uff0c\u8bbe\u7f6e\u4e3aALL\u9700\u8c28\u614e
\nthreads_running_high_watermark\uff1a \u9650\u6d41\u6c34\u4f4d\u503c\uff0c\u53ea\u6709threads_running\u8d85\u8fc7\u6b64\u503c\u624d\u4f1a\u89e6\u53d1\uff0c\u9ed8\u8ba4\u503c\u4e3amax_connections\uff0c\u5f53set global threads_running_high_watermark=0\u65f6\u81ea\u52a8\u8bbe\u7f6e\u4e3amax_connections<\/p>\n

\u62d2\u7edd\u5fc5\u8981\u6761\u4ef6\uff1a <\/strong>
\n1.threads_running\u8d85\u8fc7threads_running_high_watermark
\n2.threads_running_ctl_mode\u4e0esql\u7c7b\u578b\u76f8\u7b26<\/p>\n

\u4ee5\u4e0b\u60c5\u51b5\u4e0d\u62d2\u7edd\uff1a <\/strong>
\n1.\u7528\u6237\u5177\u6709super\u6743\u9650
\n2.sql\u6240\u5728\u4e8b\u52a1\u5df2\u7ecf\u5f00\u542f
\n3.sql\u4e3acommit\/rollback<\/p>\n

\u4f4e\u6c34\u4f4d\u4f18\u5316\u5b9e\u73b0\u7ec6\u8282<\/h4>\n

1. \u589e\u52a0\u4e86\u7cfb\u7edf\u53d8\u91cfthreads_active\u6765\u8bb0\u5f55\u5e76\u53d1\u7ebf\u7a0b\u6570\u76ee\uff0c\u5224\u65ad\u903b\u8f91\u5728mysql_execute_command\u4e2d\uff0csql\u89e3\u6790\u4e4b\u540e\uff0cthreads_active\u53ea\u7edf\u8ba1SELECT\/INSERT\/UPDATE\/DELETE\uff0cCOMMIT\/ROLLBACK\/DDL\u7b49\u4e0d\u7edf\u8ba1\u5728\u5185\uff0c\u56e0\u6b64\u4e0d\u53d7\u9650\u6d41\u5f71\u54cd<\/p>\n

2. \u5b9e\u73b0\u91c7\u7528FIFO\u6392\u961f\u601d\u8def\uff0c\u5f53\u7cfb\u7edf\u5f53\u524dthreads_active\u8d85\u8fc7\u9608\u503cthreads_running_low_watermark\u65f6\uff0c\u7ebf\u7a0b\u8fdb\u5165FIFO\u4e2d\u6392\u961f\u7b49\u5f85\uff0c\u5176\u5b83\u7ebf\u7a0b\u5728\u6267\u884c\u5b8csql\u540e\u4f9d\u6b21\u5524\u9192FIFO\u4e2d\u7ebf\u7a0b\uff0c\u4fdd\u8bc1\u5e76\u53d1\u7ebf\u7a0b\u63a7\u5236\u5728threads_running_low_watermark\u4e4b\u5185\uff0c\u540c\u65f6\u5f15\u5165\u53d8\u91cfthreads_running_wait_timeout\u63a7\u5236\u7ebf\u7a0b\u5728FIFO\u7b49\u5f85\u6700\u5927\u65f6\u95f4\uff0c\u7b49\u5f85\u8d85\u65f6\u7684sql\u88abreject\uff0c\u8fd4\u56de\u7528\u6237\uff1aMySQL Server is too busy<\/p>\n

3. \u4e3a\u4e86\u964d\u4f4e\u9ad8\u5e76\u53d1\u4e0b\u5927\u91cf\u7ebf\u7a0b\u8fdb\u5165\/\u9000\u51faFIFO\u7684\u9501\u7ade\u4e89\uff0c\u5b9e\u73b0\u8fc7\u7a0b\u4e2d\u91c7\u7528multi-fifo\u7684\u7b56\u7565\uff088\u4e2afifo\u961f\u5217\uff09\uff0c\u6bcf\u4e2a\u961f\u5217\u9650\u5236\u5e76\u53d1\u8fd0\u884c\u7ebf\u7a0b\u6570\u4e3a\uff08threads_running_low_watermark\/8\uff09\uff0c\u7ebf\u7a0b\u6309\u7167round robin\u88ab\u5206\u914d\u5230\u4e0d\u540c\u7684fifo\u4e2d<\/p>\n

\u589e\u52a0\u7684\u7cfb\u7edfvariables\uff1a<\/h4>\n

threads_running_ctl_mode: \u4f5c\u7528\u540c\u9ad8\u6c34\u4f4d
\nthreads_running_low_watermark\uff1a threads_active\u9608\u503c\uff0c\u5f53\u524dthreads_active\u8d85\u8fc7\u6b64\u503c\u65f6\uff0c\u89e6\u53d1\u9650\u6d41\u6392\u961f\uff0c\u9ed8\u8ba4\u4e3a0\uff08\u4e0d\u5f00\u542f\u9650\u6d41\uff09
\nthreads_running_wait_timeout\uff1a\u8fdb\u5165FIFO\u6392\u961f\u6700\u957f\u65f6\u95f4\uff0c\u7b49\u5f85\u8d85\u65f6\u540esql\u88ab\u62d2\uff0c\u9ed8\u8ba4100\uff0c\u5355\u4f4d\u4e3a\u6beb\u79d2ms<\/p>\n

\u62d2\u7edd\u5fc5\u8981\u6761\u4ef6\uff1a <\/strong>
\n1.threads_running_low_watermark\u8bbe\u7f6e\u4e0d\u4e3a0\uff0c\u4e14threads_active\u8d85\u8fc7threads_running_low_watermark
\n2.threads_running_ctl_mode\u4e0esql\u7c7b\u578b\u76f8\u7b26<\/p>\n

\u4ee5\u4e0b\u60c5\u51b5\u4e0d\u62d2\u7edd\uff1a <\/strong>
\n1.\u7528\u6237\u5177\u6709super\u6743\u9650
\n2.sql\u6240\u5728\u4e8b\u52a1\u5df2\u7ecf\u5f00\u542f<\/p>\n

\u589e\u52a0\u7684status\uff1a<\/h4>\n

threads_active: \u5f53\u524d\u5e76\u53d1SELECT\/INSERT\/UPDATE\/DELETE\u6267\u884c\u7684\u7ebf\u7a0b\u6570\u76ee
\nthreads_wait\uff1a\u5f53\u524d\u8fdb\u5165\u5230FIFO\u4e2d\u7b49\u5f85\u7684\u7ebf\u7a0b\u6570\u76ee
\nthreads_rejected\uff1a \u62d2\u7edd\u7684sql\u6570\u76ee\uff0c\u5305\u542b\u9ad8\u6c34\u4f4d\u548c\u4f4e\u6c34\u4f4d\u9650\u6d41<\/p>\n

\u6027\u80fd\u4f18\u5316\u7ed3\u679c<\/h3>\n

\u6d4b\u8bd5\u811a\u672c\uff1a<\/h4>\n
\r\n.\/sysbench --test=tests\/db\/select.lua --max-requests=0 --mysql-host=myxxxx.cm3 --mysql-user=test \r\n--mysql-table-engine=innodb --oltp-table-size=5000000 --oltp-tables-count=32  --num-threads=$threads run\r\n<\/pre>\n
\"tr-ctl\"<\/a>
\nnormal mysql-0<\/strong> : \u672a\u6253\u8865\u4e01\u7248\u672c\uff0c\u8bbe\u7f6einnodb_thread_concurrency=0
\nnormal mysql-1<\/strong> : \u672a\u6253\u8865\u4e01\u7248\u672c\uff0cinnodb_thread_concurrency=32
\npatched mysql<\/strong> : \u4f4e\u6c34\u4f4d\u9650\u6d41\u8865\u4e01\u7248\u672c\uff08\u6d3b\u8dc3\u7ebf\u7a0b\u6570\u4e0d\u8d85\u8fc764\uff09<\/p>\n
\u5728\u8d85\u8fc710000\u4e2a\u8fde\u63a5\u4e0b\uff0c\u4f4e\u6c34\u4f4d\u9650\u6d41\u7248\u672c\u901a\u8fc7\u9650\u5236\u6d3b\u8dc3\u5e76\u53d1\u7ebf\u7a0b\u6570\u76ee\u53ef\u4ee5\u4fdd\u8bc1MySQL\u6027\u80fd\u7ef4\u6301\u5728\u4e00\u4e2a\u8f83\u9ad8\u503c<\/p>\n
patch\u4e0b\u8f7d<\/a><\/h3>\n
\u82e5\u5bf9\u9650\u6d41\u4f18\u5316patch\u7684\u5b9e\u73b0\u7ec6\u8282\u611f\u5174\u8da3\uff0c\u53ef\u4ee5\u4e0b\u8f7dpatch\uff0c\u6b22\u8fce\u63d0\u51fa\u95ee\u9898\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u95ee\u9898\u80cc\u666f \u7ebf\u4e0aMySQL\u5728\u5927\u4fc3\u65f6\u9047\u5230\u5e76\u53d1\u538b\u529b\u5927\u5bfc\u81f4threads_running\uff08\u5e76\u53d1\u6267\u884cquery\u7684\u7ebf\u7a0b\u6570\u76ee … \u7ee7\u7eed\u9605\u8bfbMySQL\u81ea\u6211\u4fdd\u62a4\u4e0e\u5e76\u53d1\u4f18\u5316<\/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-83","jetpack_sharing_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=\/wp\/v2\/posts\/499"}],"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=499"}],"version-history":[{"count":1,"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=\/wp\/v2\/posts\/499\/revisions"}],"predecessor-version":[{"id":641,"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=\/wp\/v2\/posts\/499\/revisions\/641"}],"wp:attachment":[{"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=499"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=499"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.gpfeng.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}