{"id":1780,"date":"2020-07-01T04:53:57","date_gmt":"2020-06-30T20:53:57","guid":{"rendered":"http:\/\/39.97.231.10\/?p=1780"},"modified":"2020-07-01T04:53:57","modified_gmt":"2020-06-30T20:53:57","slug":"hbase-compaction-%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=1780","title":{"rendered":"HBase Compaction \u89e3\u6790"},"content":{"rendered":"<h1>Compaction\u662f\u4ec0\u4e48\uff1f<\/h1>\n<article>\u4e86\u89e3HBase\u7684\u7ae5\u978b\u90fd\u77e5\u9053\uff0cHBase\u662f\u4e00\u79cdLSM\uff08Log-Structured Merge Tree\uff09\u67b6\u6784\u6a21\u5f0f\uff0c\u7528\u6237\u6570\u636e\u5199\u5165\u5148\u5199WAL\uff0c\u518d\u5199\u7f13\u5b58\uff0c\u6ee1\u8db3\u4e00\u5b9a\u6761\u4ef6\u540e\u7f13\u5b58\u6570\u636e\u4f1a\u6267\u884cflush\u64cd\u4f5c\u771f\u6b63\u843d\u76d8\uff0c\u5f62\u6210\u4e00\u4e2a\u6570\u636e\u6587\u4ef6HFile\u3002\u968f\u7740\u6570\u636e\u5199\u5165\u4e0d\u65ad\u589e\u591a\uff0cflush\u6b21\u6570\u4e5f\u4f1a\u4e0d\u65ad\u589e\u591a\uff0c\u8fdb\u800cHFile\u6570\u636e\u6587\u4ef6\u5c31\u4f1a\u8d8a\u6765\u8d8a\u591a\u3002\u7136\u800c\uff0c\u592a\u591a\u6570\u636e\u6587\u4ef6\u4f1a\u5bfc\u81f4\u6570\u636e\u67e5\u8be2IO\u6b21\u6570\u589e\u591a\uff0c\u56e0\u6b64HBase\u5c1d\u8bd5\u7740\u4e0d\u65ad\u5bf9\u8fd9\u4e9b\u6587\u4ef6\u8fdb\u884c\u5408\u5e76\uff0c\u8fd9\u4e2a\u5408\u5e76\u8fc7\u7a0b\u79f0\u4e3aCompaction\u3002<\/p>\n<h2>\u4e3a\u4ec0\u4e48\u8981Compaction\uff1f<\/h2>\n<h2>Compaction \u5206\u7c7b<\/h2>\n<p>Compaction\u4f1a\u4ece\u4e00\u4e2aregion\u7684\u4e00\u4e2astore\u4e2d\u9009\u62e9\u4e00\u4e9bhfile\u6587\u4ef6\u8fdb\u884c\u5408\u5e76\u3002\u5408\u5e76\u8bf4\u6765\u539f\u7406\u5f88\u7b80\u5355\uff0c\u5148\u4ece\u8fd9\u4e9b\u5f85\u5408\u5e76\u7684\u6570\u636e\u6587\u4ef6\u4e2d\u8bfb\u51faKeyValues\uff0c\u518d\u6309\u7167\u7531\u5c0f\u5230\u5927\u6392\u5217\u540e\u5199\u5165\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6\u4e2d\u3002\u4e4b\u540e\uff0c\u8fd9\u4e2a\u65b0\u751f\u6210\u7684\u6587\u4ef6\u5c31\u4f1a\u53d6\u4ee3\u4e4b\u524d\u5f85\u5408\u5e76\u7684\u6240\u6709\u6587\u4ef6\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\u3002HBase\u6839\u636e\u5408\u5e76\u89c4\u6a21\u5c06Compaction\u5206\u4e3a\u4e86\u4e24\u7c7b\uff1aMinorCompaction\u548cMajorCompaction<\/p>\n<div>\n<div>\n<div><\/div>\n<div data-width=\\\"457\\\" data-height=\\\"319\\\"><img src=\\\"https:\/\/upload-images.jianshu.io\/upload_images\/13873072-88acf776758832ea.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/457\/format\/webp\\\" data-original-src=\\\"\/\/upload-images.jianshu.io\/upload_images\/13873072-88acf776758832ea.png\\\" data-original-width=\\\"457\\\" data-original-height=\\\"319\\\" data-original-format=\\\"image\/png\\\" data-original-filesize=\\\"93459\\\" data-image-index=\\\"0\\\" \/><\/div>\n<\/div>\n<div><\/div>\n<\/div>\n<ul>\n<li>Minor Compaction\u662f\u6307\u9009\u53d6\u4e00\u4e9b\u5c0f\u7684\u3001\u76f8\u90bb\u7684StoreFile\u5c06\u4ed6\u4eec\u5408\u5e76\u6210\u4e00\u4e2a\u66f4\u5927\u7684StoreFile\uff0c\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u4e0d\u4f1a\u5904\u7406\u5df2\u7ecfDeleted\u6216Expired\u7684Cell\u3002\u4e00\u6b21Minor Compaction\u7684\u7ed3\u679c\u662f\u66f4\u5c11\u5e76\u4e14\u66f4\u5927\u7684StoreFile\u3002<\/li>\n<li>Major Compaction\u662f\u6307\u5c06\u6240\u6709\u7684StoreFile\u5408\u5e76\u6210\u4e00\u4e2aStoreFile\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u8fd8\u4f1a\u6e05\u7406\u4e09\u7c7b\u65e0\u610f\u4e49\u6570\u636e\uff1a\u88ab\u5220\u9664\u7684\u6570\u636e\u3001TTL\u8fc7\u671f\u6570\u636e\u3001\u7248\u672c\u53f7\u8d85\u8fc7\u8bbe\u5b9a\u7248\u672c\u53f7\u7684\u6570\u636e\u3002\u53e6\u5916\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\uff0cMajor Compaction\u65f6\u95f4\u4f1a\u6301\u7eed\u6bd4\u8f83\u957f\uff0c\u6574\u4e2a\u8fc7\u7a0b\u4f1a\u6d88\u8017\u5927\u91cf\u7cfb\u7edf\u8d44\u6e90\uff0c\u5bf9\u4e0a\u5c42\u4e1a\u52a1\u6709\u6bd4\u8f83\u5927\u7684\u5f71\u54cd\u3002\u56e0\u6b64\u7ebf\u4e0a\u4e1a\u52a1\u90fd\u4f1a\u5c06\u5173\u95ed\u81ea\u52a8\u89e6\u53d1Major Compaction\u529f\u80fd\uff0c\u6539\u4e3a\u624b\u52a8\u5728\u4e1a\u52a1\u4f4e\u5cf0\u671f\u89e6\u53d1\u3002<\/li>\n<\/ul>\n<h2>Compaction\u7684\u89e6\u53d1\u65f6\u673a<\/h2>\n<p>HBase\u4e2d\u53ef\u4ee5\u89e6\u53d1compaction\u7684\u56e0\u7d20\u6709\u5f88\u591a\uff0c\u6700\u5e38\u89c1\u7684\u56e0\u7d20\u6709\u8fd9\u4e48\u4e09\u79cd\uff1aMemstore Flush\u3001\u540e\u53f0\u7ebf\u7a0b\u5468\u671f\u6027\u68c0\u67e5\u3001\u624b\u52a8\u89e6\u53d1\u3002<\/p>\n<div>\n<div>\n<div><\/div>\n<div data-width=\\\"352\\\" data-height=\\\"263\\\"><img src=\\\"https:\/\/upload-images.jianshu.io\/upload_images\/13873072-c55331024265944d.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/352\/format\/webp\\\" data-original-src=\\\"\/\/upload-images.jianshu.io\/upload_images\/13873072-c55331024265944d.png\\\" data-original-width=\\\"352\\\" data-original-height=\\\"263\\\" data-original-format=\\\"image\/png\\\" data-original-filesize=\\\"54688\\\" data-image-index=\\\"1\\\" \/><\/div>\n<\/div>\n<div><\/div>\n<\/div>\n<ol>\n<li>Memstore Flush: \u5e94\u8be5\u8bf4compaction\u64cd\u4f5c\u7684\u6e90\u5934\u5c31\u6765\u81eaflush\u64cd\u4f5c\uff0cmemstore flush\u4f1a\u4ea7\u751fHFile\u6587\u4ef6\uff0c\u6587\u4ef6\u8d8a\u6765\u8d8a\u591a\u5c31\u9700\u8981compact\u3002\u56e0\u6b64\u5728\u6bcf\u6b21\u6267\u884c\u5b8cFlush\u64cd\u4f5c\u4e4b\u540e\uff0c\u90fd\u4f1a\u5bf9\u5f53\u524dStore\u4e2d\u7684\u6587\u4ef6\u6570\u8fdb\u884c\u5224\u65ad\uff0c\u4e00\u65e6\u6587\u4ef6\u6570 &gt; \u9884\u503c \uff0c\u5c31\u4f1a\u89e6\u53d1compaction\u3002\u9700\u8981\u8bf4\u660e\u7684\u662f\uff0ccompaction\u90fd\u662f\u4ee5Store\u4e3a\u5355\u4f4d\u8fdb\u884c\u7684\uff0c\u800c\u5728Flush\u89e6\u53d1\u6761\u4ef6\u4e0b\uff0c\u6574\u4e2aRegion\u7684\u6240\u6709Store\u90fd\u4f1a\u6267\u884ccompact\uff0c\u6240\u4ee5\u4f1a\u5728\u77ed\u65f6\u95f4\u5185\u6267\u884c\u591a\u6b21compaction\u3002<\/li>\n<\/ol>\n<ol start=\\\"2\\\">\n<li>\u540e\u53f0\u7ebf\u7a0b\u5468\u671f\u6027\u68c0\u67e5\uff1a\u540e\u53f0\u7ebf\u7a0bCompactionChecker\u5b9a\u671f\u89e6\u53d1\u68c0\u67e5\u662f\u5426\u9700\u8981\u6267\u884ccompaction\uff0c\u68c0\u67e5\u5468\u671f\u4e3a\uff1ahbase.server.thread.wakefrequencyhbase.server.compactchecker.interval.multiplier\u3002\u548cMemstore flush\u4e0d\u540c\u7684\u662f\uff0c\u8be5\u7ebf\u7a0b\u4f18\u5148\u68c0\u67e5\u6587\u4ef6\u6570\uff03\u662f\u5426\u5927\u4e8e\uff0c\u4e00\u65e6\u5927\u4e8e\u5c31\u4f1a\u89e6\u53d1compaction\u3002\u5982\u679c\u4e0d\u6ee1\u8db3\uff0c\u5b83\u4f1a\u63a5\u7740\u68c0\u67e5\u662f\u5426\u6ee1\u8db3major compaction\u6761\u4ef6\uff0c\u7b80\u5355\u6765\u8bf4\uff0c\u5982\u679c\u5f53\u524dstore\u4e2dhfile\u7684\u6700\u65e9\u66f4\u65b0\u65f6\u95f4\u65e9\u4e8e\u67d0\u4e2a\u503cmcTime\uff0c\u5c31\u4f1a\u89e6\u53d1major compaction\uff0cHBase\u9884\u60f3\u901a\u8fc7\u8fd9\u79cd\u673a\u5236\u5b9a\u671f\u5220\u9664\u8fc7\u671f\u6570\u636e\u3002\u4e0a\u6587mcTime\u662f\u4e00\u4e2a\u6d6e\u52a8\u503c\uff0c\u6d6e\u52a8\u533a\u95f4\u9ed8\u8ba4\u4e3a\uff3b7-70.2\uff0c7+7*0.2\uff3d\uff0c\u5176\u4e2d7\u4e3ahbase.hregion.majorcompaction\uff0c0.2\u4e3ahbase.hregion.majorcompaction.jitter\uff0c\u53ef\u89c1\u9ed8\u8ba4\u57287\u5929\u5de6\u53f3\u5c31\u4f1a\u6267\u884c\u4e00\u6b21major compaction\u3002\u7528\u6237\u5982\u679c\u60f3\u7981\u7528major compaction\uff0c\u53ea\u9700\u8981\u5c06\u53c2\u6570hbase.hregion.majorcompaction\u8bbe\u4e3a0<\/li>\n<\/ol>\n<ol start=\\\"3\\\">\n<li>\u624b\u52a8\u89e6\u53d1\uff1a\u4e00\u822c\u6765\u8bb2\uff0c\u624b\u52a8\u89e6\u53d1compaction\u901a\u5e38\u662f\u4e3a\u4e86\u6267\u884cmajor compaction\uff0c\u539f\u56e0\u6709\u4e09\uff0c\u5176\u4e00\u662f\u56e0\u4e3a\u5f88\u591a\u4e1a\u52a1\u62c5\u5fc3\u81ea\u52a8major compaction\u5f71\u54cd\u8bfb\u5199\u6027\u80fd\uff0c\u56e0\u6b64\u4f1a\u9009\u62e9\u4f4e\u5cf0\u671f\u624b\u52a8\u89e6\u53d1\uff1b\u5176\u4e8c\u4e5f\u6709\u53ef\u80fd\u662f\u7528\u6237\u5728\u6267\u884c\u5b8calter\u64cd\u4f5c\u4e4b\u540e\u5e0c\u671b\u7acb\u523b\u751f\u6548\uff0c\u6267\u884c\u624b\u52a8\u89e6\u53d1major compaction\uff1b\u5176\u4e09\u662fHBase\u7ba1\u7406\u5458\u53d1\u73b0\u786c\u76d8\u5bb9\u91cf\u4e0d\u591f\u7684\u60c5\u51b5\u4e0b\u624b\u52a8\u89e6\u53d1major compaction\u5220\u9664\u5927\u91cf\u8fc7\u671f\u6570\u636e\uff1b\u65e0\u8bba\u54ea\u79cd\u89e6\u53d1\u52a8\u673a\uff0c\u4e00\u65e6\u624b\u52a8\u89e6\u53d1\uff0cHBase\u4f1a\u4e0d\u505a\u5f88\u591a\u81ea\u52a8\u5316\u68c0\u67e5\uff0c\u76f4\u63a5\u6267\u884c\u5408\u5e76\u3002<\/li>\n<\/ol>\n<h2>Compaction\u4f5c\u7528 | \u526f\u4f5c\u7528<\/h2>\n<p>\u968f\u7740hfile\u6587\u4ef6\u6570\u4e0d\u65ad\u589e\u591a\uff0c\u4e00\u6b21\u67e5\u8be2\u5c31\u53ef\u80fd\u4f1a\u9700\u8981\u8d8a\u6765\u8d8a\u591a\u7684IO\u64cd\u4f5c\uff0c\u5ef6\u8fdf\u5fc5\u7136\u4f1a\u8d8a\u6765\u8d8a\u5927\uff0c\u5982\u4e0b\u56fe\u4e00\u6240\u793a\uff0c\u968f\u7740\u6570\u636e\u5199\u5165\u4e0d\u65ad\u589e\u52a0\uff0c\u6587\u4ef6\u6570\u4e0d\u65ad\u589e\u591a\uff0c\u8bfb\u53d6\u5ef6\u65f6\u4e5f\u5728\u4e0d\u65ad\u53d8\u5927\u3002\u800c\u6267\u884ccompaction\u4f1a\u4f7f\u5f97\u6587\u4ef6\u6570\u57fa\u672c\u7a33\u5b9a\uff0c\u8fdb\u800cIO Seek\u6b21\u6570\u4f1a\u6bd4\u8f83\u7a33\u5b9a\uff0c\u5ef6\u8fdf\u5c31\u4f1a\u7a33\u5b9a\u5728\u4e00\u5b9a\u8303\u56f4\u3002\u7136\u800c\uff0ccompaction\u64cd\u4f5c\u91cd\u5199\u6587\u4ef6\u4f1a\u5e26\u6765\u5f88\u5927\u7684\u5e26\u5bbd\u538b\u529b\u4ee5\u53ca\u77ed\u65f6\u95f4IO\u538b\u529b\u3002\u56e0\u6b64\u53ef\u4ee5\u8ba4\u4e3a\uff0cCompaction\u5c31\u662f\u4f7f\u7528\u77ed\u65f6\u95f4\u7684IO\u6d88\u8017\u4ee5\u53ca\u5e26\u5bbd\u6d88\u8017\u6362\u53d6\u540e\u7eed\u67e5\u8be2\u7684\u4f4e\u5ef6\u8fdf\u3002\u4ece\u56fe\u4e0a\u6765\u770b\uff0c\u5c31\u662f\u5ef6\u8fdf\u6709\u5f88\u5927\u7684\u6bdb\u523a\uff0c\u4f46\u603b\u4f53\u8d8b\u52bf\u57fa\u672c\u7a33\u5b9a\u4e0d\u53d8\uff0c\u89c1\u4e0b\u56fe\u4e8c\u3002<\/p>\n<div>\n<div>\n<div><\/div>\n<div data-width=\\\"917\\\" data-height=\\\"471\\\"><img src=\\\"https:\/\/upload-images.jianshu.io\/upload_images\/13873072-33b8336350da90d0.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/917\/format\/webp\\\" data-original-src=\\\"\/\/upload-images.jianshu.io\/upload_images\/13873072-33b8336350da90d0.png\\\" data-original-width=\\\"917\\\" data-original-height=\\\"471\\\" data-original-format=\\\"image\/png\\\" data-original-filesize=\\\"163183\\\" data-image-index=\\\"2\\\" \/><\/div>\n<\/div>\n<div>11<\/div>\n<\/div>\n<div>\n<div>\n<div><\/div>\n<div data-width=\\\"920\\\" data-height=\\\"472\\\"><img src=\\\"https:\/\/upload-images.jianshu.io\/upload_images\/13873072-f02122854aba4936.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/920\/format\/webp\\\" data-original-src=\\\"\/\/upload-images.jianshu.io\/upload_images\/13873072-f02122854aba4936.png\\\" data-original-width=\\\"920\\\" data-original-height=\\\"472\\\" data-original-format=\\\"image\/png\\\" data-original-filesize=\\\"199526\\\" data-image-index=\\\"3\\\" \/><\/div>\n<\/div>\n<div><\/div>\n<\/div>\n<p>\u4e3a\u4e86\u6362\u53d6\u540e\u7eed\u67e5\u8be2\u7684\u4f4e\u5ef6\u8fdf\uff0c\u9664\u4e86\u77ed\u65f6\u95f4\u7684\u8bfb\u653e\u5927\u4e4b\u5916\uff0cCompaction\u5bf9\u5199\u5165\u4e5f\u4f1a\u6709\u5f88\u5927\u7684\u5f71\u54cd\u3002\u6211\u4eec\u9996\u5148\u5047\u8bbe\u4e00\u4e2a\u73b0\u8c61\uff1a\u5f53\u5199\u8bf7\u6c42\u975e\u5e38\u591a\uff0c\u5bfc\u81f4\u4e0d\u65ad\u751f\u6210HFile\uff0c\u4f46compact\u7684\u901f\u5ea6\u8fdc\u8fdc\u8ddf\u4e0d\u4e0aHFile\u751f\u6210\u7684\u901f\u5ea6\uff0c\u8fd9\u6837\u5c31\u4f1a\u4f7fHFile\u7684\u6570\u91cf\u4f1a\u8d8a\u6765\u8d8a\u591a\uff0c\u5bfc\u81f4\u8bfb\u6027\u80fd\u6025\u5267\u4e0b\u964d\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u5728HFile\u7684\u6570\u91cf\u8fc7\u591a\u7684\u65f6\u5019\u4f1a\u9650\u5236\u5199\u8bf7\u6c42\u7684\u901f\u5ea6\uff1a\u5728\u6bcf\u6b21\u6267\u884cMemStore flush\u7684\u64cd\u4f5c\u524d\uff0c\u5982\u679cHStore\u7684HFile\u6570\u8d85\u8fc7hbase.hstore.blockingStoreFiles \uff08\u9ed8\u8ba47\uff09\uff0c\u5219\u4f1a\u963b\u585eflush\u64cd\u4f5chbase.hstore.blockingWaitTime\u65f6\u95f4\uff0c\u5728\u8fd9\u6bb5\u65f6\u95f4\u5185\uff0c\u5982\u679ccompact\u64cd\u4f5c\u4f7f\u5f97HStore\u6587\u4ef6\u6570\u4e0b\u964d\u5230\u56de\u8fd9\u4e2a\u503c\uff0c\u5219\u505c\u6b62\u963b\u585e\u3002\u53e6\u5916\u963b\u585e\u8d85\u8fc7\u65f6\u95f4\u540e\uff0c\u4e5f\u4f1a\u6062\u590d\u6267\u884cflush\u64cd\u4f5c\u3002\u8fd9\u6837\u505a\u5c31\u53ef\u4ee5\u6709\u6548\u5730\u63a7\u5236\u5927\u91cf\u5199\u8bf7\u6c42\u7684\u901f\u5ea6\uff0c\u4f46\u540c\u65f6\u8fd9\u4e5f\u662f\u5f71\u54cd\u5199\u8bf7\u6c42\u901f\u5ea6\u7684\u4e3b\u8981\u539f\u56e0\u4e4b\u4e00\u3002<br \/>\n\u53ef\u89c1\uff0cCompaction\u4f1a\u4f7f\u5f97\u6570\u636e\u8bfb\u53d6\u5ef6\u8fdf\u4e00\u76f4\u6bd4\u8f83\u5e73\u7a33\uff0c\u4f46\u4ed8\u51fa\u7684\u4ee3\u4ef7\u662f\u5927\u91cf\u7684\u8bfb\u5ef6\u8fdf\u6bdb\u523a\u548c\u4e00\u5b9a\u7684\u5199\u963b\u585e\u3002<\/p>\n<h2>Compaction\u6d41\u7a0b<\/h2>\n<p>\u4e86\u89e3\u4e86\u4e00\u5b9a\u7684\u80cc\u666f\u77e5\u8bc6\u540e\uff0c\u63a5\u4e0b\u6765\u9700\u8981\u4ece\u5168\u5c40\u89d2\u5ea6\u5bf9Compaction\u8fdb\u884c\u4e86\u89e3\u3002\u6574\u4e2aCompaction\u59cb\u4e8e\u7279\u5b9a\u7684\u89e6\u53d1\u6761\u4ef6\uff0c\u6bd4\u5982flush\u64cd\u4f5c\u3001\u5468\u671f\u6027\u5730Compaction\u68c0\u67e5\u64cd\u4f5c\u7b49\u3002\u4e00\u65e6\u89e6\u53d1\uff0cHBase\u4f1a\u5c06\u8be5Compaction\u4ea4\u7531\u4e00\u4e2a\u72ec\u7acb\u7684\u7ebf\u7a0b\u5904\u7406\uff0c\u8be5\u7ebf\u7a0b\u9996\u5148\u4f1a\u4ece\u5bf9\u5e94store\u4e2d\u9009\u62e9\u5408\u9002\u7684hfile\u6587\u4ef6\u8fdb\u884c\u5408\u5e76\uff0c\u8fd9\u4e00\u6b65\u662f\u6574\u4e2aCompaction\u7684\u6838\u5fc3\uff0c\u9009\u53d6\u6587\u4ef6\u9700\u8981\u9075\u5faa\u5f88\u591a\u6761\u4ef6\uff0c\u6bd4\u5982\u6587\u4ef6\u6570\u4e0d\u80fd\u592a\u591a\u3001\u4e0d\u80fd\u592a\u5c11\u3001\u6587\u4ef6\u5927\u5c0f\u4e0d\u80fd\u592a\u5927\u7b49\u7b49\uff0c\u6700\u7406\u60f3\u7684\u60c5\u51b5\u662f\uff0c\u9009\u53d6\u90a3\u4e9b\u627f\u8f7dIO\u8d1f\u8f7d\u91cd\u3001\u6587\u4ef6\u5c0f\u7684\u6587\u4ef6\u96c6\uff0c\u5b9e\u9645\u5b9e\u73b0\u4e2d\uff0cHBase\u63d0\u4f9b\u4e86\u591a\u4e2a\u6587\u4ef6\u9009\u53d6\u7b97\u6cd5\uff1aRatioBasedCompactionPolicy\u3001ExploringCompactionPolicy\u548cStripeCompactionPolicy\u7b49\uff0c\u7528\u6237\u4e5f\u53ef\u4ee5\u901a\u8fc7\u7279\u5b9a\u63a5\u53e3\u5b9e\u73b0\u81ea\u5df1\u7684Compaction\u7b97\u6cd5\uff1b\u9009\u51fa\u5f85\u5408\u5e76\u7684\u6587\u4ef6\u540e\uff0cHBase\u4f1a\u6839\u636e\u8fd9\u4e9bhfile\u6587\u4ef6\u603b\u5927\u5c0f\u6311\u9009\u5bf9\u5e94\u7684\u7ebf\u7a0b\u6c60\u5904\u7406\uff0c\u6700\u540e\u5bf9\u8fd9\u4e9b\u6587\u4ef6\u6267\u884c\u5177\u4f53\u7684\u5408\u5e76\u64cd\u4f5c\u3002\u53ef\u4ee5\u901a\u8fc7\u4e0b\u56fe\u7b80\u5355\u5730\u68b3\u7406\u4e0a\u8ff0\u6d41\u7a0b\uff1a<\/p>\n<div>\n<div>\n<div><\/div>\n<div data-width=\\\"574\\\" data-height=\\\"237\\\"><img src=\\\"https:\/\/upload-images.jianshu.io\/upload_images\/13873072-24a424c136b4b42f.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/574\/format\/webp\\\" data-original-src=\\\"\/\/upload-images.jianshu.io\/upload_images\/13873072-24a424c136b4b42f.png\\\" data-original-width=\\\"574\\\" data-original-height=\\\"237\\\" data-original-format=\\\"image\/png\\\" data-original-filesize=\\\"26849\\\" data-image-index=\\\"4\\\" \/><\/div>\n<\/div>\n<div><\/div>\n<\/div>\n<h4>\u9009\u62e9\u5408\u9002HFile\u5408\u5e76<\/h4>\n<p>\u9009\u62e9\u5408\u9002\u7684\u6587\u4ef6\u8fdb\u884c\u5408\u5e76\u662f\u6574\u4e2acompaction\u7684\u6838\u5fc3\uff0c\u56e0\u4e3a\u5408\u5e76\u6587\u4ef6\u7684\u5927\u5c0f\u4ee5\u53ca\u5176\u5f53\u524d\u627f\u8f7d\u7684IO\u6570\u76f4\u63a5\u51b3\u5b9a\u4e86compaction\u7684\u6548\u679c\u3002\u6700\u7406\u60f3\u7684\u60c5\u51b5\u662f\uff0c\u8fd9\u4e9b\u6587\u4ef6\u627f\u8f7d\u4e86\u5927\u91cfIO\u8bf7\u6c42\u4f46\u662f\u5927\u5c0f\u5f88\u5c0f\uff0c\u8fd9\u6837compaction\u672c\u8eab\u4e0d\u4f1a\u6d88\u8017\u592a\u591aIO\uff0c\u800c\u4e14\u5408\u5e76\u5b8c\u6210\u4e4b\u540e\u5bf9\u8bfb\u7684\u6027\u80fd\u4f1a\u6709\u663e\u8457\u63d0\u5347\u3002\u7136\u800c\u73b0\u5b9e\u60c5\u51b5\u53ef\u80fd\u5927\u90e8\u5206\u90fd\u4e0d\u4f1a\u662f\u8fd9\u6837\uff0c\u57280.96\u7248\u672c\u548c0.98\u7248\u672c\uff0c\u5206\u522b\u63d0\u51fa\u4e86\u4e24\u79cd\u9009\u62e9\u7b56\u7565\uff0c\u5728\u5145\u5206\u8003\u8651\u6574\u4f53\u60c5\u51b5\u7684\u57fa\u7840\u4e0a\u9009\u62e9\u6700\u4f73\u65b9\u6848\u3002\u65e0\u8bba\u54ea\u79cd\u9009\u62e9\u7b56\u7565\uff0c\u90fd\u4f1a\u9996\u5148\u5bf9\u8be5Store\u4e2d\u6240\u6709HFile\u8fdb\u884c\u4e00\u4e00\u6392\u67e5\uff0c\u6392\u9664\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u90e8\u5206\u6587\u4ef6\uff1a<\/p>\n<ol>\n<li>\u6392\u9664\u5f53\u524d\u6b63\u5728\u6267\u884ccompact\u7684\u6587\u4ef6\u53ca\u5176\u6bd4\u8fd9\u4e9b\u6587\u4ef6\u66f4\u65b0\u7684\u6240\u6709\u6587\u4ef6\uff08SequenceId\u66f4\u5927\uff09<\/li>\n<li>\u6392\u9664\u67d0\u4e9b\u8fc7\u5927\u7684\u5355\u4e2a\u6587\u4ef6\uff0c\u5982\u679c\u6587\u4ef6\u5927\u5c0f\u5927\u4e8ehbase.hzstore.compaction.max.size\uff08\u9ed8\u8ba4Long\u6700\u5927\u503c\uff09\uff0c\u5219\u88ab\u6392\u9664\uff0c\u5426\u5219\u4f1a\u4ea7\u751f\u5927\u91cfIO\u6d88\u8017<\/li>\n<\/ol>\n<p>\u7ecf\u8fc7\u6392\u9664\u7684\u6587\u4ef6\u79f0\u4e3a\u5019\u9009\u6587\u4ef6\uff0cHBase\u63a5\u4e0b\u6765\u4f1a\u518d\u5224\u65ad\u662f\u5426\u6ee1\u8db3major compaction\u6761\u4ef6\uff0c\u5982\u679c\u6ee1\u8db3\uff0c\u5c31\u4f1a\u9009\u62e9\u5168\u90e8\u6587\u4ef6\u8fdb\u884c\u5408\u5e76\u3002\u5224\u65ad\u6761\u4ef6\u6709\u4e0b\u9762\u4e09\u6761\uff0c\u53ea\u8981\u6ee1\u8db3\u5176\u4e2d\u4e00\u6761\u5c31\u4f1a\u6267\u884cmajor compaction\uff1a<\/p>\n<ol>\n<li>\u7528\u6237\u5f3a\u5236\u6267\u884cmajor compaction<\/li>\n<li>\u957f\u65f6\u95f4\u6ca1\u6709\u8fdb\u884ccompact\uff08CompactionChecker\u7684\u5224\u65ad\u6761\u4ef62\uff09\u4e14\u5019\u9009\u6587\u4ef6\u6570\u5c0f\u4e8ehbase.hstore.compaction.max\uff08\u9ed8\u8ba410\uff09<\/li>\n<li>Store\u4e2d\u542b\u6709Reference\u6587\u4ef6\uff0cReference\u6587\u4ef6\u662fsplit region\u4ea7\u751f\u7684\u4e34\u65f6\u6587\u4ef6\uff0c\u53ea\u662f\u7b80\u5355\u7684\u5f15\u7528\u6587\u4ef6\uff0c\u4e00\u822c\u5fc5\u987b\u5728compact\u8fc7\u7a0b\u4e2d\u5220\u9664<\/li>\n<\/ol>\n<p>\u5982\u679c\u4e0d\u6ee1\u8db3major compaction\u6761\u4ef6\uff0c\u5c31\u5fc5\u7136\u4e3aminor compaction\uff0cHBase\u4e3b\u8981\u6709\u4e24\u79cdminor\u7b56\u7565\uff1aRatioBasedCompactionPolicy\u548cExploringCompactionPolicy\uff0c\u4e0b\u9762\u5206\u522b\u8fdb\u884c\u4ecb\u7ecd\uff1a<br \/>\nRatioBasedCompactionPolicy<br \/>\n\u4ece\u8001\u5230\u65b0\u9010\u4e00\u626b\u63cf\u6240\u6709\u5019\u9009\u6587\u4ef6\uff0c\u6ee1\u8db3\u5176\u4e2d\u6761\u4ef6\u4e4b\u4e00\u4fbf\u505c\u6b62\u626b\u63cf\uff1a<br \/>\n\uff081\uff09\u5f53\u524d\u6587\u4ef6\u5927\u5c0f &lt; \u6bd4\u5b83\u66f4\u65b0\u7684\u6240\u6709\u6587\u4ef6\u5927\u5c0f\u603b\u548c * ratio\uff0c\u5176\u4e2dratio\u662f\u4e00\u4e2a\u53ef\u53d8\u7684\u6bd4\u4f8b\uff0c\u5728\u9ad8\u5cf0\u671f\u65f6ratio\u4e3a1.2\uff0c\u975e\u9ad8\u5cf0\u671f\u4e3a5\uff0c\u4e5f\u5c31\u662f\u975e\u9ad8\u5cf0\u671f\u5141\u8bb8compact\u66f4\u5927\u7684\u6587\u4ef6\u3002\u90a3\u4ec0\u4e48\u65f6\u5019\u662f\u9ad8\u5cf0\u671f\uff0c\u4ec0\u4e48\u65f6\u5019\u662f\u975e\u9ad8\u5cf0\u671f\u5462\uff1f\u7528\u6237\u53ef\u4ee5\u914d\u7f6e\u53c2\u6570hbase.offpeak.start.hour\u548chbase.offpeak.end.hour\u6765\u8bbe\u7f6e\u9ad8\u5cf0\u671f<br \/>\n\uff082\uff09\u5f53\u524d\u6240\u5269\u5019\u9009\u6587\u4ef6\u6570 &lt;= hbase.store.compaction.min\uff08\u9ed8\u8ba4\u4e3a3\uff09<br \/>\n\u505c\u6b62\u626b\u63cf\u540e\uff0c\u5f85\u5408\u5e76\u6587\u4ef6\u5c31\u9009\u62e9\u51fa\u6765\u4e86\uff0c\u5373\u4e3a\u5f53\u524d\u626b\u63cf\u6587\u4ef6+\u6bd4\u5b83\u66f4\u65b0\u7684\u6240\u6709\u6587\u4ef6<br \/>\nExploringCompactionPolicy<br \/>\n\u8be5\u7b56\u7565\u601d\u8def\u57fa\u672c\u548cRatioBasedCompactionPolicy\u76f8\u540c\uff0c\u4e0d\u540c\u7684\u662f\uff0cRatio\u7b56\u7565\u5728\u627e\u5230\u4e00\u4e2a\u5408\u9002\u7684\u6587\u4ef6\u96c6\u5408\u4e4b\u540e\u5c31\u505c\u6b62\u626b\u63cf\u4e86\uff0c\u800cExploring\u7b56\u7565\u4f1a\u8bb0\u5f55\u4e0b\u6240\u6709\u5408\u9002\u7684\u6587\u4ef6\u96c6\u5408\uff0c\u5e76\u5728\u8fd9\u4e9b\u6587\u4ef6\u96c6\u5408\u4e2d\u5bfb\u627e\u6700\u4f18\u89e3\u3002\u6700\u4f18\u89e3\u53ef\u4ee5\u7406\u89e3\u4e3a\uff1a\u5f85\u5408\u5e76\u6587\u4ef6\u6570\u6700\u591a\u6216\u8005\u5f85\u5408\u5e76\u6587\u4ef6\u6570\u76f8\u540c\u7684\u60c5\u51b5\u4e0b\u6587\u4ef6\u5927\u5c0f\u8f83\u5c0f\uff0c\u8fd9\u6837\u6709\u5229\u4e8e\u51cf\u5c11compaction\u5e26\u6765\u7684IO\u6d88\u8017\u3002\u5177\u4f53\u6d41\u7a0b\u6233<a href=\\\"http:\/\/my.oschina.net\/u\/220934\/blog\/363270\\\" target=\\\"_blank\\\" rel=\\\"nofollow noopener noreferrer\\\">\u8fd9\u91cc<\/a><br \/>\n\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cRatio\u7b56\u7565\u662f0.94\u7248\u672c\u7684\u9ed8\u8ba4\u7b56\u7565\uff0c\u800c0.96\u7248\u672c\u4e4b\u540e\u9ed8\u8ba4\u7b56\u7565\u5c31\u6362\u4e3a\u4e86Exploring\u7b56\u7565\uff0c\u5728cloudera\u535a\u6587<a href=\\\"http:\/\/blog.cloudera.com\/blog\/2013\/12\/what-are-hbase-compactions\/\\\" target=\\\"_blank\\\" rel=\\\"nofollow noopener noreferrer\\\">\u300awhat-are-hbase-compactions\u300b<\/a>\u4e2d\uff0c\u4f5c\u8005\u7ed9\u51fa\u4e86\u4e00\u4e2a\u4e24\u8005\u7684\u7b80\u5355\u6027\u80fd\u5bf9\u6bd4\uff0c\u57fa\u672c\u53ef\u4ee5\u770b\u51fa\u540e\u8005\u5728\u8282\u7701IO\u65b9\u9762\u4f1a\u670910%\u5de6\u53f3\u7684\u63d0\u5347\uff1a<\/p>\n<div>\n<div>\n<div><\/div>\n<div data-width=\\\"488\\\" data-height=\\\"486\\\"><img src=\\\"https:\/\/upload-images.jianshu.io\/upload_images\/13873072-c66a3ef162031ca9.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/488\/format\/webp\\\" data-original-src=\\\"\/\/upload-images.jianshu.io\/upload_images\/13873072-c66a3ef162031ca9.png\\\" data-original-width=\\\"488\\\" data-original-height=\\\"486\\\" data-original-format=\\\"image\/png\\\" data-original-filesize=\\\"30488\\\" data-image-index=\\\"5\\\" \/><\/div>\n<\/div>\n<div><\/div>\n<\/div>\n<p>\u622a\u6b62\u5230\u6b64\uff0cHBase\u57fa\u672c\u4e0a\u5c31\u9009\u62e9\u51fa\u6765\u4e86\u5f85\u5408\u5e76\u7684\u6587\u4ef6\u96c6\u5408\uff0c\u540e\u7eed\u901a\u8fc7\u6311\u9009\u5408\u9002\u7684\u5904\u7406\u7ebf\u7a0b\uff0c\u5c31\u4f1a\u5bf9\u8fd9\u4e9b\u6587\u4ef6\u8fdb\u884c\u771f\u6b63\u7684\u5408\u5e76 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