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HLog\uff1aHLog\u771f\u6b63sync\u5230HDFS\uff0c\u5728\u91ca\u653e\u884c\u9501\u4e4b\u540e\u6267\u884csync\u64cd\u4f5c\u662f\u4e3a\u4e86\u5c3d\u91cf\u51cf\u5c11\u6301\u9501\u65f6\u95f4\uff0c\u63d0\u5347\u5199\u6027\u80fd\u3002\u5982\u679cSync\u5931\u8d25\uff0c\u6267\u884c\u56de\u6eda\u64cd\u4f5c\u5c06memstore\u4e2d\u5df2\u7ecf\u5199\u5165\u7684\u6570\u636e\u79fb\u9664\u3002<br \/>\n\uff087\uff09\u7ed3\u675f\u5199\u4e8b\u52a1\uff1a\u6b64\u65f6\u8be5\u7ebf\u7a0b\u7684\u66f4\u65b0\u64cd\u4f5c\u624d\u4f1a\u5bf9\u5176\u4ed6\u8bfb\u8bf7\u6c42\u53ef\u89c1\uff0c\u66f4\u65b0\u624d\u5b9e\u9645\u751f\u6548\u3002\u5177\u4f53\u5206\u6790\u89c1\u6587\u7ae0<a href=\\\"http:\/\/hbasefly.com\/2017\/07\/26\/transaction-2\/\\\" target=\\\"_blank\\\" rel=\\\"nofollow noopener noreferrer\\\">\u300a<\/a><a href=\\\"http:\/\/hbasefly.com\/2017\/07\/26\/transaction-2\/\\\" target=\\\"_blank\\\" rel=\\\"nofollow noopener noreferrer\\\">\u6570\u636e\u5e93\u4e8b\u52a1\u7cfb\u5217\uff0dHBase\u884c\u7ea7\u4e8b\u52a1\u6a21\u578b\u300b<\/a><br \/>\n\uff088\uff09flush memstore\uff1a\u5f53\u5199\u7f13\u5b58\u6ee164M\u4e4b\u540e\uff0c\u4f1a\u542f\u52a8flush\u7ebf\u7a0b\u5c06\u6570\u636e\u5237\u65b0\u5230\u786c\u76d8\u3002\u5237\u65b0\u64cd\u4f5c\u6d89\u53ca\u5230HFile\u76f8\u5173\u7ed3\u6784\uff0c\u540e\u9762\u4f1a\u8be6\u7ec6\u5bf9\u6b64\u8fdb\u884c\u4ecb\u7ecd\u3002<br \/>\nRegionServer\u63a5\u6536\u5230\u5ba2\u6237\u7aef\u7684get\/scan\u8bf7\u6c42\u4e4b\u540e\uff0c\u5148\u540e\u505a\u4e86\u4e24\u4ef6\u4e8b\u60c5\uff1a\u6784\u5efascanner\u4f53\u7cfb\uff08\u5b9e\u9645\u4e0a\u5c31\u662f\u505a\u4e00\u4e9bscan\u524d\u7684\u51c6\u5907\u5de5\u4f5c\uff09\uff0c\u5728\u6b64\u4f53\u7cfb\u57fa\u7840\u4e0a\u4e00\u884c\u4e00\u884c\u68c0\u7d22\u3002\u4e3e\u4e2a\u4e0d\u592a\u5408\u9002\u4f46\u6613\u4e8e\u7406\u89e3\u7684\u4f8b\u5b50\uff0cscan\u6570\u636e\u5c31\u548c\u5f00\u53d1\u5546\u76d6\u623f\u4e00\u6837\uff0c\u4e5f\u662f\u5206\u6210\u4e24\u6b65\uff1a\u7ec4\u5efa\u65bd\u5de5\u961f\u4f53\u7cfb\uff0c\u660e\u786e\u6bcf\u4e2a\u5de5\u4eba\u7684\u804c\u8d23\uff1b\u4e00\u5c42\u4e00\u5c42\u76d6\u697c\u3002<\/p>\n<div>\n<div>\n<div><\/div>\n<div data-width=\\\"1800\\\" data-height=\\\"802\\\"><img src=\\\"https:\/\/upload-images.jianshu.io\/upload_images\/13873072-06b2f9850b31d342.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/1200\/format\/webp\\\" data-original-src=\\\"\/\/upload-images.jianshu.io\/upload_images\/13873072-06b2f9850b31d342.png\\\" data-original-width=\\\"1800\\\" data-original-height=\\\"802\\\" data-original-format=\\\"image\/png\\\" data-original-filesize=\\\"391213\\\" data-image-index=\\\"4\\\" \/><\/div>\n<\/div>\n<div><\/div>\n<\/div>\n<h3>\u6784\u5efascanner\u4f53\u7cfb\uff0d\u7ec4\u5efa\u65bd\u5de5\u961f<\/h3>\n<p>scanner\u4f53\u7cfb\u7684\u6838\u5fc3\u5728\u4e8e\u4e09\u5c42scanner\uff1aRegionScanner\u3001StoreScanner\u4ee5\u53caStoreFileScanner\u3002\u4e09\u8005\u662f\u5c42\u7ea7\u7684\u5173\u7cfb\uff0c\u4e00\u4e2aRegionScanner\u7531\u591a\u4e2aStoreScanner\u6784\u6210\uff0c\u4e00\u5f20\u8868\u7531\u591a\u4e2a\u5217\u65cf\u7ec4\u6210\uff0c\u5c31\u6709\u591a\u5c11\u4e2aStoreScanner\u8d1f\u8d23\u8be5\u5217\u65cf\u7684\u6570\u636e\u626b\u63cf\u3002\u4e00\u4e2aStoreScanner\u53c8\u662f\u7531\u591a\u4e2aStoreFileScanner\u7ec4\u6210\u3002\u6bcf\u4e2aStore\u7684\u6570\u636e\u7531\u5185\u5b58\u4e2d\u7684MemStore\u548c\u78c1\u76d8\u4e0a\u7684StoreFile\u6587\u4ef6\u7ec4\u6210\uff0c\u76f8\u5bf9\u5e94\u7684\uff0cStoreScanner\u5bf9\u8c61\u4f1a\u96c7\u4f63\u4e00\u4e2aMemStoreScanner\u548cN\u4e2aStoreFileScanner\u6765\u8fdb\u884c\u5b9e\u9645\u7684\u6570\u636e\u8bfb\u53d6\uff0c\u6bcf\u4e2aStoreFile\u6587\u4ef6\u5bf9\u5e94\u4e00\u4e2aStoreFileScanner\uff0c\u6ce8\u610f\uff1aStoreFileScanner\u548cMemstoreScanner\u662f\u6574\u4e2ascan\u7684\u6700\u7ec8\u6267\u884c\u8005\u3002<br \/>\n\u5bf9\u5e94\u4e8e\u5efa\u697c\u9879\u76ee\uff0c\u4e00\u680b\u697c\u901a\u5e38\u7531\u597d\u51e0\u4e2a\u5355\u5143\u697c\u6784\u6210\uff08\u6bcf\u4e2a\u5355\u5143\u697c\u5bf9\u5e94\u4e8e\u4e00\u4e2aStore\uff09\uff0c\u6bcf\u4e2a\u5355\u5143\u697c\u4f1a\u8bf7\u4e00\u4e2a\u76d1\u5de5\uff08StoreScanner\uff09\u8d1f\u8d23\u8be5\u5355\u5143\u697c\u7684\u5efa\u9020\u3002\u800c\u76d1\u5de5\u4e00\u822c\u4e0d\u505a\u5177\u4f53\u7684\u4e8b\u60c5\uff0c\u4ed6\u8d1f\u8d23\u62db\u52df\u5f88\u591a\u5de5\u4eba\uff08StoreFileScanner\uff09\uff0c\u8fd9\u4e9b\u5de5\u4eba\u624d\u662f\u5efa\u697c\u7684\u4e3b\u4f53\u3002\u4e0b\u56fe\u662f\u6574\u4e2a\u6784\u5efa\u6d41\u7a0b\u56fe\uff1a<\/p>\n<div>\n<div>\n<div><\/div>\n<div data-width=\\\"921\\\" data-height=\\\"869\\\"><img src=\\\"https:\/\/upload-images.jianshu.io\/upload_images\/13873072-8d779aeb99c485eb.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/921\/format\/webp\\\" data-original-src=\\\"\/\/upload-images.jianshu.io\/upload_images\/13873072-8d779aeb99c485eb.png\\\" data-original-width=\\\"921\\\" data-original-height=\\\"869\\\" data-original-format=\\\"image\/png\\\" data-original-filesize=\\\"100395\\\" data-image-index=\\\"5\\\" \/><\/div>\n<\/div>\n<div><\/div>\n<\/div>\n<ol>\n<li>RegionScanner\u4f1a\u6839\u636e\u5217\u65cf\u6784\u5efaStoreScanner\uff0c\u6709\u591a\u5c11\u5217\u65cf\u5c31\u6784\u5efa\u591a\u5c11StoreScanner\uff0c\u7528\u4e8e\u8d1f\u8d23\u8be5\u5217\u65cf\u7684\u6570\u636e\u68c0\u7d22<\/li>\n<\/ol>\n<p>1.1 \u6784\u5efaStoreFileScanner\uff1a\u6bcf\u4e2aStoreScanner\u4f1a\u4e3a\u5f53\u524d\u8be5Store\u4e2d\u6bcf\u4e2aHFile\u6784\u9020\u4e00\u4e2aStoreFileScanner\uff0c\u7528\u4e8e\u5b9e\u9645\u6267\u884c\u5bf9\u5e94\u6587\u4ef6\u7684\u68c0\u7d22\u3002\u540c\u65f6\u4f1a\u4e3a\u5bf9\u5e94Memstore\u6784\u9020\u4e00\u4e2aMemstoreScanner\uff0c\u7528\u4e8e\u6267\u884c\u8be5Store\u4e2dMemstore\u7684\u6570\u636e\u68c0\u7d22\u3002\u8be5\u6b65\u9aa4\u5bf9\u5e94\u4e8e\u76d1\u5de5\u5728\u4eba\u624d\u5e02\u573a\u62db\u52df\u5efa\u697c\u6240\u9700\u7684\u5404\u79cd\u7c7b\u578b\u5de5\u5320\u3002<br \/>\n1.2 \u8fc7\u6ee4\u6dd8\u6c70StoreFileScanner\uff1a\u6839\u636eTime Range\u4ee5\u53caRowKey Range\u5bf9StoreFileScanner\u4ee5\u53caMemstoreScanner\u8fdb\u884c\u8fc7\u6ee4\uff0c\u6dd8\u6c70\u80af\u5b9a\u4e0d\u5b58\u5728\u5f85\u68c0\u7d22\u7ed3\u679c\u7684Scanner\u3002\u4e0a\u56fe\u4e2dStoreFile3\u56e0\u4e3a\u68c0\u67e5RowKeyRange\u4e0d\u5b58\u5728\u5f85\u68c0\u7d22Rowkey\u6240\u4ee5\u88ab\u6dd8\u6c70\u3002\u8be5\u6b65\u9aa4\u9488\u5bf9\u5177\u4f53\u7684\u5efa\u697c\u65b9\u6848\uff0c\u88c1\u64a4\u6389\u90e8\u5206\u4e0d\u9700\u8981\u7684\u5de5\u5320\uff0c\u6bd4\u5982\u8fd9\u680b\u697c\u4e0d\u9700\u8981\u5730\u6696\u5b89\u88c5\uff0c\u5bf9\u5e94\u7684\u5de5\u5320\u5c31\u53ef\u4ee5\u64a4\u6389\u3002<br \/>\n1.3 Seek rowkey\uff1a\u6240\u6709StoreFileScanner\u5f00\u59cb\u505a\u51c6\u5907\u5de5\u4f5c\uff0c\u5728\u8d1f\u8d23\u7684HFile\u4e2d\u5b9a\u4f4d\u5230\u6ee1\u8db3\u6761\u4ef6\u7684\u8d77\u59cbRow\u3002\u5de5\u5320\u4e5f\u5f00\u59cb\u51c6\u5907\u81ea\u5df1\u7684\u5efa\u9020\u5de5\u5177\uff0c\u5efa\u9020\u6750\u6599\uff0c\u627e\u5230\u81ea\u5df1\u7684\u5de5\u4f5c\u5730\u70b9\uff0c\u7b49\u5f85\u4e00\u58f0\u547d\u4e0b\u3002\u5c31\u50cf\u6240\u6709\u91cd\u8981\u9879\u76ee\u7684\u51c6\u5907\u5de5\u4f5c\u90fd\u5f88\u6838\u5fc3\u4e00\u6837\uff0cSeek\u8fc7\u7a0b\uff08\u6b64\u5904\u7565\u8fc7Lazy Seek\u4f18\u5316\uff09\u4e5f\u662f\u4e00\u4e2a\u5f88\u6838\u5fc3\u7684\u6b65\u9aa4\uff0c\u5b83\u4e3b\u8981\u5305\u542b\u4e0b\u9762\u4e09\u6b65\uff1a<\/p>\n<ul>\n<li>\u5b9a\u4f4dBlock Offset\uff1a\u5728Blockcache\u4e2d\u8bfb\u53d6\u8be5HFile\u7684\u7d22\u5f15\u6811\u7ed3\u6784\uff0c\u6839\u636e\u7d22\u5f15\u6811\u68c0\u7d22\u5bf9\u5e94RowKey\u6240\u5728\u7684Block Offset\u548cBlock Size<\/li>\n<li>Load Block\uff1a\u6839\u636eBlockOffset\u9996\u5148\u5728BlockCache\u4e2d\u67e5\u627eData Block\uff0c\u5982\u679c\u4e0d\u5728\u7f13\u5b58\uff0c\u518d\u5728HFile\u4e2d\u52a0\u8f7d<\/li>\n<li>Seek Key\uff1a\u5728Data Block\u5185\u90e8\u901a\u8fc7\u4e8c\u5206\u67e5\u627e\u7684\u65b9\u5f0f\u5b9a\u4f4d\u5177\u4f53\u7684RowKey<\/li>\n<\/ul>\n<p>\u6574\u4f53\u6d41\u7a0b\u7ec6\u8282\u53c2\u89c1<a href=\\\"http:\/\/hbasefly.com\/2016\/04\/03\/hbase_hfile_index\/\\\" target=\\\"_blank\\\" rel=\\\"nofollow noopener noreferrer\\\">\u300aHBase\u539f\u7406-\u63a2\u7d22HFile\u7d22\u5f15\u673a\u5236\u300b<\/a>\uff0c\u6587\u4e2d\u8be6\u7ec6\u8bf4\u660e\u4e86HFile\u7d22\u5f15\u7ed3\u6784\u4ee5\u53ca\u5982\u4f55\u901a\u8fc7\u7d22\u5f15\u7ed3\u6784\u5b9a\u4f4d\u5177\u4f53\u7684Block\u4ee5\u53caRowKey<br \/>\n1.4 StoreFileScanner\u5408\u5e76\u6784\u5efa\u6700\u5c0f\u5806\uff1a\u5c06\u8be5Store\u4e2d\u6240\u6709StoreFileScanner\u548cMemstoreScanner\u5408\u5e76\u5f62\u6210\u4e00\u4e2aheap\uff08\u6700\u5c0f\u5806\uff09\uff0c\u6240\u8c13heap\u662f\u4e00\u4e2a\u4f18\u5148\u7ea7\u961f\u5217\uff0c\u961f\u5217\u4e2d\u5143\u7d20\u662f\u6240\u6709scanner\uff0c\u6392\u5e8f\u89c4\u5219\u6309\u7167scanner seek\u5230\u7684keyvalue\u5927\u5c0f\u7531\u5c0f\u5230\u5927\u8fdb\u884c\u6392\u5e8f\u3002\u8fd9\u91cc\u9700\u8981\u91cd\u70b9\u5173\u6ce8\u4e09\u4e2a\u95ee\u9898\uff0c\u9996\u5148\u4e3a\u4ec0\u4e48\u8fd9\u4e9bScanner\u9700\u8981\u7531\u5c0f\u5230\u5927\u6392\u5e8f\uff0c\u5176\u6b21keyvalue\u662f\u4ec0\u4e48\u6837\u7684\u7ed3\u6784\uff0c\u6700\u540e\uff0ckeyvalue\u8c01\u5927\u8c01\u5c0f\u662f\u5982\u4f55\u786e\u5b9a\u7684\uff1a<\/p>\n<ul>\n<li>\u4e3a\u4ec0\u4e48\u8fd9\u4e9bScanner\u9700\u8981\u7531\u5c0f\u5230\u5927\u6392\u5e8f\uff1f<\/li>\n<\/ul>\n<p>\u6700\u76f4\u63a5\u7684\u89e3\u91ca\u662fscan\u7684\u7ed3\u679c\u9700\u8981\u7531\u5c0f\u5230\u5927\u8f93\u51fa\u7ed9\u7528\u6237\uff0c\u5f53\u7136\uff0c\u8fd9\u5e76\u4e0d\u5168\u9762\uff0c\u6700\u5408\u7406\u7684\u89e3\u91ca\u662f\u53ea\u6709\u7531\u5c0f\u5230\u5927\u6392\u5e8f\u624d\u80fd\u4f7f\u5f97scan\u6548\u7387\u6700\u9ad8\u3002\u4e3e\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0cHBase\u652f\u6301\u6570\u636e\u591a\u7248\u672c\uff0c\u5047\u8bbe\u7528\u6237\u53ea\u60f3\u83b7\u53d6\u6700\u65b0\u7248\u672c\uff0c\u90a3\u53ea\u9700\u8981\u5c06\u8fd9\u4e9b\u6570\u636e\u7531\u6700\u65b0\u5230\u6700\u65e7\u8fdb\u884c\u6392\u5e8f\uff0c\u7136\u540e\u53d6\u961f\u9996\u5143\u7d20\u8fd4\u56de\u5c31\u53ef\u4ee5\u3002\u90a3\u4e48\uff0c\u5982\u679c\u4e0d\u6392\u5e8f\uff0c\u5c31\u53ea\u80fd\u904d\u5386\u6240\u6709\u5143\u7d20\uff0c\u67e5\u770b\u7b26\u4e0d\u7b26\u5408\u7528\u6237\u67e5\u8be2\u6761\u4ef6\u3002\u8fd9\u5c31\u662f\u6392\u961f\u7684\u610f\u4e49\u3002<br \/>\n\u5de5\u5320\u4eec\u4e5f\u9700\u8981\u6392\u5e8f\uff0c\u5148\u505a\u5730\u677f\u7684\u6392\u524d\u9762\uff0c\u505a\u5899\u4f53\u7684\u6b21\u4e4b\uff0c\u6700\u540e\u662f\u505a\u95e8\u7a97\u6237\u7684\u3002\u505a\u5899\u4f53\u7684\u5185\u90e8\u8fd8\u9700\u8981\u518d\u6392\u5e8f\uff0c\u505a\u5185\u5899\u7684\u6392\u524d\u9762\uff0c\u505a\u5916\u5899\u7684\u6392\u540e\u9762\uff0c\u8fd9\u6837\uff0c\u5047\u5982\u8bbe\u8ba1\u5e08\u4e34\u65f6\u51b3\u5b9a\u4e0d\u505a\u5916\u5899\u7684\u8bdd\uff0c\u5c31\u53ef\u4ee5\u76f4\u63a5\u8df3\u8fc7\u5916\u5899\u90e8\u5206\u5de5\u4f5c\u3002\u5f88\u663e\u7136\uff0c\u5982\u679c\u4e0d\u6392\u5e8f\u7684\u8bdd\uff0c\u662f\u6ca1\u529e\u6cd5\u4e34\u65f6\u505a\u51b3\u5b9a\u7684\uff0c\u56e0\u4e3a\u8fd9\u90e8\u5206\u5de5\u4f5c\u5df2\u7ecf\u53ef\u80fd\u505a\u6389\u4e86\u3002<\/p>\n<ul>\n<li>HBase\u4e2dKeyValue\u662f\u4ec0\u4e48\u6837\u7684\u7ed3\u6784\uff1f<\/li>\n<\/ul>\n<p>HBase\u4e2dKeyValue\u5e76\u4e0d\u662f\u7b80\u5355\u7684KV\u6570\u636e\u5bf9\uff0c\u800c\u662f\u4e00\u4e2a\u5177\u6709\u590d\u6742\u5143\u7d20\u7684\u7ed3\u6784\u4f53\uff0c\u5176\u4e2dKey\u7531RowKey\uff0cColumnFamily\uff0cQualifier 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\/><\/div>\n<\/div>\n<div><\/div>\n<\/div>\n<p>\u4e86\u89e3\u4e86KeyValue\u7684\u903b\u8f91\u7ed3\u6784\u540e\uff0c\u6211\u4eec\u4e0d\u59a8\u518d\u8fdb\u4e00\u6b65\u4ece\u539f\u7406\u7684\u89d2\u5ea6\u60f3\u60f3HBase\u7684\u5f00\u53d1\u8005\u4eec\u4e3a\u4ec0\u4e48\u5982\u6b64\u5bf9\u5176\u8bbe\u8ba1\u3002\u8fd9\u4e2a\u5c31\u5f97\u4eceHBase\u6240\u652f\u6301\u7684\u6570\u636e\u64cd\u4f5c\u8bf4\u8d77\u4e86\uff0cHBase\u652f\u6301\u56db\u79cd\u4e3b\u8981\u7684\u6570\u636e\u64cd\u4f5c\uff0c\u5206\u522b\u662fGet\/Scan\/Put\/Delete\uff0c\u5176\u4e2dGet\u548cScan\u4ee3\u8868\u6570\u636e\u67e5\u8be2\uff0cPut\u64cd\u4f5c\u4ee3\u8868\u6570\u636e\u63d2\u5165\u6216\u66f4\u65b0\uff08\u5982\u679cPut\u7684RowKey\u4e0d\u5b58\u5728\u5219\u4e3a\u63d2\u5165\u64cd\u4f5c\u3001\u5426\u5219\u4e3a\u66f4\u65b0\u64cd\u4f5c\uff09\uff0c\u7279\u522b\u9700\u8981\u6ce8\u610f\u7684\u662fHBase\u4e2d\u66f4\u65b0\u64cd\u4f5c\u5e76\u4e0d\u662f\u76f4\u63a5\u8986\u76d6\u4fee\u6539\u539f\u6570\u636e\uff0c\u800c\u662f\u751f\u6210\u65b0\u7684\u6570\u636e\uff0c\u65b0\u6570\u636e\u548c\u539f\u6570\u636e\u5177\u6709\u4e0d\u540c\u7684\u7248\u672c\uff08\u65f6\u95f4\u6233\uff09\uff1bDelete\u64cd\u4f5c\u6267\u884c\u6570\u636e\u5220\u9664\uff0c\u548c\u6570\u636e\u66f4\u65b0\u64cd\u4f5c\u76f8\u540c\uff0cHBase\u6267\u884c\u6570\u636e\u5220\u9664\u5e76\u4e0d\u4f1a\u9a6c\u4e0a\u5c06\u6570\u636e\u4ece\u6570\u636e\u5e93\u4e2d\u6c38\u4e45\u5220\u9664\uff0c\u800c\u53ea\u662f\u751f\u6210\u4e00\u6761\u5220\u9664\u8bb0\u5f55\uff0c\u6700\u540e\u5728\u7cfb\u7edf\u6267\u884c\u6587\u4ef6\u5408\u5e76\u7684\u65f6\u5019\u518d\u7edf\u4e00\u5220\u9664\u3002<br \/>\nHBase\u4e2d\u66f4\u65b0\u5220\u9664\u64cd\u4f5c\u5e76\u4e0d\u76f4\u63a5\u64cd\u4f5c\u539f\u6570\u636e\uff0c\u800c\u662f\u751f\u6210\u4e00\u4e2a\u65b0\u7eaa\u5f55\uff0c\u90a3\u95ee\u9898\u6765\u4e86\uff0c\u5982\u4f55\u77e5\u9053\u4e00\u6761\u8bb0\u5f55\u5230\u5e95\u662f\u63d2\u5165\u64cd\u4f5c\u8fd8\u662f\u66f4\u65b0\u64cd\u4f5c\u4ea6\u6216\u662f\u5220\u9664\u64cd\u4f5c\u5462\uff1f\u8fd9\u6b63\u662fKeyType\u548cTimestamp\u7684\u7528\u6b66\u4e4b\u5730\u3002\u4e0a\u6587\u4e2d\u63d0\u5230KeyType\u53d6\u503c\u4e3a\u5206\u522b\u4e3aPut\/Delete\/Delete Column\/Delete 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\/>\n\u5bf9\u4e8e\u4e00\u884c\u6570\u636e\u7684\u67e5\u8be2\uff0c\u53c8\u53ef\u4ee5\u5206\u89e3\u4e3a\u591a\u4e2a\u5217\u65cf\u7684\u67e5\u8be2\uff0c\u6bd4\u5982RowKey=row1\u7684\u4e00\u884c\u6570\u636e\u67e5\u8be2\uff0c\u9996\u5148\u67e5\u8be2\u5217\u65cf1\u4e0a\u8be5\u884c\u7684\u6570\u636e\u96c6\u5408\uff0c\u518d\u67e5\u8be2\u5217\u65cf2\u91cc\u8be5\u884c\u7684\u6570\u636e\u96c6\u5408\u3002\u540c\u6837\u662f\u76d6\u7b2c\u4e00\u5c42\u623f\u5b50\uff0c\u5148\u76d6\u4e00\u5355\u5143\u7684\u4e00\u5c42\uff0c\u518d\u6539\u4e8c\u5355\u5143\u7684\u4e00\u5c42\uff0c\u76d6\u5b8c\u4e4b\u540e\u624d\u7b97\u4e00\u5c42\u76d6\u5b8c\uff0c\u63a5\u7740\u5f00\u59cb\u76d6\u7b2c\u4e8c\u5c42\u3002\u6240\u4ee5\u6211\u4eec\u4e5f\u53ea\u9700\u8981\u5173\u6ce8\u67d0\u4e00\u884c\u67d0\u4e2a\u5217\u65cf\u7684\u6570\u636e\u662f\u5982\u4f55\u67e5\u8be2\u7684\u5c31\u53ef\u4ee5\u3002<br \/>\n\u8fd8\u8bb0\u5f97Scanner\u4f53\u7cfb\u6784\u5efa\u7684\u6700\u7ec8\u7ed3\u679c\u662f\u4e00\u4e2a\u7531StoreFileScanner\u548cMemstoreScanner\u7ec4\u6210\u7684heap\uff08\u6700\u5c0f\u5806\uff09\u4e48\uff0c\u8fd9\u91cc\u5c31\u6d3e\u4e0a\u7528\u573a\u4e86\u3002\u4e0b\u56fe\u662f\u4e00\u5f20\u8868\u7684\u903b\u8f91\u89c6\u56fe\uff0c\u8be5\u8868\u6709\u4e24\u4e2a\u5217\u65cfcf1\u548ccf2\uff08\u6211\u4eec\u53ea\u5173\u6ce8cf1\uff09\uff0ccf1\u53ea\u6709\u4e00\u4e2a\u5217name\uff0c\u8868\u4e2d\u67095\u884c\u6570\u636e\uff0c\u5176\u4e2d\u6bcf\u4e2acell\u57fa\u672c\u90fd\u6709\u591a\u4e2a\u7248\u672c\u3002cf1\u7684\u6570\u636e\u5047\u5982\u5b9e\u9645\u5b58\u50a8\u5728\u4e09\u4e2a\u533a\u57df\uff0cmemstore\u4e2d\u6709r2\u548cr4\u7684\u6700\u65b0\u6570\u636e\uff0chfile1\u4e2d\u662f\u6700\u65e9\u7684\u6570\u636e\u3002\u73b0\u5728\u9700\u8981\u67e5\u8be2RowKey=r2\u7684\u6570\u636e\uff0c\u6309\u7167\u4e0a\u6587\u7684\u7406\u8bba\u5bf9\u5e94\u7684Scanner\u6307\u5411\u5c31\u5982\u56fe\u6240\u793a\uff1a<\/p>\n<div>\n<div>\n<div><\/div>\n<div data-width=\\\"975\\\" data-height=\\\"588\\\"><img src=\\\"https:\/\/upload-images.jianshu.io\/upload_images\/13873072-05140c868191da41.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/975\/format\/webp\\\" data-original-src=\\\"\/\/upload-images.jianshu.io\/upload_images\/13873072-05140c868191da41.png\\\" data-original-width=\\\"975\\\" data-original-height=\\\"588\\\" data-original-format=\\\"image\/png\\\" data-original-filesize=\\\"90366\\\" data-image-index=\\\"7\\\" \/><\/div>\n<\/div>\n<div><\/div>\n<\/div>\n<p>\u8fd9\u4e09\u4e2aScanner\u7ec4\u6210\u7684heap\u4e3a&lt;MemstoreScanner\uff0cStoreFileScanner2, StoreFileScanner1&gt;\uff0cScanner\u7531\u5c0f\u5230\u5927\u6392\u5217\u3002\u67e5\u8be2\u7684\u65f6\u5019\u9996\u5148pop\u51faheap\u7684\u5806\u9876\u5143\u7d20\uff0c\u5373MemstoreScanner\uff0c\u5f97\u5230keyvalue = 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