{"id":2670,"date":"2019-01-10T15:05:31","date_gmt":"2019-01-10T07:05:31","guid":{"rendered":"https:\/\/damogame.cn:15443\/wordpress\/?p=2670"},"modified":"2019-01-10T15:05:31","modified_gmt":"2019-01-10T07:05:31","slug":"rocksdb-share","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/2670","title":{"rendered":"rocksdb-share"},"content":{"rendered":"<div class=\"show-content\" data-note-content=\"\">\n<div class=\"show-content-free\">\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-view\" data-width=\"312\" data-height=\"247\">\u6700\u8fd1\u9879\u76ee\u4e2d\u7528\u5230\u8fd9\u4e2anb\u7684\u73a9\u610f\uff0c\u6240\u4ee5\u5c31\u82b1\u65f6\u95f4\u7814\u7a76\u4e86\u4e0b\uff0c\u540c\u65f6\u6574\u7406\u4e0b\u52a9\u81ea\u5df1\u8bb0\u5fc6\u3002\u8fd9\u4e2a\u731b\u864e\u4e0a\u5c71\u7684logo\u5c31\u662frocksdb\u5b98\u65b9\u7684logo\u3002 \u540c\u65f6\u501f\u7528\u5b98\u7f51\u7684\u4e00\u53e5\u8bdd\u6765\u7efc\u8ff0\u4e0b\uff1a \u4e00\u4e2a\u6301\u4e45\u6027\u7684key-value\u5b58\u50a8\uff0c\u4e3a\u4e86\u66f4\u5feb\u901f\u7684\u5b58\u50a8\u73af\u5883\u800c\u751f\u3002<\/div>\n<\/div>\n<\/div>\n<h2>rocks\u7279\u6027<\/h2>\n<p>rocksdb\u662f\u4e00\u4e2a\u53ef\u5d4c\u5165\u7684C++\u5e93\uff0c \u53ef\u7528\u4e8e\u5b58\u50a8\u4efb\u610f\u5927\u5c0f\u5b57\u8282\u6d41\u7684key, value \u7ed3\u6784\u3002\u652f\u6301\u7684\u65b9\u6cd5\u6709Put, Get, Delete, \u4f20\u7edf\u7684\u6570\u636e\u5e93\u7684\u5e38\u7528\u65b9\u6cd5CRUD.\u5176\u4e2dupdate\u8fd9\u4e2a\u65b9\u6cd5\u5bf9rocksdb\u6765\u8bf4\u4e5f\u662f\u4e00\u79cdPut\u65b9\u6cd5\u3002\u540c\u65f6\u56e0\u4e3arocksdb\u662f\u6309key\u7684\u987a\u5e8f\u5b58\u50a8\u6570\u636e\uff0c\u6240\u4ee5\u8fd8\u652f\u6301Iterator\u8fed\u4ee3\u7684\u65b9\u6cd5\uff0c\u5373\u5c31\u662f\u5b9a\u4f4d\u5230\u6570\u636e\u5e93\u4e2d\u7684\u4e00\u4e2akey\u540e\uff0c\u53ef\u4ee5\u4ece\u8fd9\u4e2akey\u5f00\u59cb\u6b63\u5411\u7684\u626b\u63cf\uff0c\u4e5f\u53ef\u4ee5\u9006\u5411\u7684\u626b\u63cf\u3002\u540c\u65f6\u652f\u6301PrefixExtractor\u524d\u7f00\u8fed\u4ee3\uff0c\u5047\u8bbe\u6211\u4eec\u5b58\u50a8\u7684key\u670920\u4f4d\uff0c\u524d10\u4f4d\u4e3a\u65f6\u95f4\u4fe1\u606f\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u524d\u7f00\u8fed\u4ee3\u628a\u67d0\u4e2a\u65f6\u95f4\u6bb5\u7684\u6570\u636e\u62c9\u51fa\u6765\uff0c\u8fd9\u4e2a\u9700\u8981\u6211\u4eec\u5728\u521b\u5efa\u6570\u636e\u5e93\u65f6\u914d\u7f6ePrefixExtractor\u7684\u4f4d\u6570\u4e3a10\uff0c\u9ed8\u8ba4\u662f0\u3002\u540c\u65f6rocksdb\u652f\u6301\u5feb\u7167Snapshot, \u6bcf\u6b21\u4ee5\u53ea\u8bfb\u65b9\u5f0fGet\u6570\u636e\u65f6\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u5feb\u7167\uff0c\u5728\u8fd9\u4e2a\u65f6\u95f4\u70b9\u4e4b\u524d\u7684\u6570\u636e\u5bf9Get\u53ef\u89c1\uff0c\u4e4b\u540e\u4e0d\u53ef\u89c1\u3002\u540c\u65f6rocksdb\u8fd8\u63d0\u4f9b\u4e00\u4e9b\u7528\u6237\u53ef\u5b9a\u4e49\u7684filter, \u6bd4\u5982\u63d0\u4f9bbloomfilter\u53ef\u4ee5\u4f18\u5316\u8bfb\u6027\u80fd\uff1b\u63d0\u4f9bDB\u7ea7\u522b\u7684ttlfilter, \u4f7f\u5f97\u8d85\u8fc7\u8fc7\u671f\u65f6\u95f4\u7684\u6570\u636e\u5728compaction\u8fc7\u7a0b\u4e2d\u88ab\u5220\u9664\u3002<\/p>\n<p>Rocksdb\u8fd8\u652f\u6301\u5199\u5165\u7684\u539f\u5b50\u6027\uff0c\u6570\u636e\u7684\u6301\u4e45\u5316\uff0c\u6570\u636e\u6821\u9a8c\uff0c\u6570\u636e\u538b\u7f29\uff0c\u6570\u636e\u5907\u4efd\uff0c\u6570\u636e\u7f13\u5b58\u7b49\u4e00\u4e9b\u7279\u6027\u3002<\/p>\n<h2>\u5199\u903b\u8f91<\/h2>\n<p>\u6211\u4eec\u4ece\u4e00\u6761\u6570\u636e\u5bf9\u5199\u5165\u6765\u4e86\u89e3rocksdb\u7684\u5b58\u50a8\u7ed3\u6784\u5427\u3002<\/p>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"591\" data-height=\"520\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/12866002-82c2cdc5a1ba80fe.jpg?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/591\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/12866002-82c2cdc5a1ba80fe.jpg\" data-original-width=\"591\" data-original-height=\"520\" data-original-format=\"image\/jpeg\" data-original-filesize=\"49424\" \/><\/div>\n<\/div>\n<\/div>\n<p>\u9996\u5148\u5f53\u4e00\u6761\u6570\u636e\u5199\u5165rocksdb\u65f6\uff0c \u4f1a\u5c06\u8fd9\u6761\u8bb0\u5f55\u5c01\u88c5\u6210\u4e00\u4e2abatch, \u4e5f\u53ef\u4ee5\u662f\u591a\u6761\u8bb0\u5f55\u4e00\u4e2abatch\uff0c\u7531batch\u6765\u4fdd\u8bc1\u539f\u5b50\u64cd\u4f5c\u3002\u5c31\u662f\u4e00\u4e2abatch\u91cc\u7684\u6570\u636e\u8981\u4e48\u5168\u90e8\u6210\u529f\u8981\u4e48\u5168\u90e8\u5931\u8d25\u3002<\/p>\n<p>\u7b2c\u4e00\u6b65\u5148\u4ee5\u65e5\u5fd7\u7684\u5f62\u5f0f\u843d\u5730\u78c1\u76d8\uff0c\u8bb0write ahead log, \u843d\u5730\u6210\u529f\u540e\u518d\u5199\u5165memtable\u3002\u8fd9\u91cc\u8bb0\u5f55wal\u7684\u539f\u56e0\u5c31\u662f\u9632\u6b62\u91cd\u542f\u65f6\u5185\u5b58\u4e2d\u7684\u6570\u636e\u4e22\u5931\u3002\u6240\u4ee5\u5728db\u91cd\u65b0\u6253\u5f00\u65f6\u4f1a\u5148\u4ecewal\u6062\u590d\u5185\u5b58\u4e2d\u7684mentable. \u53ef\u914d\u7f6eWAL\u4fdd\u5b58\u5728\u53ef\u9760\u7684\u5b58\u50a8\u91cc\u3002<\/p>\n<p>\u8fd9\u91cc\u7684memtable\u662f\u5728\u5185\u5b58\u4e2d\u7684\u4e00\u4e2a\u8df3\u8868\u7ed3\u6784\uff08skiplist\uff09\u3002\u6bcf\u4e00\u4e2a\u8282\u70b9\u90fd\u662f\u5b58\u50a8\u7740\u4e00\u4e2akey, value. \u8df3\u8868\u53ef\u4f7f\u67e5\u627e\u7684\u590d\u6742\u5ea6\u4e3alogn, \u540c\u65f6\u63d2\u5165\u6570\u636e\u975e\u5e38\u7b80\u5355\u3002\u6bcf\u4e2abatch\u72ec\u5360memtable\u7684\u5199\u9501\u3002\u8fd9\u4e2a\u662f\u4e3a\u4e86\u907f\u514d\u591a\u7ebf\u7a0b\u5199\u9020\u6210\u7684\u6570\u636e\u9519\u4e71\u3002<\/p>\n<p>\u5f53memtable\u7684\u6570\u636e\u5927\u5c0f\u8d85\u8fc7\u9608\u503c(write_buffer_size)\u540e\uff0c\u4f1a\u65b0\u751f\u6210\u4e00\u4e2amemtable\u7ee7\u7eed\u5199\uff0c\u5c06\u524d\u4e00\u4e2amemtable\u4fdd\u5b58\u4e3a\u53ea\u8bfbmemtable.<\/p>\n<p>\u5f53\u53ea\u8bfbmemtable\u7684\u6570\u91cf\u8d85\u8fc7\u9608\u503c\u540e\uff0c\u4f1a\u5c06\u6240\u6709\u7684\u53ea\u8bfbmemtable\u5408\u5e76\u5e76flush\u5230\u78c1\u76d8\u751f\u6210\u4e00\u4e2aSST\u6587\u4ef6\u3002\u8fd9\u91cc\u7684SST\u5c5e\u4e8elevel0, level0\u4e2d\u7684\u6bcf\u4e2aSST\u6709\u5e8f\uff0c\u6574\u4e2alevel0\u4e0d\u4e00\u5b9a\u6709\u5e8f\u3002<\/p>\n<p>\u5f53level0\u7684sst\u6587\u4ef6\u6570\u8d85\u8fc7\u9608\u503c\u6216\u8005\u603b\u5927\u5c0f\u8d85\u8fc7\u9608\u503c\uff0c\u4f1a\u89e6\u53d1compaction\u64cd\u4f5c\uff0c\u5c06level0\u4e2d\u7684\u6570\u636e\u5408\u5e76\u5230level1\u4e2d\u3002\u540c\u6837level1\u7684\u6587\u4ef6\u6570\u8d85\u8fc7\u9608\u503c\u6216\u8005\u603b\u5927\u5c0f\u8d85\u8fc7\u9608\u503c\uff0c\u4e5f\u4f1a\u89e6\u53d1compaction\u64cd\u4f5c\uff0c \u8fd9\u65f6\u5019\u968f\u673a\u9009\u62e9\u4e00\u4e2asst\u5408\u5e76\u5230\u66f4\u9ad8\u5c42\u7684level\u4e2d\u3002\u8fd9\u91cc\u6709\u4e24\u70b9\u6bd4\u8f83\u91cd\u8981\uff0c1\uff1alevel1 \u53ca\u5176\u4ee5\u4e0a\u7684level\u90fd\u6574\u4f53\u6709\u5e8f\u3002\u6bcf\u4e2asst\u5b58\u50a8\u4e00\u4e2a\u8303\u56f4\u7684\u6570\u636e\u4e92\u4e0d\u4ea4\u53c9\u4e92\u4e0d\u91cd\u5408\uff1b2: level1 \u4ee5\u4e0a\u7684 compaction\u64cd\u4f5c\u53ef\u4ee5\u591a\u7ebf\u7a0b\u6267\u884c\uff0c\u524d\u63d0\u662f\u6bcf\u4e2a\u7ebf\u7a0b\u6240\u64cd\u4f5c\u7684\u6570\u636e\u4e92\u4e0d\u4ea4\u53c9\u3002<\/p>\n<p>\u90a3\u4e48\u8fd9\u6837\u6570\u636e\u5c31\u7531\u5185\u5b58\u6d41\u5165\u5230\u9ad8\u5c42\u7684level\u3002\u6211\u4eec\u7406\u60f3\u72b6\u6001\u4e0b\uff0c\u6240\u6709\u7684\u6570\u636e\u90fd\u5b58\u5728\u975elevel0\u7684\u4e00\u5c42level\u4e0a\u3002\u8fd9\u6837\u53ef\u4ee5\u4fdd\u8bc1\u6700\u9ad8\u6548\u7684\u67e5\u8be2\u901f\u5ea6\u3002\u6240\u4ee5\u5bf9rocksdb\u6765\u8bf4\uff0c \u6bcf\u6b21\u5199\u90fd\u4fdd\u8bc1\u7740\u539f\u5b50\u6027\uff0c\u6240\u6709\u6570\u636e\u90fd\u4f1a\u843d\u5730\u5230\u78c1\u76d8\uff0c\u4fdd\u8bc1\u7740\u6570\u636e\u7684\u53ef\u9760\u6027\u548c\u6301\u4e45\u6027\u3002<\/p>\n<h2>\u8bfb\u903b\u8f91<\/h2>\n<p>\u540c\u6837\uff0c\u6211\u4eec\u770b\u4e00\u6761\u6570\u636e\u662f\u5982\u4f55\u88ab\u8bfb\u53d6\u7684\u3002<\/p>\n<p>\u9996\u5148RocksDB\u4e2d\u7684\u6bcf\u4e00\u6761\u8bb0\u5f55(KeyValue)\u90fd\u6709\u4e00\u4e2aLogSequenceNumber\uff0c\u4ece\u6700\u521d\u76840\u5f00\u59cb\uff0c\u6bcf\u6b21\u5199\u5165\u52a01\u3002lsn\u5728memtable\u4e2d\u5355\u8c03\u9012\u589e\u3002\u4e4b\u524d\u63d0\u5230\u7684snapshot\u5373\u5c31\u662f\u57fa\u4e8elsn\u5b9e\u73b0\uff0c\u6bcf\u6b21\u4ee5\u53ea\u8bfb\u6a21\u5f0f\u6253\u5f00\u65f6\uff0c\u8bb0\u5f55\u4e00\u4e2alsn, \u5927\u4e8e\u8be5lsn\u7684key\u4e0d\u53ef\u89c1\u3002<\/p>\n<p>\u9996\u5148\u8bfb\u64cd\u4f5c\u5148\u8bbf\u95eememtable\u3002\u8df3\u8868\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u53ef\u8fbe\u5230logn, \u5982\u679c\u4e0d\u5b58\u5728\u4f1a\u8bbf\u95eelevel0, \u800clevel0\u6574\u4f53\u4e0d\u662f\u6709\u5e8f\u7684\uff0c \u6240\u4ee5\u4f1a\u6309\u521b\u5efa\u65f6\u95f4\u7531\u65b0\u5230\u8001\u4f9d\u6b21\u8bbf\u95ee\u6bcf\u4e00\u4e2asst\u6587\u4ef6\u3002\u6240\u4ee5\u65f6\u95f4\u590d\u6742\u5ea6\u4e3am*logn\u3002\u5982\u679c\u4ecd\u4e0d\u5b58\u5728\uff0c\u5219\u7ee7\u7eed\u8bbf\u95eelevel1\uff0c\u7531\u4e8elevel1\u53ca\u5176\u4ee5\u4e0a\u7684level\u90fd\u6574\u4f53\u6709\u5e8f\uff0c\u6240\u4ee5\u53ea\u9700\u8981\u8bbf\u95ee\u4e00\u4e2asst\u6587\u4ef6\u5373\u53ef\u3002 \u76f4\u5230\u67e5\u627e\u5230\u6700\u9ad8\u5c42\u6216\u8005\u627e\u5230\u8fd9\u4e2akey\u3002\u6240\u4ee5\u8bfb\u64cd\u4f5c\u53ef\u80fd\u4f1a\u88ab\u653e\u5927\u597d\u591a\u500d\u3002<\/p>\n<p>rocksdb\u505a\u4e86\u51e0\u70b9\u4f18\u5316\uff0c\u4e00\u70b9\u662f\u4e3a\u6bcf\u4e2aSST\u63d0\u4f9b\u4e00\u4e2a\u53ef\u914d\u7f6e\u7684bloomfilter. \u6bcf\u4e2alevel\u7684\u914d\u7f6e\u4e0d\u4e00\u6837\u3002\u8fd9\u6837\u53ef\u4ee5\u5feb\u901f\u7684\u786e\u8ba4\u4e00\u4e2akey\u5728\u4e0d\u5728\u67d0\u4e2aSST\u4e2d\uff0c\u8fd9\u70b9\u4ee5\u727a\u7272\u78c1\u76d8\u7a7a\u95f4\u6765\u6362\u53d6\u65f6\u95f4\u3002\u53e6\u4e00\u70b9\u662f\u63d0\u4f9b\u53ef\u914d\u7f6e\u7684cache, \u7528\u4e8e\u4fdd\u5b58\u8bbf\u95ee\u8fc7\u7684key\u5728\u5185\u5b58\u4e2d, \u8fd9\u91cc\u6709\u4e00\u70b9\u5c31\u662f\u5b83\u7f13\u5b58\u7684\u662f\u67d0\u4e2akey\u5728SST\u6587\u4ef6\u4e2d\u7684\u6574\u4e2ablock\u91cc\u7684\u8bb0\u5f55\u3002<\/p>\n<h2>\u5b58\u50a8\u7ed3\u6784\u4e4bmemtable<\/h2>\n<p>rocksdb\u7684memtable, \u9ed8\u8ba4\u662fskiplist\u8df3\u8868\u7ed3\u6784\uff0c \u4f46\u5b83\u4e5f\u540c\u65f6\u652f\u6301hash-skiplist\uff0c hash-linklist\u7ed3\u6784\u3002\u5728\u521b\u5efa\u6570\u636e\u5e93\u65f6\uff0c\u53ef\u914d\u7f6e\u9009\u62e9\u5b58\u50a8\u5408\u9002\u7ed3\u6784\u3002\u4ec0\u4e48\u65f6\u5019\u9009\u62e9\u5408\u9002\u7684\u7ed3\u6784\u7c7b\u578b\uff0c\u8fd9\u5757\u8fd8\u503c\u5f97\u7814\u7a76\u3002\u5982\u679c\u5c06\u6240\u6709\u7684\u6570\u636e\u90fd\u4fdd\u5b58\u5230\u5185\u5b58\u4e2d\uff0c\u8fd9\u65f6\u5019\u7528hash-linklist\u662f\u4e0d\u662f\u66f4\u5408\u9002\u5462\u3002<\/p>\n<h4>skiplist \u7ed3\u6784\uff1a<\/h4>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"612\" data-height=\"87\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/12866002-8020e9051b4c31c8.jpg?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/612\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/12866002-8020e9051b4c31c8.jpg\" data-original-width=\"612\" data-original-height=\"87\" data-original-format=\"image\/jpeg\" data-original-filesize=\"21479\" \/><\/div>\n<\/div>\n<\/div>\n<h4>hash-skiplist\u7ed3\u6784\uff1a<\/h4>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"1532\" data-height=\"420\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/12866002-ecd906d28fa6deeb.jpg?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/1000\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/12866002-ecd906d28fa6deeb.jpg\" data-original-width=\"1532\" data-original-height=\"420\" data-original-format=\"image\/jpeg\" data-original-filesize=\"49001\" \/><\/div>\n<\/div>\n<\/div>\n<h4>hash-linklist\u7ed3\u6784\uff1a<\/h4>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"1510\" data-height=\"488\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/12866002-522f30e8e4c2851e.jpg?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/1000\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/12866002-522f30e8e4c2851e.jpg\" data-original-width=\"1510\" data-original-height=\"488\" data-original-format=\"image\/jpeg\" data-original-filesize=\"48835\" \/><\/div>\n<\/div>\n<\/div>\n<h2>\u5b58\u50a8\u7ed3\u6784\u4e4bSST<\/h2>\n<p>SST(Sorted Sequence Table)<\/p>\n<p>SST\u4f5c\u4e3arocksdb\u7b2c\u4e8c\u4e2a\u5b58\u50a8\u65b9\u5f0f\uff0c \u5b83\u7684\u6570\u636e\u4e3b\u8981\u4ee5block\u5757\u7684\u65b9\u5f0f\u5b58\u50a8\uff0c\u9ed8\u8ba4\u662f4k\u5927\u5c0f\u3002ps\u4e4b\u6240\u4ee5\u9ed8\u8ba4\u8bbe\u5b9a4k\u662f\u56e0\u4e3a\u6211\u4eec\u4e00\u822c\u7684\u64cd\u4f5c\u7cfb\u7edf\u5b58\u50a8\u7684\u6bcf\u4e2a\u9875\u521a\u597d\u662f4k\uff0c \u8fd9\u6837\u6bcf\u6b21\u52a0\u8f7d\u4e00\u4efd\u6570\u636e\u4e00\u4e2ablock\u521a\u597d\u5c31\u662f\u4e00\u9875\u3002\u8fd9\u6837\u5c31\u4e0d\u4f1a\u9020\u6210\uff0cblock\u8fc7\u5927\u9700\u8981\u5206\u9875\u5b58\u50a8\u6216\u8005block\u8fc7\u5c0f\u4e00\u9875\u5b58\u50a8\u4e00\u4e2ablock\u9020\u6210\u5185\u5b58\u6d6a\u8d39\u3002<\/p>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"387\" data-height=\"58\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/12866002-94e15c0a02d24522.jpg?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/387\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/12866002-94e15c0a02d24522.jpg\" data-original-width=\"387\" data-original-height=\"58\" data-original-format=\"image\/jpeg\" data-original-filesize=\"14223\" \/><\/div>\n<\/div>\n<\/div>\n<p>\u5176\u4e2d\u6bcf\u4e2ablock\u4ee5\u6700\u540e\u7684crc\u7801\u6765\u6548\u9a8c\u6570\u636e\u7684\u6b63\u786e\u6027\u3002<\/p>\n<p>\u6839\u636eblock\u5b58\u50a8\u7684\u4e0d\u540c\u6570\u636e\u53ef\u4ee5\u5206\u4e3a\u591a\u79cd\u7c7b\u578b\u3002\u5176\u4e2dDatablock\u91cc\u5b58\u50a8\u7740\u538b\u7f29\u7684key, value \u8bb0\u5f55\uff0c\u662f\u6570\u636e\u5c42\u3002Metablock\u5b58\u50a8\u7740filter\u7684\u6570\u636e\uff0c\u5176\u4e2dbloomfilter\uff0c prefix_bloomfilter, \u8fd8\u6709\u7528\u6237\u81ea\u5b9a\u4e49\u7684\u4e00\u4e9bfilter\u7684\u6570\u636e\u5b58\u5728\u8fd9\u91cc\u3002 Metablock Index\u8bb0\u5f55\u7740filter\u7684\u5927\u5c0f\u504f\u79fb\u91cf\u7b49\u4fe1\u606f\u3002Indexblock\u8bb0\u5f55\u7740\u6bcf\u4e00\u4e2aDatablock\u7684\u6700\u5927key\u548c\u6700\u5c0fkey\u7684\u504f\u79fb\u91cf\u7b49\u4fe1\u606f\u3002 Footer\u8bb0\u5f55\u7740Metablockindex\u5757\u7684\u504f\u79fb\u91cf\u548c\u5927\u5c0f\u4ee5\u53caIndexblock\u7684\u504f\u79fb\u91cf\u548c\u5927\u5c0f\u7b49\u4fe1\u606f\u3002<\/p>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"240\" data-height=\"268\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/12866002-583d8b6b3fabcf10.jpg?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/240\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/12866002-583d8b6b3fabcf10.jpg\" data-original-width=\"240\" data-original-height=\"268\" data-original-format=\"image\/jpeg\" data-original-filesize=\"37083\" \/><\/div>\n<\/div>\n<\/div>\n<h2>Flush\u64cd\u4f5c<\/h2>\n<p>* \u9996\u5148\u5f53\u53ea\u8bfbmemtable\u7684\u6570\u91cf\u5927\u4e8e\u9608\u503c\uff0c\u5982\u679c\u6ca1\u6709\u5176\u5b83\u7ebf\u7a0bflush\uff0c\u5219\u5c06\u8be5\u6b21\u64cd\u4f5c\u52a0\u5165\u961f\u5217\u3002<\/p>\n<p>* \u904d\u5386skiplist\uff0c\u901a\u8fc7\u8fed\u4ee3\u5668\u9010\u4e00\u626b\u63cfkey-value\uff0c\u5c06key-value\u5199\u5165\u5230data-block\uff0c<\/p>\n<p>* \u5982\u679cdata block\u5927\u5c0f\u5df2\u7ecf\u8d85\u8fc7\u9608\u503c\uff0c\u6216\u8005key-value\u5bf9\u662f\u6700\u540e\u7684\u4e00\u5bf9\uff0c\u5219\u89e6\u53d1\u4e00\u6b21block-flush\uff0c \u540c\u65f6\u6839\u636e\u538b\u7f29\u7b97\u6cd5\u5bf9block\u8fdb\u884c\u538b\u7f29\uff0c\u5e76\u751f\u6210\u5bf9\u5e94\u7684index block\u8bb0\u5f55\uff1b<\/p>\n<p>* \u6240\u6709\u6570\u636e\u66f4\u65b0\u5b8c\u540e\uff0c \u5199\u5165index block\uff0cmeta block\uff0cmetaindex block\u4ee5\u53cafooter\u4fe1\u606f\u5230\u6587\u4ef6\u5c3e\uff1b<\/p>\n<p>* \u5e76\u5c06\u53d8\u5316sst\u6587\u4ef6\u7684\u5143\u4fe1\u606f\u5199\u5165manifest\u6587\u4ef6\u3002 \u540c\u65f6\u6e05\u7406wal\u65e5\u5fd7\u6587\u4ef6\u3002<\/p>\n<h2>Compaction\u64cd\u4f5c<\/h2>\n<p>* rocksdb\u4f1a\u5b9a\u671f\u7684\u68c0\u6d4b\u6bcf\u4e2alevel\u7684\u72b6\u6001\uff0c \u5e76\u4e3a\u6bcf\u4e2alevel\u8ba1\u7b97score. score\u901a\u8fc7level\u5b9e\u9645\u7684size\uff0fbase_size\u6765\u8ba1\u7b97\uff1blevel0\u7684score\u662f\u901a\u8fc7\u5b9e\u9645sst\u6570\uff0f level0 \u7684sst\u6587\u4ef6\u6570\u9608\u503c\u8ba1\u7b97\u3002<\/p>\n<p>* \u5982\u679cscore&gt;1 \u5219\u4f1a\u89e6\u53d1compaction, \u627escore\u6700\u5927\u7684level\uff0c\u6839\u636e\u4e00\u5b9a\u7b56\u7565\u4ece\u4e2d\u9009\u62e9\u4e00\u4e2asst\u6587\u4ef6\u8fdb\u884ccompaction.<\/p>\n<p>* \u6839\u636e\u8fd9\u4e2asst\u6587\u4ef6\u7684minkey, maxkey\u627e\u5230leveln+1\u5c42\u4e2d\u6709\u91cd\u53e0\u7684sst\u6587\u4ef6\u3002 \u591a\u4e2asst\u6587\u4ef6\u8fdb\u884c\u5f52\u5e76\u6392\u5e8f\uff0c\u751f\u6210\u65b0\u7684\u6709\u5e8fsst\u6587\u4ef6\u3002<\/p>\n<p>* \u5c06\u53d8\u5316\u7684sst\u6587\u4ef6\u7684\u4fe1\u606f\u5199\u5165manifest\u6587\u4ef6\u3002<\/p>\n<h2>\u6570\u636e\u5e93\u6587\u4ef6\u7ed3\u6784<\/h2>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"545\" data-height=\"290\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/12866002-853d53d3fe562cff.jpg?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/545\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/12866002-853d53d3fe562cff.jpg\" data-original-width=\"545\" data-original-height=\"290\" data-original-format=\"image\/jpeg\" data-original-filesize=\"83672\" \/><\/div>\n<\/div>\n<\/div>\n<h4>SST<\/h4>\n<p>rocksdb\u7684\u6570\u636e\u6587\u4ef6\uff0c \u4e25\u683c\u8bf4\u5305\u542bSST\u6587\u4ef6\uff0c\u8fd8\u6709\u5185\u5b58\u4e2d\u7684memtable\u6570\u636e\u3002<\/p>\n<p>memtable\u5199\u5165\u5230\u4e00\u5b9a\u9608\u503c\uff0c\u53ef\u80fd\u662f\u8fd9\u4e2a\u53c2\u6570max_total_wal_size\uff08\u5f85\u9a8c\u8bc1\uff09,\u4f1aflush memtable\u91cc\u7684\u6570\u636e\u5230SST level0\u6587\u4ef6\u3002level0\u6587\u4ef6\u7684key\u4e0d\u4e00\u5b9a\u662f\u6709\u5e8f\u7684\uff0c\u4f46leveln(n&gt;0)\u7684key\u5fc5\u7136\u662f\u6709\u5e8f\u7684.<\/p>\n<p>\u53ef\u901a\u8fc7ldb\u5de5\u5177\u6765\u67e5\u770bSST\u7684\u5185\u5bb9<\/p>\n<p>&#8220;`<\/p>\n<p># ..\/ldb &#8211;db=.\/data\/fansnum_tail scan<\/p>\n<p>1162218773 : 34<\/p>\n<p>1162222073 : 4433<\/p>\n<p>1162231091 : 1025<\/p>\n<p>1162231094 : 4<\/p>\n<p>1162231403 : 72<\/p>\n<p>1162233913 : 66<\/p>\n<p>1162241104 : 35<\/p>\n<p>.\/db_bench &#8211;db=\/data1\/xiaodong28\/PacketServer\/PacketComputation\/offline_update\/fansnum\/ &#8211;benchmarks=fillrandom &#8211;num=10000 &#8211;compression_type=none<\/p>\n<p>&#8220;`<\/p>\n<h4>MANIFEST<\/h4>\n<p>*MANIFEST*: \u8bb0\u5f55rocksdb\u6700\u8fd1\u7684\u72b6\u6001\u53d8\u5316\u65e5\u5fd7\u3002\u5176\u4e2d\u5305\u542bmanifest\u65e5\u5fd7 \u548c\u6700\u65b0\u7684\u6587\u4ef6\u6307\u9488 *CURRENT*, \u8bb0\u5f55\u6700\u8fd1\u7684MANIFEST<\/p>\n<p>manifest\u65e5\u5fd7: *MANIFEST-(seq number)*, \u8bb0\u5f55\u4e00\u7cfb\u5217\u7248\u672c\u66f4\u65b0\u8bb0\u5f55\u3002<\/p>\n<p>\u5728RocksDB\u4e2d\u4efb\u610f\u65f6\u95f4\u5b58\u50a8\u5f15\u64ce\u7684\u72b6\u6001\u90fd\u4f1a\u4fdd\u5b58\u4e3a\u4e00\u4e2aVersion(\u4e5f\u5c31\u662fSST\u7684\u96c6\u5408)\uff0c\u800c\u6bcf\u6b21\u5bf9Version\u7684\u4fee\u6539\u90fd\u662f\u4e00\u4e2aVersionEdit,\u800c\u6700\u7ec8\u8fd9\u4e9bVersionEdit\u5c31\u662f \u7ec4\u6210manifest-log\u6587\u4ef6\u7684\u5185\u5bb9<\/p>\n<p>&#8220;`<\/p>\n<p>\/data1\/rocksdb\/rocksdb\/bin\/ldb &#8211;path=.\/fansnum\/MANIFEST-000014\u00a0 manifest_dump<\/p>\n<p>&#8220;`<\/p>\n<h4>log<\/h4>\n<p>WAL\u6587\u4ef6\u3002 rocksdb\u5728\u5199\u6570\u636e\u65f6\uff0c \u5148\u4f1a\u5199WAL\uff0c\u518d\u5199memtable\u3002\u4e3a\u4e86\u907f\u514dcrash\u65f6\uff0c memtable\u7684\u6570\u636e\u4e22\u5931\u3002\u670d\u52a1\u91cd\u542f\u65f6\u4f1a\u4ece\u8be5\u6587\u4ef6\u6062\u590dmemtable\u3002<\/p>\n<h4>OPTIONS<\/h4>\n<p>rocksdb\u7684\u914d\u7f6e\u6587\u4ef6\uff0c \u914d\u7f6e\u53c2\u6570\u8bf4\u660e\u53ef\u53c2\u8003\u4e0b\u4e00\u5c0f\u8282\u3002<\/p>\n<h4>IDENTITY<\/h4>\n<p>\u5b58\u653e\u5f53\u524drocksdb\u7684\u552f\u4e00\u6807\u8bc6<\/p>\n<h4>LOCK<\/h4>\n<p>LOCK \u8fdb\u7a0b\u7684\u5168\u5c40\u9501\uff0cDB\u4e00\u65e6\u88abopen, \u5176\u4ed6\u8fdb\u7a0b\u5c06\u65e0\u6cd5\u4fee\u6539\uff0c\u62a5\u7c7b\u4f3c\u4ee5\u4e0b\u9519\u8bef\u3002<\/p>\n<p>&#8220;`<\/p>\n<p>Open rocksdb ..\/data\/fansnum_rocksdb\/ failed,\u00a0 reason: IO error: while open a file for lock: ..\/data\/fansnum_rocksdb\/\/LOCK: Permission deniedCommand init,\u00a0 costtime: 0.946000 ms<\/p>\n<p>&#8220;`<\/p>\n<h4>LOG<\/h4>\n<p>rocksdb\u7684\u64cd\u4f5c\u65e5\u5fd7\u6587\u4ef6\uff0c \u53ef\u914d\u7f6e\u5b9a\u671f\u7684\u7edf\u8ba1\u4fe1\u606f\u5199\u5165LOG. \u53ef\u901a\u8fc7info_log_level\u8c03\u6574\u65e5\u5fd7\u8f93\u51fa\u7ea7\u522b; \u901a\u8fc7keep_log_file_num\u9650\u5236\u6587\u4ef6\u6570\u91cf \u7b49\u7b49\u3002<\/p>\n<h2>\u5199\u6570\u636e\u6d4b\u8bd5<\/h2>\n<p>\u5bf9\u4e8erocksdb\u7684\u5199\u64cd\u4f5c\u505a\u4e86\u4e2a\u6d4b\u8bd5\u6570\u636e\u5206\u6790\uff1a<\/p>\n<p>* \u6d4b\u8bd5\u673a\u5668\u662f20CPU, 32G\u7684\u5185\u5b58\uff0c STAF\u78c1\u76d8<\/p>\n<p>* \u6d4b\u8bd5\u6570\u636e\u5e93\u7684\u603bkey\u91cf\u4e3a3.9\u4ebf\uff0c\u5927\u5c0f\u4e3a5.2G\u3002<\/p>\n<p>* \u6700\u7ec8\u751f\u6210\u7684\u6570\u636e\u6587\u4ef6\u5927\u5c0f\u4e3a2.63G, \u6570\u636e\u538b\u7f29\u6bd4\u4e3a50.6%,<\/p>\n<p>* \u751f\u6210\u7684level\u7ed3\u6784\u4e3aLevel0\u6ca1\u6709\u6570\u636e\uff0cLevel1 5\u4e2asst\u6587\u4ef6\uff0c\u603b\u5927\u5c0f290.22M; Level2 43\u4e2a\u6587\u4ef6\uff0c\u603b\u5927\u5c0f2.35G. \u6211\u4eec\u4ecelevel\u6587\u4ef6\u7ed3\u6784\u53ef\u4ee5\u770b\u51fa\u7ed3\u679c\u8fd8\u662f\u6bd4\u8f83\u597d\u7684\uff0c\u6bd4\u5982\u67e5\u4e00\u4e2akey,\u53ea\u9700\u8bfblevel1\u548clevel2\u4e2d\u5404\u4e00\u4e2asst\u6587\u4ef6\u5373\u53ef\u3002<\/p>\n<p>* 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class=\"image-view\" data-width=\"463\" data-height=\"393\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/12866002-b4d73f48833da0d7.jpg?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/463\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/12866002-b4d73f48833da0d7.jpg\" data-original-width=\"463\" data-original-height=\"393\" data-original-format=\"image\/jpeg\" data-original-filesize=\"36692\" \/><\/div>\n<\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"476\" data-height=\"347\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/12866002-2f6391312a9f84b1.jpg?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/476\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/12866002-2f6391312a9f84b1.jpg\" data-original-width=\"476\" 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