{"id":10008414,"date":"2024-02-29T23:53:30","date_gmt":"2024-02-29T15:53:30","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008414"},"modified":"2024-02-29T23:53:30","modified_gmt":"2024-02-29T15:53:30","slug":"%e8%9a%82%e8%9a%81%e6%b5%81%e5%9c%ba%e6%99%af%e7%8a%b6%e6%80%81%e6%bc%94%e8%bf%9b%e5%92%8c%e4%bc%98%e5%8c%96","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008414","title":{"rendered":"\u8682\u8681\u6d41\u573a\u666f\u72b6\u6001\u6f14\u8fdb\u548c\u4f18\u5316"},"content":{"rendered":"<blockquote>\n<p>\u672c\u6587\u6574\u7406\u81ea\u8682\u8681\u96c6\u56e2\u5b9e\u65f6\u8ba1\u7b97\u7ec4\u6280\u672f\u4e13\u5bb6\u95f5\u6587\u4fca\u5728 FFA 2023 \u6838\u5fc3\u6280\u672f\uff08\u4e00\uff09\u4e2d \u7684\u5206\u4eab\uff0c\u5185\u5bb9\u5173\u4e8e\u8682\u8681\u6d41\u573a\u666f\u72b6\u6001\u6f14\u8fdb\u548c\u4f18\u5316\u7684\u7814\u7a76\uff0c\u4e3b\u8981\u5206\u4e3a\u4ee5\u4e0b\u4e09\u90e8\u5206\uff1a<\/p>\n<ol>\n<li>\u72b6\u6001\u540e\u7aef\u7684\u6f14\u8fdb<\/li>\n<li>\u4f18\u5316\u4e0e\u9002\u914d<\/li>\n<li>\u672a\u6765\u5c55\u671b<\/li>\n<\/ol>\n<\/blockquote>\n<h2><strong>\u4e00. \u72b6\u6001\u540e\u7aef\u7684\u6f14\u8fdb<\/strong><\/h2>\n<h3><strong>1. \u8682\u8681\u72b6\u6001\u540e\u7aef\u7684\u6f14\u8fdb<\/strong><\/h3>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668868\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\"><\/p>\n<p>\u5728\u8682\u8681\u7684\u751f\u4ea7\u73af\u5883\u4e2d\uff0c\u6700\u65e9\u6709\u4e00\u5957\u6d41\u8ba1\u7b97\u7cfb\u7edf\u5185\u90e8\u7684\u9879\u76ee\uff0c\u4ee3\u53f7\u4e3a Kepler\u3002\u5728 Kepler \u7cfb\u7edf\u5b9e\u73b0\u4e86\u4e00\u5957\u53ef\u63d2\u62d4\u7684\u72b6\u6001\u540e\u7aef\u5b58\u50a8\u7cfb\u7edf\u3002\u5728\u6211\u4eec\u751f\u4ea7\u73af\u5883\u4e2d\u4f7f\u7528\u6700\u5e7f\u6cdb\u7684\u662f\u57fa\u4e8e Hbase \u548c OceanBase \u8fd9\u79cd\u8fdc\u7a0b\u5b58\u50a8\u7684\u72b6\u6001\u540e\u7aef\uff0c\u5b83\u7684\u4f18\u52bf\u5728\u4e8e checkpoint \u975e\u5e38\u7684\u5feb\uff0c\u56e0\u4e3a\u6d41\u4efb\u52a1\u5728\u8ba1\u7b97\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5b83\u7684\u6570\u636e\u5df2\u7ecf\u5199\u5230\u8fdc\u7a0b\u5b58\u50a8\u4e2d\uff0c\u5e76\u4e14\u5b83\u7684 failover \u4e5f\u4f1a\u6bd4\u8f83\u5feb\uff0c\u56e0\u4e3a\u5728 failover \u7684\u8fc7\u7a0b\u4e2d\uff0c\u5b83\u4e0d\u6d89\u53ca\u5230\u6570\u636e\u7684\u4e0b\u8f7d\u4ee5\u53ca\u6062\u590d\u7684\u8fc7\u7a0b\u3002\u5b83\u4e5f\u4e0d\u4f9d\u8d56\u4e8e\u672c\u5730\u78c1\u76d8\uff0c\u5bf9\u4e8e\u4e91\u5316\u73af\u5883\u4f1a\u6bd4\u8f83\u53cb\u597d\u3002<\/p>\n<p>\u5e76\u4e14\u5728\u5206\u5e03\u5f0f\u5b58\u50a8\u7cfb\u7edf\u4e2d\uff0c\u4e00\u822c\u90fd\u63d0\u4f9b\u4e86\u8bbf\u95ee\u8fd9\u4e9b\u6570\u636e\u7684 API\uff0c\u6240\u4ee5\u5bf9\u4e8e\u8fd9\u4e9b\u5df2\u7ecf\u5b58\u50a8\u5728\u72b6\u6001\u540e\u7aef\u91cc\u9762\u7684\u6570\u636e\u662f\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e9b API \u76f4\u63a5\u8bbf\u95ee\u3001\u67e5\u8be2\u51fa\u6765\uff0c\u6bd4\u5982\u6211\u4eec\u7ebf\u4e0a\u4f1a\u901a\u8fc7 Hbase \u7684 API \u76f4\u63a5\u5c06\u6211\u4eec\u5b58\u50a8\u5728\u8fd9\u4e9b\u7cfb\u7edf\u4e2d\u7684\u6d41\u4efb\u52a1\u7684\u72b6\u6001\u7684 offset \u76f4\u63a5\u66b4\u9732\u51fa\u6765\uff0c\u8fd9\u5c31\u7c7b\u4f3c\u4e8e Flink \u91cc\u9762\u7684 qureyable state \u8fd9\u79cd\u80fd\u529b\u3002<\/p>\n<p>\u5b83\u7684\u52a3\u52bf\u4e5f\u6bd4\u8f83\u660e\u663e\u3002\u9996\u5148\uff0c\u5b83\u7684\u6027\u80fd\u4f1a\u6bd4\u8f83\u5dee\u3002\u56e0\u4e3a\u5bf9\u4e8e\u8fd9\u79cd\u5206\u5e03\u5f0f\u5b58\u50a8\u7cfb\u7edf\uff0c\u5b83\u6240\u80fd\u63d0\u4f9b\u7684\u8bbf\u95ee\u5ef6\u8fdf\uff0c\u57fa\u672c\u90fd\u662f\u5728\u6beb\u79d2\u7ea7\uff0c\u800c\u672c\u5730\u5b58\u50a8\u4e00\u822c\u80fd\u591f\u5230\u8fbe\u5fae\u79d2\u7ea7\uff0c\u6240\u4ee5\u8fd9\u4e2a\u65f6\u5ef6\u5c31\u6bd4\u8f83\u9ad8\uff0c\u5b83\u7684\u6574\u4f53\u7684\u8bbf\u95ee TPS \u5c31\u6bd4\u8f83\u53d7\u9650\uff0c\u4e00\u822c\u4e0d\u592a\u9002\u5408\u4e8e\u5927\u72b6\u6001\u7684\u4efb\u52a1\u3002\u7b2c\u4e8c\uff0c\u5b83\u7684\u7a33\u5b9a\u6027\u4f1a\u4e0d\u8db3\uff0c\u56e0\u4e3a\u5b83\u4f1a\u53d7\u9650\u4e8e\u7b2c\u4e09\u65b9\u670d\u52a1\u7684\u7a33\u5b9a\u6027\u5f71\u54cd\uff0c\u5b83\u6574\u4f53\u7684 SLA \u5c31\u4e0d\u5982\u672c\u5730\u5b58\u50a8\u3002<\/p>\n<h3><strong>2. \u57fa\u4e8e RocksDB \u672c\u5730\u72b6\u6001\u540e\u7aef<\/strong><\/h3>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668869\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u5728\u6211\u4eec\u9646\u7eed\u4ece\u8682\u8681\u5185\u90e8\u8d44\u6e90\u7684\u6d41\u8ba1\u7b97\uff0c\u9010\u6b65\u5207\u5230\u793e\u533a\u7684 Flink \u7684\u8fc7\u7a0b\u4e2d\uff0c\u72b6\u6001\u540e\u7aef\u4e5f\u5c31\u81ea\u7136\u5207\u6362\u5230 Flink \u81ea\u5e26\u7684\u57fa\u4e8e RocksDB \u7684\u672c\u5730\u72b6\u6001\u5b58\u50a8\u4e2d\u3002<\/p>\n<p>RocksDB \u72b6\u6001\u5b58\u50a8\u4e5f\u662f\u73b0\u5728\u4f7f\u7528\u7684\u975e\u5e38\u591a\u7684\u72b6\u6001\u5b58\u50a8\uff0c\u5b83\u7684\u4f18\u52bf\u4e3b\u8981\u662f\uff0c\u5b83\u662f\u57fa\u4e8e RocksDB \u8fd9\u79cd\u9ad8\u6027\u80fd\u7684\u672c\u5730 KVstore\uff0c\u6240\u4ee5\u5b83\u7684\u72b6\u6001\u8bbf\u95ee\u7684\u5ef6\u65f6\u975e\u5e38\u4f4e\uff0c\u5b83\u80fd\u6ee1\u8db3\u65f6\u95f4\u654f\u611f\u6bd4\u8f83\u9ad8\u7684\u4efb\u52a1\u541e\u5410\u7684\u9700\u6c42\u3002\u7a33\u5b9a\u6027\u66f4\u597d\u3002<\/p>\n<p>\u5b83\u7684\u52a3\u52bf\u5728\u4e8e\uff0c\u7b2c\u4e00\u56e0\u4e3a RocksDB \u672c\u8eab\u662f\u57fa\u4e8e LSMtree \u8fd9\u6837\u7684\u7ed3\u6784\u7684\uff0c\u727a\u7272\u4e86\u4e00\u5b9a\u7684\u8bfb\u7684\u6027\u80fd\uff0c\u6765\u6ee1\u8db3\u5b83\u7684\u5199\u7684\u6027\u80fd\u3002\u4f46\u662f\u5f53\u6211\u4eec\u5199\u5165\u7684\u524d\u53f0\u6d41\u91cf\u6bd4\u8f83\u5927\u7684\u65f6\u5019\uff0c\u5b83\u7684\u540e\u53f0\u7684 compaction \u4f1a\u53bb\u9010\u6b65\u5360\u7528\u66f4\u591a\u7684\u673a\u5668\u7684 IO \u548c CPU \u8d44\u6e90\uff0c\u800c\u5f71\u54cd\u5230\u524d\u53f0\u7684\u5199\u5165\u4ee5\u53ca\u8bbf\u95ee\u7684\u9700\u6c42\uff0c\u8868\u73b0\u7684\u6bd4\u8f83\u660e\u663e. \u5728\u7ebf\u4e0a\u7684\u4efb\u52a1\u4e2d\u4f1a\u770b\u89c2\u5bdf\u5230\u7684\u73b0\u8c61\uff0c\u4efb\u52a1\u5728\u9ad8\u5cf0\u671f\u7684\u65f6\u5019\uff0c\u4f1a\u770b\u5230\u5b83\u7684\u541e\u5410\u53cd\u800c\u4f1a\u6709\u4e0b\u964d\u7684\u8868\u73b0\u3002<\/p>\n<p>\u7b2c\u4e8c\uff0c\u8fd9\u79cd\u57fa\u4e8e RocksDB \u7684\u672c\u5730\u72b6\u6001\u540e\u7aef\uff0c\u5b83\u7684 Rescale \u548c Failover \u4e5f\u4f1a\u6bd4\u8f83\u6162\u3002<\/p>\n<p>\u7b2c\u4e09\uff0c\u5b83\u7684 Checkpoint \u7684\u4ee3\u4ef7\u4f1a\u6bd4\u8f83\u9ad8\uff0c\u56e0\u4e3a\u5b83\u6d89\u53ca\u5230\u672c\u5730\u7684\u72b6\u6001\u6587\u4ef6\u7684\u4e0a\u4f20. \u4e3a\u4e86\u66f4\u597d\u7684\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\uff0c\u8682\u8681\u5185\u90e8\u81ea\u7814\u4e86\u4e00\u5957\u57fa\u4e8e RocksDB \u7684\u672c\u5730\u7684 KV \u5b58\u50a8\u53bb\u5c1d\u8bd5\u4f18\u5316\u4ee5\u4e0a\u7684\u51e0\u4e2a\u95ee\u9898\u3002<\/p>\n<h3><strong>3. RocksDB compaction \u8fc7\u7a0b<\/strong><\/h3>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668870\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u5728\u4ecb\u7ecd\u672c\u5730 KV \u5b58\u50a8\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u770b\u4e00\u4e0b RocksDB \u7684 compaction \u7684\u8fc7\u7a0b\u3002\u5b83\u5728 compaction \u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u5c06\u67d0\u4e00\u5c42\u7ea7\u6821\u9a8c\u51fa\u5b83\u6240\u9700\u8981\u8fdb\u884c compaction \u7684\u6587\u4ef6\uff0c\u7136\u540e\u53bb\u8fdb\u884c compact\u3002\u5728 compact \u7684\u8fc7\u7a0b\u4e2d\uff0c\u5b83\u4f1a\u6311\u9009\u51fa\u4e0b\u4e00\u5c42\u7ea7\u4e2d\u4e0e\u8fd9\u4e00\u5c42\u7684\u6587\u4ef6\uff0c\u5c06 key \u5b58\u5728 overlap \u7684\u6587\u4ef6\u8fdb\u884cMerge\u3002\u5728Merge\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5b83\u7684\u76ee\u7684\u662f\u53bb\u964d\u4f4e\u7a7a\u95f4\u653e\u5927\uff0c\u4ee5\u53ca\u901a\u8fc7\u6587\u4ef6\u7684\u5408\u5e76\u6765\u51cf\u5c11\u540e\u7eed\u67e5\u8be2\u4e2d\u7684\u6587\u4ef6\u7684\u5f00\u9500\u3002\u4f46\u662f\u5728\u5408\u5e76\u7684\u8fc7\u7a0b\u4e2d\uff0c\u56e0\u4e3a\u6211\u4eec\u672c\u8eab KV \u7684\u683c\u5f0f\uff0c\u5e76\u4e14\u4e00\u822c\u6765\u8bf4 value \u7684\u662f\u6bd4\u8f83\u5927\u7684\u3002\u4f46\u662f\u5728\u5408\u5e76\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5176\u5b9e\u8fd9\u4e2a value \u662f\u4e0d\u9700\u8981\u968f\u7740 KV \u5408\u5e76\u7684\u8fc7\u7a0b\u800c\u5408\u5e76\u7684\u3002\u6240\u4ee5\uff0c\u57fa\u4e8e\u8fd9\u6837\u7684\u4e00\u4e2a\u601d\u60f3\uff0c\u63d0\u51fa\u4e86 KV \u5206\u79bb\u7684 RocksDB \u7684\u589e\u5f3a\u7684\u5b9e\u73b0\u3002<\/p>\n<h3><strong>4. AntKV: \u57fa\u4e8e RocksDB KV \u5206\u79bb\u7684\u672c\u5730\u5b58\u50a8\u5f15\u64ce<\/strong><\/h3>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668871\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u793e\u533a\u6216\u8005\u5de5\u4e1a\u754c\u6709\u975e\u5e38\u591a\u7684 KV \u5206\u79bb\u7684\u601d\u8def\uff0c\u6bd4\u8f83\u5178\u578b\u7684\u662f\u8bba\u6587 whiskey \u91cc\u9762\u7684\u4e00\u4e2a KV \u5206\u79bb\u7684\u5b9e\u8df5\u3002\u6211\u4eec\u7684 KV \u6574\u4f53\u7684\u601d\u8def\u4e5f\u662f\u63a5\u8fd1\u4e8e\u8fd9\u79cd KV \u5206\u79bb\u7684\u601d\u60f3\uff0c\u8fd9\u4e2a\u56fe\u91cc\u9762\u663e\u793a\u7684\u662f\u4e00\u4e2a KV value \u7684\u5199\u5165\u7684\u8fc7\u7a0b\u3002<\/p>\n<p>\u9996\u5148\uff0c\u5b83\u7684 value \u90e8\u5206\u4f1a\u88ab\u5199\u5165\u5230 value log \u91cc\uff0c\u540c\u65f6\u4f1a\u5c06 value log \u6240\u5bf9\u5e94\u7684\u6587\u4ef6 offset \u66ff\u6362\u6210\u539f\u59cb\u7684 KV \u6570\u636e\u91cc\u9762 value \u90e8\u5206\uff0c\u7136\u540e\u518d\u5199\u5230 LSM tree \u91cc\u3002\u5728\u540e\u7eed\u7684 compaction \u7684\u8fc7\u7a0b\u4e2d\uff0c\u53ea\u6709 SST file  \u91cc\u9762\u7684\u6570\u636e\u624d\u4f1a\u53c2\u4e0e compaction\uff0cvalue log \u8fd9\u4e2a\u6570\u636e\u4e0d\u4f1a\u53c2\u4e0e compaction\u3002<\/p>\n<p>\u6ce8\u610f\u8fd9\u91cc\u9762, \u5e76\u4e0d\u662f\u6240\u6709\u7684 KV \u90fd\u53c2\u4e0e KV \u5206\u79bb\u7684\u5b9e\u73b0\u3002\u56e0\u4e3a\u4ece\u89c2\u5bdf\u5230\u7684\u73b0\u8c61\u6765\u770b\uff0c\u6d41\u8ba1\u7b97\u91cc\u4e5f\u5e76\u4e0d\u662f\u6240\u6709\u7684\u6570\u636e\u90fd\u6ee1\u8db3 KV \u5206\u79bb\u7684 pattern\u3002\u56e0\u4e3a\u4ece KV \u5206\u79bb\u7684 pattern \u7684\u4e3b\u8981\u53d7\u76ca\u573a\u666f\u6765\u8bf4\uff0c value \u6bd4\u8f83\u5927\u7684\u65f6\u5019\uff0c\u901a\u8fc7\u51cf\u5c11 value \u7684 compaction \u7684 IO \u64cd\u4f5c\u6765\u63d0\u5347\u6574\u4f53\u541e\u5410\u3002\u5982\u679c value \u5e76\u4e0d\u5927\uff0c\u5c31\u4f1a\u5bfc\u81f4\u540e\u7eed\u67e5\u8be2\u7684\u65f6\u5019\uff0c\u9700\u8981\u5148\u901a\u8fc7 LSM \u67e5\u5230\u5bf9\u5e94\u7684 key \u6240\u5bf9\u5e94\u7684 value \u7684 address \uff0c\u7136\u540e\u518d\u8df3\u8f6c\u5230 value log \u91cc\u53bb\u67e5\u8be2\u8fd9\u4e2a value \u6240\u5bf9\u5e94\u7684\u771f\u5b9e\u7684\u6570\u636e\uff0c\u8fd9\u6837\u5c31\u589e\u52a0\u4e86\u67e5\u8be2\u7684\u5f00\u9500\u3002\u6240\u4ee5\uff0c\u4e3a\u4e86\u89e3\u51b3\u8fd9\u6837\u7684\u95ee\u9898\uff0c\u5728 KV \u5206\u79bb\u7684\u65f6\u5019\uff0c\u80fd\u591f\u8ba9\u5b83\u81ea\u9002\u5e94\u7684\u9009\u62e9 KV \u5206\u79bb\u7684\u7b56\u7565\uff0c\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u4f1a\u901a\u8fc7 value \u7684\u9608\u503c\u662f\u5426\u8fbe\u5230\u914d\u7f6e\u7684\u5927\u5c0f\uff0c\u6765\u9009\u62e9\u5b83\u662f\u5426 KV \u5206\u79bb\u3002\u5728\u6b64\u4e4b\u5916\uff0c\u8fd8\u652f\u6301\u4e86\u5176\u4ed6\u7684\u4e00\u4e9b\u529f\u80fd\uff0c\u5305\u62ec value log \u7684\u7a7a\u95f4\u56de\u6536 GC\u3001TTL \u548c check point \u3001Merge Op\u3001AsyncRestore \u8fd8\u6709 Table API \u4ee5\u53ca\u5176\u4ed6\u7684\u4e00\u4e9b\u4f18\u5316\u3002<\/p>\n<p>\u8fd9\u91cc\u4e3b\u8981\u8bb2\u4e00\u4e0b\u5b83\u5728 GC \u4e0a\u9762\u7684\u652f\u6301\u3002\u56e0\u4e3a\u5728\u975e KV \u5206\u79bb\u7684\u6a21\u5f0f\u4e0b\uff0c\u5b83\u7684 compaction \u7684\u8fc7\u7a0b\u4e2d\uff0c\u5c31\u5df2\u7ecf\u4f1a\u5c06\u5404\u4e2a SST \u6587\u4ef6\u4e2d\u91cd\u590d\u7684 key \u6240\u5bf9\u5e94\u7684\u6570\u636e\u53ea\u4fdd\u7559\u6700\u65b0\u7684\u90a3\u4e00\u4efd\uff0c\u6240\u4ee5\u5728 compaction \u8fc7\u7a0b\u4e2d\uff0c\u8fd9\u4e2a\u7a7a\u95f4\u5c31\u5df2\u7ecf\u88ab\u81ea\u7136\u800c\u7136\u7684\u56de\u6536\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668872\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u4f46\u662f\u5728\u5206\u79bb\u7684\u6a21\u5f0f\u4e0b\uff0c\u5728\u53c2\u4e0e compaction \u8fc7\u7a0b\u4e2d\uff0c\u5b83\u5176\u5b9e\u5728 LSM tree \u53ea\u6709 key \u548c value Address \u7684\u90e8\u5206\u53bb\u53c2\u4e0e compaction\u3002\u6240\u4ee5\uff0c\u5f53\u8fd9\u4e2a value \u4e0d\u518d\u88ab\u5f15\u7528\u7684\u65f6\u5019\uff0c\u5b83\u5c31\u5df2\u7ecf\u6210\u4e3a\u5783\u573e\u88ab\u653e\u5728 value log \u91cc\u9762\uff0c\u800c\u4e14\u9700\u8981\u4e00\u4e2a\u6e05\u7406\u673a\u5236\u5c06\u5176\u6e05\u7406\u3002<\/p>\n<p>\u8fd9\u91cc\u7684\u601d\u8def\u6709\u5f88\u591a\u79cd\uff0c\u6211\u4eec\u73b0\u5728\u7684\u65b9\u6848\u91cc\u9762\u91c7\u7528\u7684\u662f\u4e00\u79cd\u88ab\u52a8\u56de\u6536\u7684\u7b56\u7565\uff0c\u5c31\u662f\u5728 compaction \u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u4f1a\u53bb\u8bb0\u5f55\u6bcf\u4e00\u4e2a value log \u6240\u5bf9\u5e94\u7684 value \u5360\u7528\u7684\u5783\u573e\u6bd4\u4f8b\u3002\u56e0\u4e3a\u6211\u4eec\u5728 compaction \u7684\u8fc7\u7a0b\u4e2d\u5c31\u53ef\u4ee5\u77e5\u9053\u54ea\u4e9b key \u88ab compact \u6389\uff0c\u6240\u4ee5\u6211\u4eec\u77e5\u9053\u8fd9\u4e2a key \u6240\u5bf9\u5e94\u7684 value log \u7684\u6587\u4ef6\uff0c\u56e0\u6b64\u6211\u4eec\u5c31\u80fd\u5b8c\u5168\u7edf\u8ba1\u51fa\u8fd9\u6837\u7684\u6570\u636e\u3002\u5f53 value log \u5783\u573e\u5360\u6bd4\u8fbe\u5230\u767e\u5206\u4e4b\u767e\u7684\u65f6\u5019\uff0c\u5c31\u53ef\u4ee5\u5b89\u5168\u7684\u5c06\u8fd9\u4e2a value log \u76f4\u63a5\u6e05\u7406\u6389\u3002<\/p>\n<p>\u4f46\u662f\u8fd8\u4f1a\u5b58\u5728\u53e6\u5916\u4e00\u4e2a\u95ee\u9898\uff0c value log \u91cc\u9762\u6709\u53ef\u80fd\u67d0\u4e00\u4e9b key \u8fdf\u8fdf\u7684\u6ca1\u6709\u53c2\u4e0e compaction \u8fc7\u7a0b\uff0c\u5c31\u4f1a\u9020\u6210 value log \u6b8b\u7559\u4e0b\u6765\uff0c\u5bfc\u81f4\u4e00\u5b9a\u7a0b\u5ea6\u7684\u7a7a\u95f4\u653e\u5927\u3002\u5bf9\u4e8e\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u4e3b\u8981\u662f\u901a\u8fc7\u8bbe\u7f6e\u4e00\u4e2a\u6e05\u7406\u7684\u9608\u503c\u89e3\u51b3\uff0c\u6bd4\u5982\u5f53\u8fbe\u5230\u767e\u5206\u4e4b\u4e5d\u5341\u7684\u65f6\u5019\uff0c\u6211\u4eec\u5c31\u9700\u8981\u901a\u8fc7\u8fd9\u4e9b\u5783\u573e\u5360\u6bd4\u8fc7\u9ad8\u7684\u6587\u4ef6\u53bb\u53cd\u5411\u67e5\u627e SST \u6587\u4ef6\uff0c\u7136\u540e\u5c06\u8fd9\u4e9b SST \u6587\u4ef6\u4f5c\u4e3a\u4e0b\u4e00\u6b21 compaction \u7684\u5019\u9009\uff0c\u7136\u540e\u5c06\u5b83\u8fdb\u884c compaction \u3002\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u5b83\u5c31\u80fd\u5c06\u8fd9\u4e9b value log \u7684\u7a7a\u95f4\u56de\u6536\u6389\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668873\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u4ece\u4ee5\u4e0a\u6765\u770b\uff0c\u8fd9\u5957 AntKV \u7684\u5b58\u50a8\u7cfb\u7edf\u7684\u4e3b\u8981\u7684\u4f18\u52bf\u5728\u4e8e\uff0c\u9996\u5148\u964d\u4f4e\u4e86 compaction \u7684\u8bfb\u5199\u653e\u5927\uff0c\u5bf9\u4e8e\u7ebf\u4e0a\u7684\u6548\u679c\u6765\u770b\uff0c\u6574\u4f53\u7684 get put \u7684\u8017\u65f6\u66f4\u52a0\u7a33\u5b9a\uff0c\u4e5f\u76f8\u6bd4\u4e8e\u4e4b\u524d\u66f4\u4f4e\u3002\u7b2c\u4e8c\u70b9\u662f\u66f4\u9ad8\u6548\u7684\u7f13\u5b58\uff0c\u56e0\u4e3a\u5b83\u964d\u4f4e\u7684 LSM tree \u672c\u8eab\u6709\u5927\u5c0f\uff0c\u6240\u4ee5\u5b83\u66f4\u591a\u7684 key \u53ef\u4ee5\u88ab\u7f13\u5b58\u5728 block cache \u91cc\u9762\uff0c\u4ee5\u53ca\u81ea\u9002\u5e94\u7684 KV \u5206\u79bb, \u9002\u7528\u591a\u79cd\u573a\u666f\u3002<\/p>\n<p>\u5b83\u7684\u4e3b\u8981\u52a3\u52bf\u5728\u4e8e scan \u7684\u6548\u7387\u4f1a\u53d7\u5f71\u54cd\uff0c\u56e0\u4e3a scan \u5728 KV \u5206\u79bb\u6a21\u5f0f\u4e2d\uff0c\u53ef\u80fd\u4f1a\u53d8\u6210\u4e00\u4e2a\u968f\u673a IO\uff0c\u4ee5\u53ca\u5b83\u7684\u6570\u636e\u6e05\u7406\u4f1a\u5ef6\u540e\uff0c\u4e8e\u662f\u5e26\u6765\u989d\u5916\u7684\u78c1\u76d8\u7684\u5f00\u9500\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668874\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u4ece AntKV \u8fd9\u4e2a\u89d2\u5ea6\u6765\u53bb\u6d4b\u8bd5\u6574\u4f53\u7684\u541e\u5410\u8bfb\u5199\u6d4b\u8bd5\u7684\u8bdd\uff0c\u76f8\u6bd4\u4e8e RocksDB \u6765\u8bf4\uff0c\u8fbe\u5230\u4e86\u4e24\u5230\u56db\u500d\u5de6\u53f3\u7684\u63d0\u5347\uff0c\u6bd4\u8f83\u53ef\u89c2\u3002<\/p>\n<h2><strong>\u4e8c\uff0e\u4f18\u5316\u4e0e\u9002\u914d<\/strong><\/h2>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668875\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u4ece\u5f15\u64ce\u4fa7\u53bb\u548c AntKV \u9002\u914d\uff0c\u6211\u4eec\u4e3b\u8981\u5b9e\u73b0\u4e86 AntKV \u7684 statebackend\uff0cBackend \u5b9e\u73b0\u4e86\u63d2\u4ef6\u5316\u6539\u9020\uff0c\u9632\u6b62\u548c RocksDB \u7684 JNI \u7684\u547d\u540d\u51b2\u7a81\uff0c\u5e76\u4e14\u5728 checkpoint \u9636\u6bb5\u53bb\u5bf9 AntKV \u6240\u4ea7\u751f\u7684\u989d\u5916\u7684 value log \u7684\u6570\u636e\u6587\u4ef6\u8fdb\u884c\u6301\u4e45\u5316\u7ba1\u7406\u3002\u5176\u4ed6\u7684\u4f18\u5316\u5305\u62ec scan \u7684 prefetch \u4f18\u5316\uff0c\u4e3a\u4e86\u89e3\u51b3\u5728\u5b83 scan \u4ea7\u751f\u968f\u673a IO \u7684\u60c5\u51b5\u4e0b\u5982\u4f55\u63d0\u5347\u5b83 scan \u7684\u6027\u80fd\u7684\u95ee\u9898\u3001\u4ee5\u53ca\u57fa\u4e8e learned index \u7684\u8fd9\u79cd O(1) \u7684\u67e5\u8be2\u4f18\u5316\u80fd\u591f\u6781\u5927\u7684\u63d0\u5347\u5b83\u7684 get \u7684\u65f6\u6548\u6027\u3001\u4ee5\u53ca\u5728 Statebackend \u91cc\u9762\u5185\u7f6e\u652f\u6301 TTL \u7684\u529f\u80fd\u3002<\/p>\n<h3><strong>1. No Unique Key Join \u4f18\u5316<\/strong><\/h3>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668876\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u4ee5\u4e0a\u662f\u4ece AntKV \u7684\u89d2\u5ea6\u6765\u770b\u5b58\u50a8\u5f15\u64ce\u3002\u4ece\u5f15\u64ce\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u4ee5\u4e0a\u662f\u4e00\u4e2a\u975e\u5e38\u5178\u578b\u7684 No Unique Key Join \u7684\u4e00\u4e2a case\u3002\u6211\u4eec\u77e5\u9053\u5728 Flink \u91cc\u9762\uff0c\u5728\u5b83 Join \u7684\u573a\u666f\u4e2d\uff0c\u5b83\u4f1a\u6839\u636e\u4f60 Join Input \u6d41\u662f\u5426\u5305\u542b Unique Key \u4ee5\u53ca Join Key \u662f\u5426\u5305\u542b Unique Key \u53bb\u9009\u62e9\u5408\u9002\u7684\u72b6\u6001\u5b58\u50a8\u7684\u65b9\u5f0f\u3002<\/p>\n<p>\u4ee5\u56fe\u4e3a\u4f8b\uff0cInput1 \u662f\u4e00\u4e2a\u6ca1\u6709 Unique Key \u7684\u6d41\uff0c Input2 \u662f\u4e00\u4e2a Join key \u5305\u542b\u4e86 Unique Key \u7684\u6d41\u3002\u5f53 Input1 \u8fdb\u6765\u7684\u65f6\u5019\uff0c\u5982\u679c\u5b83\u53bb\u67e5\u8be2 Input2 \u7684\u6570\u636e\uff0c\u5b83\u7684\u67e5\u8be2\u7684\u6a21\u5f0f\u662f\u4ee5 Join Key \u53bb\u67e5\u627e\u8fd9\u79cd\u6a21\u5f0f\u3002\u6240\u4ee5\u5b83\u7684\u6a21\u5f0f\u662f\u6bd4\u8f83\u7b26\u5408\u4e8e AntKV \u8fd9\u6837\u7684\u4f18\u5316\uff0c\u5b83\u662f\u4e00\u4e2a\u5c0f Key \u5927 Value \u7684 Pattern\uff0c\u5b83\u7684\u67e5\u8be2\u8fc7\u7a0b\u4e5f\u53ea\u9700\u8981 get \u70b9\u67e5\u3002\u800c\u5f53\u6211 Input2 \u7684\u6570\u636e\u6765\u7684\u65f6\u5019\uff0c\u5b83\u7684\u5b58\u50a8\u6a21\u5f0f\u662f\u6309\u7167 Join Key \u52a0 Record \u62fc\u63a5\u6210\u4e00\u4e2a\u5927 Key\uff0c\u800c\u5b83\u7684 Value \u662f\u4e00\u4e2a\u8868\u793a\u8fd9\u4e2a Record \u7684\u884c\u6570\uff0c\u6240\u4ee5\u5728\u6574\u4f53\u5b58\u50a8\u7684 Pattern \u4e0b\uff0c\u5b83\u770b\u8d77\u6765\u5c31\u4f1a\u6bd4\u8f83\u5947\u602a\u3002\u7136\u540e\u5b83\u5728\u67e5\u8be2\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5c31\u9700\u8981\u6309\u7167 Join key \u5148\u53bb seek \u5230\u67d0\u4e00\u4e2a\u524d\u7f00\uff0c\u7136\u540e\u5728 iterator \u53bb\u904d\u5386\u51fa\u8fd9\u4e2a Pattern \u4e0b\u6240\u6709\u7684 Record\u3002\u9996\u5148\uff0c\u8fd9\u4e2a\u67e5\u8be2\u6548\u7387\u5728\u975e KV \u5206\u79bb\u6a21\u5f0f\u6216\u8005\u5728 RocksDB \u7684\u573a\u666f\u4e2d\uff0c\u5b83\u7684\u6548\u679c\u5c31\u4e0d\u597d\u3002\u8fd9\u662f\u56e0\u4e3a\uff0c\u9996\u5148\u8fd9\u79cd\u5927 Key \u5728\u67e5\u627e\u7684\u8fc7\u7a0b\u4e2d\u5c31\u6d89\u53ca\u6bd4\u8f83\u5927\u7684\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u6bd4\u8f83\u4ee5\u53ca\u5b83\u7684\u7f13\u5b58\u6548\u7387\u4f1a\u6bd4\u8f83\u4f4e\u3002<\/p>\n<p>\u90a3\u4e48\u6709\u6ca1\u6709\u529e\u6cd5\u5c06\u8fd9\u79cd Pattern \u548c KV \u5206\u79bb\u7684\u4f18\u5316\u5339\u914d\u4e0a\u53bb\u5462\uff1f\u6211\u4eec\u5c31\u60f3\u529e\u6cd5\u53bb\u5c06\u5b58\u50a8\u683c\u5f0f\u6539\u6210\u4e00\u4e2a\u6bd4\u8f83\u5408\u9002\u7684\u65b9\u5f0f\u3002\u5982\u56fe\u7684 Join Key \u62fc\u5bf9\u5e94\u7684\u4e00\u4e2a List Record \uff0c\u5c31\u662f\u4e00\u79cd\u8bbe\u8ba1\u65b9\u5f0f\u3002\u7136\u540e\uff0c\u6211\u4eec\u5728\u7ebf\u4e0a\u4e5f\u91c7\u7528\u4e86\u591a\u79cd\u65b9\u5f0f\u53bb\u6d4b\u8bd5\u8fd9\u79cd\u573a\u666f\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668877\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u65b9\u6848\u5982\u56fe\u4e2d\u663e\u793a\u7684\uff0c\u5b83\u4f7f\u7528\u7684\u662f\u4e00\u4e2a Value State\uff0c\u7136\u540e Join Key \u5c31\u5bf9\u5e94\u5230\u4e00\u4e2a List Record\uff0c\u8868\u793a\u8fd9\u4e2a Join Key \u4e0b\u6240\u6709\u51fa\u73b0\u7684 Record\u3002\u65b9\u6848\u4e8c\u662f Map State \uff0c\u5b83\u4e5f\u662f\u4ee5 Join Key \u4f5c\u4e3a\u524d\u7f00\uff0c\u518d\u52a0\u4e0a Record \u7684 MD5 \u503c\u62fc\u63a5\u6210\u4e00\u4e2a Key\uff0c\u7136\u540e\u5b83\u7684 Value \u662f Record \u4ee5\u53ca\u5b83\u51fa\u73b0\u7684\u6b21\u6570\u3002\u65b9\u6848\u4e09\u662f\u4f7f\u7528\u7684\u4e00\u4e2a List State \u7684 Value \uff0c\u5c31\u662f\u5728\u6211\u5199\u5165\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6709\u4e00\u6761 Record\uff0cAppend \u5199\u8fdb\u53bb\u7684\u8fd9\u6837\u7684\u6548\u679c\u3002\u4ece\u6211\u4eec\u7ebf\u4e0a\u6d4b\u8bd5\u7684\u6548\u679c\u6765\u770b\uff0c\u5c31\u662f\u8fd9\u4e09\u79cd\u65b9\u6848\uff0c\u90fd\u770b\u5230\u5b83\u7684 Join Key \u7684 Value Pattern \u90fd\u662f\u5c0f Key \u5e26 Value \u7684\u8fd9\u79cd\u6a21\u5f0f\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u65b9\u6848\u4e00\u3001\u65b9\u6848\u4e8c\u3001\u65b9\u6848\u4e09\u7684 TPS \u5c31\u662f\u4f18\u4e8e\u539f\u59cb\u65b9\u6848\u7684\u3002\u800c\u65b9\u6848\u4e00\u7684\u6574\u4f53\u541e\u5410\u5e94\u8be5\u80fd\u8fbe\u5230\u539f\u59cb\u65b9\u6848\u7684\u56db\u500d\u4ee5\u4e0a\uff0c\u6240\u4ee5\u6211\u4eec\u6700\u7ec8\u9009\u62e9\u4e86\u65b9\u6848\u4e00\u7684\u5b9e\u73b0\u65b9\u6848\u3002\u4ee5\u4e0a\u5c31\u662f\u8682\u8681\u5728\u72b6\u6001\u540e\u7aef\u4e0a\u7684\u6f14\u8fdb\u3002<\/p>\n<h3><strong>2. \u72b6\u6001\u95ee\u9898\u4f18\u5316<\/strong><\/h3>\n<h4>2.1 \u5c0f\u6587\u4ef6\u95ee\u9898<\/h4>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668878\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u5c0f\u6587\u4ef6\u7684\u95ee\u9898\u5728\u793e\u533a\u4e5f\u662f\u4e00\u4e2a\u6bd4\u8f83\u6709\u540d\u7684\u95ee\u9898\uff0c\u5b83\u4e3b\u8981\u5728\u6211\u4eec\u5185\u90e8\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e24\u4e2a\u95ee\u9898\u3002\u7b2c\u4e00\u4e2a\u95ee\u9898\u662f\u4f1a\u5bfc\u81f4\u6211\u4eec\u7ebf\u4e0a\u51fa\u73b0\u4e00\u4e9b Task \u6301\u7eed deploying\uff0c\u5b83\u6ca1\u6709\u529e\u6cd5\u6062\u590d\u3002\u7b2c\u4e8c\u4e2a\u95ee\u9898\u662f\u5c0f\u6587\u4ef6\u5bfc\u81f4\u6211\u4eec\u7684\u6587\u4ef6\u6570\u6269\u5927\u6301\u7eed\u4e0d\u8db3\uff0c\u6301\u7eed\u5f71\u54cd DFS \u7684\u7a33\u5b9a\u6027\u3002<\/p>\n<p>\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e0b\u4e3a\u4ec0\u4e48\u4f1a\u6709\u5c0f\u6587\u4ef6\u7684\u95ee\u9898\u3002\u5c0f\u6587\u4ef6\u7684\u95ee\u9898\u53ef\u80fd\u4e3b\u8981\u548c\u589e\u91cf Checkpoint \u7684\u65b9\u6848\u6709\u5173\uff0c\u56e0\u4e3a\u589e\u91cf Checkpoint \u672c\u8eab\u5c31\u662f\u95ee\u9898\u3002<\/p>\n<h4>2.2 \u589e\u91cf Checkpoint \u95ee\u9898<\/h4>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668879\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u589e\u91cf Checkpoint \u7684\u8fc7\u7a0b\u4e2d\u8981\u4e0a\u4f20\u5168\u91cf\u6587\u4ef6\u7684\u4f18\u5316\u65b9\u6848\uff0c\u4f46\u662f\u5b83\u5728\u589e\u91cf Checkpoint \u7684\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u5c06\u6bcf\u4e00\u4e2a Task \u5728 Checkpoint \u4e4b\u524d\uff0c\u5c06 RocksDB \u5148 Flush \u751f\u6210\u672c\u6b21 Checkpoint \u4e4b\u95f4\u7684\u65b0\u589e\u7684 SST \u6587\u4ef6\uff0c\u7136\u540e\u518d\u5c06\u8fd9\u4e9b\u672c\u6b21\u548c\u4e0a\u6b21\u4e4b\u95f4 Diff \u51fa\u6765\u7684 SST \u6587\u4ef6\u4e0a\u4f20\u5230\u8fdc\u7a0b\uff0c\u4f46\u662f\u8fd9\u4e9b SST \u6587\u4ef6\u901a\u5e38\u4e0d\u4f1a\u5f88\u5927\u3002\u5728\u6301\u7eed\u7684\u8fc7\u7a0b\u4e2d\uff0c\u8fd9\u4e9b SST \u6587\u4ef6\u5c31\u4f1a\u5bfc\u81f4\u4ea7\u751f\u5f88\u591a\u7684\u5c0f\u6587\u4ef6\u3002<\/p>\n<h3><strong>3. \u5bf9\u72b6\u6001\u6062\u590d\u7684\u5f71\u54cd<\/strong><\/h3>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668880\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u7136\u540e\u6211\u4eec\u518d\u6765\u770b\u4e3a\u4ec0\u4e48\u8fd9\u79cd\u5c0f\u6587\u4ef6\u4f1a\u5bfc\u81f4 Task deploy \u7684\u95ee\u9898\u3002\u9996\u5148\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u5728 Checkpoint \u7684\u8fc7\u7a0b\u4e2d\uff0c\u5b83\u662f\u4e00\u4e2a\u589e\u91cf\u7684\u8fc7\u7a0b\uff0c\u6bd4\u5982\u6211\u4eec\u56fe\u4e2d\u7684 Subtask Manager \u5728\u505a Checkpoint \u7684\u8fc7\u7a0b\u4e2d\uff0c\u5b83\u53ef\u80fd\u5728 value logs \u91cc\u6709\u4e00\u4e2a\u5c0f\u4e8e 20KB \u7684\u5c0f\u6587\u4ef6\uff0c\u90a3\u4e48\u5b83\u5728\u73b0\u6709\u7684\u673a\u5236\u91cc\u5c31\u4f1a\u76f4\u63a5\u5c06\u8fd9\u4e2a\u6570\u636e\u4f20\u5230 Job Manager \u4e2d\uff0c\u7531 Job Manager \u5199\u5165\u5230 Metadata \u6587\u4ef6\u91cc\u9762\uff0c\u8fd9\u4e5f\u662f\u4e00\u79cd\u4f18\u5316\u673a\u5236\uff0c\u4e3a\u4e86\u65e0\u9700\u5355\u72ec\u751f\u6210\u4e00\u4e2a\u6587\u4ef6\uff0c\u5c06\u90a3\u4e9b\u7279\u522b\u5c0f\u7684\u6587\u4ef6\u76f4\u63a5\u653e\u5230 Job Manager \u7684 MataData \u3002\u800c\u5728\u8fd9\u4e2a\u6301\u7eed\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5b83\u53ef\u80fd\u4f1a\u4ea7\u751f\u6bd4\u8f83\u591a\u7684\u5c0f\u6587\u4ef6\uff0c\u5e76\u8bb0\u5f55\u5728 Matadata Data \u91cc\u9762\u3002\u56e0\u4e3a\u505a Checkpoint \u662f\u4e00\u4e2a\u589e\u91cf\u7684\u8fc7\u7a0b\uff0c\u4f46\u662f\u5728\u6062\u590d\u7684\u8fc7\u7a0b\u4e2d\uff0c\u662f\u4e00\u4e2a FullRestore \u7684\u8fc7\u7a0b\uff0c\u5c31\u53ef\u80fd\u4f1a\u5b58\u5728\u63d0\u4ea4 Task \u5230 Task Executor \u4e0a\uff0c\u90e8\u7f72\u7684\u8fd9\u4e2a Descriptor \u5305\u542b\u4e86 ByteStream Statehandle \u4ee5\u53ca File Stream Handle\u3002\u8fd9\u4e9b ByteStream Statehandle \u5728\u6301\u7eed\u7684\u589e\u91cf\u3001Checkpoint \u7684\u8fc7\u7a0b\u4e2d\uff0c\u53ef\u80fd\u7d2f\u52a0\u8d85\u8fc7 RPC \u9650\u5236\u7684\u5927\u5c0f\uff0c\u6700\u7ec8\u5bfc\u81f4\u4efb\u52a1\u5728\u8dd1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u56e0\u4e3a\u6302\u4e00\u6b21\u800c\u5bfc\u81f4\u518d\u4e5f\u6062\u590d\u4e0d\u4e86\u3002\u56e0\u4e3a\u8981\u4f20\u8f93\u7684 State Handle \u5df2\u7ecf\u8d85\u8fc7\u4e86 RPC \u7684\u9650\u5236\u3002\u8fd9\u4e2a\u95ee\u9898\u53ef\u80fd\u4f1a\u548c\u6211\u4eec\u7684\u8fd9\u5957 KV \u5206\u79bb\u7684\u67b6\u6784\u6709\u4e00\u5b9a\u7684\u5173\u7cfb\u3002\u56e0\u4e3a\u5728\u975e KV \u5206\u79bb\u7684\u6a21\u5f0f\u4e0b\uff0c\u5b83\u7684 SST \u4f1a\u6301\u7eed\u7684\u505a compaction\u3002\u4f46\u662f\u5728 KV \u5206\u79bb\u6a21\u5f0f\u4e0b\u7684 Value Log \u7684 Compaction \u7684\u9891\u7387\u4f1a\u4f4e\u4e8e SST \u7684 Compaction \u7684\u9891\u7387\uff0c\u56e0\u4e3a\u672c\u8eab\u7684\u76ee\u7684\u662f\u4e3a\u4e86\u51cf\u5c11 Value Log \u7684 Compaction \u7684\u9891\u7387\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668881\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u6837\u7684\u95ee\u9898\uff0c\u6211\u4eec\u53c2\u8003\u4e86\u793e\u533a\u4e4b\u524d\u5206\u4eab\u7684\u4e00\u5957\u57fa\u4e8e Segment \u589e\u91cf\u7684 Checkpoint \u65b9\u6848\u3002\u8fd9\u5957\u65b9\u6848\u7684\u4e3b\u8981\u601d\u8def\u5c31\u5728\u4e8e\u6bcf\u4e00\u4e2a Task \u5728\u505a Checkpoint \u8fc7\u7a0b\u4e2d\uff0c\u5e76\u4e0d\u4f1a\u4e3a\u6bcf\u4e00\u4e2a SST \u6587\u4ef6\u90fd\u751f\u6210\u4e00\u4e2a\u8fdc\u7a0b\u7684 DFS \u6587\u4ef6\uff0c\u800c\u662f\u8ba9\u6bcf\u4e00\u4e2a Task \u4e0a Checkpoint \u8fc7\u7a0b\u4e2d\u7684\u8981\u4e0a\u4f20\u7684\u6587\u4ef6\uff0c\u5c3d\u53ef\u80fd\u590d\u7528\u4e00\u4e2a\u8fdc\u7aef\u7684\u6587\u4ef6\uff0c\u5e76\u4e14\u8bb0\u5f55\u6bcf\u4e00\u4e2a SST \u6587\u4ef6\u3002\u5728\u8fd9\u4e2a\u6587\u4ef6\u4e2d\u6240\u5360\u7528\u7684 Offset \u548c\u5bf9\u5e94\u7684 Length\uff0c\u53bb\u627e\u5230\u5b83\u6240\u5bf9\u5e94\u7684 Segment\u3002\u7136\u540e\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u5c31\u5df2\u7ecf\u80fd\u591f\u975e\u5e38\u597d\u7684\u7f13\u89e3\u5c0f\u6587\u4ef6\u7684\u95ee\u9898\u3002<\/p>\n<p>\u6211\u4eec\u4e0a\u7ebf\u4e4b\u540e\u53d1\u73b0\u5c0f\u6587\u4ef6\u7684\u95ee\u9898\u867d\u7136\u89e3\u51b3\u4e86\uff0c\u4f46\u662f\u5b83\u8fd8\u662f\u4f1a\u6709\u7a7a\u95f4\u653e\u5927\u7684\u95ee\u9898\u3002\u5982\u4e0a\u9762\u7684\u4efb\u52a1\u91cc\u9762\uff0c\u5b83\u4ece\u4efb\u52a1\u4fa7\u6c47\u62a5\u4e0a\u6765\uff0c\u8fd9\u4e2a\u4efb\u52a1\u53ea\u662f\u5360\u7528\u4e86 38 G \u5de6\u53f3\u7684\u72b6\u6001\u5927\u5c0f\u3002\u4f46\u5b9e\u9645\u4e0a\uff0c\u4ece DFS \u6d4b\u8bd5, Checkpoint \u76ee\u5f55\u6240\u5360\u7528\u7684\u7a7a\u95f4\u53ef\u80fd\u8fbe\u5230\u4e86\u5b83\u539f\u59cb\u5927\u5c0f\u7684\u4e03\u767e\u591a\u500d\u5de6\u53f3\uff0c\u5e76\u4e14\u5b83\u7684\u6587\u4ef6\u6570\u4e5f\u6bd4\u8f83\u591a\u3002\u6240\u4ee5\uff0c\u8fd9\u79cd case \u5e76\u6ca1\u6709\u8fbe\u5230\u6211\u4eec\u6240\u9884\u671f\u7684\u6548\u679c\u3002<\/p>\n<h3><strong>4. \u57fa\u4e8e Segment \u589e\u91cf Checkpoint \u65b9\u6848<\/strong><\/h3>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668882\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u6709\u4e00\u4e2a\u95ee\u9898\u5728\u4e8e\uff0c\u53ef\u80fd\u5728\u67d0\u4e00\u4e9b DFS \u7684\u6587\u4ef6\u91cc\u9762\uff0c\u5b83\u7684\u6587\u4ef6\u6301\u7eed\u5728\u88ab\u5f15\u7528\u3002\u6bd4\u5982\u6211\u4eec\u8fd9\u4e2a\u6587\u4ef6\u91cc\u9762\u7684\u7b2c\u4e00\u4e2a\u6587\u4ef6\u7684\u56db\u53f7 SST\uff0c\u5b83\u6301\u7eed\u88ab\u540e\u9762\u7684 checkpoint \u5f15\u7528\uff0c\u5e76\u6ca1\u6709\u88ab GC \u6216\u8005\u88ab\u5408\u5e76\u6210\u53e6\u5916\u4e00\u4e2a SST \u6587\u4ef6\u3002\u8fd9\u6837\u7684\u8bdd\u5c31\u5bfc\u81f4\u6574\u4e2a\u6587\u4ef6\u7684\u5927\u5c0f\u65e0\u6cd5\u91ca\u653e\uff0c\u6700\u7ec8\u5bfc\u81f4\u5b83\u7684\u6587\u4ef6\u7a7a\u95f4\u653e\u5927\u548c\u6587\u4ef6\u6570\u65e0\u6cd5\u6d88\u51cf\u7684\u95ee\u9898\u3002<\/p>\n<p>\u73b0\u5728\u8981\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u7684\u601d\u8def\u975e\u5e38\u7b80\u5355\uff0c\u7c7b\u4f3c\u4e8e\u6211\u4eec\u4e4b\u524d\u5728 AntKV \u91cc\u9762 Value Log \u91ca\u653e\u7684\u601d\u8def\uff0c\u5c31\u662f\u5728\u5b58\u50a8\u7a7a\u95f4\u548c IO \u4e4b\u95f4\uff0c\u5c3d\u53ef\u80fd\u5bfb\u627e\u5230\u4e00\u4e2a\u5e73\u8861\uff0c\u6bd4\u5982\u5728\u4e0a\u4f20\u7684\u65f6\u5019\u68c0\u6d4b\u8fd9\u4e2a DFS \u6587\u4ef6\u7684\u6709\u6548\u6bd4\u4f8b\uff0c\u5f53\u6587\u4ef6\u6709\u6548\u6bd4\u4f8b\u4f4e\u4e8e\u591a\u5c11\u7684\u65f6\u5019\uff0c\u6211\u4eec\u5c31\u4f1a\u5c06\u8fd9\u4e2a\u539f\u59cb\u6587\u4ef6\u4e2d\u7684 Segment \u4f5c\u4e3a\u672c\u6b21 Checkpoint \u4e2d\u65b0\u589e\u7684 SST \u4e0a\u4f20\u5230\u8fdc\u7a0b\u3002\u8fd9\u6837\u7684\u8bdd\uff0c\u539f\u59cb\u7684 DFS \u7684\u6587\u4ef6\u5c31\u53ef\u4ee5\u76f4\u63a5\u88ab\u6e05\u7406\u6389\u3002<\/p>\n<h3><strong>5. \u5c0f\u6587\u4ef6\u5408\u5e76\u5b58\u50a8\u7a7a\u95f4\u653e\u5927\u95ee\u9898<\/strong><\/h3>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668883\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u5728\u4e0a\u7ebf\u4e4b\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u5b83\u7684\u6548\u679c\uff0c\u5b9e\u9645\u5b58\u50a8\u91cf\u4e0b\u964d\u5230\u4e86 Full State \u76841.4\u500d\u5de6\u53f3\uff0c\u6587\u4ef6\u6570\u4e5f\u5927\u5927\u51cf\u5c11\u4e86\u3002<\/p>\n<h3><strong>6. \u5927\u4efb\u52a1 Union State restore \u6027\u80fd\u74f6\u9888<\/strong><\/h3>\n<p>\u7b2c\u4e8c\u4e2a\u95ee\u9898\u662f\u5927\u4efb\u52a1\u7684 Union State restore \u7684\u95ee\u9898\u3002 Union State restore \u7684\u8fc7\u7a0b\u5176\u5b9e\u662f\u9700\u8981\u6bcf\u4e00\u4e2a TM \u53bb Union State\uff0c\u5b83\u672c\u8d28\u7684\u610f\u601d\u5c31\u662f\u6bcf\u4e00\u4e2a TM \u5728\u505a Checkpoint \u7684\u8fc7\u7a0b\u4e2d\uff0c\u6bcf\u4e00\u4e2a sub task \u4e0a\u4f20\u81ea\u5df1\u7684\u8fd9\u90e8\u5206\u72b6\u6001\uff0c\u4f46\u662f\u5728\u6062\u590d\u8fc7\u7a0b\u4e2d\uff0c\u6bcf\u4e00\u4e2a subtask \u90fd\u80fd\u6062\u590d\u5230\u539f\u59cb\u7684\u72b6\u6001\u3002\u5f53\u6211\u4eec\u4ee5\u8fd9\u79cd\u72b6\u6001\u6062\u590d\u7684\u65f6\u5019\uff0c\u5c31\u53ef\u4ee5\u770b\u5230\u5b83\u662f\u4e00\u79cd All-to-all \u6a21\u5f0f\u7684\u6062\u590d\u3002\u5f53\u6211\u4eec\u7684\u5e76\u53d1\u6bd4\u8f83\u5927\u7684\u65f6\u5019\uff0c\u6bd4\u5982\u6211\u4eec\u73b0\u5728\u8fd9\u79cd\u662f\u57fa\u4e8e File StateHandle \u7684\u6a21\u5f0f\u6062\u590d\uff0c\u5b83\u7684 DFS \u5c31\u4f1a\u6210\u4e3a\u74f6\u9888\u3002\u4ece\u6211\u4eec\u7ebf\u4e0a\u7684\u4efb\u52a1\u6765\u770b\uff0c\u6bd4\u5982\u6709\u4e24\u5343\u591a\u5de6\u53f3\u7684\u5e76\u53d1\uff0c\u5b83\u6574\u4e2a\u6062\u590d\u65f6\u957f\u53ef\u80fd\u4f1a\u8fbe\u5230\u534a\u4e2a\u5c0f\u65f6\u5de6\u53f3\u7684\u957f\u5ea6\uff0c\u8fd9\u4e2a\u5728\u4e1a\u52a1\u4e0a\u662f\u65e0\u6cd5\u5bb9\u5fcd\u7684\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668884\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u6211\u4eec\u4e5f\u5c1d\u8bd5\u53e6\u4e00\u79cd\u65b9\u5f0f\uff0c\u6bd4\u5982\u53bb\u8c03\u4f4e\u9608\u503c\uff0c\u964d\u4f4e\u6587\u4ef6\u6570\u3002\u5982\u679c\u6211\u4eec\u8ba9\u5b83\u76f4\u63a5\u5199\u5230 Job Manager \u7684 Matter Data \u91cc\u9762\uff0c\u8fd9\u6837\u5c31\u53ea\u6709\u4e00\u4e2a\u6587\u4ef6\u53bb\u6062\u590d\uff0c\u4f46\u662f\u5b83\u7684 Job Manager \u4e5f\u4f1a\u6210\u4e3a\u74f6\u9888\uff0c\u5b83\u4f1a\u9891\u7e41\u7684\u5728\u6062\u590d\u7684\u8fc7\u7a0b\u4e2d\u53bb OOM \u3002OOM \u7684\u539f\u56e0\u4e5f\u5f88\u7b80\u5355\uff0c\u56e0\u4e3a\u6211\u4eec\u653e\u5728\u4e86\u5b83\u7684 ByteStreamStateHandle \uff0c\u90a3\u4e48\u5728\u63d0\u4ea4\u4efb\u52a1\u7684\u65f6\u5019\uff0cTDD \u7684\u5927\u5c0f\u4f1a\u5360\u7528 Job Manager \u7684\u5185\u5b58\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668885\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u4ece\u6211\u4eec\u63d0\u4ea4\u7684\u5b9e\u9645\u60c5\u51b5\u6765\u770b\uff0c\u5b83\u5728\u6062\u590d\u7684\u8fc7\u7a0b\u4e2d\uff0c\u8fd9\u4e2a StreamStateHandle \u53ef\u80fd\u4f1a\u5360\u5230\u767e\u4e07\u7ea7\u522b\u7684\u5927\u5c0f\uff0c\u6700\u7ec8 JM \u6839\u672c\u65e0\u6cd5\u6062\u590d\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668886\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u601d\u8def\uff0c\u7b2c\u4e00\u70b9\u662f\u5728 JobManager \u4fa7\uff0c\u6211\u4eec\u53ea\u53bb\u521b\u5efa\u4e00\u4efd\u539f\u59cb\u7684 Statehandle\uff0c\u5c31\u4e0d\u7528\u7ed9\u6bcf\u4e00\u4e2a Task \u90fd\u590d\u5236\u4e00\u4efd\uff0c\u7b2c\u4e8c\u70b9\u662f\u5229\u7528 Blob Server \u53bb\u4f20\u8f93 TDD \u4e2d\u7684\u5927\u72b6\u6001\u5bf9\u8c61\u3002<\/p>\n<p>\u8fd9\u4e2a Blob Server \u5728 Job Manager \u91cc\u9762\u672c\u8eab\u5c31\u5728\u7528\uff0c\u6240\u4ee5\u6211\u4eec\u4e5f\u662f\u5229\u7528\u4e86\u8fd9\u6837\u7684\u4e00\u4e2a\u673a\u5236\u53bb\u4f20\u8f93\u5927\u5bf9\u8c61\u3002\u56e0\u4e3a Blob Server \u672c\u8eab\u4e5f\u662f\u5728\u505a\u8fd9\u6837\u7684\u4e8b\u60c5\u3002<\/p>\n<p>\u7b2c\u4e09\u70b9\u662f\u5728\u540c\u4e00\u4e2a TaskManager \u4e0a\u9762\uff0c\u6211\u4eec\u53ea\u53bb\u62c9\u53d6\u4e00\u6b21 Union State \u7684\u72b6\u6001\uff0c\u6570\u636e Task \u4e4b\u95f4\u7684\u521d\u59cb\u5316\u662f\u5171\u4eab\u7684\u3002\u7ecf\u8fc7\u4ee5\u4e0a\u7684\u4e00\u7cfb\u5217\u7684\u4f18\u5316\uff0c\u6700\u7ec8\u5b83\u539f\u6765\u534a\u5c0f\u65f6\u7684\u91cd\u542f\u4efb\u52a1\uff0c\u73b0\u5728\u53ef\u4ee5\u6ca1\u6709\u538b\u529b\u5730\u91cd\u542f\uff0c\u800c\u4e14 JM \u5185\u5b58\u4e5f\u4e0d\u518d\u662f\u5b83\u7684\u74f6\u9888\u3002<\/p>\n<h3><strong>7. \u4efb\u52a1 Rescale \u95ee\u9898<\/strong><\/h3>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668887\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u6700\u540e\u4e00\u4e2a\u95ee\u9898\u662f\u4efb\u52a1 Rescale \u7684\u95ee\u9898\uff0c\u793e\u533a\u4e5f\u5728\u6301\u7eed\u4f18\u5316\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n<p>\u6211\u4eec\u5728\u5f88\u65e9\u7684\u65f6\u5019\u5c31\u5df2\u7ecf\u5728\u5c1d\u8bd5\u793e\u533a\u7684 DeleteRange API \u7684\u4f18\u5316\u3002\u6211\u4eec\u53d1\u73b0\u5728 DeleteRange API \u7684\u6a21\u5f0f\u4e0b\uff0cInitialDB \u7684\u9009\u62e9\u53ef\u4ee5\u6709\u66f4\u5bbd\u677e\u7684\u9650\u5236\u3002<\/p>\n<p>\u56e0\u4e3a\u5728\u65e9\u671f\u7684\u7248\u672c\u4e2d\uff0c\u5b83\u7684 Rescale \u7684\u8fc7\u7a0b\u5c31\u662f\u6bcf\u4e2a Task \u5148\u53bb\u4e0b\u8f7d\u5c5e\u4e8e\u6211\u7684 Handle \u6570\u636e\uff0c\u4e0b\u8f7d\u56de\u6765\u4e4b\u540e\uff0c\u9700\u8981\u5c06\u6570\u636e\u5bfc\u5165\u8fdb\u53bb\uff0c\u7136\u540e\u518d\u5c06\u4e0d\u5c5e\u4e8e\u6211\u7684 DB \u6570\u636e\u5220\u9664\u6389\u3002\u539f\u6765\u5b9e\u73b0\u8fd9\u79cd\u5220\u9664\u662f\u901a\u8fc7\u904d\u5386\u6765\u5220\u9664\uff0c\u6240\u4ee5\u5b83\u9700\u8981\u4e00\u4e2a\u9ad8\u6bd4\u4f8b\u7684 DB \u4f5c\u4e3a\u5b83\u7684 base\uff0c\u5426\u5219\u5b83\u7684\u5220\u9664\u4ee3\u4ef7\u4e5f\u662f\u5f88\u9ad8\u7684\u3002\u4f46\u662f\u73b0\u5728\u5728 DeleteRange \u8fd9\u79cd API \u7684\u6a21\u5f0f\u4e0b\uff0c\u4ece\u53f3\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u5728\u6211\u4eec\u7684\u6d4b\u8bd5\u4e2d\uff0c\u5b83 Rescale \u7684\u8017\u65f6\u5206\u5e03\u91cc\u9762 DeleteRange \u6240\u5360\u7528\u7684\u65f6\u95f4\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1\uff0c\u57fa\u672c\u90fd\u662f\u6beb\u79d2\u7ea7\u522b\u3002\u6240\u4ee5\u5728 DeleteRange \u6a21\u5f0f\u4e0b\uff0c\u6211\u4eec\u5e94\u8be5\u5c3d\u53ef\u80fd\u7684\u9009\u62e9\u4e00\u4e2a DB \u4f5c\u4e3a\u5b83\u7684 baseDB\u3002<\/p>\n<p>\u7b2c\u4e8c\u70b9\u662f\uff0c\u6211\u4eec\u53d1\u73b0\u5728 Rescale \u7684\u8fc7\u7a0b\u4e2d\uff0c\u5b83\u78c1\u76d8\u7684\u5f00\u9500\u53ef\u80fd\u4f1a\u8fbe\u5230\u539f\u59cb\u7684\u4e24\u5230\u4e09\u500d\u3002\u56e0\u4e3a\u6211\u4eec\u8dd1\u7684\u662f\u4e00\u4e2a\u4e91\u5316\u73af\u5883\uff0c\u5bf9\u4e8e\u78c1\u76d8\u6709\u6bd4\u8f83\u9ad8\u7684\u9650\u5236\uff0c\u6240\u4ee5\u6211\u4eec\u5bf9\u4e8e\u6bcf\u4e00\u4e2a Worker \u90fd\u6709\u78c1\u76d8\u76d1\u63a7\uff0c\u5f53\u5b83\u78c1\u76d8\u8d85\u8fc7\u67d0\u4e2a\u503c\u7684\u65f6\u5019\uff0c\u5c31\u53ef\u80fd\u4f1a\u89e6\u53d1 Kill \u7684\u673a\u5236\uff0c\u8ba9\u5b83\u91ca\u653e\u6389\uff0c\u5426\u5219\u7a33\u5b9a\u6027\u5c31\u65e0\u6cd5\u5f97\u5230\u4fdd\u969c\u3002\u4f46\u662f\u5728 Rescale \u7684\u8fc7\u7a0b\u4e2d\uff0c\u4ee5\u4e0a\u56fe\u4e3a\u4f8b\uff0c\u5b83\u5728\u6062\u590d\u7684\u8fc7\u7a0b\u4e2d\uff0c\u56db\u6269\u5230\u516b\u4e2a\u573a\u666f\u4e2d\uff0c\u6bcf\u4e00\u4e2a\u539f\u59cb\u7684 Handle \u6bd4\u59821\u523010\u90e8\u5206\u7684\u72b6\u6001\u4f1a\u88ab1\u52305\u548c5\u523010\u8fd9\u4e24\u90e8\u5206\u90fd\u4e0b\u8f7d\u3002\u8fd9\u6837\u7684\u8bdd\uff0c\u72b6\u6001\u5728\u6062\u590d\u7684\u8fc7\u7a0b\u4e2d\u5b83\u662f Double \u7684\uff0c\u5e76\u4e14\u53ef\u80fd\u7531\u4e8e InitialDB \u9009\u62e9\u7684\u5e76\u4e0d\u5408\u9002\u5bfc\u81f4\u6211\u5728 Open \u65f6\u521b\u5efa\u4e00\u4e2a\u5168\u65b0\u7684 DB \u5c06\u539f\u59cb\u7684\u6570\u636e\u5168\u90e8\u5bfc\u5165\u8fdb\u53bb\uff0c\u8fd9\u6837\u5c31\u53ef\u80fd\u4f1a\u8fbe\u5230\u4e24\u5230\u4e09\u500d\u7684\u5b58\u50a8\u5f00\u9500\u3002<\/p>\n<p>\u8981\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u7b2c\u4e00\u70b9\u5c31\u662f\u521a\u521a\u6211\u4eec\u8bf4\u5230\u7684\uff0cDeleteRange InitialDB \u7684\u9009\u62e9\u3002\u7b2c\u4e8c\u4e2a\u70b9\u662f\u6211\u4eec\u5728\u6062\u590d\u7684\u8fc7\u7a0b\u4e2d\u4f1a\u53bb\u505a\u78c1\u76d8\u7684\u4e00\u5b9a\u5f39\u6027\uff0c\u63d0\u4f9b\u4e86\u78c1\u76d8\u4e00\u5b9a\u7684\u5f39\u6027\u80fd\u529b\uff0c\u4e0d\u8ba9\u5b83\u5728 Rescale \u7684\u8fc7\u7a0b\u4e2d\u56e0\u4e3a\u6062\u590d\u7684\u8fc7\u7a0b\u76f4\u63a5\u5c06\u4e00\u4e2a Worker \u5e72\u6389\u3002\u7b2c\u4e09\u4e2a\u662f\u5c1d\u8bd5\u4f7f\u7528 SST ingest API \u53bb\u5b9e\u73b0\u5e38\u91cf\u65f6\u95f4\u7684 Rescale\uff0c\u5bf9\u4e8e\u8fd9\u4e2a\u529f\u80fd\uff0c\u793e\u533a\u4e5f\u5728\u505a\u8fd9\u6837\u7684\u5c1d\u8bd5\u3002\u5728\u6211\u4eec\u5185\u90e8\u7684\u5b9e\u73b0\u8fc7\u7a0b\u4e2d\uff0c\u7b2c\u4e00\u70b9\u6700\u5f00\u59cb\u5b9e\u73b0\u7684\u4e5f\u662f\u7c7b\u4f3c\u4e8e\u793e\u533a\u4e4b\u524d\u7684\u65b9\u6848\uff0c\u5c31\u662f\u5728\u6062\u590d\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5c06\u539f\u59cb\u7684 DB \u53bb\u904d\u5386\uff0c\u7136\u540e\u901a\u8fc7 SST writer \u7684 API \u53bb\u5199\u51fa\u56fe\u91cc\u7684\u6d4b\u8bd5\u7ed3\u679c\u3002\u53ef\u4ee5\u770b\u5230\uff0c\u5b83\u7684\u4e3b\u8981\u8017\u65f6\u8fd8\u662f\u5728\u4e8e\u539f\u59cb\u7684 DB \u904d\u5386\u548c Put \u7684\u5f00\u9500\u4e0a\uff0c\u6240\u4ee5\u901a\u8fc7 SST writer \u8fd9\u6837\u7684\u65b9\u5f0f\uff0c\u8fd8\u662f\u4e0d\u80fd\u89e3\u51b3\u95ee\u9898\u3002\u6240\u4ee5\u6211\u4eec\u4e5f\u5728\u770b\u793e\u533a\u73b0\u6709\u7684\u65b9\u6848\uff0c\u4ee5\u53ca\u6211\u4eec\u5185\u90e8\u7684 AntKV \u540c\u5b66\u52aa\u529b\u53bb\u5c06\u6574\u4f53\u7684\u8017\u65f6\u5c3d\u53ef\u80fd\u7684\u964d\u4e0b\u6765\u3002<\/p>\n<h2><strong>\u4e09\uff0e\u672a\u6765\u5c55\u671b<\/strong><\/h2>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668888\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u672a\u6765\u5c55\u671b\u4e3b\u8981\u5206\u4e3a\u4e24\u65b9\u9762\u3002<\/p>\n<p>\u4e00\u65b9\u9762\u662f\u671f\u671b\u80fd\u591f\u5728\u73b0\u6709\u7684\u72b6\u6001\u540e\u7aef\u4e0a\uff0c\u5b9e\u73b0\u66f4\u5feb\u7684 Failover\u548c Rescale \u7684\u80fd\u529b\u3002\u7b2c\u4e8c\u5757\u662f\u57fa\u4e8e\u6211\u4eec\u73b0\u5728\u7684 AntKV \u7684\u8fd9\u5957\u5b58\u50a8\u5f15\u64ce\u7684\u7279\u6027\uff0c\u53bb\u505a\u51fa\u66f4\u591a\u7684\u7b97\u5b50\u7ea7\u522b\u7684\u6027\u80fd\u4f18\u5316\uff0c\u5305\u62ec Join \u573a\u666f\u7684\u4f18\u5316\uff0c\u4ee5\u53ca\u5728 Windows \u4e0a\u7684\u573a\u666f\u4e5f\u4f1a\u53bb\u505a\u8fd9\u6837\u7684\u63a2\u7d22\u3002<\/p>\n<p>\u53e6\u4e00\u65b9\u9762\u662f\u964d\u4f4e\u672c\u5730\u5b58\u50a8\u7684\u4f9d\u8d56\uff0c\u56e0\u4e3a\u4e3b\u6d41\u7684\u8fd8\u662f\u5728\u8fc1\u5f80\u4e91\u5316\u73af\u5883\uff0c\u6240\u4ee5\u5bf9\u4e8e\u672c\u5730\u5b58\u50a8\u7684\u4f9d\u8d56\u4e5f\u5c06\u4f1a\u6210\u4e3a\u4e00\u4e2a\u95ee\u9898\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668889\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u5176\u6b21\u662f\u90e8\u5206\u8ba1\u7b97\u4e0b\u6c89\u5b58\u50a8\u5f15\u64ce\uff0c\u6211\u4eec\u73b0\u5728\u4e5f\u5728\u63a2\u7d22 Paimon \u6570\u636e\u6e56\u4ea7\u54c1\uff0c\u5b83\u4e5f\u662f\u57fa\u4e8e LSM tree \u7684\u6e56\u5b58\u50a8\u3002\u4ece\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u5b83\u6240\u652f\u6301\u7684\u662f\u6bd4\u8f83\u7075\u6d3b\u7684\u53bb\u5b9a\u4e49\u4e24\u4e2a SST \u6587\u4ef6\u5408\u5e76\uff0c\u5b83\u7684 key \u5408\u5e76\u7684 Merge engine\uff0c\u4ee5\u53ca\u73b0\u5728\u5df2\u7ecf\u652f\u6301\u7684 Aggregation \u7684 Merge engine\uff0c\u5728\u751f\u4ea7\u4e1a\u52a1\u4e2d\u6bd4\u8f83\u7b80\u5355\u7684\u805a\u5408\u573a\u666f\u5c31\u5df2\u7ecf\u53ef\u4ee5\u901a\u8fc7\u8fd9\u79cd\u6a21\u5f0f\u73a9\u8f6c\u8d77\u6765\u3002<\/p>\n<p>\u5b83\u7684\u597d\u5904\u5728\u4e8e\uff0c\u56e0\u4e3a\u6709\u5f88\u591a\u4e1a\u52a1\u5728 Flink \u91cc\u9762\u505a\u805a\u5408\u7684\u65f6\u5019\uff0c\u9700\u8981 Flink \u72b6\u6001\u53bb\u5e2e\u5b83\u5b58\u50a8\u5168\u91cf\u7684\u6570\u636e\u3002\u4f46\u662f\u6211\u4eec\u4e0d\u63a8\u8350\u5b83\u5c06 State\u4f5c\u4e3a\u4e00\u4e2a\u6301\u4e45\u5316\u7684\u5b58\u50a8\u3002\u7136\u800c\u5728\u6570\u636e\u6e56\u91cc\u9762\uff0c\u5b83\u5b8c\u5168\u53ef\u4ee5\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u56e0\u4e3a\u5728\u8ba1\u7b97\u5b58\u50a8\u7aef\u7684 Merge \u8fc7\u7a0b\u4e2d\uff0c\u5c31\u5df2\u7ecf\u88ab\u5b8c\u6210\u4e86\u3002<\/p>\n<p>\u53e6\u5916\u4e00\u4e2a\u597d\u5904\u5728\u4e8e\uff0c\u8fd9\u79cd Merge \u7684\u8fc7\u7a0b\u662f\u5927\u6279\u91cf\u7684\u53bb\u505a\u7684\uff0c\u5b83\u4f1a\u6bd4\u539f\u59cb\u7684\u901a\u8fc7 Flink State \u7684 Record \u7ea7\u522b\u53bb Get Put \u7684\u8fd9\u79cd\u65b9\u5f0f\u7684\u6027\u80fd\u4f1a\u66f4\u597d\u3002\u4f46\u662f\u5b83\u7684\u4ee3\u4ef7\u4e5f\u662f\u4f1a\u7528\u4e00\u5b9a\u7684\u65f6\u5ef6\u53bb\u6362\u6574\u4f53\u7684\u541e\u5410\uff0c\u5bf9\u4e8e\u90a3\u4e9b\u53ef\u4ee5\u63a5\u53d7\u8fd9\u6837\u7684\u65f6\u5ef6\u5f00\u9500\u7684\u4e1a\u52a1\u573a\u666f\uff0c\u6211\u4eec\u5df2\u7ecf\u5728\u5c1d\u8bd5\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\u53bb\u63a5\u5165\u8fd9\u79cd\u4e1a\u52a1\uff0c\u6765\u6ee1\u8db3\u4ed6\u4eec\u7684\u4e1a\u52a1\u9700\u6c42\u3002<\/p>\n<h2>Flink Forward Asia 2023<\/h2>\n<p>\u672c\u5c4a Flink Forward Asia \u66f4\u591a\u7cbe\u5f69\u5185\u5bb9\uff0c\u53ef\u5fae\u4fe1\u626b\u63cf\u56fe\u7247\u4e8c\u7ef4\u7801\u89c2\u770b\u5168\u90e8\u8bae\u9898\u7684\u89c6\u9891\u56de\u653e\u53ca FFA 2023 \u5cf0\u4f1a\u8d44\u6599\uff01<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044503584\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<h2>\u66f4\u591a\u5185\u5bb9<\/h2>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043814703\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<h2>\u6d3b\u52a8\u63a8\u8350<\/h2>\n<p>\u963f\u91cc\u4e91\u57fa\u4e8e Apache Flink \u6784\u5efa\u7684\u4f01\u4e1a\u7ea7\u4ea7\u54c1-\u5b9e\u65f6\u8ba1\u7b97 Flink \u7248\u73b0\u5f00\u542f\u6d3b\u52a8\uff1a<br \/>59 \u5143\u8bd5\u7528 \u5b9e\u65f6\u8ba1\u7b97 Flink \u7248\uff083000CU*\u5c0f\u65f6\uff0c3 \u4e2a\u6708\u5185\uff09<br \/>\u4e86\u89e3\u6d3b\u52a8\u8be6\u60c5\uff1a<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=nBnyPuXWFNH0sa1pqwWqjQ%3D%3D.1E36CXI8oaH38SINpctuZ7A7FA%2BHb8j1LjalTKnyHHsOH8ptEuMS5PkCCS7Bok4W\" rel=\"noopener noreferrer\">https:\/\/free.aliyun.com\/?pipCode=sc<\/a><\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"407\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbuqf\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000044668866\">https:\/\/segmentfault.com\/a\/1190000044668866<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u6574\u7406\u81ea\u8682\u8681\u96c6\u56e2\u5b9e\u65f6\u8ba1\u7b97\u7ec4\u6280\u672f\u4e13\u5bb6\u95f5\u6587\u4fca\u5728 FFA 2023 \u6838\u5fc3\u6280\u672f\uff08\u4e00\uff09\u4e2d \u7684\u5206\u4eab\uff0c\u5185\u5bb9\u5173\u4e8e\u8682\u8681\u6d41\u573a\u666f\u72b6 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10008414","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008414","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10008414"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008414\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008414"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008414"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008414"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}