{"id":97682,"date":"2026-08-30T00:24:45","date_gmt":"2026-08-29T16:24:45","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/97682.html"},"modified":"2026-08-30T00:24:45","modified_gmt":"2026-08-29T16:24:45","slug":"%e5%9b%be%e8%a7%a3-fluss%ef%bc%88%e4%ba%8c%ef%bc%89%ef%bc%9a%e5%ad%98%e5%82%a8%e5%bc%95%e6%93%8e%e5%8f%8c%e5%bc%95%e6%93%8e-logstore-%e4%b8%8e-kvstore","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/97682.html","title":{"rendered":"\u56fe\u89e3 Fluss\uff08\u4e8c\uff09\uff1a\u5b58\u50a8\u5f15\u64ce\u53cc\u5f15\u64ce \u2014\u2014 LogStore \u4e0e KvStore"},"content":{"rendered":"<h2>\u56fe\u89e3 Fluss&#xff08;\u4e8c&#xff09;&#xff1a;\u5b58\u50a8\u5f15\u64ce\u53cc\u5f15\u64ce \u2014\u2014 LogStore \u4e0e KvStore<\/h2>\n<p>\u9605\u8bfb\u672c\u6587\u4f60\u5c06\u4e86\u89e3&#xff1a; LogSegment \u7684\u7a00\u758f\u7d22\u5f15\u4e3a\u4ec0\u4e48\u548c Kafka \u957f\u5f97\u4e00\u6837\u3001PK \u8868&#034;\u5148\u5199 WAL \u518d\u5199 RocksDB&#034;\u7684\u987a\u5e8f\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u53cd\u3001RocksDB \u90a3\u51e0\u4e2a\u5173\u952e\u53c2\u6570\u7684\u542b\u4e49\u3001\u4ee5\u53ca\u4e09\u79cd Merge Engine \u8be5\u600e\u4e48\u9009\u3002<\/p>\n<p>\u914d\u5957\u56fe\u8868&#xff1a;class-02-storage-engine\u3001class-04-merge-engine<\/p>\n<p>\u96be\u5ea6&#xff1a;\u2b50\u2b50\u2b50 | \u9002\u5408\u4eba\u7fa4&#xff1a;\u8981\u505a\u8868\u8bbe\u8ba1\u4e0e\u6027\u80fd\u8c03\u4f18\u7684\u5f00\u53d1<\/p>\n<hr \/>\n<h3>\u4e00\u3001\u573a\u666f&#xff1a;\u4e00\u6b21&#034;\u52a0\u4e2a\u5b57\u6bb5&#034;\u5f15\u53d1\u7684\u4e8b\u6545<\/h3>\n<p>\u5148\u770b\u4e00\u4e2a\u771f\u5b9e\u573a\u666f\u3002<\/p>\n<p>\u67d0\u98ce\u63a7\u56e2\u961f\u6709\u4e00\u5f20\u7528\u6237\u884c\u4e3a\u8868&#xff0c;200 \u591a\u4e2a\u5b57\u6bb5&#xff0c;\u65e5\u5747 20 \u4ebf\u6761\u3002\u4ed6\u4eec\u7528 Flink \u505a\u5b9e\u65f6\u7279\u5f81\u8ba1\u7b97&#xff0c;\u5b9e\u9645\u53ea\u7528\u5230\u5176\u4e2d 5 \u4e2a\u5b57\u6bb5&#xff1a;<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> user_id<span class=\"token punctuation\">,<\/span> event_type<span class=\"token punctuation\">,<\/span> amount<span class=\"token punctuation\">,<\/span> device_id<span class=\"token punctuation\">,<\/span> event_time<br \/>\n<span class=\"token keyword\">FROM<\/span> user_behavior<br \/>\n<span class=\"token keyword\">WHERE<\/span> event_type <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;PAY&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4f46\u5e95\u5c42\u662f Kafka&#xff0c;Flink \u7684 Source \u5fc5\u987b\u628a\u6574\u884c 200 \u4e2a\u5b57\u6bb5\u5168\u90e8\u62c9\u4e0b\u6765&#xff0c;\u518d\u5728\u5185\u5b58\u91cc\u505a\u6295\u5f71\u548c\u8fc7\u6ee4\u3002\u7ed3\u679c&#xff1a;<\/p>\n<ul>\n<li>\u7f51\u7edc\u5e26\u5bbd&#xff1a;\u9ad8\u5cf0\u671f 12 Gbps&#xff0c;\u5176\u4e2d 97% \u662f\u65e0\u6548\u5b57\u6bb5<\/li>\n<li>Flink TM \u5185\u5b58&#xff1a;\u7ecf\u5e38 OOM&#xff0c;\u56e0\u4e3a\u53cd\u5e8f\u5217\u5316\u540e\u7684\u5b8c\u6574\u5bf9\u8c61\u592a\u5927<\/li>\n<li>\u7aef\u5230\u7aef\u5ef6\u8fdf&#xff1a;P99 \u8fbe\u5230 3 \u79d2<\/li>\n<\/ul>\n<p>\u540e\u6765\u4ed6\u4eec\u52a0\u4e86\u7b2c\u4e8c\u4e2a\u9700\u6c42&#xff1a;\u98ce\u63a7\u89c4\u5219\u8981\u67e5\u7528\u6237\u6700\u8fd1 30 \u5929\u7684\u7d2f\u8ba1\u4ea4\u6613\u989d\u3002\u539f\u6765\u7684\u505a\u6cd5\u662f\u628a\u7ed3\u679c\u5199\u5230 Redis&#xff0c;\u4f46\u7ef4\u8868\u5173\u8054\u53c8\u5f15\u5165\u4e86\u65b0\u7684\u7f51\u7edc\u5f80\u8fd4\u3002<\/p>\n<p>\u8fd9\u4e24\u4e2a\u9700\u6c42&#xff0c;\u672c\u8d28\u4e0a\u662f\u5728\u95ee\u4e24\u4ef6\u4e8b&#xff1a;<\/p>\n<li>\u80fd\u4e0d\u80fd\u53ea\u8bfb\u9700\u8981\u7684\u5217&#xff1f;&#xff08;\u5217\u5f0f\u5b58\u50a8 &#043; \u5217\u88c1\u526a&#xff09;<\/li>\n<li>\u80fd\u4e0d\u80fd\u6309\u4e3b\u952e\u76f4\u63a5\u67e5&#xff1f;&#xff08;KV \u5b58\u50a8 &#043; \u70b9\u67e5&#xff09;<\/li>\n<p>Fluss \u7684\u7b54\u6848\u662f&#xff1a;\u540c\u4e00\u5f20\u8868&#xff0c;\u540c\u65f6\u7ed9\u4f60 LogStore \u548c KvStore \u4e24\u5957\u5f15\u64ce\u3002<\/p>\n<p>\u8fd9\u4e00\u7bc7\u6211\u4eec\u5c31\u62c6\u5f00\u770b\u8fd9\u4e24\u5957\u5f15\u64ce\u3002<\/p>\n<hr \/>\n<h3>\u4e8c\u3001\u56fe 1&#xff1a;\u5b58\u50a8\u5f15\u64ce\u7c7b\u56fe<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260829162442-6a9307cace8bf.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8fd9\u5f20\u56fe\u5206\u4e86\u4e24\u4e2a\u5305&#xff1a;\u84dd\u8272\u662f LogStore&#xff08;\u65e5\u5fd7\u5b58\u50a8&#xff09;&#xff0c;\u7c73\u8272\u662f KvStore&#xff08;\u952e\u503c\u5b58\u50a8&#xff09;\u3002<\/p>\n<h4>2.1 LogStore&#xff1a;\u548c Kafka \u540c\u6784\u7684\u8bbe\u8ba1<\/h4>\n<p>\u5148\u770b\u7c7b\u5173\u7cfb\u94fe&#xff1a;<\/p>\n<p>LogManager  *&#8211;  LogTablet  *&#8211;  LogSegment  *&#8211;  OffsetIndex<br \/>\n                                          *&#8211;  TimeIndex<br \/>\n                 LogTablet  ..&gt;  LogLoader        (\u542f\u52a8\u6062\u590d)<\/p>\n<p>\u9010\u4e2a\u8bf4\u660e&#xff1a;<\/p>\n<table>\n<tr>\u7c7b\u804c\u8d23\u7c7b\u6bd4<\/tr>\n<tbody>\n<tr>\n<td>LogManager<\/td>\n<td>\u7ba1\u7406\u4e00\u4e2a TabletServer \u4e0a\u6240\u6709 LogTablet \u7684\u751f\u547d\u5468\u671f<\/td>\n<td>Kafka \u7684 LogManager<\/td>\n<\/tr>\n<tr>\n<td>LogTablet<\/td>\n<td>\u5355\u4e2a Tablet \u7684\u65e5\u5fd7&#xff0c;\u6301\u6709 ConcurrentSkipListMap&lt;Long, LogSegment&gt;<\/td>\n<td>Kafka \u7684 Log&#xff08;\u5206\u533a&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>LogSegment<\/td>\n<td>\u5355\u4e2a\u65e5\u5fd7\u6bb5 &#061; .log &#043; .index &#043; .timeindex<\/td>\n<td>Kafka \u7684 LogSegment<\/td>\n<\/tr>\n<tr>\n<td>OffsetIndex<\/td>\n<td>\u7a00\u758f\u7684 offset \u2192 \u7269\u7406\u4f4d\u7f6e\u7d22\u5f15<\/td>\n<td>Kafka \u7684 OffsetIndex<\/td>\n<\/tr>\n<tr>\n<td>TimeIndex<\/td>\n<td>\u7a00\u758f\u7684 timestamp \u2192 offset \u7d22\u5f15<\/td>\n<td>Kafka \u7684 TimeIndex<\/td>\n<\/tr>\n<tr>\n<td>LogLoader<\/td>\n<td>\u542f\u52a8\u65f6\u626b\u63cf\u76ee\u5f55\u3001\u6062\u590d\u6bb5\u3001\u6821\u9a8c\u5b8c\u6574\u6027<\/td>\n<td>Kafka \u7684 LogLoader<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u719f\u6089 Kafka \u7684\u540c\u5b66\u770b\u5230\u8fd9\u5f20\u8868\u5e94\u8be5\u4f1a\u5fc3\u4e00\u7b11\u2014\u2014Fluss \u7684 LogStore \u5728\u8bbe\u8ba1\u4e0a\u51e0\u4e4e\u548c Kafka \u7684\u5206\u533a\u5b58\u50a8\u662f\u4e00\u4e00\u5bf9\u5e94\u7684\u3002\u8fd9\u4e0d\u662f\u5de7\u5408&#xff0c;\u56e0\u4e3a&#034;\u8ffd\u52a0\u5199 &#043; \u7a00\u758f\u7d22\u5f15 &#043; \u987a\u5e8f\u8bfb&#034;\u5df2\u7ecf\u88ab\u8bc1\u660e\u662f\u65e5\u5fd7\u5b58\u50a8\u7684\u6700\u4f18\u89e3&#xff0c;\u6ca1\u5fc5\u8981\u91cd\u65b0\u53d1\u660e\u3002<\/p>\n<h5>LogSegment \u7684\u4e09\u4e2a\u6587\u4ef6<\/h5>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LogSegment<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">long<\/span> baseOffset<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u6bb5\u7684\u8d77\u59cb offset<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">File<\/span> logFile<span class=\"token punctuation\">;<\/span>         <span class=\"token comment\">\/\/ 00000000000000000000.log<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">OffsetIndex<\/span> offsetIndex<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ &#8230;index<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">TimeIndex<\/span> timeIndex<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ &#8230;timeindex<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">LogAppendInfo<\/span> <span class=\"token function\">append<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">LogRecordsBatch<\/span> batch<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">LogReadInfo<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">long<\/span> offset<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> maxSize<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u78c1\u76d8\u4e0a\u7684\u6837\u5b50&#xff1a;<\/p>\n<p>bucket-0\/<br \/>\n\u251c\u2500\u2500 00000000000000000000.log        1073741824  (1GB&#xff0c;\u6eda\u52a8\u9608\u503c)<br \/>\n\u251c\u2500\u2500 00000000000000000000.index          1048576  (1MB&#xff0c;\u56fa\u5b9a\u5927\u5c0f)<br \/>\n\u251c\u2500\u2500 00000000000000000000.timeindex       524288<br \/>\n\u251c\u2500\u2500 00000000000000368944.log        843215678   (\u5f53\u524d\u6d3b\u8dc3\u6bb5)<br \/>\n\u251c\u2500\u2500 00000000000000368944.index<br \/>\n\u2514\u2500\u2500 00000000000000368944.timeindex<\/p>\n<p>\u6587\u4ef6\u540d\u5c31\u662f\u8be5\u6bb5\u7684\u8d77\u59cb offset&#xff0c;\u8fd9\u4e2a\u8bbe\u8ba1\u8ba9&#034;\u7ed9\u5b9a\u4e00\u4e2a offset&#xff0c;\u627e\u5230\u5b83\u5728\u54ea\u4e2a\u6bb5&#034;\u53d8\u6210\u4e00\u6b21\u5bf9 ConcurrentSkipListMap \u7684 floorEntry() \u67e5\u8be2&#xff0c;O(log n)\u3002<\/p>\n<h5>\u7a00\u758f\u7d22\u5f15&#xff1a;\u4e3a\u4ec0\u4e48\u4e0d\u5efa\u5168\u91cf\u7d22\u5f15&#xff1f;<\/h5>\n<p>OffsetIndex \u4e0d\u662f\u6bcf\u6761\u6d88\u606f\u90fd\u8bb0\u4e00\u6761\u7d22\u5f15&#xff0c;\u800c\u662f\u6bcf\u9694 N \u5b57\u8282\u8bb0\u4e00\u6761\u3002\u5047\u8bbe N &#061; 4096&#xff1a;<\/p>\n<p>\u7d22\u5f15\u9879&#xff1a;(\u76f8\u5bf9 offset, \u7269\u7406\u4f4d\u7f6e)<br \/>\n  (0,    0)<br \/>\n  (57,   4096)      \u2190 \u7b2c 57 \u6761\u6d88\u606f\u5728\u6587\u4ef6\u7684\u7b2c 4096 \u5b57\u8282<br \/>\n  (128,  8192)<br \/>\n  (201,  12288)<br \/>\n  &#8230;<\/p>\n<p>\u67e5 offset&#061;150 \u7684\u6d41\u7a0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">AbstractIndex<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">MappedByteBuffer<\/span> mmap<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u5185\u5b58\u6620\u5c04&#xff0c;\u96f6\u62f7\u8d1d<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">long<\/span> baseOffset<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token class-name\">OffsetPosition<\/span> <span class=\"token function\">lookup<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">long<\/span> key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5185\u90e8&#xff1a;\u4e8c\u5206\u67e5\u627e\u627e\u5230 &lt;&#061; 150 \u7684\u6700\u5927\u7d22\u5f15\u9879 (128, 8192)<\/span><br \/>\n    <span class=\"token comment\">\/\/      \u7136\u540e\u4ece\u6587\u4ef6 8192 \u5b57\u8282\u5904\u5f00\u59cb\u987a\u5e8f\u626b\u63cf&#xff0c;\u76f4\u5230\u627e\u5230 150<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6743\u8861&#xff1a;\u5168\u91cf\u7d22\u5f15\u67e5\u627e\u662f O(1) \u4f46\u7d22\u5f15\u6587\u4ef6\u4f1a\u548c\u6570\u636e\u4e00\u6837\u5927&#xff1b;\u7a00\u758f\u7d22\u5f15\u67e5\u627e\u662f O(log n) &#043; \u5c11\u91cf\u987a\u5e8f\u626b\u63cf&#xff0c;\u4f46\u7d22\u5f15\u53ea\u6709\u6570\u636e\u91cf\u7684\u5343\u5206\u4e4b\u4e00\u3002\u5bf9\u4e8e\u65e5\u5fd7\u8fd9\u79cd&#034;\u7edd\u5927\u591a\u6570\u60c5\u51b5\u90fd\u662f\u987a\u5e8f\u8bfb&#034;\u7684\u8bbf\u95ee\u6a21\u5f0f&#xff0c;\u7a00\u758f\u7d22\u5f15\u660e\u663e\u66f4\u4f18\u3002<\/p>\n<p>\u8fd9\u5c31\u662f\u56fe\u4e2d AbstractIndex \u7528 mmap \u5b57\u6bb5\u7684\u539f\u56e0\u2014\u2014\u7d22\u5f15\u6587\u4ef6\u7528 MappedByteBuffer \u5185\u5b58\u6620\u5c04&#xff0c;\u8bfb\u7d22\u5f15\u4e0d\u4ea7\u751f\u7cfb\u7edf\u8c03\u7528\u3002<\/p>\n<h4>2.2 KvStore&#xff1a;RocksDB \u7684\u5c01\u88c5<\/h4>\n<p>KvManager  *&#8211;  KvTablet  *&#8211;  RocksDBKv  ..&gt;  RocksDBConfig<br \/>\n                  KvTablet  ..&gt;  LogTablet        (\u4f5c\u4e3a WAL)<br \/>\n                  KvTablet  ..&gt;  WalRecovery      (\u6545\u969c\u6062\u590d)<\/p>\n<p>\u5173\u952e\u5728 KvTablet \u8fd9\u4e2a\u7c7b&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">KvTablet<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">RocksDBKv<\/span> rocksDB<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u5b9e\u9645\u5b58\u50a8<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">LogTablet<\/span> walLogTablet<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u6307\u5411\u540c\u4e00 Tablet \u7684 LogTablet<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> key<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> value<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> key<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">delete<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> key<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">recoverFromLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">LogTablet<\/span> logTablet<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u610f walLogTablet \u8fd9\u4e2a\u5b57\u6bb5\u2014\u2014\u8fd9\u662f\u7406\u89e3 PK \u8868\u7684\u5173\u952e\u3002<\/p>\n<p>\u56fe\u4e2d\u53f3\u4e0b\u89d2\u90a3\u6761\u6700\u91cd\u8981\u7684\u5173\u7cfb&#xff1a;<\/p>\n<p>LogTablet &lt;.. KvTablet : &#034;\u5199\u5165\u987a\u5e8f&#xff1a;\u5148 WAL \u540e RocksDB&#034;<\/p>\n<h5>\u4e3a\u4ec0\u4e48\u5fc5\u987b&#034;\u5148 WAL \u540e RocksDB&#034;&#xff1f;<\/h5>\n<p>\u56e0\u4e3a RocksDB \u81ea\u8eab\u7684 WAL \u548c Fluss \u7684\u526f\u672c\u673a\u5236\u5bf9\u4e0d\u4e0a\u3002<\/p>\n<p>\u5047\u8bbe\u6211\u4eec\u53ea\u7528 RocksDB&#xff08;\u4e0d\u5199 Fluss \u7684 LogTablet&#xff09;&#xff0c;\u4f1a\u53d1\u751f\u4ec0\u4e48&#xff1a;<\/p>\n<p>1. Leader \u5199\u5165 RocksDB \u6210\u529f<br \/>\n2. Leader \u5b95\u673a&#xff0c;\u8fd8\u6ca1\u6765\u5f97\u53ca\u540c\u6b65\u7ed9 Follower<br \/>\n3. Follower \u664b\u5347\u4e3a\u65b0 Leader<br \/>\n4. \u65b0 Leader \u7684 RocksDB \u91cc\u6ca1\u6709\u8fd9\u6761\u6570\u636e<br \/>\n5. Follower \u91cd\u542f\u540e&#xff0c;\u5982\u4f55\u8ffd\u5e73&#xff1f;\u2014\u2014 \u6ca1\u529e\u6cd5&#xff0c;\u56e0\u4e3a RocksDB \u7684 WAL \u662f\u672c\u5730\u7684&#xff0c;<br \/>\n   \u4e0d\u53c2\u4e0e\u526f\u672c\u590d\u5236&#xff0c;\u4e5f\u6ca1\u6709\u7edf\u4e00\u7684 offset \u6982\u5ff5<\/p>\n<p>\u6240\u4ee5 Fluss \u7684\u89e3\u6cd5\u662f&#xff1a;\u628a LogTablet \u5f53\u4f5c KvTablet \u7684\u5171\u4eab WAL\u3002<\/p>\n<p>\u5199\u5165\u987a\u5e8f&#xff1a;<br \/>\n  \u2460 LogTablet.append(batch)  \u2192 \u4ea7\u751f\u5168\u5c40\u9012\u589e offset&#xff0c;\u53c2\u4e0e ISR \u590d\u5236<br \/>\n  \u2461 RocksDBKv.put(k, v)      \u2192 \u66f4\u65b0\u672c\u5730 LSM \u6811&#xff0c;\u63d0\u4f9b\u70b9\u67e5\u80fd\u529b<\/p>\n<p>\u6062\u590d\u987a\u5e8f&#xff08;\u8282\u70b9\u91cd\u542f&#xff09;&#xff1a;<br \/>\n  \u2460 \u8bfb\u53d6 RocksDB \u7684\u6301\u4e45\u5316\u72b6\u6001<br \/>\n  \u2461 \u4ece RocksDB \u8bb0\u5f55\u7684 lastWrittenOffset \u5f00\u59cb&#xff0c;\u56de\u653e LogTablet \u4e2d\u4e4b\u540e\u7684\u8bb0\u5f55<\/p>\n<p>\u8fd9\u4e2a&#034;\u56de\u653e&#034;\u5c31\u662f\u56fe\u4e2d\u7684 WalRecovery&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">WalRecovery<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">recover<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">LogTablet<\/span> logTablet<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">RocksDBKv<\/span> kvStore<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">long<\/span> fromOffset<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4ece fromOffset \u626b\u63cf\u5230 LEO<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5bf9\u6bcf\u6761\u8bb0\u5f55\u91cd\u65b0\u6267\u884c KvTablet.put()<\/span><br \/>\n        <span class=\"token comment\">\/\/ RocksDB \u7684\u5199\u5165\u662f\u5e42\u7b49\u7684&#xff08;\u540c key \u8986\u76d6&#xff09;&#xff0c;\u6240\u4ee5\u91cd\u590d\u56de\u653e\u5b89\u5168<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u4e2a\u8bbe\u8ba1\u548c MySQL \u7684 redo log \/ HBase \u7684 WAL \u662f\u540c\u4e00\u4e2a\u601d\u60f3&#xff1a;\u7528\u4e00\u4efd\u987a\u5e8f\u5199\u65e5\u5fd7\u6765\u4fdd\u8bc1\u6301\u4e45\u6027&#xff0c;\u7528\u4e00\u4efd\u968f\u673a\u5199\u7ed3\u6784\u6765\u4fdd\u8bc1\u67e5\u8be2\u6027\u80fd\u3002<\/p>\n<h5>RocksDBConfig \u7684\u51e0\u4e2a\u5173\u952e\u53c2\u6570<\/h5>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">RocksDBConfig<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token constant\">BLOCK_CACHE_SIZE<\/span>   <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">256<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">1024<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">1024<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ 256MB<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token constant\">WRITE_BUFFER_SIZE<\/span>  <span class=\"token operator\">&#061;<\/span>  <span class=\"token number\">64<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">1024<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">1024<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/  64MB<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">double<\/span> <span class=\"token constant\">BLOOM_BITS_PER_KEY<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10.0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token constant\">NUM_LEVELS<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<table>\n<tr>\u53c2\u6570\u503c\u4f5c\u7528\u8c03\u4f18\u5efa\u8bae<\/tr>\n<tbody>\n<tr>\n<td>BLOCK_CACHE_SIZE<\/td>\n<td>256MB<\/td>\n<td>\u8bfb\u7f13\u5b58&#xff0c;\u7f13\u5b58\u89e3\u538b\u540e\u7684 SST block<\/td>\n<td>\u70b9\u67e5\u591a\u3001\u5185\u5b58\u8db3 \u2192 \u8c03\u5230 1-2GB<\/td>\n<\/tr>\n<tr>\n<td>WRITE_BUFFER_SIZE<\/td>\n<td>64MB<\/td>\n<td>MemTable \u5927\u5c0f&#xff0c;\u5199\u6ee1\u540e flush \u6210 L0<\/td>\n<td>\u5199\u5165\u91cf\u5927 \u2192 \u8c03\u5927&#xff0c;\u51cf\u5c11 flush \u6b21\u6570<\/td>\n<\/tr>\n<tr>\n<td>BLOOM_BITS_PER_KEY<\/td>\n<td>10.0<\/td>\n<td>\u5e03\u9686\u8fc7\u6ee4\u5668\u7cbe\u5ea6<\/td>\n<td>10 bits \u7684\u5047\u9633\u6027\u7387\u7ea6 1%&#xff0c;\u8db3\u591f<\/td>\n<\/tr>\n<tr>\n<td>NUM_LEVELS<\/td>\n<td>7<\/td>\n<td>LSM \u5c42\u6570<\/td>\n<td>\u4e00\u822c\u4e0d\u52a8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Bloom Filter \u5728\u8fd9\u91cc\u7684\u4f5c\u7528\u975e\u5e38\u5173\u952e&#xff0c;\u5b83\u76f4\u63a5\u51b3\u5b9a\u4e86&#034;\u67e5\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684 key&#034;\u7684\u4ee3\u4ef7&#xff1a;<\/p>\n<p>\u6ca1\u6709 Bloom Filter&#xff1a;\u67e5 key \u2192 MemTable \u672a\u547d\u4e2d \u2192 \u904d\u5386 L0 \u6240\u6709\u6587\u4ef6 \u2192 L1 \u2192 &#8230; \u2192 L6<br \/>\n                   \u6700\u574f\u60c5\u51b5\u4e0b\u8981\u8bfb 7 \u5c42\u7684\u591a\u4e2a SST \u6587\u4ef6&#xff0c;\u51e0\u5341\u6b21\u78c1\u76d8 IO<\/p>\n<p>\u6709 Bloom Filter&#xff1a;  \u67e5 key \u2192 MemTable \u672a\u547d\u4e2d \u2192 Bloom \u5224\u65ad&#034;\u4e00\u5b9a\u4e0d\u5b58\u5728&#034; \u2192 \u76f4\u63a5\u8fd4\u56de null<br \/>\n                   \u96f6\u6b21\u78c1\u76d8 IO<\/p>\n<p>\u5bf9\u4e8e\u7ef4\u8868\u5173\u8054\u8fd9\u79cd&#034;\u5927\u91cf key \u547d\u4e0d\u4e2d&#034;\u7684\u573a\u666f&#xff0c;Bloom Filter \u80fd\u628a P99 \u5ef6\u8fdf\u538b\u5230\u4e9a\u6beb\u79d2\u7ea7\u3002\u4e0b\u4e00\u8282\u8bb2 Lookup \u65f6\u5e8f\u56fe\u65f6\u4f1a\u518d\u770b\u5230\u5b83\u3002<\/p>\n<h4>2.3 \u56de\u5230\u573a\u666f&#xff1a;\u8fd9\u5957\u8bbe\u8ba1\u89e3\u51b3\u4e86\u4ec0\u4e48&#xff1f;<\/h4>\n<p>\u56de\u5230\u5f00\u5934\u7684\u98ce\u63a7\u573a\u666f&#xff0c;\u5982\u679c\u6539\u7528 Fluss PK \u8868&#xff1a;<\/p>\n<p><span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">TABLE<\/span> user_behavior <span class=\"token punctuation\">(<\/span><br \/>\n    user_id     <span class=\"token keyword\">BIGINT<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    event_type  STRING<span class=\"token punctuation\">,<\/span><br \/>\n    amount      <span class=\"token keyword\">DECIMAL<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">18<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    device_id   STRING<span class=\"token punctuation\">,<\/span><br \/>\n    event_time  <span class=\"token keyword\">TIMESTAMP<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token comment\">&#8212; &#8230; \u8fd8\u6709 195 \u4e2a\u5b57\u6bb5<\/span><br \/>\n    <span class=\"token keyword\">PRIMARY<\/span> <span class=\"token keyword\">KEY<\/span> <span class=\"token punctuation\">(<\/span>user_id<span class=\"token punctuation\">,<\/span> event_time<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">NOT<\/span> ENFORCED<br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">WITH<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#039;bucket.num&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;64&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#039;table.merge-engine&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;deduplicate&#039;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u9700\u6c42 1&#xff08;\u53ea\u8bfb 5 \u5217&#xff09;&#xff1a;\u9760 LogStore \u7684 Arrow \u5217\u5f0f\u683c\u5f0f &#043; \u5217\u88c1\u526a\u89e3\u51b3&#xff08;\u7b2c 3 \u7bc7\u8be6\u8ff0&#xff09;\u3002<\/p>\n<p>\u9700\u6c42 2&#xff08;\u67e5\u7d2f\u8ba1\u4ea4\u6613\u989d&#xff09;&#xff1a;\u9760 KvStore \u7684\u70b9\u67e5\u89e3\u51b3&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; \u76f4\u63a5\u70b9\u67e5&#xff0c;\u4e0d\u7528\u518d\u5f80 Redis \u5199\u4e00\u4efd<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> balance <span class=\"token keyword\">FROM<\/span> user_profile <span class=\"token keyword\">WHERE<\/span> user_id <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10086<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>\u4e09\u3001\u56fe 2&#xff1a;Merge Engine \u7c7b\u56fe<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260829162443-6a9307cbb317a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u6709\u4e86 KvStore&#xff0c;\u5c31\u5e26\u6765\u4e00\u4e2a\u65b0\u95ee\u9898&#xff1a;\u540c\u4e00\u4e2a key \u88ab\u5199\u5165\u591a\u6b21\u65f6&#xff0c;\u5e94\u8be5\u4fdd\u7559\u54ea\u4e2a\u503c&#xff1f;<\/p>\n<p>\u8fd9\u5c31\u662f Merge Engine \u8981\u56de\u7b54\u7684\u3002\u56fe\u4e2d RowMerger \u63a5\u53e3\u6709\u4e09\u4e2a\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">RowMerger<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">RowData<\/span> <span class=\"token function\">merge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">RowData<\/span> oldRow<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">RowData<\/span> newRow<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3.1 Deduplicate&#xff08;\u9ed8\u8ba4&#xff09;&#xff1a;\u65b0\u503c\u8986\u76d6\u65e7\u503c<\/h4>\n<p><span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">TABLE<\/span> user_profile <span class=\"token punctuation\">(<\/span><br \/>\n    user_id    <span class=\"token keyword\">BIGINT<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    name       STRING<span class=\"token punctuation\">,<\/span><br \/>\n    age        <span class=\"token keyword\">INT<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    city       STRING<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">PRIMARY<\/span> <span class=\"token keyword\">KEY<\/span> <span class=\"token punctuation\">(<\/span>user_id<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">NOT<\/span> ENFORCED<br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">WITH<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#039;bucket.num&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;16&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#039;table.merge-engine&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;deduplicate&#039;<\/span>    <span class=\"token comment\">&#8212; \u9ed8\u8ba4\u503c&#xff0c;\u53ef\u7701\u7565<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u884c\u4e3a&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DeduplicateRowMerger<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">RowMerger<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">RowData<\/span> <span class=\"token function\">merge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">RowData<\/span> oldRow<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">RowData<\/span> newRow<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> newRow<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u5c31\u8fd9\u4e48\u7b80\u5355<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<table>\n<tr>\u64cd\u4f5c\u7ed3\u679c<\/tr>\n<tbody>\n<tr>\n<td>INSERT (1, &#039;Alice&#039;, 28, &#039;Beijing&#039;)<\/td>\n<td>(1, &#039;Alice&#039;, 28, &#039;Beijing&#039;)<\/td>\n<\/tr>\n<tr>\n<td>INSERT (1, &#039;Alice&#039;, 29, &#039;Shanghai&#039;)<\/td>\n<td>(1, &#039;Alice&#039;, 29, &#039;Shanghai&#039;) \u5168\u884c\u8986\u76d6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u9002\u7528\u573a\u666f&#xff1a;\u7ef4\u8868\u3001CDC \u540c\u6b65\u7684\u76ee\u6807\u8868&#xff08;\u6e90\u7aef\u53d1\u6765\u7684\u662f\u5b8c\u6574\u7684\u884c\u955c\u50cf&#xff09;\u3002<\/p>\n<h4>3.2 PartialUpdate&#xff1a;NULL \u4e0d\u8986\u76d6<\/h4>\n<p>\u8fd9\u662f Fluss \u6700\u6709\u5b9e\u7528\u4ef7\u503c\u7684\u7279\u6027\u4e4b\u4e00\u3002<\/p>\n<p><span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">TABLE<\/span> user_tags <span class=\"token punctuation\">(<\/span><br \/>\n    user_id  <span class=\"token keyword\">BIGINT<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    tag1     STRING<span class=\"token punctuation\">,<\/span><br \/>\n    tag2     STRING<span class=\"token punctuation\">,<\/span><br \/>\n    tag3     STRING<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">PRIMARY<\/span> <span class=\"token keyword\">KEY<\/span> <span class=\"token punctuation\">(<\/span>user_id<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">NOT<\/span> ENFORCED<br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">WITH<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;table.merge-engine&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;partial-update&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u4e09\u4e2a\u4e0d\u540c\u7684\u4e1a\u52a1\u7cfb\u7edf\u5404\u81ea\u5199\u5165\u81ea\u5df1\u8d1f\u8d23\u7684\u5217<\/span><br \/>\n<span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> user_tags <span class=\"token keyword\">VALUES<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;vip&#039;<\/span><span class=\"token punctuation\">,<\/span>   <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span>   <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">&#8212; \u4f1a\u5458\u7cfb\u7edf<\/span><br \/>\n<span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> user_tags <span class=\"token keyword\">VALUES<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span>    <span class=\"token string\">&#039;tech&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">&#8212; \u5185\u5bb9\u7cfb\u7edf<\/span><br \/>\n<span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> user_tags <span class=\"token keyword\">VALUES<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span>    <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span>   <span class=\"token string\">&#039;gamer&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">&#8212; \u6e38\u620f\u7cfb\u7edf<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u6700\u7ec8\u7ed3\u679c&#xff1a;(1, &#039;vip&#039;, &#039;tech&#039;, &#039;gamer&#039;)<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PartialUpdateRowMerger<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">RowMerger<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">RowData<\/span> <span class=\"token function\">merge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">RowData<\/span> oldRow<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">RowData<\/span> newRow<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u9010\u5217&#xff1a;newRow \u8be5\u5217\u4e3a NULL \u5219\u4fdd\u7559 oldRow \u7684\u503c&#xff0c;\u5426\u5219\u7528\u65b0\u503c<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u4e2a\u7279\u6027\u89e3\u51b3\u4e86\u4e00\u4e2a\u7ecf\u5178\u7684\u5de5\u7a0b\u96be\u9898&#xff1a;\u5bbd\u8868\u7684\u591a\u6e90\u62fc\u63a5\u3002<\/p>\n<p>\u4f20\u7edf\u505a\u6cd5\u8981\u7528 Flink \u505a\u591a\u6d41 Join&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; \u4f20\u7edf\u65b9\u6848&#xff1a;\u4e09\u6d41 Join&#xff0c;\u72b6\u6001\u5de8\u5927<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> a<span class=\"token punctuation\">.<\/span>user_id<span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">.<\/span>tag1<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">.<\/span>tag2<span class=\"token punctuation\">,<\/span> c<span class=\"token punctuation\">.<\/span>tag3<br \/>\n<span class=\"token keyword\">FROM<\/span> member_stream a<br \/>\n<span class=\"token keyword\">LEFT<\/span> <span class=\"token keyword\">JOIN<\/span> content_stream b <span class=\"token keyword\">ON<\/span> a<span class=\"token punctuation\">.<\/span>user_id <span class=\"token operator\">&#061;<\/span> b<span class=\"token punctuation\">.<\/span>user_id<br \/>\n<span class=\"token keyword\">LEFT<\/span> <span class=\"token keyword\">JOIN<\/span> game_stream    c <span class=\"token keyword\">ON<\/span> a<span class=\"token punctuation\">.<\/span>user_id <span class=\"token operator\">&#061;<\/span> c<span class=\"token punctuation\">.<\/span>user_id<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u4e2a Join \u7684\u72b6\u6001\u91cf\u662f\u4e09\u4e2a\u6d41\u7684\u72b6\u6001\u4e4b\u548c&#xff0c;\u800c\u4e14\u4efb\u4f55\u4e00\u6761\u6d41\u8fdf\u5230\u90fd\u4f1a\u89e6\u53d1\u56de\u64a4\u3002<\/p>\n<p>\u7528 Partial Update \u4e4b\u540e&#xff0c;\u4e09\u4e2a\u7cfb\u7edf\u5404\u81ea\u72ec\u7acb\u5199\u5165\u540c\u4e00\u5f20\u8868\u7684\u4e0d\u540c\u5217&#xff0c;\u5b8c\u5168\u4e0d\u9700\u8981 Join&#xff1a;<\/p>\n<p>\u4f1a\u5458\u7cfb\u7edf \u2192 INSERT (user_id, tag1, NULL, NULL) \u2500\u2510<br \/>\n\u5185\u5bb9\u7cfb\u7edf \u2192 INSERT (user_id, NULL, tag2, NULL) \u2500\u253c\u2192 Fluss \u81ea\u52a8\u5408\u5e76<br \/>\n\u6e38\u620f\u7cfb\u7edf \u2192 INSERT (user_id, NULL, NULL, tag3) \u2500\u2518<\/p>\n<p>\u6ce8\u610f\u4e8b\u9879&#xff1a;<\/p>\n<li>\u5982\u679c\u4e1a\u52a1\u4e0a\u786e\u5b9e\u9700\u8981&#034;\u628a\u67d0\u5217\u66f4\u65b0\u6210 NULL&#034;&#xff0c;Partial Update \u505a\u4e0d\u5230\u2014\u2014\u4f60\u9700\u8981\u663e\u5f0f\u5199\u5165\u4e00\u4e2a\u54e8\u5175\u503c&#xff08;\u5982\u7a7a\u5b57\u7b26\u4e32\u3001-1&#xff09;\u3002<\/li>\n<li>\u591a\u4e2a\u6e90\u540c\u65f6\u5199\u540c\u4e00\u5217\u65f6&#xff0c;\u6700\u540e\u4e00\u6b21\u5199\u5165\u751f\u6548&#xff08;\u987a\u5e8f\u7531 LogTablet \u7684 offset \u51b3\u5b9a&#xff09;\u3002<\/li>\n<h4>3.3 Aggregation&#xff1a;\u628a\u805a\u5408\u4e0b\u63a8\u5230\u5b58\u50a8\u5c42<\/h4>\n<p><span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">TABLE<\/span> user_stats <span class=\"token punctuation\">(<\/span><br \/>\n    user_id     <span class=\"token keyword\">BIGINT<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    total_spent <span class=\"token keyword\">DECIMAL<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">18<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    order_count <span class=\"token keyword\">INT<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    last_login  <span class=\"token keyword\">TIMESTAMP<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">PRIMARY<\/span> <span class=\"token keyword\">KEY<\/span> <span class=\"token punctuation\">(<\/span>user_id<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">NOT<\/span> ENFORCED<br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">WITH<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#039;table.merge-engine&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;aggregation&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#039;fields.total_spent.aggregate-function&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;sum&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#039;fields.order_count.aggregate-function&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;sum&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#039;fields.last_login.aggregate-function&#039;<\/span>  <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;last_value&#039;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5199\u5165\u6548\u679c&#xff1a;<\/p>\n<p><span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> user_stats <span class=\"token keyword\">VALUES<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">100.00<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">TIMESTAMP<\/span> <span class=\"token string\">&#039;2026-08-01 10:00:00&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> user_stats <span class=\"token keyword\">VALUES<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">50.00<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">TIMESTAMP<\/span> <span class=\"token string\">&#039;2026-08-01 11:30:00&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> user_stats <span class=\"token keyword\">VALUES<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">200.00<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">TIMESTAMP<\/span> <span class=\"token string\">&#039;2026-08-01 12:00:00&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u8868\u4e2d\u6700\u7ec8\u53ea\u6709\u4e00\u884c&#xff1a;(1, 350.00, 3, 2026-08-01 12:00:00)<\/span><\/p>\n<p>\u56fe\u4e2d AggregationRowMerger \u6301\u6709 Map&lt;String, AggregateFunction&gt;&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">AggregationRowMerger<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">RowMerger<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">AggregateFunction<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> functions<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6bcf\u5217\u53ef\u914d\u7f6e<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">RowData<\/span> <span class=\"token function\">merge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">RowData<\/span> oldRow<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">RowData<\/span> newRow<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u904d\u5386\u6bcf\u4e00\u5217&#xff1a;<\/span><br \/>\n        <span class=\"token comment\">\/\/   \u914d\u7f6e\u4e86\u805a\u5408\u51fd\u6570 \u2192 \u6267\u884c functions.get(col).aggregate(oldVal, newVal)<\/span><br \/>\n        <span class=\"token comment\">\/\/   \u672a\u914d\u7f6e       \u2192 \u65b0\u503c\u8986\u76d6&#xff08;\u9000\u5316\u6210 Deduplicate&#xff09;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4e94\u79cd AggregateFunction \u5b9e\u73b0&#xff1a;<\/p>\n<table>\n<tr>\u51fd\u6570\u8bed\u4e49\u5178\u578b\u7528\u9014<\/tr>\n<tbody>\n<tr>\n<td>SumAggregate<\/td>\n<td>\u7d2f\u52a0<\/td>\n<td>\u7d2f\u8ba1\u91d1\u989d\u3001\u7d2f\u8ba1\u6b21\u6570<\/td>\n<\/tr>\n<tr>\n<td>MaxAggregate<\/td>\n<td>\u53d6\u6700\u5927<\/td>\n<td>\u6700\u9ad8\u5355\u4ef7\u3001\u6700\u8fd1\u66f4\u65b0\u65f6\u95f4<\/td>\n<\/tr>\n<tr>\n<td>MinAggregate<\/td>\n<td>\u53d6\u6700\u5c0f<\/td>\n<td>\u6700\u4f4e\u4ef7<\/td>\n<\/tr>\n<tr>\n<td>CountAggregate<\/td>\n<td>\u8ba1\u6570<\/td>\n<td>\u884c\u4e3a\u6b21\u6570<\/td>\n<\/tr>\n<tr>\n<td>LastValueAggregate<\/td>\n<td>\u53d6\u6700\u65b0\u503c<\/td>\n<td>\u6700\u540e\u767b\u5f55\u65f6\u95f4\u3001\u6700\u540e\u72b6\u6001<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8fd9\u4e2a\u7279\u6027\u7684\u4ef7\u503c&#xff1a;\u628a\u805a\u5408\u72b6\u6001\u4ece Flink \u4e0b\u63a8\u5230\u5b58\u50a8\u5c42\u3002<\/p>\n<p>\u4f20\u7edf\u505a\u6cd5&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; Flink \u91cc\u505a\u805a\u5408&#xff0c;\u72b6\u6001\u5b58 RocksDB StateBackend<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> user_id<span class=\"token punctuation\">,<\/span> <span class=\"token function\">SUM<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">COUNT<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">FROM<\/span> orders <span class=\"token keyword\">GROUP<\/span> <span class=\"token keyword\">BY<\/span> user_id<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">&#8212; \u95ee\u9898&#xff1a;\u72b6\u6001\u968f user_id \u6570\u91cf\u7ebf\u6027\u589e\u957f&#xff0c;\u4ebf\u7ea7\u7528\u6237 &#061; TB \u7ea7\u72b6\u6001<\/span><br \/>\n<span class=\"token comment\">&#8212;      Checkpoint \u6162&#xff0c;\u6062\u590d\u6162<\/span><\/p>\n<p>\u7528 Aggregation Merge Engine&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; Flink \u53ea\u9700\u8981\u505a\u7b80\u5355\u7684\u8f6c\u53d1<\/span><br \/>\n<span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> user_stats <span class=\"token keyword\">SELECT<\/span> user_id<span class=\"token punctuation\">,<\/span> amount<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> event_time <span class=\"token keyword\">FROM<\/span> orders<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">&#8212; \u805a\u5408\u5728 Fluss \u670d\u52a1\u7aef\u5b8c\u6210&#xff0c;Flink \u4f5c\u4e1a\u65e0\u72b6\u6001<\/span><\/p>\n<p>\u8fd9\u6837\u4e00\u6765&#xff0c;Flink \u4f5c\u4e1a\u53d8\u6210\u4e86\u65e0\u72b6\u6001\u7684\u7eaf\u8f6c\u53d1&#xff0c;Checkpoint \u79d2\u7ea7\u5b8c\u6210&#xff0c;\u6269\u7f29\u5bb9\u79d2\u7ea7\u751f\u6548\u3002\u8fd9\u5c31\u662f Fluss \u5ba3\u4f20\u7684&#034;\u72b6\u6001\u5916\u90e8\u5316&#034;\u7684\u4e00\u90e8\u5206\u3002<\/p>\n<h4>3.4 Merge Engine \u9009\u578b\u51b3\u7b56\u6811<\/h4>\n<p>\u9700\u8981\u6309\u4e3b\u952e\u67e5\u8be2\/\u66f4\u65b0\u5417&#xff1f;<br \/>\n\u2502<br \/>\n\u251c\u2500 \u5426 \u2192 Log \u8868&#xff08;\u65e0\u9700 Merge Engine&#xff0c;\u53ea\u6709 LogStore&#xff09;<br \/>\n\u2502<br \/>\n\u2514\u2500 \u662f \u2192 PK \u8868&#xff0c;\u9009\u54ea\u4e2a Merge Engine&#xff1f;<br \/>\n        \u2502<br \/>\n        \u251c\u2500 \u6bcf\u6b21\u5199\u5165\u90fd\u662f\u5b8c\u6574\u884c\u955c\u50cf&#xff08;\u5982 CDC&#xff09;<br \/>\n        \u2502   \u2514\u2500 deduplicate&#xff08;\u9ed8\u8ba4&#xff09;<br \/>\n        \u2502<br \/>\n        \u251c\u2500 \u591a\u4e2a\u6570\u636e\u6e90\u5404\u81ea\u5199\u4e0d\u540c\u7684\u5217<br \/>\n        \u2502   \u2514\u2500 partial-update<br \/>\n        \u2502<br \/>\n        \u2514\u2500 \u9700\u8981\u7d2f\u52a0\/\u53d6\u6700\u5927\u6700\u5c0f\/\u8ba1\u6570<br \/>\n            \u2514\u2500 aggregation<\/p>\n<h4>3.5 \u4e09\u79cd\u5f15\u64ce\u7684\u4ee3\u4ef7\u5bf9\u6bd4<\/h4>\n<table>\n<tr>\u5199\u653e\u5927\u8bfb\u6027\u80fd\u5b58\u50a8\u5f00\u9500\u9002\u7528\u5199\u6a21\u5f0f<\/tr>\n<tbody>\n<tr>\n<td>deduplicate<\/td>\n<td>1x<\/td>\n<td>\u6700\u4f18<\/td>\n<td>1x<\/td>\n<td>\u5168\u884c\u8986\u76d6<\/td>\n<\/tr>\n<tr>\n<td>partial-update<\/td>\n<td>1x&#xff08;\u9700\u5148\u8bfb\u65e7\u503c&#xff09;<\/td>\n<td>\u4f18<\/td>\n<td>1x<\/td>\n<td>\u591a\u6e90\u5217\u66f4\u65b0<\/td>\n<\/tr>\n<tr>\n<td>aggregation<\/td>\n<td>1x&#xff08;\u9700\u5148\u8bfb\u65e7\u503c&#xff09;<\/td>\n<td>\u4f18<\/td>\n<td>1x<\/td>\n<td>\u53ea\u589e\u4e0d\u51cf\u7684\u7d2f\u52a0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6ce8\u610f&#xff1a;partial-update \u548c aggregation \u5728\u5408\u5e76\u65f6\u9700\u8981\u5148\u8bfb\u51fa\u65e7\u503c&#xff0c;\u6240\u4ee5\u5b83\u4eec\u7684\u5199\u5165\u8def\u5f84\u6bd4 deduplicate \u591a\u4e00\u6b21 RocksDB \u8bfb\u3002\u5982\u679c\u65e7\u503c\u5728 block cache \u91cc&#xff0c;\u8fd9\u6b21\u8bfb\u662f\u5fae\u79d2\u7ea7&#xff1b;\u5982\u679c\u4e0d\u5728&#xff0c;\u4f1a\u6709\u4e00\u6b21\u78c1\u76d8 IO\u3002\u8c03\u4f18\u65b9\u5411\u5c31\u662f\u628a BLOCK_CACHE_SIZE \u8c03\u5927&#xff0c;\u8ba9\u70ed key \u5e38\u9a7b\u5185\u5b58\u3002<\/p>\n<hr \/>\n<h3>\u56db\u3001\u52a8\u624b\u9a8c\u8bc1<\/h3>\n<h4>4.1 \u89c2\u5bdf LogSegment \u7684\u6eda\u52a8<\/h4>\n<p><span class=\"token comment\"># \u521b\u5efa\u4e00\u4e2a\u6bb5\u5927\u5c0f\u5f88\u5c0f\u7684\u8868&#xff08;\u751f\u4ea7\u4e0d\u8981\u8fd9\u4e48\u5e72&#xff0c;\u8fd9\u91cc\u662f\u4e3a\u4e86\u89c2\u5bdf&#xff09;<\/span><br \/>\nCREATE TABLE seg_test <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token function\">id<\/span> BIGINT, payload STRING<br \/>\n<span class=\"token punctuation\">)<\/span> WITH <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;bucket.num&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;1&#039;<\/span>, <span class=\"token string\">&#039;log.segment.size&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;1MB&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>&#8212; \u6301\u7eed\u5199\u5165&#xff0c;\u89c2\u5bdf\u6587\u4ef6\u6eda\u52a8<br \/>\n<span class=\"token function\">watch<\/span> <span class=\"token parameter variable\">-n<\/span> <span class=\"token number\">1<\/span> <span class=\"token string\">&#039;ls -la \/data\/fluss-server\/data\/log\/fluss\/seg_test\/bucket-0\/&#039;<\/span><\/p>\n<p>\u4f60\u4f1a\u770b\u5230 00000000000000000000.log \u5199\u6ee1 1MB \u540e&#xff0c;\u51fa\u73b0 00000000000000012345.log&#xff0c;\u6587\u4ef6\u540d\u5c31\u662f\u65b0\u6bb5\u7684\u8d77\u59cb offset\u3002<\/p>\n<h4>4.2 \u9a8c\u8bc1 Partial Update \u7684\u5408\u5e76\u884c\u4e3a<\/h4>\n<p><span class=\"token comment\">&#8212; Flink SQL \u5ba2\u6237\u7aef<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">TABLE<\/span> user_tags <span class=\"token punctuation\">(<\/span><br \/>\n    user_id <span class=\"token keyword\">BIGINT<\/span><span class=\"token punctuation\">,<\/span> tag1 STRING<span class=\"token punctuation\">,<\/span> tag2 STRING<span class=\"token punctuation\">,<\/span> tag3 STRING<span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">PRIMARY<\/span> <span class=\"token keyword\">KEY<\/span> <span class=\"token punctuation\">(<\/span>user_id<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">NOT<\/span> ENFORCED<br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">WITH<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;table.merge-engine&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;partial-update&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> user_tags <span class=\"token keyword\">VALUES<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;vip&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> user_tags <span class=\"token keyword\">VALUES<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;tech&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> user_tags <span class=\"token keyword\">VALUES<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;gamer&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">SELECT<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">FROM<\/span> user_tags <span class=\"token keyword\">WHERE<\/span> user_id <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">&#8212; \u9884\u671f&#xff1a;1, vip, tech, gamer<\/span><\/p>\n<h4>4.3 \u9a8c\u8bc1 Aggregation \u7684\u7d2f\u52a0<\/h4>\n<p><span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">TABLE<\/span> user_stats <span class=\"token punctuation\">(<\/span><br \/>\n    user_id <span class=\"token keyword\">BIGINT<\/span><span class=\"token punctuation\">,<\/span> total_spent <span class=\"token keyword\">DECIMAL<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">18<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> order_count <span class=\"token keyword\">INT<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">PRIMARY<\/span> <span class=\"token keyword\">KEY<\/span> <span class=\"token punctuation\">(<\/span>user_id<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">NOT<\/span> ENFORCED<br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">WITH<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#039;table.merge-engine&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;aggregation&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#039;fields.total_spent.aggregate-function&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;sum&#039;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token string\">&#039;fields.order_count.aggregate-function&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;sum&#039;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> user_stats <span class=\"token keyword\">VALUES<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">100.00<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> user_stats <span class=\"token keyword\">VALUES<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token number\">50.00<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> user_stats <span class=\"token keyword\">VALUES<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">200.00<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">SELECT<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">FROM<\/span> user_stats <span class=\"token keyword\">WHERE<\/span> user_id <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">&#8212; \u9884\u671f&#xff1a;1, 350.00, 3<\/span><\/p>\n<hr \/>\n<h3>\u4e94\u3001\u751f\u4ea7\u5b9e\u8df5\u8981\u70b9<\/h3>\n<h4>5.1 Bucket \u6570\u91cf\u600e\u4e48\u5b9a<\/h4>\n<p>bucket.num \u662f PK \u8868\u6700\u91cd\u8981\u7684\u53c2\u6570&#xff0c;\u56e0\u4e3a\u5b83\u51b3\u5b9a\u4e86\u5e76\u53d1\u5ea6\u548c\u6570\u636e\u5206\u5e03\u7684\u5747\u5300\u6027&#xff0c;\u4e14\u540e\u671f\u8c03\u6574\u4ee3\u4ef7\u5927\u3002<\/p>\n<p><span class=\"token comment\">&#8212; \u4f30\u7b97\u516c\u5f0f<\/span><br \/>\nbucket<span class=\"token punctuation\">.<\/span>num \u2248 <span class=\"token function\">max<\/span><span class=\"token punctuation\">(<\/span>\u9884\u671f\u5cf0\u503c\u5199\u5165 QPS <span class=\"token operator\">\/<\/span> \u5355 bucket \u541e\u5410<span class=\"token punctuation\">,<\/span> TabletServer \u6570 \u00d7 <span class=\"token number\">2<\/span><span class=\"token operator\">~<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u7ecf\u9a8c\u503c&#xff1a;<\/p>\n<table>\n<tr>\u573a\u666fbucket.num \u5efa\u8bae<\/tr>\n<tbody>\n<tr>\n<td>\u5c0f\u7ef4\u8868&#xff08;\u767e\u4e07\u884c\u4ee5\u5185&#xff09;<\/td>\n<td>4 &#8211; 16<\/td>\n<\/tr>\n<tr>\n<td>\u4e2d\u578b\u8868&#xff08;\u5343\u4e07\u884c&#xff09;<\/td>\n<td>32 &#8211; 64<\/td>\n<\/tr>\n<tr>\n<td>\u5927\u8868&#xff08;\u4ebf\u7ea7\u4ee5\u4e0a&#xff09;<\/td>\n<td>128 &#8211; 512<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6ce8\u610f&#xff1a;bucket.num \u53ea\u80fd\u5728\u5efa\u8868\u65f6\u6307\u5b9a\u3002\u8981\u4fee\u6539\u53ea\u80fd\u91cd\u5efa\u8868\u8fc1\u79fb\u6570\u636e\u3002\u6240\u4ee5\u5b81\u53ef\u4e00\u5f00\u59cb\u5c31\u7ed9\u5927\u4e00\u70b9\u3002<\/p>\n<h4>5.2 RocksDB \u8c03\u4f18<\/h4>\n<p>\u9ed8\u8ba4\u53c2\u6570\u5bf9\u4e2d\u5c0f\u89c4\u6a21\u591f\u7528&#xff0c;\u4f46\u5982\u679c\u70b9\u67e5 QPS \u5f88\u9ad8&#xff08;&gt; 10\u4e07\/s&#xff09;&#xff0c;\u9700\u8981\u8c03&#xff1a;<\/p>\n<p># tablet-server.yaml<br \/>\n# \u589e\u5927 block cache&#xff08;\u4f46\u8981\u7ed9 Flink TM \u7559\u5185\u5b58&#xff09;<br \/>\nrocksdb.block.cache.size: 1GB<br \/>\n# \u589e\u5927 MemTable&#xff0c;\u51cf\u5c11 flush&#xff08;\u5199\u591a\u8bfb\u5c11\u573a\u666f&#xff09;<br \/>\nrocksdb.write.buffer.size: 128MB<br \/>\n# \u9650\u5236 L0 \u6587\u4ef6\u6570&#xff0c;\u907f\u514d\u8bfb\u653e\u5927<br \/>\nrocksdb.level0.slowdown-writes-trigger: 20<br \/>\nrocksdb.level0.stop-writes-trigger: 36<\/p>\n<h4>5.3 \u78c1\u76d8\u9009\u578b<\/h4>\n<p>\u63a8\u8350&#xff1a;NVMe SSD<br \/>\n\u907f\u514d&#xff1a;\u7f51\u7edc\u76d8&#xff08;\u4e91\u76d8&#xff09;\u3001HDD<\/p>\n<p>\u539f\u56e0&#xff1a;RocksDB \u7684 compaction \u662f\u968f\u673a IO \u5bc6\u96c6\u578b&#xff0c;\u7f51\u7edc\u76d8\u7684 IOPS \u548c\u5ef6\u8fdf\u90fd\u4e0d\u8fbe\u6807\u3002\u5982\u679c\u53ea\u80fd\u7528\u4e91\u76d8&#xff0c;\u9009\u62e9 ESSD PL1 \u4ee5\u4e0a\u89c4\u683c\u3002<\/p>\n<h4>5.4 \u5bb9\u91cf\u89c4\u5212<\/h4>\n<p>PK \u8868\u5355\u526f\u672c\u5360\u7528 \u2248 LogStore \u6570\u636e &#043; KvStore \u6570\u636e<br \/>\n                \u2248 \u539f\u59cb\u6570\u636e\u91cf \u00d7 (1 &#043; 1.5)      # RocksDB \u6709\u7a7a\u95f4\u653e\u5927<br \/>\n                \u2248 \u539f\u59cb\u6570\u636e\u91cf \u00d7 2.5<\/p>\n<p>\u518d\u4e58\u4ee5\u526f\u672c\u6570&#xff08;\u9ed8\u8ba4 3&#xff09;&#xff1a;\u603b\u5360\u7528 \u2248 \u539f\u59cb\u6570\u636e\u91cf \u00d7 7.5<\/p>\n<p>\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48 Log \u8868\u6bd4 PK \u8868&#034;\u4fbf\u5b9c&#034;\u5f88\u591a\u2014\u2014Log \u8868\u53ea\u6709 1x \u6570\u636e \u00d7 3 \u526f\u672c &#061; 3x\u3002<\/p>\n<hr \/>\n<h3>\u516d\u3001\u6392\u969c\u624b\u518c<\/h3>\n<table>\n<tr>\u73b0\u8c61\u53ef\u80fd\u539f\u56e0\u6392\u67e5\u65b9\u5411<\/tr>\n<tbody>\n<tr>\n<td>\u70b9\u67e5 P99 \u7a81\u7136\u4ece 1ms \u6da8\u5230 50ms<\/td>\n<td>block cache \u547d\u4e2d\u7387\u4e0b\u964d<\/td>\n<td>\u76d1\u63a7 RocksDB block-cache-hit-rate&#xff1b;\u68c0\u67e5\u662f\u5426\u6709\u5927\u6279\u91cf\u626b\u63cf\u6253\u4e71\u4e86\u7f13\u5b58<\/td>\n<\/tr>\n<tr>\n<td>\u5199\u5165\u541e\u5410\u4e0a\u4e0d\u53bb<\/td>\n<td>L0 \u6587\u4ef6\u5806\u79ef\u89e6\u53d1 write stall<\/td>\n<td>\u770b\u65e5\u5fd7\u6709\u6ca1\u6709 \u201cStopping writes\u201d&#xff1b;\u8c03\u5927 write buffer \u6216\u52a0\u5feb compaction<\/td>\n<\/tr>\n<tr>\n<td>Partial Update \u7ed3\u679c\u4e0d\u7b26\u5408\u9884\u671f<\/td>\n<td>\u4e24\u4e2a\u6e90\u5199\u4e86\u540c\u4e00\u5217<\/td>\n<td>\u68c0\u67e5\u5404\u5199\u5165\u4efb\u52a1\u7684\u5217\u6620\u5c04&#xff1b;\u786e\u8ba4\u6ca1\u6709\u628a\u9700\u8981\u4fdd\u7559\u7684\u5217\u5199\u6210 NULL<\/td>\n<\/tr>\n<tr>\n<td>Aggregation \u6570\u503c\u504f\u5c0f<\/td>\n<td>\u90e8\u5206\u5199\u5165\u5931\u8d25\u88ab\u9759\u9ed8\u4e22\u5f03<\/td>\n<td>\u68c0\u67e5 Flink \u4f5c\u4e1a\u662f\u5426\u6709\u53cd\u538b\u5bfc\u81f4\u7684\u8d85\u65f6\u91cd\u8bd5<\/td>\n<\/tr>\n<tr>\n<td>\u78c1\u76d8\u7a7a\u95f4\u6301\u7eed\u589e\u957f\u4e0d\u91ca\u653e<\/td>\n<td>LogSegment \u672a\u8fc7\u671f<\/td>\n<td>\u68c0\u67e5 log.retention \u914d\u7f6e&#xff1b;\u786e\u8ba4 PK \u8868\u7684 KvTablet \u6709\u5728\u505a snapshot<\/td>\n<\/tr>\n<tr>\n<td>\u91cd\u542f\u540e\u6062\u590d\u7279\u522b\u6162<\/td>\n<td>WAL \u56de\u653e\u91cf\u5927<\/td>\n<td>\u589e\u5927 KvTablet \u7684 snapshot \u9891\u7387&#xff0c;\u51cf\u5c0f\u9700\u8981\u56de\u653e\u7684 offset \u533a\u95f4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>\u4e03\u3001\u5c0f\u7ed3<\/h3>\n<li>LogStore \u4e0e Kafka \u540c\u6784&#xff1a;LogSegment &#061; .log &#043; .index &#043; .timeindex&#xff0c;\u7a00\u758f\u7d22\u5f15 &#043; mmap &#043; \u4e8c\u5206\u67e5\u627e&#xff0c;\u8fd9\u662f\u65e5\u5fd7\u5b58\u50a8\u7684\u6700\u4f18\u89e3\u3002<\/li>\n<li>KvStore \u7528 LogTablet \u505a\u5171\u4eab WAL&#xff1a;\u5199\u5165\u987a\u5e8f\u5fc5\u987b\u662f&#034;\u5148 WAL \u540e RocksDB&#034;&#xff0c;\u539f\u56e0\u662f RocksDB \u672c\u5730 WAL \u4e0d\u53c2\u4e0e\u526f\u672c\u590d\u5236\u3002<\/li>\n<li>Bloom Filter \u662f\u70b9\u67e5\u6027\u80fd\u7684\u5173\u952e&#xff1a;\u5b83\u628a&#034;\u67e5\u4e0d\u5b58\u5728\u7684 key&#034;\u7684\u4ee3\u4ef7\u4ece\u51e0\u5341\u6b21\u78c1\u76d8 IO \u964d\u5230\u96f6\u3002<\/li>\n<li>\u4e09\u79cd Merge Engine \u89e3\u51b3\u4e09\u7c7b\u95ee\u9898&#xff1a;deduplicate&#xff08;\u5168\u884c\u8986\u76d6&#xff09;\u3001partial-update&#xff08;\u591a\u6e90\u5217\u62fc\u63a5&#xff09;\u3001aggregation&#xff08;\u805a\u5408\u4e0b\u63a8&#xff09;\u3002<\/li>\n<li>partial-update \u7684\u5de5\u7a0b\u4ef7\u503c\u6700\u5927&#xff1a;\u5b83\u8ba9&#034;\u591a\u6d41 Join \u62fc\u5bbd\u8868&#034;\u53d8\u6210\u4e86&#034;\u591a\u6e90\u72ec\u7acb\u5199\u5165 &#043; \u5b58\u50a8\u5c42\u5408\u5e76&#034;&#xff0c;\u5f7b\u5e95\u6d88\u9664\u4e86 Join \u72b6\u6001\u3002<\/li>\n<p>\u4e0b\u4e00\u7bc7&#xff0c;\u6211\u4eec\u628a\u8fd9\u4e24\u5957\u5f15\u64ce\u4e32\u8d77\u6765&#xff0c;\u8ddf\u8e2a\u4e00\u6b21\u5199\u5165\u3001\u4e00\u6b21\u6d41\u5f0f\u8bfb\u53d6\u3001\u4e00\u6b21\u70b9\u67e5\u7684\u5b8c\u6574\u8c03\u7528\u94fe\u3002<\/p>\n<hr \/>\n","protected":false},"excerpt":{"rendered":"<p>\u56fe\u89e3 Fluss&#xff08;\u4e8c&#xff09;&#xff1a;\u5b58\u50a8\u5f15\u64ce\u53cc\u5f15\u64ce \u2014\u2014 LogStore \u4e0e KvStore\u9605\u8bfb\u672c\u6587\u4f60\u5c06\u4e86\u89e3&#xff1a; LogSegment \u7684\u7a00\u758f\u7d22\u5f15\u4e3a\u4ec0\u4e48\u548c Kafka \u957f\u5f97\u4e00\u6837\u3001PK \u8868\\&#8221;\u5148\u5199 WAL \u518d\u5199 RocksDB\\&#8221;\u7684\u987a\u5e8f\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u53cd\u3001RocksDB \u90a3\u51e0\u4e2a\u5173\u952e\u53c2\u6570\u7684\u542b\u4e49\u3001\u4ee5\u53ca\u4e09\u79cd Merge Engine \u8be5\u600e\u4e48\u9009\u3002<br \/>\n\u914d\u5957\u56fe\u8868&#xff1a;class-02-storage-engine\u3001class-04-merge-en<\/p>\n","protected":false},"author":2,"featured_media":97680,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[11192,55,3231],"topic":[],"class_list":["post-97682","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-fluss","tag-c","tag-linq"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u56fe\u89e3 Fluss\uff08\u4e8c\uff09\uff1a\u5b58\u50a8\u5f15\u64ce\u53cc\u5f15\u64ce \u2014\u2014 LogStore \u4e0e KvStore - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/97682.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u56fe\u89e3 Fluss\uff08\u4e8c\uff09\uff1a\u5b58\u50a8\u5f15\u64ce\u53cc\u5f15\u64ce \u2014\u2014 LogStore \u4e0e KvStore - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u56fe\u89e3 Fluss&#xff08;\u4e8c&#xff09;&#xff1a;\u5b58\u50a8\u5f15\u64ce\u53cc\u5f15\u64ce \u2014\u2014 LogStore \u4e0e KvStore\u9605\u8bfb\u672c\u6587\u4f60\u5c06\u4e86\u89e3&#xff1a; LogSegment \u7684\u7a00\u758f\u7d22\u5f15\u4e3a\u4ec0\u4e48\u548c Kafka \u957f\u5f97\u4e00\u6837\u3001PK \u8868&quot;\u5148\u5199 WAL \u518d\u5199 RocksDB&quot;\u7684\u987a\u5e8f\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u53cd\u3001RocksDB \u90a3\u51e0\u4e2a\u5173\u952e\u53c2\u6570\u7684\u542b\u4e49\u3001\u4ee5\u53ca\u4e09\u79cd Merge Engine \u8be5\u600e\u4e48\u9009\u3002 \u914d\u5957\u56fe\u8868&#xff1a;class-02-storage-engine\u3001class-04-merge-en\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/97682.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-29T16:24:45+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260829162442-6a9307cace8bf.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/97682.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/97682.html\",\"name\":\"\u56fe\u89e3 Fluss\uff08\u4e8c\uff09\uff1a\u5b58\u50a8\u5f15\u64ce\u53cc\u5f15\u64ce \u2014\u2014 LogStore \u4e0e KvStore - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2026-08-29T16:24:45+00:00\",\"dateModified\":\"2026-08-29T16:24:45+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/97682.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/97682.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/97682.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"\u56fe\u89e3 Fluss\uff08\u4e8c\uff09\uff1a\u5b58\u50a8\u5f15\u64ce\u53cc\u5f15\u64ce \u2014\u2014 LogStore \u4e0e KvStore\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"\u56fe\u89e3 Fluss\uff08\u4e8c\uff09\uff1a\u5b58\u50a8\u5f15\u64ce\u53cc\u5f15\u64ce \u2014\u2014 LogStore \u4e0e KvStore - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/97682.html","og_locale":"zh_CN","og_type":"article","og_title":"\u56fe\u89e3 Fluss\uff08\u4e8c\uff09\uff1a\u5b58\u50a8\u5f15\u64ce\u53cc\u5f15\u64ce \u2014\u2014 LogStore \u4e0e KvStore - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u56fe\u89e3 Fluss&#xff08;\u4e8c&#xff09;&#xff1a;\u5b58\u50a8\u5f15\u64ce\u53cc\u5f15\u64ce \u2014\u2014 LogStore \u4e0e KvStore\u9605\u8bfb\u672c\u6587\u4f60\u5c06\u4e86\u89e3&#xff1a; LogSegment \u7684\u7a00\u758f\u7d22\u5f15\u4e3a\u4ec0\u4e48\u548c Kafka \u957f\u5f97\u4e00\u6837\u3001PK \u8868\"\u5148\u5199 WAL \u518d\u5199 RocksDB\"\u7684\u987a\u5e8f\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u53cd\u3001RocksDB \u90a3\u51e0\u4e2a\u5173\u952e\u53c2\u6570\u7684\u542b\u4e49\u3001\u4ee5\u53ca\u4e09\u79cd Merge Engine \u8be5\u600e\u4e48\u9009\u3002 \u914d\u5957\u56fe\u8868&#xff1a;class-02-storage-engine\u3001class-04-merge-en","og_url":"https:\/\/www.wsisp.com\/helps\/97682.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-08-29T16:24:45+00:00","og_image":[{"url":"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260829162442-6a9307cace8bf.png"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"8 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/97682.html","url":"https:\/\/www.wsisp.com\/helps\/97682.html","name":"\u56fe\u89e3 Fluss\uff08\u4e8c\uff09\uff1a\u5b58\u50a8\u5f15\u64ce\u53cc\u5f15\u64ce \u2014\u2014 LogStore \u4e0e KvStore - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2026-08-29T16:24:45+00:00","dateModified":"2026-08-29T16:24:45+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/97682.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/97682.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/97682.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"\u56fe\u89e3 Fluss\uff08\u4e8c\uff09\uff1a\u5b58\u50a8\u5f15\u64ce\u53cc\u5f15\u64ce \u2014\u2014 LogStore \u4e0e KvStore"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/97682","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=97682"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/97682\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media\/97680"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=97682"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=97682"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=97682"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=97682"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}