{"id":46897,"date":"2023-01-31T20:47:42","date_gmt":"2023-03-20T22:40:46","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8%e4%bd%bf%e7%94%a8kafka-streams%e7%9a%84windowstatestore%e8%bf%9b%e8%a1%8c%e8%81%9a%e5%90%88%e5%a4%84%e7%90%86%e6%97%b6%ef%bc%8c%e5%a4%84%e7%90%86%e6%9c%aa%e6%9d%a5%e6%97%b6%e9%97%b4%e6%88%b3\/"},"modified":"2024-04-29T12:26:59","modified_gmt":"2024-04-29T04:26:59","slug":"%e5%9c%a8%e4%bd%bf%e7%94%a8kafka-streams%e7%9a%84windowstatestore%e8%bf%9b%e8%a1%8c%e8%81%9a%e5%90%88%e5%a4%84%e7%90%86%e6%97%b6%ef%bc%8c%e5%a4%84%e7%90%86%e6%9c%aa%e6%9d%a5%e6%97%b6%e9%97%b4%e6%88%b3","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8%e4%bd%bf%e7%94%a8kafka-streams%e7%9a%84windowstatestore%e8%bf%9b%e8%a1%8c%e8%81%9a%e5%90%88%e5%a4%84%e7%90%86%e6%97%b6%ef%bc%8c%e5%a4%84%e7%90%86%e6%9c%aa%e6%9d%a5%e6%97%b6%e9%97%b4%e6%88%b3\/","title":{"rendered":"\u5728\u4f7f\u7528Kafka Streams\u7684WindowStateStore\u8fdb\u884c\u805a\u5408\u5904\u7406\u65f6\uff0c\u5904\u7406\u672a\u6765\u65f6\u95f4\u6233\u53ef\u80fd\u5b58\u5728\u7684\u5371\u9669\u9677\u9631"},"content":{"rendered":"<p>Kafka Streams\u6709\u4e00\u4e2a\u540d\u4e3aWindow Aggregation\u7684\u673a\u5236\uff0c\u53ef\u4ee5\u5bf9\u4e8b\u4ef6\u8fdb\u884c\u8ba1\u6570\u7b49\u64cd\u4f5c\uff0c\u4ee5\u7279\u5b9a\u7684\u65f6\u95f4\u95f4\u9694\u4e3a\u5355\u4f4d\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u6211\u5199\u4e86\u4e00\u4e2a\u5229\u7528\u5b83\u6765\u8ba1\u7b97\u6bcf\u4e2a\u7528\u6237\u4e8b\u4ef6\u6267\u884c\u6b21\u6570\u7684\u5904\u7406\u65b9\u6cd5\uff0c\u4f46\u5947\u602a\u7684\u662f\u7ed3\u679c\u5374\u4e0d\u7b26\u5408\u9884\u671f\u3002<br \/>\n\u5728\u6d4b\u8bd5\u4ee3\u7801\u4e2d\u65e0\u6cd5\u590d\u5236\uff0c\u5e76\u4e14\u51fa\u73b0\u4e86\u6982\u7387\u6027\u7ed3\u679c\u504f\u5dee\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u6211\u975e\u5e38\u6c89\u8ff7\u4e8e\u5176\u4e2d\uff0c\u4f46\u95ee\u9898\u51fa\u5728\u5904\u7406\u672a\u6765\u65f6\u95f4\u6233\u7684\u539f\u56e0\u4e0a\u3002<\/p>\n<h2>\u9a8c\u8bc1\u7248\u672c<\/h2>\n<ul class=\"post-ul\">kafka-streams-2.4.0<\/ul>\n<h2>\u554f\u984c\u7684\u8a73\u7d30<\/h2>\n<p>\u5c3d\u7ba1\u6570\u636e\u5df2\u7ecf\u6210\u529f\u5199\u5165\u5e76\u4f20\u9012\u5230\u540e\u7aef\u7684Kafka\u4e3b\u9898\uff0c\u4f46\u5f53\u5c1d\u8bd5\u91cd\u65b0\u83b7\u53d6\u6570\u636e\u65f6\uff0c\u65e0\u6cd5\u83b7\u53d6\u5230\u73b0\u6709\u7684\u805a\u5408\u8ba1\u6570\u3002<br \/>\n\u56e0\u6b64\u8ba1\u6570\u88ab\u91cd\u7f6e\uff0c\u5e76\u4e14\u5176\u4ed6\u5730\u65b9\u4e5f\u65e0\u6cd5\u83b7\u53d6\u7ed3\u679c\u7684\u72b6\u6001\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u78ba\u5b9f\u306bput\u51e6\u7406\u306f\u884c\u308f\u308c\u3066\u3044\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u7d10\u4ed8\u3044\u3066\u3044\u308bKafka\u306e\u30c8\u30d4\u30c3\u30af\u306b\u306f\u78ba\u5b9f\u306b\u30c7\u30fc\u30bf\u304c\u5c4a\u3044\u3066\u3044\u308b<\/ul>\n<h2>\u539f\u56e0\uff1aRocksDB\u7684Segment\u56e0\u672a\u6765\u65f6\u95f4\u6233\u7684\u5f71\u54cd\u800c\u8fc7\u671f\u3002<\/h2>\n<p>Kafka Streams\u7684WindowStore\u4e2d\u5b58\u5728\u7740\u4fdd\u7559\u671f\u9650\u3002\u8d85\u8fc7\u4fdd\u7559\u671f\u9650\u7684\u6570\u636e\u5c06\u4f1a\u88ab\u5220\u9664\u3002<br \/>\n\u4ee5\u4ee5\u4e0b\u4f8b\u5b50\u4e3a\u51c6\uff0c\u4fdd\u6301\u671f\u9650\u4e3a30\u5929\u3002<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">private<\/span> <span class=\"nc\">StoreBuilder<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">WindowStore<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Counter<\/span><span class=\"o\">&gt;&gt;<\/span> <span class=\"n\">counterStore<\/span> <span class=\"o\">=<\/span>\r\n      <span class=\"nc\">Stores<\/span><span class=\"o\">.<\/span><span class=\"na\">windowStoreBuilder<\/span><span class=\"o\">(<\/span>\r\n              <span class=\"nc\">Stores<\/span><span class=\"o\">.<\/span><span class=\"na\">persistentWindowStore<\/span><span class=\"o\">(<\/span>\r\n                  <span class=\"s\">\"counter\"<\/span><span class=\"o\">,<\/span>\r\n                  <span class=\"nc\">Duration<\/span><span class=\"o\">.<\/span><span class=\"na\">ofDays<\/span><span class=\"o\">(<\/span><span class=\"mi\">30<\/span><span class=\"o\">),<\/span>\r\n                  <span class=\"nc\">Duration<\/span><span class=\"o\">.<\/span><span class=\"na\">ofHours<\/span><span class=\"o\">(<\/span><span class=\"mi\">24<\/span><span class=\"o\">),<\/span>\r\n                  <span class=\"kc\">false<\/span><span class=\"o\">),<\/span>\r\n              <span class=\"nc\">Serdes<\/span><span class=\"o\">.<\/span><span class=\"na\">String<\/span><span class=\"o\">(),<\/span>\r\n              <span class=\"nc\">Serdes<\/span><span class=\"o\">.<\/span><span class=\"na\">Integer<\/span><span class=\"o\">())<\/span>\r\n          <span class=\"o\">.<\/span><span class=\"na\">withCachingEnabled<\/span><span class=\"o\">();<\/span>\r\n<\/code><\/pre>\n<p>\u53e6\u5916\uff0cWindowStore\u5728\u5185\u90e8\u901a\u8fc7Segment\u8fd9\u4e2a\u5355\u4f4d\u5bf9\u6570\u636e\u76ee\u5f55\u8fdb\u884c\u5212\u5206\u3002<br \/>\nSegment\u7684\u95f4\u9694\u662f\u4fdd\u7559\u671f\u7684\u4e00\u534a\u65f6\u95f4\u95f4\u9694\u3002\uff08\u6700\u77ed\u4e3a1\u5206\u949f\uff09<\/p>\n<p>\u5927\u81f4\u4e0a\u8868\u73b0\u51fa\u4ee5\u4e0b\u7684\u52a8\u4f5c\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">timestamp\u3068\u5171\u306bput\u3092\u5b9f\u884c\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">timestamp\u3068segment interval\u304b\u3089segment id\u3092\u7b97\u51fa\u3059\u308b<\/ul>\n<pre class=\"post-pre\"><code>    <span class=\"nd\">@Override<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">segmentName<\/span><span class=\"o\">(<\/span><span class=\"kd\">final<\/span> <span class=\"kt\">long<\/span> <span class=\"n\">segmentId<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"c1\">\/\/ (1) previous format used - as a separator so if this changes in the future<\/span>\r\n        <span class=\"c1\">\/\/ then we should use something different.<\/span>\r\n        <span class=\"c1\">\/\/ (2) previous format used : as a separator (which did break KafkaStreams on Windows OS)<\/span>\r\n        <span class=\"c1\">\/\/ so if this changes in the future then we should use something different.<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">name<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\".\"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">segmentId<\/span> <span class=\"o\">*<\/span> <span class=\"n\">segmentInterval<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"nd\">@Override<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">long<\/span> <span class=\"nf\">segmentId<\/span><span class=\"o\">(<\/span><span class=\"kd\">final<\/span> <span class=\"kt\">long<\/span> <span class=\"n\">timestamp<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">timestamp<\/span> <span class=\"o\">\/<\/span> <span class=\"n\">segmentInterval<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u5bfe\u8c61\u306eSegment\u3092\u7279\u5b9a\u3057\u305d\u3053\u306b\u30c7\u30fc\u30bf\u3092put\u3059\u308b<\/ul>\n<pre class=\"post-pre\"><code>    <span class=\"nd\">@Override<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">put<\/span><span class=\"o\">(<\/span><span class=\"kd\">final<\/span> <span class=\"nc\">Bytes<\/span> <span class=\"n\">key<\/span><span class=\"o\">,<\/span>\r\n                    <span class=\"kd\">final<\/span> <span class=\"kt\">byte<\/span><span class=\"o\">[]<\/span> <span class=\"n\">value<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"kd\">final<\/span> <span class=\"kt\">long<\/span> <span class=\"n\">timestamp<\/span> <span class=\"o\">=<\/span> <span class=\"n\">keySchema<\/span><span class=\"o\">.<\/span><span class=\"na\">segmentTimestamp<\/span><span class=\"o\">(<\/span><span class=\"n\">key<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">observedStreamTime<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Math<\/span><span class=\"o\">.<\/span><span class=\"na\">max<\/span><span class=\"o\">(<\/span><span class=\"n\">observedStreamTime<\/span><span class=\"o\">,<\/span> <span class=\"n\">timestamp<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"kd\">final<\/span> <span class=\"kt\">long<\/span> <span class=\"n\">segmentId<\/span> <span class=\"o\">=<\/span> <span class=\"n\">segments<\/span><span class=\"o\">.<\/span><span class=\"na\">segmentId<\/span><span class=\"o\">(<\/span><span class=\"n\">timestamp<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"kd\">final<\/span> <span class=\"no\">S<\/span> <span class=\"n\">segment<\/span> <span class=\"o\">=<\/span> <span class=\"n\">segments<\/span><span class=\"o\">.<\/span><span class=\"na\">getOrCreateSegmentIfLive<\/span><span class=\"o\">(<\/span><span class=\"n\">segmentId<\/span><span class=\"o\">,<\/span> <span class=\"n\">context<\/span><span class=\"o\">,<\/span> <span class=\"n\">observedStreamTime<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">segment<\/span> <span class=\"o\">==<\/span> <span class=\"kc\">null<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"n\">expiredRecordSensor<\/span><span class=\"o\">.<\/span><span class=\"na\">record<\/span><span class=\"o\">();<\/span>\r\n            <span class=\"no\">LOG<\/span><span class=\"o\">.<\/span><span class=\"na\">debug<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Skipping record for expired segment.\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span> <span class=\"k\">else<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"n\">segment<\/span><span class=\"o\">.<\/span><span class=\"na\">put<\/span><span class=\"o\">(<\/span><span class=\"n\">key<\/span><span class=\"o\">,<\/span> <span class=\"n\">value<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u305d\u306e\u969b\u3001\u53d7\u3051\u53d6\u3063\u305f\u3053\u3068\u306e\u3042\u308b\u6700\u3082\u672a\u6765\u306etimestamp\u3092observedStreamTime\u3068\u3057\u3066\u5229\u7528\u3057\u3001\u305d\u3053\u3092\u57fa\u6e96\u306bgetOrCreateSegmentIfLive\u3092\u5b9f\u884c\u3059\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u305d\u3057\u3066\u305d\u306e\u51e6\u7406\u306e\u4e2d\u3067observedStreamTime\u304b\u3089retentioPeriod\u3092\u5f15\u3044\u305f\u6642\u9593\u3088\u308a\u3082\u524d\u306eSegment\u3092cleanup\u3059\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">cleanup\u5bfe\u8c61\u306esegment\u306f\u524a\u9664\u30d5\u30e9\u30b0\u3092\u4ed8\u4e0e\u3055\u308c\u3066close\u3055\u308c\u308b\u3002<\/ul>\n<pre class=\"post-pre\"><code>    <span class=\"nd\">@Override<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"no\">S<\/span> <span class=\"nf\">getOrCreateSegmentIfLive<\/span><span class=\"o\">(<\/span><span class=\"kd\">final<\/span> <span class=\"kt\">long<\/span> <span class=\"n\">segmentId<\/span><span class=\"o\">,<\/span>\r\n                                      <span class=\"kd\">final<\/span> <span class=\"nc\">InternalProcessorContext<\/span> <span class=\"n\">context<\/span><span class=\"o\">,<\/span>\r\n                                      <span class=\"kd\">final<\/span> <span class=\"kt\">long<\/span> <span class=\"n\">streamTime<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"kd\">final<\/span> <span class=\"kt\">long<\/span> <span class=\"n\">minLiveTimestamp<\/span> <span class=\"o\">=<\/span> <span class=\"n\">streamTime<\/span> <span class=\"o\">-<\/span> <span class=\"n\">retentionPeriod<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"kd\">final<\/span> <span class=\"kt\">long<\/span> <span class=\"n\">minLiveSegment<\/span> <span class=\"o\">=<\/span> <span class=\"n\">segmentId<\/span><span class=\"o\">(<\/span><span class=\"n\">minLiveTimestamp<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"kd\">final<\/span> <span class=\"no\">S<\/span> <span class=\"n\">toReturn<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">segmentId<\/span> <span class=\"o\">&gt;=<\/span> <span class=\"n\">minLiveSegment<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"c1\">\/\/ The segment is live. get it, ensure it's open, and return it.<\/span>\r\n            <span class=\"n\">toReturn<\/span> <span class=\"o\">=<\/span> <span class=\"n\">getOrCreateSegment<\/span><span class=\"o\">(<\/span><span class=\"n\">segmentId<\/span><span class=\"o\">,<\/span> <span class=\"n\">context<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span> <span class=\"k\">else<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"n\">toReturn<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"o\">}<\/span>\r\n\r\n        <span class=\"n\">cleanupEarlierThan<\/span><span class=\"o\">(<\/span><span class=\"n\">minLiveSegment<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">toReturn<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"kd\">private<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">cleanupEarlierThan<\/span><span class=\"o\">(<\/span><span class=\"kd\">final<\/span> <span class=\"kt\">long<\/span> <span class=\"n\">minLiveSegment<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"kd\">final<\/span> <span class=\"nc\">Iterator<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Map<\/span><span class=\"o\">.<\/span><span class=\"na\">Entry<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Long<\/span><span class=\"o\">,<\/span> <span class=\"no\">S<\/span><span class=\"o\">&gt;&gt;<\/span> <span class=\"n\">toRemove<\/span> <span class=\"o\">=<\/span>\r\n            <span class=\"n\">segments<\/span><span class=\"o\">.<\/span><span class=\"na\">headMap<\/span><span class=\"o\">(<\/span><span class=\"n\">minLiveSegment<\/span><span class=\"o\">,<\/span> <span class=\"kc\">false<\/span><span class=\"o\">).<\/span><span class=\"na\">entrySet<\/span><span class=\"o\">().<\/span><span class=\"na\">iterator<\/span><span class=\"o\">();<\/span>\r\n\r\n        <span class=\"k\">while<\/span> <span class=\"o\">(<\/span><span class=\"n\">toRemove<\/span><span class=\"o\">.<\/span><span class=\"na\">hasNext<\/span><span class=\"o\">())<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"kd\">final<\/span> <span class=\"nc\">Map<\/span><span class=\"o\">.<\/span><span class=\"na\">Entry<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Long<\/span><span class=\"o\">,<\/span> <span class=\"no\">S<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">next<\/span> <span class=\"o\">=<\/span> <span class=\"n\">toRemove<\/span><span class=\"o\">.<\/span><span class=\"na\">next<\/span><span class=\"o\">();<\/span>\r\n            <span class=\"n\">toRemove<\/span><span class=\"o\">.<\/span><span class=\"na\">remove<\/span><span class=\"o\">();<\/span>\r\n            <span class=\"kd\">final<\/span> <span class=\"no\">S<\/span> <span class=\"n\">segment<\/span> <span class=\"o\">=<\/span> <span class=\"n\">next<\/span><span class=\"o\">.<\/span><span class=\"na\">getValue<\/span><span class=\"o\">();<\/span>\r\n            <span class=\"n\">segment<\/span><span class=\"o\">.<\/span><span class=\"na\">close<\/span><span class=\"o\">();<\/span>\r\n            <span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n                <span class=\"n\">segment<\/span><span class=\"o\">.<\/span><span class=\"na\">destroy<\/span><span class=\"o\">();<\/span>\r\n            <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"kd\">final<\/span> <span class=\"nc\">IOException<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n                <span class=\"n\">log<\/span><span class=\"o\">.<\/span><span class=\"na\">error<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Error destroying {}\"<\/span><span class=\"o\">,<\/span> <span class=\"n\">segment<\/span><span class=\"o\">,<\/span> <span class=\"n\">e<\/span><span class=\"o\">);<\/span>\r\n            <span class=\"o\">}<\/span>\r\n        <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u8fd9\u91cc\u6536\u5230\u4e86\u4e00\u6761\u5177\u6709\u76f8\u5f53\u672a\u6765\u65f6\u95f4\u6233\u7684\u8bb0\u5f55\uff0cobservedStreamTime\u5c06\u88ab\u56fa\u5b9a\u5728\u672a\u6765\u7684\u65f6\u95f4\u70b9\u4e0a\uff0c\u8fd9\u6837\u5728\u4ece\u4e2d\u51cf\u53bb\u4fdd\u7559\u671f\u4e4b\u540e\uff0c\u8fc7\u53bb\u7684StateStore\u5c06\u5168\u90e8\u5173\u95ed\u4e14\u65e0\u6cd5\u4f7f\u7528\uff01<\/p>\n<h2>\u7ed3\u8bba 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