{"id":10006869,"date":"2022-11-18T17:40:24","date_gmt":"2022-11-18T09:40:24","guid":{"rendered":"https:\/\/ityet.com\/?p=10006869"},"modified":"2022-11-18T17:40:24","modified_gmt":"2022-11-18T09:40:24","slug":"%e7%be%8e%e5%9b%a2%e5%a4%96%e5%8d%96%e6%90%9c%e7%b4%a2%e5%9f%ba%e4%ba%8eelasticsearch%e7%9a%84%e4%bc%98%e5%8c%96%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006869","title":{"rendered":"\u7f8e\u56e2\u5916\u5356\u641c\u7d22\u57fa\u4e8eElasticsearch\u7684\u4f18\u5316\u5b9e\u8df5"},"content":{"rendered":"

\u7f8e\u56e2\u5916\u5356\u641c\u7d22\u5de5\u7a0b\u56e2\u961f\u5728Elasticsearch\u7684\u4f18\u5316\u5b9e\u8df5\u4e2d\uff0c\u57fa\u4e8eLocation-Based Service\uff08LBS\uff09\u4e1a\u52a1\u573a\u666f\u5bf9Elasticsearch\u7684\u67e5\u8be2\u6027\u80fd\u8fdb\u884c\u4f18\u5316\u3002\u8be5\u4f18\u5316\u57fa\u4e8eRun-Length Encoding\uff08RLE\uff09\u8bbe\u8ba1\u4e86\u4e00\u6b3e\u9ad8\u6548\u7684\u5012\u6392\u7d22\u5f15\u7ed3\u6784\uff0c\u4f7f\u68c0\u7d22\u8017\u65f6\uff08TP99\uff09\u964d\u4f4e\u4e8684%\u3002\u672c\u6587\u4ece\u95ee\u9898\u5206\u6790\u3001\u6280\u672f\u9009\u578b\u3001\u4f18\u5316\u65b9\u6848\u7b49\u65b9\u9762\u8fdb\u884c\u9610\u8ff0\uff0c\u5e76\u7ed9\u51fa\u6700\u7ec8\u7070\u5ea6\u9a8c\u8bc1\u7684\u7ed3\u8bba\u3002<\/p><\/blockquote>\n

1. \u524d\u8a00<\/h2>\n

\u6700\u8fd1\u5341\u5e74\uff0cElasticsearch \u5df2\u7ecf\u6210\u4e3a\u4e86\u6700\u53d7\u6b22\u8fce\u7684\u5f00\u6e90\u68c0\u7d22\u5f15\u64ce\uff0c\u5176\u4f5c\u4e3a\u79bb\u7ebf\u6570\u4ed3\u3001\u8fd1\u7ebf\u68c0\u7d22\u3001B\u7aef\u68c0\u7d22\u7684\u7ecf\u5178\u57fa\u5efa\uff0c\u5df2\u6c89\u6dc0\u4e86\u5927\u91cf\u7684\u5b9e\u8df5\u6848\u4f8b\u53ca\u4f18\u5316\u603b\u7ed3\u3002\u7136\u800c\u5728\u9ad8\u5e76\u53d1\u3001\u9ad8\u53ef\u7528\u3001\u5927\u6570\u636e\u91cf\u7684 C \u7aef\u573a\u666f\uff0c\u76ee\u524d\u53ef\u53c2\u8003\u7684\u8d44\u6599\u5e76\u4e0d\u591a\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u5e0c\u671b\u901a\u8fc7\u5206\u4eab\u5728\u5916\u5356\u641c\u7d22\u573a\u666f\u4e0b\u7684\u4f18\u5316\u5b9e\u8df5\uff0c\u80fd\u4e3a\u5927\u5bb6\u63d0\u4f9b Elasticsearch \u4f18\u5316\u601d\u8def\u4e0a\u7684\u4e00\u4e9b\u501f\u9274\u3002<\/p>\n

\u7f8e\u56e2\u5728\u5916\u5356\u641c\u7d22\u4e1a\u52a1\u573a\u666f\u4e2d\u5927\u89c4\u6a21\u5730\u4f7f\u7528\u4e86 Elasticsearch \u4f5c\u4e3a\u5e95\u5c42\u68c0\u7d22\u5f15\u64ce\u3002\u5176\u5728\u8fc7\u53bb\u51e0\u5e74\u5f88\u597d\u5730\u652f\u6301\u4e86\u5916\u5356\u6bcf\u5929\u5341\u4ebf\u4ee5\u4e0a\u7684\u68c0\u7d22\u6d41\u91cf\u3002\u7136\u800c\u968f\u7740\u4f9b\u7ed9\u4e0e\u6570\u636e\u91cf\u7684\u6025\u5267\u589e\u957f\uff0c\u4e1a\u52a1\u68c0\u7d22\u8017\u65f6\u4e0e CPU \u8d1f\u8f7d\u4e5f\u968f\u4e4b\u4e0a\u6da8\u3002\u901a\u8fc7\u5206\u6790\u6211\u4eec\u53d1\u73b0\uff0c\u5f53\u524d\u68c0\u7d22\u7684\u6027\u80fd\u70ed\u70b9\u4e3b\u8981\u96c6\u4e2d\u5728\u5012\u6392\u94fe\u7684\u68c0\u7d22\u4e0e\u5408\u5e76\u6d41\u7a0b\u4e2d\u3002\u9488\u5bf9\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u57fa\u4e8e Run-length Encoding\uff08RLE\uff09[1]<\/sup> \u6280\u672f\u8bbe\u8ba1\u5b9e\u73b0\u4e86\u4e00\u5957\u9ad8\u6548\u7684\u5012\u6392\u7d22\u5f15\uff0c\u4f7f\u5012\u6392\u94fe\u5408\u5e76\u65f6\u95f4\uff08TP99\uff09\u964d\u4f4e\u4e86 96%\u3002\u6211\u4eec\u5c06\u8fd9\u4e00\u7d22\u5f15\u80fd\u529b\u5f00\u53d1\u6210\u4e86\u4e00\u6b3e\u901a\u7528\u63d2\u4ef6\u96c6\u6210\u5230 Elasticsearch \u4e2d\uff0c\u4f7f\u5f97 Elasticsearch \u7684\u68c0\u7d22\u94fe\u8def\u65f6\u5ef6\uff08TP99\uff09\u964d\u4f4e\u4e86 84%\u3002<\/p>\n

2. \u80cc\u666f<\/h2>\n

\u5f53\u524d\uff0c\u5916\u5356\u641c\u7d22\u4e1a\u52a1\u68c0\u7d22\u5f15\u64ce\u4e3b\u8981\u4e3a Elasticsearch\uff0c\u5176\u4e1a\u52a1\u7279\u70b9\u662f\u5177\u6709\u8f83\u5f3a\u7684 Location Based Service\uff08LBS\uff09 \u4f9d\u8d56\uff0c\u5373\u7528\u6237\u6240\u80fd\u70b9\u9910\u7684\u5546\u5bb6\uff0c\u662f\u7531\u5546\u5bb6\u914d\u9001\u8303\u56f4\u51b3\u5b9a\u7684\u3002\u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u5546\u5bb6\u7684\u914d\u9001\u8303\u56f4\uff0c\u5927\u591a\u91c7\u7528\u591a\u7ec4\u7535\u5b50\u56f4\u680f\u8fdb\u884c\u914d\u9001\u8ddd\u79bb\u7684\u5708\u5b9a\uff0c\u4e00\u4e2a\u5546\u5bb6\u5b58\u5728\u591a\u7ec4\u7535\u5b50\u56f4\u680f\uff0c\u5e76\u4e14\u968f\u7740\u4e1a\u52a1\u7684\u53d8\u5316\u4f1a\u52a8\u6001\u9009\u62e9\u4e0d\u540c\u7684\u914d\u9001\u8303\u56f4\uff0c\u7535\u5b50\u56f4\u680f\u793a\u610f\u56fe\u5982\u4e0b\uff1a<\/p>\n

\"\u56fe1<\/p>\n

\u8003\u8651\u5230\u5546\u5bb6\u914d\u9001\u533a\u57df\u52a8\u6001\u53d8\u66f4\u5e26\u6765\u7684\u95ee\u9898\uff0c\u6211\u4eec\u6ca1\u6709\u4f7f\u7528 Geo Polygon[2]<\/sup> \u7684\u65b9\u5f0f\u8fdb\u884c\u68c0\u7d22\uff0c\u800c\u662f\u901a\u8fc7\u4e0a\u6e38\u4e00\u7ec4 R-tree \u670d\u52a1\u5224\u5b9a\u53ef\u914d\u9001\u7684\u5546\u5bb6\u5217\u8868\u6765\u8fdb\u884c\u5916\u5356\u641c\u7d22\u3002\u56e0\u6b64\uff0cLBS \u573a\u666f\u4e0b\u7684\u4e00\u6b21\u5546\u54c1\u68c0\u7d22\uff0c\u53ef\u4ee5\u8f6c\u5316\u4e3a\u5982\u4e0b\u7684\u4e00\u6b21 Elasticsearch \u641c\u7d22\u8bf7\u6c42\uff1a<\/p>\n

POST food\/_search\n{\n   "query": {\n      "bool": {\n         "must":{\n            "term": { "spu_name": { "value": "\u70e4\u9e2d"} }\n           \/\/...\n         },\n         "filter":{\n           "terms": {\n              "wm_poi_id": [1,3,18,27,28,29,...,37465542] \/\/ \u4e0a\u4e07\n            }\n         }\n      }\n   }\n  \/\/...\n}<\/code><\/pre>\n
\u5bf9\u4e8e\u4e00\u4e2a\u901a\u7528\u7684\u68c0\u7d22\u5f15\u64ce\u800c\u8a00\uff0cTerms \u68c0\u7d22\u975e\u5e38\u9ad8\u6548\uff0c\u5e73\u5747\u5230\u6bcf\u4e2a Term \u67e5\u8be2\u8017\u65f6\u4e0d\u52300.001 ms\u3002\u56e0\u6b64\u5728\u65e9\u671f\u65f6\uff0c\u8fd9\u4e00\u5957\u67b6\u6784\u548c\u68c0\u7d22 DSL \u53ef\u4ee5\u5f88\u597d\u5730\u652f\u6301\u7f8e\u56e2\u7684\u641c\u7d22\u4e1a\u52a1\u2014\u2014\u8017\u65f6\u548c\u8d44\u6e90\u5f00\u9500\u5c1a\u5728\u63a5\u53d7\u8303\u56f4\u5185\u3002\u7136\u800c\u968f\u7740\u6570\u636e\u548c\u4f9b\u7ed9\u7684\u589e\u957f\uff0c\u4e00\u4e9b\u4f9b\u7ed9\u4e30\u5bcc\u533a\u57df\u7684\u9644\u8fd1\u53ef\u914d\u9001\u95e8\u5e97\u53ef\u4ee5\u8fbe\u5230 20000~30000 \u5bb6\uff0c\u8fd9\u5bfc\u81f4\u6027\u80fd\u4e0e\u8d44\u6e90\u95ee\u9898\u9010\u6e10\u51f8\u663e\u3002\u8fd9\u79cd\u4e07\u7ea7\u522b\u7684 Terms \u68c0\u7d22\u7684\u6027\u80fd\u4e0e\u8017\u65f6\u5df2\u7136\u65e0\u6cd5\u5ffd\u7565\uff0c\u4ec5\u4ec5\u8fd9\u4e00\u53e5\u68c0\u7d22\u5c31\u9700\u8981 5~10 ms\u3002<\/p>\n
3. \u6311\u6218\u53ca\u95ee\u9898<\/h2>\n
\u7531\u4e8e Elasticsearch \u5728\u8bbe\u8ba1\u4e0a\u9488\u5bf9\u6d77\u91cf\u7684\u7d22\u5f15\u6570\u636e\u8fdb\u884c\u4f18\u5316\uff0c\u5728\u8fc7\u53bb\u7684 10 \u5e74\u95f4\uff0c\u9010\u6b65\u53bb\u9664\u4e86\u5185\u5b58\u652f\u6301\u7d22\u5f15\u7684\u529f\u80fd\uff08\u4f8b\u5982 RAMDirectory \u7684\u5220\u9664\uff09\u3002\u4e3a\u4e86\u80fd\u591f\u5b9e\u73b0\u8d85\u5927\u89c4\u6a21\u5019\u9009\u96c6\u7684\u68c0\u7d22\uff0cElasticsearch\/Lucene \u5bf9 Term \u5012\u6392\u94fe\u7684\u67e5\u8be2\u6d41\u7a0b\u8bbe\u8ba1\u4e86\u4e00\u5957\u5185\u5b58\u4e0e\u78c1\u76d8\u5171\u540c\u5904\u7406\u7684\u65b9\u6848\u3002<\/p>\n
\u4e00\u6b21 Terms \u68c0\u7d22\u7684\u6d41\u7a0b\u5206\u4e3a\u4e24\u6b65\uff1a\u5206\u522b\u68c0\u7d22\u5355\u4e2a Term \u7684\u5012\u6392\u94fe\uff0c\u591a\u4e2a Term \u7684\u5012\u6392\u94fe\u8fdb\u884c\u5408\u5e76\u3002<\/p>\n
3.1 \u5012\u6392\u94fe\u67e5\u8be2\u6d41\u7a0b<\/h3>\n
    \n
  1. \u4ece\u5185\u5b58\u4e2d\u7684 Term Index \u4e2d\u83b7\u53d6\u8be5 Term \u6240\u5728\u7684 Block \u5728\u78c1\u76d8\u4e0a\u7684\u4f4d\u7f6e\u3002<\/li>\n
  2. \u4ece\u78c1\u76d8\u4e2d\u5c06\u8be5 Block \u7684 TermDictionary \u8bfb\u53d6\u8fdb\u5185\u5b58\u3002<\/li>\n
  3. \u5bf9\u5012\u6392\u94fe\u5b58\u50a8\u683c\u5f0f\u7684\u8fdb\u884c Decode\uff0c\u751f\u6210\u53ef\u7528\u4e8e\u5408\u5e76\u7684\u5012\u6392\u94fe\u3002<\/li>\n<\/ol>\n
    \u53ef\u4ee5\u770b\u5230\uff0c\u8fd9\u4e00\u67e5\u8be2\u6d41\u7a0b\u975e\u5e38\u590d\u6742\u4e14\u8017\u65f6\uff0c\u4e14\u5404\u4e2a\u9636\u6bb5\u7684\u590d\u6742\u5ea6\u90fd\u4e0d\u5bb9\u5ffd\u89c6\u3002\u6240\u6709\u7684 Term \u5728\u7d22\u5f15\u4e2d\u6709\u5e8f\u5b58\u50a8\uff0c\u901a\u8fc7\u4e8c\u5206\u67e5\u627e\u627e\u5230\u76ee\u6807 Term\u3002\u8fd9\u4e2a\u6709\u5e8f\u7684 Term \u5217\u8868\u5c31\u662f TermDictionary \uff0c\u4e8c\u5206\u67e5\u627e Term \u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(logN) \uff0c\u5176\u4e2d N \u662f Term \u7684\u603b\u6570\u91cf \u3002Lucene \u91c7\u7528 Finite State Transducer[3]<\/sup>\uff08FST\uff09\u5bf9 TermDictionary \u8fdb\u884c\u7f16\u7801\u6784\u5efa Term Index\u3002FST \u53ef\u5bf9 Term \u7684\u516c\u5171\u524d\u7f00\u3001\u516c\u5171\u540e\u7f00\u8fdb\u884c\u62c6\u5206\u4fdd\u5b58\uff0c\u5927\u5927\u538b\u7f29\u4e86 TermDictionary \u7684\u4f53\u79ef\uff0c\u63d0\u9ad8\u4e86\u5185\u5b58\u6548\u7387\uff0cFST \u7684\u68c0\u7d22\u901f\u5ea6\u662f O(len(term))\uff0c\u5176\u5bf9\u4e8e M \u4e2a Term \u7684\u68c0\u7d22\u590d\u6742\u5ea6\u4e3a O(M * len(term))\u3002<\/p>\n
    3.2 \u5012\u6392\u94fe\u5408\u5e76\u6d41\u7a0b<\/h3>\n
    \u5728\u7ecf\u8fc7\u4e0a\u8ff0\u7684\u67e5\u8be2\uff0c\u68c0\u7d22\u51fa\u6240\u6709\u76ee\u6807 Term \u7684 Posting List \u540e\uff0c\u9700\u8981\u5bf9\u8fd9\u4e9b Posting List \u6c42\u5e76\u96c6\uff08OR \u64cd\u4f5c\uff09\u3002\u5728 Lucene \u7684\u5f00\u6e90\u5b9e\u73b0\u4e2d\uff0c\u5176\u91c7\u7528 Bitset \u4f5c\u4e3a\u5012\u6392\u94fe\u5408\u5e76\u7684\u5bb9\u5668\uff0c\u7136\u540e\u904d\u5386\u6240\u6709\u5012\u6392\u94fe\u4e2d\u7684\u6bcf\u4e00\u4e2a\u6587\u6863\uff0c\u5c06\u5176\u52a0\u5165 DocIdSet \u4e2d\u3002<\/p>\n
    \u4f2a\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
    Input:  termsEnum: \u5012\u6392\u8868\uff1btermIterator\uff1a\u5019\u9009\u7684term\nOutput: docIdSet : final docs set\nfor term in termIterator:\n  if termsEnum.seekExact(term) != null:\n     docs = read_disk()  \/\/ \u78c1\u76d8\u8bfb\u53d6\n     docs = decode(docs) \/\/ \u5012\u6392\u94fe\u7684decode\u6d41\u7a0b\n     for doc in docs:\n        docIdSet.or(doc) \/\/\u4ee3\u7801\u5b9e\u73b0\u4e3aDocIdSetBuilder.add\u3002\nend for\ndocIdSet.build()\/\/\u5408\u5e76\uff0c\u6392\u5e8f\uff0c\u6700\u7ec8\u751f\u6210DocIdSetBuilder\uff0c\u5bf9\u5e94\u706b\u7130\u56fe\u6700\u540e\u4e00\u6bb5\u3002<\/code><\/pre>\n
    \u5047\u8bbe\u6211\u4eec\u6709 M \u4e2a Term\uff0c\u6bcf\u4e2a Term \u5bf9\u5e94\u5012\u6392\u94fe\u7684\u5e73\u5747\u957f\u5ea6\u4e3a K\uff0c\u90a3\u4e48\u5408\u5e76\u8fd9 M \u4e2a\u5012\u6392\u94fe\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a\uff1aO(K  M + log(K <\/em> M))\u3002 \u53ef\u4ee5\u770b\u51fa\u5012\u6392\u94fe\u5408\u5e76\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e0e Terms \u7684\u6570\u91cf M \u5448\u7ebf\u6027\u76f8\u5173\u3002\u5728\u6211\u4eec\u7684\u573a\u666f\u4e0b\uff0c\u5047\u8bbe\u4e00\u4e2a\u5546\u5bb6\u5e73\u5747\u6709\u4e00\u5343\u4e2a\u5546\u54c1\uff0c\u4e00\u6b21\u641c\u7d22\u8bf7\u6c42\u9700\u8981\u5bf9\u4e00\u4e07\u4e2a\u5546\u5bb6\u8fdb\u884c\u68c0\u7d22\uff0c\u90a3\u4e48\u6700\u7ec8\u9700\u8981\u5408\u5e76\u4e00\u5343\u4e07\u4e2a\u5546\u54c1\uff0c\u5373\u5faa\u73af\u6267\u884c\u4e00\u5343\u4e07\u6b21\uff0c\u5bfc\u81f4\u8fd9\u4e00\u95ee\u9898\u88ab\u653e\u5927\u81f3\u65e0\u6cd5\u88ab\u5ffd\u7565\u7684\u7a0b\u5ea6\u3002<\/p>\n
    \u6211\u4eec\u4e5f\u9488\u5bf9\u5f53\u524d\u7684\u7cfb\u7edf\u505a\u4e86\u5927\u91cf\u7684\u8c03\u7814\u53ca\u5206\u6790\uff0c\u901a\u8fc7\u7f8e\u56e2\u5185\u90e8\u7684 JVM Profile \u7cfb\u7edf\u5f97\u5230 CPU \u7684\u706b\u7130\u56fe\uff0c\u53ef\u4ee5\u770b\u5230\u8fd9\u4e00\u6d41\u7a0b\u5728 CPU \u70ed\u70b9\u56fe\u4e2d\u7684\u53cd\u6620\u4e5f\u662f\u5982\u6b64\uff1a\u65e0\u8bba\u662f\u67e5\u8be2\u5012\u6392\u94fe\u3001\u8fd8\u662f\u8bfb\u53d6\u3001\u5408\u5e76\u5012\u6392\u94fe\u90fd\u76f8\u5f53\u6d88\u8017\u8d44\u6e90\uff0c\u5e76\u4e14\u53ef\u4ee5\u9884\u89c1\u7684\u662f\uff0c\u5728\u4f9b\u7ed9\u8d8a\u6765\u8d8a\u591a\u7684\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e09\u4e2a\u9636\u6bb5\u7684\u8017\u65f6\u8fd8\u4f1a\u6301\u7eed\u589e\u957f\u3002<\/p>\n
    \"\u56fe2<\/p>\n
    \u53ef\u4ee5\u660e\u786e\uff0c\u6211\u4eec\u9700\u8981\u9488\u5bf9\u5012\u6392\u94fe\u67e5\u8be2\u3001\u5012\u6392\u94fe\u5408\u5e76\u8fd9\u4e24\u4e2a\u95ee\u9898\u4e88\u4ee5\u4f18\u5316\u3002<\/p>\n
    4. \u6280\u672f\u63a2\u7d22\u4e0e\u5b9e\u8df5<\/h2>\n
    4.1 \u5012\u6392\u94fe\u67e5\u8be2\u4f18\u5316<\/h3>\n
    \u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528 FST \u4f5c\u4e3a Term \u68c0\u7d22\u7684\u6570\u636e\u7ed3\u6784\uff0c\u53ef\u4ee5\u5728\u5185\u5b58\u5f00\u9500\u548c\u8ba1\u7b97\u5f00\u9500\u4e0a\u53d6\u5f97\u4e00\u4e2a\u5f88\u597d\u7684\u5e73\u8861\uff0c\u540c\u65f6\u652f\u6301\u524d\u7f00\u68c0\u7d22\u3001\u6b63\u5219\u68c0\u7d22\u7b49\u591a\u79cd\u591a\u6837\u7684\u68c0\u7d22 Query\uff0c\u7136\u800c\u5728\u6211\u4eec\u7684\u573a\u666f\u4e4b\u4e0b\uff0cFST \u5e26\u6765\u7684\u8ba1\u7b97\u5f00\u9500\u65e0\u6cd5\u88ab\u5ffd\u89c6\u3002<\/p>\n
    \u8003\u8651\u5230\u5728\u5916\u5356\u641c\u7d22\u573a\u666f\u6709\u4ee5\u4e0b\u51e0\u4e2a\u7279\u6027\uff1a<\/p>\n
      \n
    • Term \u7684\u6570\u636e\u7c7b\u578b\u4e3a long \u7c7b\u578b\u3002<\/li>\n
    • \u65e0\u8303\u56f4\u68c0\u7d22\uff0c\u5747\u4e3a\u5b8c\u5168\u5339\u914d\u3002<\/li>\n
    • \u65e0\u524d\u7f00\u5339\u914d\u3001\u6a21\u7cca\u67e5\u627e\u7684\u9700\u6c42\uff0c\u4e0d\u9700\u8981\u4f7f\u7528\u524d\u7f00\u6811\u76f8\u5173\u7684\u7279\u6027\u3002<\/li>\n
    • \u5019\u9009\u6570\u91cf\u53ef\u63a7\uff0c\u6bcf\u4e2a\u5546\u5bb6\u7684\u5546\u54c1\u6570\u91cf\u8f83\u591a\uff0c\u5373 Term \u89c4\u6a21\u53ef\u9884\u671f\uff0c\u5185\u5b58\u53ef\u4ee5\u627f\u8f7d\u8fd9\u4e2a\u6570\u91cf\u7ea7\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n
      \u56e0\u6b64\u5728\u6211\u4eec\u7684\u5e94\u7528\u573a\u666f\u4e2d\u4f7f\u7528\u7a7a\u95f4\u6362\u53d6\u65f6\u95f4\u662f\u503c\u5f97\u7684\u3002<\/p>\n
      \u5bf9\u4e8e Term \u67e5\u8be2\u7684\u70ed\u70b9\uff1a\u53ef\u66ff\u6362 FST \u7684\u5b9e\u73b0\u4ee5\u51cf\u5c11 CPU \u5f00\u9500\uff0c\u5e38\u89c1\u7684\u67e5\u627e\u6570\u636e\u7ed3\u6784\u4e2d\uff0c\u54c8\u5e0c\u8868\u6709 O(1) \u7684\u67e5\u8be2\u590d\u6742\u5ea6\uff0c\u5c06 Term \u67e5\u627e\u8f6c\u53d8\u4e3a\u5bf9\u54c8\u5e0c\u8868\u7684\u4e00\u6b21\u67e5\u8be2\u3002<\/p>\n
      \u5bf9\u4e8e\u54c8\u5e0c\u8868\u7684\u9009\u53d6\uff0c\u6211\u4eec\u4e3b\u8981\u9009\u62e9\u4e86\u5e38\u89c1\u7684 HashMap \u548c LongObjectHashMap\u3002<\/p>\n
      \u6211\u4eec\u4e3b\u8981\u5bf9\u6bd4\u4e86 FST\u3001HashMap \u548c LongObjectHashMap\uff08\u54c8\u5e0c\u8868\u7684\u4e00\u79cd\u9ad8\u6027\u80fd\u5b9e\u73b0\uff09\u7684\u7a7a\u95f4\u548c\u65f6\u95f4\u6548\u7387\u3002<\/p>\n
        \n
      • \u5728\u5185\u5b58\u5360\u7528\u4e0a<\/strong>\uff1aFST \u7684\u5185\u5b58\u6548\u7387\u6781\u4f73\u3002\u800c HashMap\/LongObjectHashMap \u90fd\u6709\u660e\u663e\u7684\u52a3\u52bf\uff1b<\/li>\n
      • \u5728\u67e5\u8be2\u65f6\u95f4\u4e0a<\/strong>\uff1aFST \u7684\u67e5\u8be2\u590d\u6742\u5ea6\u5728 O (len(term))\uff0c\u800c Hash\/LongObjectHashMap \u6709\u7740 O(1) \u7684\u67e5\u8be2\u6027\u80fd\uff1b<\/li>\n<\/ul>\n
        \u6ce8\uff1a\u68c0\u7d22\u7c7b\u578b\u867d\u7136\u4e3a Long\uff0c\u4f46\u662f\u6211\u4eec\u5c06\u5e95\u5c42\u5b58\u50a8\u683c\u5f0f\u8fdb\u884c\u4e86\u8c03\u6574\uff0c\u6ca1\u6709\u4f7f\u7528\u5f00\u6e90\u7684 BKD Tree \u5b9e\u73b0\uff0c\u4f7f\u7528 FST \u7ed3\u6784\uff0c\u4ec5\u4e0e FST \u8fdb\u884c\u5bf9\u6bd4\u3002BKD Tree \u5728\u5927\u6279\u91cf\u6574\u6570 terms \u7684\u573a\u666f\u4e0b\u52a3\u52bf\u66f4\u4e3a\u660e\u663e\u3002<\/p><\/blockquote>\n
        \u6211\u4eec\u4f7f\u7528\u5341\u4e07\u4e2a <Long, Long> \u7684\u952e\u503c\u5bf9\u6765\u6784\u9020\u6570\u636e\uff0c\u5bf9\u5176\u7a7a\u95f4\u53ca\u6027\u80fd\u8fdb\u884c\u4e86\u5bf9\u6bd4\uff0c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n\n\n\n\n\n
         <\/th>\n\u5185\u5b58\u5360\u7528<\/th>\n10 \u4e07\u4e2a Key \u7684\u67e5\u8be2\u65f6\u95f4<\/th>\n<\/tr>\n<\/thead>\n
        FST<\/td>\n481kB<\/td>\n63ms<\/td>\n<\/tr>\n
        HashMap<\/td>\n9048kB<\/td>\n3.5ms<\/td>\n<\/tr>\n
        LongObjectHashMap<\/td>\n5545kB<\/td>\n1ms<\/td>\n<\/tr>\n
        \u7ed3\u8bba<\/td>\nFST >> LongObjectHashMap > HashMap<\/td>\nLongObjectHashMap > HashMap >> FST<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
        \u53ef\u4ee5\u770b\u5230\uff0c \u5728\u5185\u5b58\u5360\u7528\u4e0a FST \u8981\u8fdc\u4f18\u4e8e LongObjectHashMap \u548c HashMap\u3002\u800c\u5728\u67e5\u8be2\u901f\u5ea6\u4e0a LongObjectHashMap \u6700\u4f18\u3002<\/p>\n
        \u6211\u4eec\u6700\u7ec8\u9009\u62e9\u4e86 LongObjectHashMap \u4f5c\u4e3a\u5012\u6392\u94fe\u67e5\u8be2\u7684\u6570\u636e\u7ed3\u6784\u3002<\/p>\n
        4.2 \u5012\u6392\u94fe\u5408\u5e76<\/h3>\n
        \u57fa\u4e8e\u4e0a\u8ff0\u95ee\u9898\uff0c\u6211\u4eec\u9700\u8981\u89e3\u51b3\u4e24\u4e2a\u660e\u663e\u7684 CPU \u70ed\u70b9\u95ee\u9898\uff1a\u5012\u6392\u94fe\u8bfb\u53d6 & \u5012\u6392\u94fe\u5408\u5e76\u3002\u6211\u4eec\u9700\u8981\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7ed3\u6784\u7f13\u5b58\u5012\u6392\u94fe\uff0c\u4e0d\u518d\u6267\u884c\u78c1\u76d8 \/page cache \u7684 IO\u3002\u6570\u636e\u7ed3\u6784\u9700\u8981\u5fc5\u987b\u6ee1\u8db3\u4ee5\u4e0b\u6761\u4ef6\uff1a<\/p>\n
          \n
        • \u652f\u6301\u6279\u91cf Merge\uff0c\u51cf\u5c11\u5012\u6392\u94fe Merge \u8017\u65f6\u3002<\/li>\n
        • \u5185\u5b58\u5360\u7528\u5c11\uff0c\u9700\u8981\u5904\u7406\u5343\u4e07\u6570\u91cf\u7ea7\u7684\u5012\u6392\u94fe\u3002<\/li>\n<\/ul>\n
          \u5728\u7ed9\u51fa\u5177\u4f53\u7684\u89e3\u51b3\u65b9\u6848\u4e4b\u524d\uff0c\u5148\u4ecb\u7ecd\u4e00\u4e0b Lucene \u5bf9\u4e8e\u5012\u6392\u5408\u5e76\u7684\u539f\u751f\u5b9e\u73b0\u3001RoaringBitMap\u3001Index Sorting\u3002<\/p>\n
          4.2.1 \u539f\u751f\u5b9e\u73b0<\/h4>\n
          Lucene\u5728\u4e0d\u540c\u573a\u666f\u4e0a\u4f7f\u7528\u4e86\u4e0d\u540c\u7684\u5012\u6392\u683c\u5f0f\uff0c\u63d0\u9ad8\u6574\u4f53\u7684\u6548\u7387\uff08\u7a7a\u95f4\/\u65f6\u95f4\uff09\uff0c\u901a\u8fc7\u706b\u7130\u56fe\u53ef\u4ee5\u53d1\u73b0\uff0c\u5728\u6211\u4eec\u7684\u573a\u666f\u4e0a\uff0cTermInSetQuery \u7684\u5012\u6392\u5408\u5e76\u903b\u8f91\u5f00\u9500\u6700\u5927\u3002<\/p>\n
          TermInSetQuery \u7684\u5012\u6392\u94fe\u5408\u5e76\u64cd\u4f5c\u5206\u4e3a\u4e24\u4e2a\u6b65\u9aa4\uff1a\u5012\u6392\u94fe\u8bfb\u53d6\u548c\u5408\u5e76\u3002<\/p>\n
            \n
          1. \n
            \u5012\u6392\u94fe\u8bfb\u53d6\uff1a<\/p>\n
            Lucene \u5012\u6392\u94fe\u538b\u7f29\u5b58\u50a8\u5728\u7d22\u5f15\u6587\u4ef6\u4e2d\uff0c\u5012\u6392\u94fe\u8bfb\u53d6\u9700\u8981\u5b9e\u65f6\u89e3\u6790\uff0c\u5176\u5bf9\u5916\u66b4\u9732\u7684 API \u4e3a\u8fed\u4ee3\u5668\u7ed3\u6784\u3002<\/p>\n<\/li>\n
          2. \n
            \u5012\u6392\u94fe\u5408\u5e76\uff1a<\/p>\n
            \u5012\u6392\u94fe\u5408\u5e76\u4e3b\u8981\u7531 DocIdSetBuilder \u5408\u5e76\u751f\u6210\u5012\u6392\u94fe\uff0c\u5148\u4f7f\u7528\u7a00\u758f\u7ed3\u6784\u5b58\u50a8 Doc ID\uff0c\u5f53  Doc ID \u4e2a\u6570\u8d85\u8fc7\u4e00\u5b9a\u9608\u503c\u65f6\uff0c\u5347\u7ea7\u5230\u7a20\u5bc6\u7ed3\u6784\uff08FixedBitSet\uff09\u5b58\u50a8\uff0c\u5b9e\u73b0\u65b9\u5f0f\u5982\u4e0b\uff08\u5bf9\u5e94\u4ee3\u7801 IntArrayDocIdSet\/BitDocIdSet\uff09\uff1a<\/p>\n
              \n
            • \u7a00\u758f\u6570\u636e\uff1a\u5b58\u50a8\u91c7\u7528 List<int[]> array \u65b9\u5f0f\u5b58\u50a8 Doc ID\uff0c\u6700\u7ec8\u7ecf\u8fc7 Merge \u548c\u6392\u5e8f\u5f62\u6210\u4e00\u4e2a\u6709\u5e8f\u6570\u7ec4 int[]\uff0c\u8017\u65f6\u4e3b\u8981\u96c6\u4e2d\u5728\u6570\u7ec4\u7533\u8bf7\u548c\u6392\u5e8f\u3002<\/li>\n
            • \u7a20\u5bc6\u6570\u636e\uff1a\u57fa\u4e8e long[] \u5b9e\u73b0\u7684 bitmap \u7ed3\u6784\uff08FixedBitSet\uff09\uff0c\u8017\u65f6\u4e3b\u8981\u96c6\u4e2d\u5728 FixedBitSet \u7684\u63d2\u5165\u8fc7\u7a0b\uff0c\u7531\u4e8e\u5012\u6392\u94fe\u9700\u8981\u5b9e\u65f6 Decode \u4ee5\u53ca FixedBitSet \u7684\u5e95\u5c42\u5b9e\u73b0\uff0c\u65e0\u6cd5\u5b9e\u73b0\u6279\u91cf Merge\uff0c\u53ea\u80fd\u5faa\u73af\u5355\u4e2a Doc ID \u63d2\u5165\uff0c\u6570\u636e\u91cf\u5927\u7684\u60c5\u51b5\u4e0b\uff0c\u8017\u65f6\u660e\u663e\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
              \u6211\u4eec\u91c7\u7528\u7ebf\u4e0a\u6d41\u91cf\u548c\u6570\u636e\u538b\u6d4b\u53d1\u73b0\u8be5\u90e8\u5206\u5e73\u5747\u8017\u65f6\u7ea6 7 ms\u3002<\/p><\/blockquote>\n
              4.2.2 RoaringBitmap<\/h4>\n
              \u5f53\u524d Elasticsearch \u9009\u62e9 RoaringBitMap \u505a\u4e3a Query Cache \u7684\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u7f13\u5b58\u5012\u6392\u94fe\uff0c\u52a0\u5feb\u67e5\u8be2\u901f\u7387\u3002<\/p>\n
              RoaringBitmap \u662f\u4e00\u79cd\u538b\u7f29\u7684\u4f4d\u56fe\uff0c\u76f8\u8f83\u4e8e\u5e38\u89c4\u7684\u538b\u7f29\u4f4d\u56fe\u80fd\u63d0\u4f9b\u66f4\u597d\u7684\u538b\u7f29\uff0c\u5728\u7a00\u758f\u6570\u636e\u7684\u573a\u666f\u4e0b\u7a7a\u95f4\u66f4\u6709\u4f18\u52bf\u3002\u4ee5\u5b58\u653e Integer \u4e3a\u4f8b\uff0cRoaring Bitmap \u4f1a\u5bf9\u5b58\u5165\u7684\u6570\u636e\u8fdb\u884c\u5206\u6876\uff0c\u6bcf\u4e2a\u6876\u90fd\u6709\u81ea\u5df1\u5bf9\u5e94\u7684 Container\u3002\u5728\u5b58\u5165\u4e00\u4e2a32\u4f4d\u7684\u6574\u6570\u65f6\uff0c\u5b83\u4f1a\u628a\u6574\u6570\u5212\u5206\u4e3a\u9ad8 16 \u4f4d\u548c\u4f4e 16 \u4f4d\uff0c\u5176\u4e2d\u9ad8 16 \u4f4d\u51b3\u5b9a\u8be5\u6570\u636e\u9700\u8981\u88ab\u5206\u81f3\u54ea\u4e2a\u6876\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5b58\u50a8\u8fd9\u4e2a\u6570\u636e\u5269\u4f59\u7684\u4f4e 16 \u4f4d\uff0c\u5c06\u4f4e 16 \u4f4d\u5b58\u50a8\u5230 Container \u4e2d\uff0c\u82e5\u5f53\u524d\u6876\u4e0d\u5b58\u5728\u6570\u636e\uff0c\u76f4\u63a5\u5b58\u50a8 null \u8282\u7701\u7a7a\u95f4\u3002 RoaringBitmap\u6709\u4e0d\u540c\u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u4e0b\u9762\u4ee5 Lucene \u5b9e\u73b0\uff08RoaringDocIdSet\uff09\u8fdb\u884c\u8be6\u7ec6\u8bb2\u89e3\uff1a<\/p>\n
              \u5982\u539f\u7406\u56fe\u4e2d\u6240\u793a\uff0cRoaringBitmap \u4e2d\u5b58\u5728\u4e24\u79cd\u4e0d\u540c\u7684 Container\uff1aBitmap Container \u548c Array Container\u3002<\/p>\n
              \"\u56fe3<\/p>\n
              \u8fd9\u4e24\u79cd Container \u5206\u522b\u5bf9\u5e94\u4e0d\u540c\u7684\u6570\u636e\u573a\u666f\u2014\u2014\u82e5\u4e00\u4e2a Container \u4e2d\u7684\u6570\u636e\u91cf\u5c0f\u4e8e 4096 \u4e2a\u65f6\uff0c\u4f7f\u7528 Array Container \u6765\u5b58\u50a8\u3002\u5f53 Array Container \u4e2d\u5b58\u653e\u7684\u6570\u636e\u91cf\u5927\u4e8e 4096 \u65f6\uff0cRoaring Bitmap \u4f1a\u5c06 Array Container \u8f6c\u4e3a Bitmap Container\u3002\u5373 Array Container \u7528\u4e8e\u5b58\u653e\u7a00\u758f\u6570\u636e\uff0c\u800c Bitmap Container \u7528\u4e8e\u5b58\u653e\u7a20\u5bc6\u6570\u636e\uff0c\u8fd9\u6837\u505a\u662f\u4e3a\u4e86\u5145\u5206\u5229\u7528\u7a7a\u95f4\u3002\u4e0b\u56fe\u7ed9\u51fa\u4e86\u968f\u7740\u5bb9\u91cf\u589e\u957f Array Container \u548c Bitmap Container \u7684\u7a7a\u95f4\u5360\u7528\u5bf9\u6bd4\u56fe\uff0c\u5f53\u5143\u7d20\u4e2a\u6570\u8fbe\u5230 4096 \u540e\uff08\u6bcf\u4e2a\u5143\u7d20\u5360\u7528 16 bit \uff09\uff0cArray Container \u7684\u7a7a\u95f4\u8981\u5927\u4e8e Bitmap Container\u3002<\/p>\n
              \u5907\u6ce8\uff1aRoaring Bitmap \u53ef\u53c2\u8003\u5b98\u65b9\u535a\u5ba2[4]<\/sup>\u3002<\/p>\n
              4.2.3 Index Sorting<\/h4>\n
              Elasticsearch \u4ece 6.0 \u7248\u672c\u5f00\u59cb\u652f\u6301 Index Sorting[5]<\/sup> \u529f\u80fd\uff0c\u5728\u7d22\u5f15\u9636\u6bb5\u53ef\u4ee5\u914d\u7f6e\u591a\u4e2a\u5b57\u6bb5\u8fdb\u884c\u6392\u5e8f\uff0c\u8c03\u6574\u7d22\u5f15\u6570\u636e\u7ec4\u7ec7\u65b9\u5f0f\uff0c\u53ef\u4ee5\u8c03\u6574\u6587\u6863\u6240\u5bf9\u5e94\u7684 Doc ID\u3002\u4ee5 city_id\uff0cpoi_id \u4e3a\u4f8b\uff1a<\/p>\n
              \"\u56fe4<\/p>\n
              \u5982\u4e0a\u793a\u4f8b\u6240\u793a\uff1aIndex Sorting \u4f1a\u5c06\u7ed9\u5b9a\u7684\u6392\u5e8f\u5b57\u6bb5\uff08\u5982\u4e0a\u56fe\u7684 city_id \u5b57\u6bb5\uff09\u7684\u6587\u6863\u6392\u5e8f\u5728\u4e00\u8d77\uff0c\u76f8\u540c\u6392\u5e8f\u503c\u7684\u6587\u6863\u7684 Doc ID \u4e25\u683c\u81ea\u589e\uff0c\u5bf9\u8be5\u5b57\u6bb5\u5efa\u7acb\u5012\u6392\uff0c\u90a3\u4e48\u5176\u5012\u6392\u94fe\u4e3a\u81ea\u589e\u6570\u5217\u3002<\/p>\n
              4.3 \u57fa\u4e8e RLE \u7684\u5012\u6392\u683c\u5f0f\u8bbe\u8ba1<\/h3>\n
              \u57fa\u4e8e\u4ee5\u4e0a\u7684\u80cc\u666f\u77e5\u8bc6\u4ee5\u53ca\u5f53\u524d Elasticsearch\/Lucene \u7684\u89e3\u51b3\u65b9\u6848\uff0c\u53ef\u4ee5\u660e\u786e\u76ee\u524d\u6709 2 \u4e2a\u6539\u9020\u70b9\u9700\u8981\u8003\u8651\u3002<\/p>\n
                \n
              • \u5408\u9002\u7684\u5012\u6392\u7ed3\u6784\uff0c\u7528\u4e8e\u5b58\u50a8\u6bcf\u4e2a Term \u7684\u5012\u6392\u94fe\u3002<\/li>\n
              • \u5408\u9002\u7684\u4e2d\u95f4\u7ed3\u6784\uff0c\u7528\u4e8e\u5b58\u50a8\u591a\u4e2a Term \u5408\u5e76\u540e\u7684\u5012\u6392\u94fe\u3002<\/li>\n<\/ul>\n
                \u5bf9\u4e8e\u7d22\u5f15\u5012\u6392\u683c\u5f0f PostingsEnum\uff0c\u652f\u6301\u63a5\u53e3\u4e3a\uff1a<\/p>\n
                public abstract class DocIdSetIterator {\n  public abstract int docID();\n  public abstract int nextDoc();\n  public abstract int advance(int target);\n}<\/code><\/pre>\n
                \u5012\u6392\u4ec5\u652f\u6301\u5355\u6587\u6863\u5faa\u73af\u8c03\u7528\uff0c\u4e0d\u652f\u6301\u6279\u91cf\u8bfb\u53d6\uff0c\u56e0\u6b64\u9700\u8981\u4e3a\u5012\u6392\u589e\u52a0\u6279\u91cf\u987a\u5e8f\u8bfb\u53d6\u7684\u529f\u80fd\u3002<\/p>\n
                \u5bf9\u4e8e\u591a\u5012\u6392\u94fe\u7684\u5408\u5e76\uff0c\u7531\u4e8e\u539f\u7ed3\u6784 DocIdSetBuilder \u7684\u5b9e\u73b0\u4e5f\u4e0d\u652f\u6301\u6279\u91cf\u5bf9\u6570\u636e\u8fdb\u884c\u5408\u5e76\uff0c\u6211\u4eec\u63a2\u7d22\u4e86\u8bc4\u4f30\u4e86 Elasticsearch \u7528\u4e8e\u7f13\u5b58 Query Cache \u7684\u6570\u636e\u7ed3\u6784 RoaringBitMap\uff0c\u7136\u800c\u5176\u5b9e\u73b0 RoaringDocIdSet \u4e5f\u65e0\u6cd5\u6ee1\u8db3\u6211\u4eec\u5bf9\u7f13\u5b58\u6570\u636e\u7ed3\u6784\u7279\u6027\u9700\u6c42\uff0c\u4e3b\u8981\u95ee\u9898\uff1a<\/p>\n
                  \n
                • \u539f\u751f RoaringDocIdSet \u5728\u6784\u5efa\u65f6\uff0c\u53ea\u80fd\u652f\u6301\u9012\u589e\u7684\u6dfb\u52a0 Doc ID\u3002\u800c\u5728\u5b9e\u9645\u751f\u4ea7\u4e2d\u6bcf\u4e00\u4e2a\u5546\u5bb6\u7684\u5546\u54c1\u7684 Doc ID \u90fd\u662f\u79bb\u6563\u7684\u3002\u8fd9\u5c31\u9650\u5236\u4e86\u5176\u4f7f\u7528\u8303\u56f4\u3002<\/li>\n
                • \u539f\u751f RoaringDocIdSet \u7684\u5e95\u5c42\u5b58\u50a8\u7ed3\u6784 Bitmap Container \u548c Array Container \u5747\u4e0d\u652f\u6301\u6279\u91cf\u5408\u5e76\uff0c\u8fd9\u5c31\u65e0\u6cd5\u6ee1\u8db3\u6211\u4eec\u5bf9\u5012\u6392\u94fe\u5408\u5e76\u8fdb\u884c\u4f18\u5316\u7684\u9700\u6c42\u3002<\/li>\n<\/ul>\n
                  \u5728\u660e\u786e\u8fd9\u4e2a\u95ee\u9898\u7684\u573a\u666f\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u8003\u8651\u6700\u7b80\u5355\u7684\u6539\u9020\uff0c\u652f\u6301\u7d22\u5f15\u5012\u6392\u683c\u5f0f PostingsEnum \u7684\u6279\u91cf\u8bfb\u53d6\u3002\u5e76\u8003\u8651\u4e86\u5982\u4e0b\u51e0\u79cd\u573a\u666f\uff1a<\/p>\n
                    \n
                  • \u5728\u652f\u6301\u6279\u91cf\u8bfb\u53d6\u5012\u6392\u7684\u60c5\u51b5\u4e0b\uff0c\u76f4\u63a5\u4f7f\u7528\u539f\u7ed3\u6784 DocIdSetBuilder \u8fdb\u884c\u6279\u91cf\u7684\u5408\u5e76\u3002<\/li>\n
                  • \u5728\u652f\u6301\u6279\u91cf\u8bfb\u53d6\u5012\u6392\u7684\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528 RoaringBitMap \u8fdb\u884c\u6279\u91cf\u5408\u5e76\u3002<\/li>\n<\/ul>\n
                    \u7136\u800c\u6211\u4eec\u53d1\u73b0\u5373\u4f7f\u5bf9 bitset \u8fdb\u884c\u5206\u6bb5\u5408\u5e76\uff0c\u76f4\u63a5\u5bf9\u6570\u636e\u6210\u6bb5\u8fdb\u884c OR \u64cd\u4f5c\uff0c\u6574\u4f53\u5f00\u9500\u4e0b\u964d\u5e76\u4e0d\u660e\u663e\u3002\u5176\u539f\u56e0\u4e3b\u8981\u5728\u4e8e\uff1a\u5bf9\u4e8e\u8bfb\u53d6\u7684\u6279\u91cf\u7ed3\u679c\uff0c\u5747\u4e3a\u7a00\u758f\u5206\u5e03\u7684 Doc ID\uff0c\u4ec5\u51cf\u5c11\u5012\u6392\u7684\u5faa\u73af\u8c03\u7528\u65e0\u6cd5\u89e3\u51b3\u6027\u80fd\u5f00\u9500\u95ee\u9898\u3002<\/p>\n
                    \u90a3\u4e48\u95ee\u9898\u9700\u8981\u8f6c\u5316\u4e3a\u5982\u4f55\u89e3\u51b3 Doc ID \u5206\u5e03\u7a00\u758f\u7684\u95ee\u9898\u3002\u5728\u4e0a\u6587\u63d0\u53ca\u7684 Index Sorting \u5373\u4e00\u4e2a\u7edd\u4f73\u7684\u89e3\u51b3\u65b9\u6848\u3002\u5e76\u4e14\u7531\u4e8e\u4e1a\u52a1 LBS \u7684\u7279\u70b9\uff0c\u4e00\u6b21\u68c0\u7d22\u7684\u5168\u90e8\u7ed3\u679c\u96c6\u5747\u96c6\u4e2d\u5728\u67d0\u4e2a\u5730\u7406\u4f4d\u7f6e\u9644\u8fd1\uff0c\u4ee5\u53ca\u6211\u4eec\u68c0\u7d22\u4ec5\u9488\u5bf9\u95e8\u5e97\u5217\u8868 ID \u7684\u7279\u6b8a\u573a\u666f\uff0c\u6211\u4eec\u6700\u7ec8\u9009\u62e9\u5bf9\u57ce\u5e02 ID\u3001 Geohash\u3001\u95e8\u5e97 ID \u8fdb\u884c\u6392\u5e8f\uff0c\u4ece\u800c\u8ba9\u7a00\u758f\u5206\u5e03\u7684 Doc ID \u5f62\u6210\u8fde\u7eed\u5206\u5e03\u3002\u5728\u8fd9\u6837\u7684\u6392\u5e8f\u89c4\u5219\u5e94\u7528\u4e4b\u540e\uff0c\u6211\u4eec\u5f97\u5230\u4e86\u4e00\u7ec4\u7edd\u4f73\u7684\u7279\u6027\uff1a\u6bcf\u4e00\u4e2a\u5546\u5bb6\u6240\u5bf9\u5e94\u7684\u5546\u54c1\uff0c\u5176 Doc ID \u5b8c\u5168\u8fde\u7eed\u3002<\/p>\n
                    4.3.1 Run-Length Encoding<\/h4>\n
                    Run-Length Encoding[3]<\/sup>\uff08RLE\uff09\u6280\u672f\u8bde\u751f\u4e8e50\u5e74\u524d\uff0c\u6700\u65e9\u5e94\u7528\u4e8e\u8fde\u7eed\u7684\u6587\u672c\u538b\u7f29\u53ca\u56fe\u50cf\u538b\u7f29\u3002\u5728 2014 \u5e74\uff0c\u7b2c\u4e00\u4e2a\u5f00\u6e90\u5728 GitHub \u7684 RoaringBitmap \u8bde\u751f[6]<\/sup>\uff0c2016\u5e74\uff0c\u5728 RoaringBitMap \u7684\u57fa\u7840\u4e0a\u589e\u52a0\u4e86\u5bf9\u4e8e\u81ea\u589e\u5e8f\u5217\u7684 RLE \u5b9e\u73b0[7]<\/sup>\uff0c\u5e76\u5e94\u7528\u5728 bitmap \u8fd9\u4e00\u573a\u666f\u4e0a\u3002<\/p>\n
                    \u5728 bitmap \u8fd9\u4e00\u573a\u666f\u4e4b\u4e0b\uff0c\u4e3b\u8981\u901a\u8fc7\u538b\u7f29\u8fde\u7eed\u533a\u95f4\u7684\u7a20\u5bc6\u6570\u636e\uff0c\u8282\u7701\u5185\u5b58\u5f00\u9500\u3002\u4ee5\u6570\u7ec4 [1, 2, 3, …, 59, 60, 89, 90, 91, …, 99, 100] \u4e3a\u4f8b\uff08\u5982\u4e0b\u56fe\u4e0a\u534a\u90e8\u5206\uff09\uff1a\u4f7f\u7528 RLE \u7f16\u7801\u4e4b\u540e\u5c31\u53d8\u4e3a [1, 60, 89, 12]\u2014\u2014\u5f62\u5982 [start1, length1, start2, length2, …] \u7684\u5f62\u5f0f\uff0c\u5176\u4e2d\u7b2c\u4e00\u4f4d\u4e3a\u8fde\u7eed\u6570\u5b57\u7684\u8d77\u59cb\u503c\uff0c\u7b2c\u4e8c\u4f4d\u4e3a\u5176\u957f\u5ea6\u3002<\/p>\n
                    \u5728\u6570\u7ec4\u5b8c\u5168\u8fde\u7eed\u573a\u666f\u4e0b\u4e2d\uff0c\u5bf9 32768 \u4e2a id (short) \u8fdb\u884c\u5b58\u50a8\uff0c\u6570\u7ec4\u5b58\u50a8\u9700\u8981 64 kB\uff0cBitmap \u5b58\u50a8\u9700\u8981\u4f7f\u7528 4 kB\uff0c\u800c RLE \u7f16\u7801\u540e\u76f4\u63a5\u5b58\u50a8\u4ec5\u9700\u8981 4 byte\u3002\u5728\u8fd9\u4e00\u7279\u6027\u4e0b\uff0c\u5982\u679c\u5546\u5bb6\u5012\u6392\u94fe\u5b8c\u5168\u6709\u5e8f\uff0c\u90a3\u4e48\u5546\u5bb6\u7684\u5012\u6392\u94fe\uff0c\u53ef\u88ab\u538b\u7f29\u5230\u6700\u4f4e\u4ec5\u9700\u8981\u4e24\u4e2a\u6574\u6570\u5373\u53ef\u8868\u793a\u3002<\/p>\n
                    \u5f53\u7136 RLE \u5e76\u4e0d\u9002\u7528\u6240\u6709\u60c5\u51b5\uff0c\u5728\u76ee\u6807\u5e8f\u5217\u5b8c\u5168\u4e0d\u8fde\u7eed\u7684\u573a\u666f\u4e0b\uff0c\u5982 [1, 3, 5, 7, … , M]\uff0cRLE \u7f16\u7801\u5b58\u50a8\u9700\u8981\u4f7f\u7528 2 * M byte\u7684\u7a7a\u95f4\uff0c\u6bd4\u6570\u7ec4\u76f4\u63a5\u5b58\u50a8\u7684\u7a7a\u95f4\u6548\u7387\u5dee\u4e00\u500d\u3002<\/p>\n
                    \u4e3a\u4e86\u548c Elasticsearch \u7684\u5b9e\u73b0\u4fdd\u6301\u4e00\u81f4\uff0c\u6211\u4eec\u51b3\u5b9a\u4f7f\u7528 RoaringBitMap \u4f5c\u4e3a\u5012\u6392\u5b58\u50a8\u7684\u7ed3\u6784\uff0c\u4ee5\u53ca\u4e2d\u95f4\u7ed3\u679c\u5408\u5e76\u7684\u6570\u636e\u7ed3\u6784\u3002\u9488\u5bf9 RoaringDocIdSet \u6211\u4eec\u8fdb\u884c\u4e86\u5982\u4e0b\u6539\u9020\u3002<\/p>\n
                    \"\u56fe5<\/p>\n
                    4.3.2 RLE Container \u7684\u5b9e\u73b0<\/h4>\n
                    \u5728\u5bf9\u5546\u5bb6 ID \u5b57\u6bb5\u5f00\u542f Index Sorting \u4e4b\u540e\uff0c\u540c\u5546\u5bb6\u7684\u5546\u54c1 ID \u5df2\u7ecf\u8fde\u7eed\u5206\u5e03\u3002\u90a3\u4e48\u5bf9\u4e8e\u5546\u5bb6\u5b57\u6bb5\u7684\u5012\u6392\u94fe\u5c31\u662f\u4e25\u683c\u81ea\u589e\u4e14\u65e0\u7a7a\u6d1e\u7684\u6574\u6570\u5e8f\u5217\u3002\u6211\u4eec\u91c7\u7528RLE\u7f16\u7801\u5bf9\u5012\u6392\u94fe\u8fdb\u884c\u7f16\u7801\u5b58\u50a8\u3002\u7531\u4e8e\u5c06\u5012\u6392\u94fe\u7f16\u7801\u4e3a [start1, length1, start2, length2, …]\uff0c\u66f4\u7279\u6b8a\u7684\uff0c\u5728\u6211\u4eec\u573a\u666f\u4e0b\uff0c\u4e00\u4e2a\u5012\u6392\u94fe\u7684\u8868\u793a\u4e3a  [start, length]\uff0cRLE\u7f16\u7801\u505a\u5230\u4e86\u5bf9\u5012\u6392\u94fe\u7684\u6781\u81f4\u538b\u7f29\uff0c\u5047\u8bbe\u5012\u6392\u94fe\u4e3a [1, 2, …., 1000]\uff0c \u7528 ArrayContainer \u5b58\u50a8\uff0c\u5185\u5b58\u7a7a\u95f4\u5360\u7528\u4e3a 16 bit  100 = 200 Byte, RLE \u7f16\u7801\u5b58\u50a8\u53ea\u9700\u8981 16 bit <\/em> 2 = 4 Byte\u3002\u8003\u8651\u5230\u5177\u4f53\u7684\u573a\u666f\u5206\u5e03\uff0c\u4ee5\u53ca\u5176\u4ed6\u573a\u666f\u53ef\u80fd\u5b58\u5728\u591a\u6bb5\u6709\u5e8f\u5012\u6392\u7684\u60c5\u51b5\uff0c\u6211\u4eec\u6700\u7ec8\u9009\u62e9\u4e86 [start1, length1, start2, length2, …] \u8fd9\u6837\u7684\u5b58\u50a8\u683c\u5f0f\uff0c\u4e14 [start,  start + length] \u4e4b\u95f4\u4e24\u4e24\u4e92\u4e0d\u91cd\u53e0\u3002<\/p>\n
                    \u5bf9\u4e8e\u591a\u4e2a\u5546\u5bb6\u7684\u5012\u6392\u5408\u5e76\u6d41\u7a0b\uff0c\u5bf9\u4e8e\u8be5\u683c\u5f0f\u7684\u5408\u5e76\uff0c\u6211\u4eec\u5e76\u4e0d\u9700\u8981\u5bf9 M \u4e2a\u5012\u6392\u94fe\u957f\u5ea6\u4e3a K \u8fdb\u884c\u5faa\u73af\u5904\u7406\uff0c\u8fd9\u4e2a\u95ee\u9898\u8f6c\u53d8\u4e3a\uff1a\u5982\u4f55\u5bf9\u591a\u7ec4\u5206\u6bb5 [start, length] \u8fdb\u884c\u6392\u5e8f\uff0c\u5e76\u5c06\u6392\u5e8f\u540e\u7684\u7ed3\u679c\u5408\u5e76\u4e3a\u4e00\u4e2a\u6570\u7ec4\u3002\u90a3\u4e48\u6211\u4eec\u5c06\u539f\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a $O(K * M + log(K * M))$ \u7684\u5408\u5e76\u6d41\u7a0b\uff0c\u6539\u9020\u4e3a\u590d\u6742\u5ea6\u4e3a O(M * logM) \u7684\u5408\u5e76\u6d41\u7a0b\uff0c\u5927\u5927\u964d\u4f4e\u4e86\u5408\u5e76\u7684\u8ba1\u7b97\u8017\u65f6\uff0c\u51cf\u5c11\u4e86 CPU \u7684\u6d88\u8017\u3002<\/p>\n
                    4.3.3 SparseRoaringDocIdSet \u5b9e\u73b0<\/h4>\n
                    \u6211\u4eec\u5728 RoaringDocIdSet \u7684\u57fa\u7840\u4e0a\u589e\u52a0\u4e86 RLE Container \u540e\uff0c\u6027\u80fd\u5df2\u7ecf\u5f97\u5230\u4e86\u660e\u663e\u7684\u63d0\u5347\uff0c\u52a0\u901f\u4e86 50%\uff0c\u7136\u800c\u4f9d\u7136\u4e0d\u7b26\u5408\u6211\u4eec\u7684\u9884\u671f\u3002\u6211\u4eec\u901a\u8fc7\u5bf9\u5012\u6392\u94fe\u7684\u6570\u636e\u5206\u6790\u53d1\u73b0\uff1a\u5012\u6392\u94fe\u7684\u5e73\u5747\u957f\u5ea6\u4e0d\u5927\uff0c\u57fa\u672c\u5728\u5341\u4e07\u5185\u3002\u4f46\u662f\u5176\u53d6\u503c\u8303\u56f4\u5e7f [ 0, Integer.MAX-1 ]\u3002\u8fd9\u4e9b\u7279\u5f81\u8bf4\u660e\uff0c\u5982\u679c\u4ee5 RoaringDocIdSet \u6309\u9ad8 16 \u4f4d\u8fdb\u884c\u5206\u6876\u7684\u8bdd\uff0c\u5927\u90e8\u5206\u6570\u636e\u5c06\u96c6\u4e2d\u5728\u5176\u4e2d\u8fde\u7eed\u7684\u51e0\u4e2a\u6876\u4e2d\u3002<\/p>\n
                    \u5728 Elasticsearch \u573a\u666f\u4e0a\uff0c\u7531\u4e8e\u65e0\u6cd5\u9884\u4f30\u6570\u636e\u5206\u5e03\uff0cRoaringDocIdSet \u5728\u7533\u8bf7 bucket \u5bb9\u5668\u7684\u6570\u7ec4\u65f6\uff0c\u4f1a\u6839\u636e\u5f53\u524d Segment \u4e2d\u7684\u6700\u5927 Doc ID \u6765\u7533\u8bf7\uff0c\u8ba1\u7b97\u516c\u5f0f\u4e3a\uff1a(maxDoc + (1 << 16) –  1) >>> 16\u3002\u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u907f\u514d\u6bcf\u6b21\u5747\u6309\u7167 Integer.MAX-1 \u6765\u521b\u5efa\u5bb9\u5668\u5e26\u6765\u7684\u65e0\u8c13\u5f00\u9500\u3002\u7136\u800c\uff0c\u5f53\u5012\u6392\u94fe\u6570\u91cf\u504f\u5c11\u4e14\u5206\u5e03\u96c6\u4e2d\u65f6\uff0c\u8fd9\u79cd\u65b9\u5f0f\u4f9d\u7136\u65e0\u6cd5\u907f\u514d\u5927\u91cf bucket \u88ab\u7a7a\u7f6e\u7684\u7a7a\u95f4\u6d6a\u8d39\uff1b\u53e6\u4e00\u65b9\u9762\uff0c\u5728\u5bf9\u5012\u6392\u94fe\u8fdb\u884c\u5408\u5e76\u65f6\uff0c\u8fd9\u4e9b\u7a7a\u7f6e\u7684 bucket \u4e5f\u4f1a\u53c2\u4e0e\u5230\u904d\u5386\u4e2d\uff0c\u5373\u4f7f\u5b83\u88ab\u7f6e\u4e3a\u4e86\u7a7a\u3002\u8fd9\u5c31\u53c8\u9020\u6210\u4e86\u6027\u80fd\u4e0a\u7684\u6d6a\u8d39\u3002\u6211\u4eec\u901a\u8fc7\u538b\u6d4b\u8bc4\u4f30\u8bc1\u5b9e\u4e86\u8fd9\u4e00\u63a8\u7406\uff0c\u5373\u7a7a\u7f6e\u7684 bucket \u5728\u5408\u5e76\u65f6\u4e5f\u4f1a\u5360\u7528\u5927\u91cf\u7684 CPU \u8d44\u6e90\u3002<\/p>\n
                    \u9488\u5bf9\u8fd9\u4e00\u95ee\u9898\uff0c\u6211\u4eec\u8bbe\u8ba1\u4e86\u4e00\u5957\u7528\u4e8e\u7a00\u758f\u6570\u636e\u7684\u65b9\u6848\uff0c\u5b9e\u73b0\u4e86 SparseRoaringDocIdSet\uff0c\u540c\u65f6\u4fdd\u6301\u63a5\u53e3\u4e0e RoaringDocIdSet \u4e00\u81f4\uff0c\u53ef\u5728\u5404\u573a\u666f\u4e0b\u8fdb\u884c\u590d\u7528\uff0c\u5176\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n
                    class SparseRoaringDocIdSet {\n   int[] index;                            \/\/ \u8bb0\u5f55\u6709 container \u7684 bucket Index\n   Container[] denseSets;        \/\/ \u8bb0\u5f55\u7d27\u5bc6\u6392\u5217\u7684\u5012\u6392\u94fe\n}<\/code><\/pre>\n
                    \u4fdd\u5b58\u5012\u6392\u94fe\u7684\u8fc7\u7a0b\u4e0e RoaringDocIDSet \u4fdd\u6301\u4e00\u81f4\uff0c\u5728\u786e\u8ba4\u5177\u4f53\u7684 Container \u7684\u5206\u6876\u65f6\uff0c\u6211\u4eec\u989d\u5916\u4f7f\u7528\u4e00\u7ec4\u7d22\u5f15\u8bb0\u5f55\u6240\u6709\u6709\u503c\u7684 bucket \u7684 location\u3002<\/p>\n
                    \u4e0b\u56fe\u662f\u4e00\u7ec4\u5206\u522b\u4f7f\u7528 RLE based RoaringDocIdSet \u548c SparseRoaringDocIdSet \u5bf9 [846710, 100, 936858, 110] \u5012\u6392\u94fe\uff08RLE \u7f16\u7801\uff09\u8fdb\u884c\u5b58\u50a8\u7684\u793a\u610f\u56fe\uff1a<\/p>\n
                    \"\u56fe6<\/p>\n
                    \u53ef\u4ee5\u770b\u5230\uff1a\u5728 SparseRoaringDocIdSet \u5b9e\u73b0\u4e0b\uff0c\u6240\u6709\u4e0d\u4e3a\u7a7a\u7684 bucket \u88ab\u7d27\u5bc6\u7684\u6392\u5217\u5728\u4e86\u4e00\u8d77\uff0c\u5e76\u5728 index [] \u4e2d\u8bb0\u5f55\u4e86\u5176\u539f\u59cb bucket \u7684\u7d22\u5f15\uff0c\u8fd9\u5c31\u907f\u514d\u4e86\u5927\u91cf bucket \u88ab\u7a7a\u7f6e\u7684\u60c5\u51b5\u3002\u53e6\u5916\uff0c\u5728\u8fdb\u884c\u5012\u6392\u94fe\u7684\u5408\u5e76\u65f6\uff0c\u5c31\u53ef\u4ee5\u76f4\u63a5\u5bf9\u7d27\u5bc6\u6392\u5217\u7684 denseSet \u8fdb\u884c\u904d\u5386\uff0c\u5e76\u4ece index [] \u83b7\u5f97\u5176\u5bf9\u5e94\u7684\u539f\u59cb bucket location\uff0c\u8fd9\u5c31\u907f\u514d\u4e86\u5927\u91cf\u7684\u7a7a\u7f6e bucket \u5728\u5408\u5e76\u65f6\u5e26\u6765\u7684\u6027\u80fd\u6d6a\u8d39\u3002<\/p>\n
                    \u6211\u4eec\u5206\u522b\u5bf9\u4ee5\u4e0b4\u4e2a\u573a\u666f\u8fdb\u884c\u4e86\u538b\u6d4b\uff1a\u539f\u751f\u7684 TermInSetQuery \u5bf9\u5012\u6392\u94fe\u7684\u5408\u5e76\u903b\u8f91\u3001\u57fa\u4e8e FixedBitSet \u7684\u6279\u91cf\u5408\u5e76\u3001RLE based  RoaringBitmap\u3001RLE based Dense RoaringBitmap\u3002\u5bf9 10000 \u4e2a\u5e73\u5747\u957f\u5ea6\u4e3a 100 \u7684\u5012\u6392\u94fe\u8fdb\u884c\u5408\u5e76\u538b\u6d4b\uff0c\u538b\u6d4b\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n
                    \"\u56fe7<\/p>\n
                    \u6211\u4eec\u5b9e\u73b0\u7684 RLE based Dense RoaringBitmap\uff0c\u76f8\u6bd4\u5b98\u65b9\u7684\u57fa\u51c6\u5b9e\u73b0\u8017\u65f6\u964d\u4f4e\u4e86 96%\uff08TP99 13 ms \u4e0b\u964d\u81f3 0.5 ms\uff09\u3002<\/p>\n
                    4.4 \u529f\u80fd\u96c6\u6210<\/h3>\n
                    \u81f3\u6b64\uff0c\u6838\u5fc3\u7684\u5012\u6392\u7d22\u5f15\u95ee\u9898\u5df2\u7ecf\u89e3\u51b3\uff0c\u540e\u7eed\u4e3b\u8981\u4e3a\u5de5\u7a0b\u95ee\u9898\uff1a\u5982\u4f55\u5728 Elasticsearch \u7cfb\u7edf\u4e2d\u96c6\u6210\u57fa\u4e8e RLE \u7684\u5012\u6392\u683c\u5f0f\u3002\u5bf9\u4e8e\u9ad8\u541e\u5410\u9ad8\u5e76\u53d1\u7684C\u7aef\u5728\u7ebf\u573a\u666f\uff0c\u6211\u4eec\u5e0c\u671b\u5c3d\u53ef\u80fd\u4fdd\u969c\u7ebf\u4e0a\u7684\u7a33\u5b9a\uff0c\u5bf9\u5f00\u6e90\u6570\u636e\u683c\u5f0f\u7684\u517c\u5bb9\uff0c\u4fdd\u969c\u524d\u5411\u7684\u517c\u5bb9\uff0c\u505a\u5230\u968f\u65f6\u53ef\u964d\u7ea7\u3002<\/p>\n
                    \u5de5\u7a0b\u90e8\u5206\u4e3b\u8981\u5206\u4e3a\u4e24\u90e8\u5206\uff1a\u5012\u6392\u7d22\u5f15\u7684\u96c6\u6210\u548c\u5728\u7ebf\u68c0\u7d22\u94fe\u8def\u3002\u4ee5\u4e0b\u4e3b\u8981\u4ecb\u7ecd\u5168\u91cf\u7d22\u5f15\u90e8\u5206\u7684\u94fe\u8def\u8bbe\u8ba1\u3002<\/p>\n
                    4.4.1 \u5012\u6392\u7d22\u5f15\u96c6\u6210<\/h4>\n
                    \u5012\u6392\u7d22\u5f15\u683c\u5f0f\u7684\u6539\u9020\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u9700\u8981\u5b9e\u73b0\u4e00\u5957 PostingsFormat\uff0c\u5e76\u5b9e\u73b0\u5bf9\u5e94\u7684 Reader\u3001Writer\u3002\u4e3a\u4e86\u4fdd\u8bc1\u5bf9\u539f\u6709\u68c0\u7d22\u8bed\u53e5\u7684\u517c\u5bb9\uff0c\u652f\u6301\u591a\u79cd\u573a\u666f\u7684\u68c0\u7d22\uff0c\u4ee5\u53ca\u4e3a\u4e86\u672a\u6765\u80fd\u591f\u65e0\u7f1d\u7684\u914d\u5408 Elasticsearch \u7684\u7248\u672c\u5347\u7ea7\uff0c\u6211\u4eec\u5e76\u6ca1\u6709\u9009\u62e9\u76f4\u63a5\u5b9e\u73b0\u4e00\u7ec4\u65b0\u7684 PostingsFormat\uff0c\u907f\u514d\u51fa\u73b0\u4e0d\u517c\u5bb9\u7684\u60c5\u51b5\u5bfc\u81f4\u65e0\u6cd5\u5347\u7ea7\u7248\u672c\u3002\u6211\u4eec\u9009\u62e9\u4e86\u57fa\u4e8e\u73b0\u6709\u7684\u5012\u6392\u683c\u5f0f\uff0c\u5728\u670d\u52a1\u52a0\u8f7d\u524d\u540e\u521d\u59cb\u5316 RLE \u5012\u6392\uff0c\u5e76\u8003\u8651\u5230\u4e1a\u52a1\u573a\u666f\uff0c\u6211\u4eec\u51b3\u5b9a\u5c06 RLE \u5012\u6392\u5168\u91cf\u653e\u5165\u5185\u5b58\u4e2d\uff0c\u4ee5\u8fbe\u5230\u6781\u81f4\u7684\u6027\u80fd\u3002\u5177\u4f53\u7684\u89e3\u51b3\u65b9\u6848\u4e3a\uff1a<\/p>\n
                      \n
                    1. \u7d22\u5f15\u52a0\u8f7d\u8fc7\u7a0b\u4e2d\u589e\u52a0\u4e00\u7ec4 Hook\uff0c\u7528\u4e8e\u83b7\u53d6\u73b0\u6709\u7684 InternalEngine\uff08 Elasticsearch\u4e2d\u8d1f\u8d23\u7d22\u5f15\u589e\u5220\u6539\u67e5\u7684\u4e3b\u8981\u5bf9\u8c61 \uff09\u3002<\/li>\n
                    2. \u5bf9\u6240\u6709\u7684 semgents \u904d\u5386\u8bfb\u53d6\u6570\u636e\uff0c\u89e3\u6790\u5012\u6392\u6570\u636e\u3002<\/li>\n
                    3. \u5bf9\u6240\u6709\u914d\u7f6e\u4e86 RLE \u5012\u6392\u4f18\u5316\u7684\u5b57\u6bb5\uff0c\u751f\u6210 RLE \u5012\u6392\u8868\u3002<\/li>\n
                    4. \u5c06 RLE \u5012\u6392\u8868\u4e0e segment \u505a\u5173\u8054\uff0c\u4fdd\u8bc1\u540e\u7eed\u7684\u68c0\u7d22\u94fe\u8def\u4e2d\u80fd\u83b7\u53d6\u5230\u5012\u6392\u8868\u3002<\/li>\n<\/ol>\n
                      \u4e3a\u4e86\u907f\u514d\u5185\u5b58\u6cc4\u6f0f\uff0c\u6211\u4eec\u4e5f\u5c06\u7d22\u5f15\u5220\u9664\uff0csegment \u53d8\u66f4\u7684\u573a\u666f\u8fdb\u884c\u4e86\u76f8\u5e94\u7684\u5904\u7406\u3002<\/p>\n
                      4.4.2 \u5728\u7ebf\u68c0\u7d22\u94fe\u8def<\/h4>\n
                      \u5728\u7ebf\u68c0\u7d22\u94fe\u8def\u4e5f\u91c7\u7528\u4e86\u65e0\u4fb5\u5165\u517c\u5bb9\u7684\u5b9e\u73b0\uff0c\u6211\u4eec\u5b9e\u73b0\u4e86\u4e00\u5957\u65b0\u7684\u68c0\u7d22\u8bed\u53e5\uff0c\u5e76\u4e14\u5728\u7d22\u5f15\u65e0 RLE \u5012\u6392\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u964d\u7ea7\u56de\u539f\u751f\u7684\u68c0\u7d22\u7c7b\u578b\uff0c\u66f4\u52a0\u5b89\u5168\u3002<\/p>\n
                      \u6211\u4eec\u57fa\u4e8e Elasticsearch \u7684\u63d2\u4ef6\u673a\u5236\uff0c\u751f\u6210\u4e00\u7ec4\u65b0\u7684 Query\uff0c\u5b9e\u73b0\u4e86\u5176 AbstractQueryBuilder\uff0c\u5b9e\u73b0\u5bf9 Query \u7684\u89e3\u6790\u4e0e\u6539\u5199\uff0c\u5e76\u5c06 Query \u4e0e RLE \u5012\u6392\u8fdb\u884c\u5173\u8054\uff0c\u6211\u4eec\u901a\u8fc7\u6539\u5199\u5177\u4f53\u7684\u68c0\u7d22\u5b9e\u73b0\uff0c\u5c06\u6574\u4e2a\u94fe\u8def\u96c6\u6210\u5230 Elasticsearch \u4e2d\u3002<\/p>\n
                      5. \u6027\u80fd\u6536\u76ca<\/h2>\n
                      \u5bf9\u4e8e Elasticsearch \u800c\u8a00\uff0c\u4e00\u6b21\u68c0\u7d22\u5206\u4e3a\u8fd9\u4e48\u51e0\u4e2a\u9636\u6bb5\uff0c\u53ef\u53c2\u8003\u4e0b\u56fe[8]<\/sup>\u3002<\/p>\n
                      \"\u56fe8<\/p>\n
                        \n
                      1. \u7531\u534f\u8c03\u8282\u70b9\u8fdb\u884c\u8bf7\u6c42\u7684\u5206\u53d1\uff0c\u53d1\u9001\u5230\u5404\u4e2a\u68c0\u7d22\u8282\u70b9\u4e0a\u3002<\/li>\n
                      2. \u6bcf\u4e2a\u6570\u636e\u8282\u70b9\u7684\u5404\u81ea\u8fdb\u884c\u68c0\u7d22\uff0c\u5e76\u8fd4\u56de\u68c0\u7d22\u7ed3\u679c\u7ed9\u534f\u8c03\u8282\u70b9\uff0c\u8fd9\u4e00\u6bb5\u5404\u4e2a\u6570\u636e\u8282\u70b9\u7684\u8017\u65f6\u5373\u201c\u6570\u636e\u8282\u70b9\u67e5\u8be2\u8017\u65f6\u201d\u3002<\/li>\n
                      3. \u534f\u8c03\u8282\u70b9\u7b49\u5f85\u6240\u6709\u6570\u636e\u8282\u70b9\u7684\u8fd4\u56de\uff0c\u534f\u8c03\u8282\u70b9\u9009\u53d6 Top K \u540e\u8fdb\u884c fetch \u64cd\u4f5c\u30021\uff5e3 \u6b65\u7684\u5b8c\u6574\u8017\u65f6\u4e3a\u201c\u5b8c\u6574\u94fe\u8def\u67e5\u8be2\u8017\u65f6\u201d\u3002<\/li>\n<\/ol>\n
                        \u6211\u4eec\u5c06\u4e0a\u8ff0\u6539\u52a8\uff08Index Sorting + Dense Roaring Bitmap + RLE\uff09\u4e0a\u7ebf\u5230\u751f\u4ea7\u73af\u5883\u7684\u5546\u54c1\u7d22\u5f15\u540e\uff0c\u6027\u80fd\u5982\u4e0b\uff1a<\/p>\n
                        \"\u56fe9<\/p>\n
                        \"\u56fe10<\/p>\n
                        \u81f3\u6b64\uff0c\u6211\u4eec\u6210\u529f\u5c06\u5168\u94fe\u8def\u7684\u68c0\u7d22\u65f6\u5ef6\uff08TP99\uff09\u964d\u4f4e\u4e86 84%\uff08100 ms \u4e0b\u964d\u81f3 16 ms\uff09\uff0c\u89e3\u51b3\u4e86\u5916\u5356\u641c\u7d22\u7684\u68c0\u7d22\u8017\u65f6\u95ee\u9898\uff0c\u5e76\u4e14\u7ebf\u4e0a\u670d\u52a1\u7684 CPU \u4e5f\u5927\u5927\u964d\u4f4e\u3002<\/p>\n
                        6. \u603b\u7ed3\u4e0e\u5c55\u671b<\/h2>\n
                        \u672c\u6587\u4e3b\u8981\u9488\u5bf9\u641c\u7d22\u4e1a\u52a1\u573a\u666f\u4e2d\u9047\u5230\u7684\u95ee\u9898\uff0c\u8fdb\u884c\u95ee\u9898\u5206\u6790\u3001\u6280\u672f\u9009\u578b\u3001\u538b\u6d4b\u3001\u9009\u62e9\u5408\u9002\u7684\u89e3\u51b3\u65b9\u6848\u3001\u96c6\u6210\u3001\u7070\u5ea6\u9a8c\u8bc1\u3002\u6211\u4eec\u6700\u7ec8\u5b9e\u73b0\u4e86\u4e00\u5957\u57fa\u4e8e RLE \u5012\u6392\u683c\u5f0f\uff0c\u4f5c\u4e3a\u4e00\u79cd\u65b0\u578b\u7684\u5012\u6392\u683c\u5f0f\uff0c\u5f7b\u5e95\u89e3\u51b3\u4e86\u8fd9\u4e2a\u573a\u666f\u4e0a\u7684\u6027\u80fd\u74f6\u9888\uff0c\u4ece\u5206\u6790\u81f3\u4e0a\u7ebf\u7684\u6d41\u7a0b\u957f\u8fbe\u6570\u6708\u3002\u672c\u6587\u5e0c\u671b\u80fd\u63d0\u4f9b\u4e00\u4e2a\u601d\u8def\uff0c\u8ba9\u5176\u4ed6\u540c\u5b66\u5728\u9047\u5230 Elasticsearch \u76f8\u5173\u7684\u6027\u80fd\u95ee\u9898\u65f6\uff0c\u4e5f\u80fd\u9075\u5faa\u76f8\u540c\u7684\u8def\u5f84\uff0c\u89e3\u51b3\u4e1a\u52a1\u4e0a\u7684\u95ee\u9898\u3002<\/p>\n
                        \u4e00\u822c\u7684\uff0c\u6211\u4eec\u5206\u6790\u95ee\u9898\u53ef\u4ee5\u9075\u5faa\u8fd9\u6837\u7684\u8def\u5f84\uff1a<\/p>\n
                          \n
                        1. \u660e\u786e\u6027\u80fd\u95ee\u9898\u540e\uff0c\u9996\u5148\u901a\u8fc7\u6d41\u91cf\u5f55\u5236\uff0c\u83b7\u5f97\u4e00\u4e2a\u7528\u4e8e\u540e\u7eed\u57fa\u51c6\u538b\u6d4b\u7684\u6d4b\u8bd5\u96c6\u5408\u3002<\/li>\n
                        2. \u901a\u8fc7\u76f8\u5173\u7684\u6027\u80fd\u5206\u6790\u5de5\u5177\uff0c\u5148\u660e\u786e\u662f\u5426\u5b58\u5728 CPU \u7684\u70ed\u70b9\u6216 IO \u95ee\u9898\uff0c\u5bf9\u4e8e Java \u6280\u672f\u6808\uff0c\u6709\u5f88\u591a\u5e38\u89c1\u7684\u53ef\u7528\u4e8e\u5206\u6790\u6027\u80fd\u7684\u5de5\u5177\uff0c\u7f8e\u56e2\u5185\u90e8\u6709 Scaple \u5206\u6790\u5de5\u5177\uff0c\u5916\u90e8\u53ef\u4ee5\u4f7f\u7528 JProfiler\u3001Java Flight Recorder\u3001Async Profiler\u3001Arthas\u3001perf \u8fd9\u4e9b\u5de5\u5177\u3002<\/li>\n
                        3. \u5bf9\u5206\u6790\u706b\u7130\u56fe\u8fdb\u884c\u5206\u6790\uff0c\u914d\u5408\u6e90\u4ee3\u7801\uff0c\u8fdb\u884c\u6570\u636e\u5206\u6790\u548c\u9a8c\u8bc1\u3002<\/li>\n
                        4. \u6b64\u5916\u5728 Elasticsearch \u4e2d\u8fd8\u53ef\u4ee5\u901a\u8fc7 Kibana \u7684 Search Profiler \u7528\u4e8e\u534f\u52a9\u5b9a\u4f4d\u95ee\u9898\u3002\u5728\u5f55\u5236\u5927\u91cf\u7684\u6d41\u91cf\uff0c\u62bd\u6837\u5206\u6790\u540e\uff0c\u4ee5\u6211\u4eec\u7684\u573a\u666f\u4e3a\u4f8b\uff0c\u8fdb\u884c Profiler \u540e\u53ef\u4ee5\u660e\u786e TermInSetQuery \u5360\u7528\u4e86\u4e00\u534a\u4ee5\u4e0a\u7684\u8017\u65f6\u3002<\/li>\n
                        5. \u660e\u786e\u95ee\u9898\u540e\u4ece\u7d22\u5f15\u3001\u68c0\u7d22\u94fe\u8def\u4e24\u4fa7\u8fdb\u884c\u5206\u6790\uff0c\u8bc4\u4f30\u95ee\u9898\uff0c\u8fdb\u884c\u591a\u79cd\u89e3\u51b3\u65b9\u6848\u7684\u8bbe\u8ba1\u4e0e\u5c1d\u8bd5\uff0c\u901a\u8fc7 Java Microbenchmark Harness\uff08JMH\uff09\u4ee3\u7801\u57fa\u51c6\u6d4b\u8bd5\u5de5\u5177\uff0c\u9a8c\u8bc1\u89e3\u51b3\u65b9\u6848\u7684\u6709\u6548\u6027\u3002<\/li>\n
                        6. \u96c6\u6210\u9a8c\u8bc1\u6700\u7ec8\u6548\u679c\u3002<\/li>\n<\/ol>\n
                          \"\u56fe11<\/p>\n
                          \u6211\u4eec\u6700\u7ec8\u5b9e\u73b0\u7684\u5173\u952e\u70b9\uff1a<\/p>\n