{"id":3502,"date":"2024-02-07T22:20:02","date_gmt":"2024-02-07T14:20:02","guid":{"rendered":"http:\/\/www.dama.org.cn\/wordpress\/?p=3502"},"modified":"2024-02-07T22:20:02","modified_gmt":"2024-02-07T14:20:02","slug":"%e6%9d%8e%e6%9c%ac%e5%88%a9-%e6%b7%b1%e5%85%a5%e6%b5%85%e5%87%ba%e5%bf%ab%e6%89%8b%e5%9b%be%e6%95%b0%e6%8d%ae%e5%ba%93%ef%bc%9a%e7%9c%8b%e6%9e%b6%e6%9e%84%e5%a6%82%e4%bd%95%e8%ae%a9%e6%8e%a8","status":"publish","type":"post","link":"https:\/\/www.dama.org.cn\/wordpress\/2024\/02\/07\/%e6%9d%8e%e6%9c%ac%e5%88%a9-%e6%b7%b1%e5%85%a5%e6%b5%85%e5%87%ba%e5%bf%ab%e6%89%8b%e5%9b%be%e6%95%b0%e6%8d%ae%e5%ba%93%ef%bc%9a%e7%9c%8b%e6%9e%b6%e6%9e%84%e5%a6%82%e4%bd%95%e8%ae%a9%e6%8e%a8\/","title":{"rendered":"\u674e\u672c\u5229 | \u6df1\u5165\u6d45\u51fa\u5feb\u624b\u56fe\u6570\u636e\u5e93\uff1a\u770b\u67b6\u6784\u5982\u4f55\u8ba9\u63a8\u8350\u53ec\u56de\u66f4\u9ad8\u6548"},"content":{"rendered":"\n

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1. \u5e94\u7528\u573a\u666f<\/p>\n\n\n\n

2. \u6838\u5fc3\u8bc9\u6c42<\/p>\n\n\n\n

3. \u5b58\u7b97\u5206\u79bb\u67b6\u6784<\/p>\n\n\n\n

4. \u6027\u80fd\u8981\u70b9<\/p>\n\n\n\n

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\"\"<\/figure>\n\n\n\n

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\"\"<\/figure>\n\n\n\n

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2.\u00a0<\/strong>\u4e09\u89d2\u95ee\u9898-\u5171\u540c<\/strong><\/p>\n\n\n\n

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\"\"<\/figure>\n\n\n\n

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\"\"<\/figure>\n\n\n\n

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3. <\/strong>\u5b58\u5728\u95ee\u9898<\/strong><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

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\"\"<\/figure>\n\n\n\n

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02<\/strong> \u6838\u5fc3\u8bc9\u6c42<\/strong><\/p>\n\n\n\n

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    \n
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    03<\/strong> \u5b58\u7b97\u5206\u79bb\u67b6\u6784<\/strong><\/p>\n\n\n\n

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    \"\"<\/figure>\n\n\n\n

    \u5feb\u624b\u5f53\u524d\u7684\u67b6\u6784\u4e3b\u8981\u662f\u5206\u4e3a Graph Service \u5c42\u3001Tree Service \u5c42\u548c Storage \u5c42\u3002<\/p>\n\n\n\n

    Graph Service \u5c42\u5c31\u662f\u8bed\u6cd5\u7684\u6267\u884c\u5c42\u3002<\/p>\n\n\n\n

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    2.\u00a0<\/strong>BWTree Service<\/strong><\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    BWTree Service \u662f\u5185\u5b58\u5c42\uff0c\u662f\u56fe\u63cf\u8ff0\u7684\u4e00\u5c42\uff0c\u5bf9\u5176\u6700\u4e3b\u8981\u7684\u8bc9\u6c42\u5c31\u662f\u5f3a\u4e00\u81f4\u3002\u56e0\u4e3a\u56fe\u7684\u6a21\u578b\u6709\u4e00\u4e9b\u5176\u4ed6\u884d\u751f\u51fa\u6765\u7684\u6570\u636e\u7ed3\u6784\uff0c\u6bd4\u5982\u552f\u4e00\u6027\u7d22\u5f15\uff0c\u7269\u5316\u51fa\u6765\u7684 num neighbors\u3001\u53cc\u5173\u7b49\uff0c\u5982\u679c\u4e0d\u80fd\u505a\u5230\u5f3a\u4e00\u81f4\uff0c\u6574\u4e2a\u6a21\u578b\u4f1a\u5b58\u5728\u4e00\u4e9b\u95ee\u9898\u3002\u5b83\u4e3b\u8981\u662f\u5229\u7528 Mem \u548c SSD \u4f5c\u4e3a Cache\u3002<\/p>\n\n\n\n

    \u5148\u6765\u770b\u4e00\u4e0b\u7528\u6237\u8bf7\u6c42\u7684\u5904\u7406\u8fc7\u7a0b\uff0c\u5982\u4e0a\u56fe\u4e2d\u53f3\u4fa7\u6240\u793a\u3002\u7528\u6237\u53d1\u8d77\u4e00\u4e2a\u8bf7\u6c42\uff0c\u52a0\u5165\u5230\u8bf7\u6c42\u961f\u5217\uff0c\u7528\u6237\u6240\u6709\u8bf7\u6c42\u90fd\u5728\u4e00\u4e2a\u961f\u5217\u4e2d\u3002Tree-writer \u7ebf\u7a0b\u5de5\u4f5c\u4e2d\uff0c\u4f1a\u628a\u8fd9\u4e9b\u8bf7\u6c42\u6253\u5305\u6210\u4e00\u4e2a Log\uff0ccommit \u5230 WAL-service\uff0c\u8fd9\u662f\u5f3a\u4e00\u81f4\u6027\u5b58\u50a8\u7684\u4e00\u4e2a\u5916\u90e8\u5b58\u50a8\u5e73\u53f0\u3002commit \u6210\u529f\u5c31\u53ef\u4ee5\u5e94\u7528\u00a0 Wal-diff \u5230\u5185\u5b58\u4e2d\uff1b\u5982\u679c commit \u51b2\u7a81\uff0c\u5373 WAL-service \u5df2\u7ecf\u6709\u4e86\u8fd9\u4e2a Log\uff0c\u5c31\u8981\u628a\u6700\u65b0\u7684 Log \u62c9\u56de\u6765\u5e94\u7528\u5230\u5185\u5b58\uff0c\u518d\u91cd\u65b0\u6267\u884c\u4e0a\u8ff0\u8fc7\u7a0b\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u4fdd\u8bc1\u5f3a\u4e00\u81f4\u3002\u6700\u540e\u5c31\u662f Log \u5e94\u7528\u5230\u5185\u5b58\u4e2d\uff0c\u5e76\u8fd4\u56de\u6210\u529f\u3002\u8fd9\u91cc\u7684 flush \u540e\u53f0\u7ebf\u7a0b\uff0c\u6267\u884c\u7684\u9891\u7387\u6bd4\u8f83\u4f4e\uff0c\u5927\u6982\u662f\u51e0\u5341\u5206\u949f\u81f3\u4e00\u4e2a\u5c0f\u65f6\u624d\u4f1a\u628a\u6240\u6709\u7684\u6570\u636e flush \u4e00\u904d\uff0c\u901f\u7387\u53d6\u51b3\u4e8e\u5f53\u524d\u7684\u810f\u9875\u7387\uff0c\u5c3d\u91cf\u964d\u4f4e\u5bf9\u6301\u4e45\u5316\u5b58\u50a8\u7684\u5f71\u54cd\u3002Page \u6301\u4e45\u5316\u5b58\u50a8\u4f1a\u5206\u4e3a\u4e24\u5c42\uff0c\u4e00\u5c42\u662f SSD Cache\uff0c\u8fd8\u6709\u4e00\u5c42\u662f S3 \u5b58\u50a8\uff0c\u53ef\u4ee5\u8fdb\u4e00\u6b65\u964d\u4f4e\u6210\u672c\u3002\u6211\u4eec\u7684 Wal-service \u9664\u4e86\u521a\u624d\u63d0\u5230\u7684\u65e5\u5fd7\uff0c\u8fd8\u517c\u5177\u9009\u4e3b\u7684\u529f\u80fd\uff0c\u5373\u591a\u526f\u672c\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u9009\u4e3b\u3002<\/p>\n\n\n\n

    3.\u00a0<\/strong>\u7d27\u51d1\u5185\u5b58\u6a21\u578b<\/strong><\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    \u524d\u6587\u4e2d\u63d0\u5230\uff0c\u5185\u5b58\u662f\u6210\u672c\u7684\u4e3b\u8981\u6765\u6e90\u3002\u6211\u4eec\u7684\u5185\u5b58\u6a21\u578b\u548c\u64cd\u4f5c\u7cfb\u7edf\u662f\u6bd4\u8f83\u76f8\u4f3c\u7684\u3002\u7528 mmap \u7533\u8bf7\u5f88\u5927\u7684\u4e09\u5757\u5185\u5b58\uff0c\u5206\u522b\u4f5c\u4e3a\u4e00\/\u4e8c\/\u4e09\u7ea7\u9875\u8868\uff0c\u548c\u64cd\u4f5c\u7cfb\u7edf\u7684\u9875\u8868\u662f\u540c\u4e00\u4e2a\u6982\u5ff5\uff0c\u5728\u7d27\u51d1\u7684\u5185\u5b58\u7a7a\u95f4\u662f\u6ca1\u6709\u4efb\u4f55\u6d6a\u8d39\u7684\u3002\u7b2c\u4e09\u7ea7\u9875\u8868\uff0c\u6307\u5411\u771f\u5b9e\u7684\u6570\u636e\u3002\u6570\u636e\u662f\u7528 malloc\uff0c\u56e0\u4e3a\u6211\u4eec\u5e0c\u671b\u9875\u672c\u8eab\u662f\u53ef\u53d8\u5927\u5c0f\u7684\u3002\u5b9e\u4f8b\u5185\u5b58\u6bd4\u8f83\u6ee1\uff0c\u5c31\u8fdb\u884c\u6dd8\u6c70\uff0c\u4ece page records \u5de6\u4fa7\u5f00\u59cb\u904d\u5386\uff0c\u9047\u5230 access_num \u4e3a 0 \u7684\u9875\u5c31\u53ef\u4ee5\u6dd8\u6c70\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u4e5f\u548c\u64cd\u4f5c\u7cfb\u7edf\u6bd4\u8f83\u50cf\uff0c\u56e0\u6b64\u6211\u4eec\u4e5f\u662f\u7528\u7684 CLOCK \u6dd8\u6c70\u7b97\u6cd5\u3002<\/p>\n\n\n\n

    4.\u00a0<\/strong>\u8fb9\u6a21\u578b<\/strong><\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    \u524d\u9762\u8bb2\u89e3\u4e86\u6811\u6a21\u578b\uff0c\u4f46\u662f\u6811\u6a21\u578b\u4e0d\u80fd\u5b8c\u6574\u5730\u63cf\u8ff0\u8fb9\uff0c\u8fb9\u6709\u56db\u79cd\u6811\u7ed3\u6784\uff0c\u5206\u522b\u662f Record Tree\u3001Unique Index Tree\u3001Num Neighbors Materialize Tree \u548c Bidirectional Materialize Tree\u3002Record Tree \u662f\u8bb0\u5f55\u6811\uff0cUnique Index Tree \u662f\u7d22\u5f15\u6811\uff0c\u5173\u7cfb\u94fe\u6811\u662f\u9700\u8981\u7ef4\u62a4\u7d22\u5f15\u7684\u3002Num Neighbors Materialize Tree \u662f\u90bb\u5c45\u7684\u7269\u5316\u89c6\u56fe\uff0c\u4e3b\u8981\u8bb0\u5f55\u5728\u4e00\u70b9\u6709\u591a\u5c11\u4e2a\u90bb\u5c45\uff0c\u6709\u591a\u5c11\u4e2a\u8bc4\u8bba\u6811\uff0c\u591a\u5c11\u4e2a\u597d\u53cb\u6811\u3002\u7269\u5316\u89c6\u56fe\u7684\u66f4\u65b0\u4e3b\u8981\u662f\u4f9d\u636e\u666e\u901a\u7684\u6811\u66f4\u65b0\uff0c\u6839\u636e\u4e3b\u6811\u6765\u66f4\u65b0\u3002Bidirectional Materialize Tree \u662f\u53cc\u5173\u7269\u5316\u89c6\u56fe\uff0c\u6839\u636e\u51fa\u8fb9\u548c\u5165\u8fb9\u7269\u5316\u51fa\u4e00\u4e2a\u53cc\u5173\u5217\u8868\u3002\u4ee5\u4e0a\u56db\u79cd\u6811\u53ef\u4ee5\u6839\u636e\u7528\u6237\u914d\u7f6e\u6765\u8fdb\u884c\u751f\u6210\u6216\u4e0d\u751f\u6210\u3002<\/p>\n\n\n\n

    5.\u00a0<\/strong>Snapshot\u00a0<\/strong>\u9694\u79bb\u6027<\/strong><\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    \u5728\u5b9e\u65f6\u8bfb\u5199\u60c5\u51b5\u4e0b\u3002\u9700\u8981\u505a\u5230\u8bfb\u89c6\u56fe snapshot \u4e00\u81f4\u6027\uff0c\u4e0d\u80fd\u51fa\u73b0\u5e7b\u8bfb\u548c\u672a\u63d0\u4ea4\u8bfb\u3002\u6bcf\u4e2a\u9875\u6709\u591a\u4e2a\u7248\u672c\uff0c\u4fee\u6539\u9875\u5219\u590d\u5236\u4e00\u4efd\u9875\u6570\u636e\uff0c\u5e76\u4ea7\u751f\u65b0\u7684\u7248\u672c\u53f7\uff0c\u591a\u4e2a\u7248\u672c\u7684\u9875\u90fd\u8bb0\u5f55\u5728 page record \u4e2d\u3002\u8bbf\u95ee\u8bf7\u6c42\u643a\u5e26\u4e00\u4e2a\u7248\u672c\u53f7 n+1\uff0c\u5c31\u53ef\u4ee5\u533a\u5206\u5e76\u8bbf\u95ee\u671f\u671b\u7684\u9875\uff0c\u4ece\u800c\u5b9e\u73b0\u4e86\u9694\u79bb\u3002<\/p>\n\n\n\n

    04<\/strong> \u6027\u80fd\u8981\u70b9<\/strong><\/p>\n\n\n\n

    1. <\/strong>Share Nothing<\/strong><\/strong><\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    \u6bd4\u5982\u4e00\u4e2a\u4e24\u8df3\u67e5\u8be2\uff0c\u4e00\u8df3\u662f 500\uff0c\u6700\u7ec8\u9700\u8981\u62c9\u53d6 25 \u4e07\u6570\u636e\u3002\u5047\u5982\u6bcf\u8df3\u662f 5000\uff0c\u90a3\u4e48\u6700\u7ec8\u8bbf\u95ee\u7684\u6570\u636e\u5c31\u4f1a\u6709 2500 \u4e07\u3002\u5f53\u7136\uff0c2500 \u4e07\u6570\u636e\u7684\u8bbf\u95ee\u91cf\u7ea7\u5728\u5b9e\u9645\u4f7f\u7528\u4e2d\u662f\u4e0d\u4f1a\u51fa\u73b0\u7684\uff0c\u6211\u4eec\u90fd\u4f1a\u8fdb\u884c\u9650\u5236\uff0c\u4f46\u5373\u4f7f\u9650\u5236\u5230\u51e0\u5341\u4e07\u7684\u6570\u636e\uff0c\u5bf9\u4e8e\u7ecf\u5178\u7684\u6570\u636e\u5e93\u4e5f\u5f88\u96be\u505a\u5230\u767e\u6beb\u79d2\u4ee5\u5185\u8fd4\u56de\uff0c\u6211\u4eec\u73b0\u5728\u53ef\u4ee5\u505a\u5230\u5341\u4e07\u6570\u636e\u7684\u67e5\u8be2\u8ba1\u7b97 10 \u6beb\u79d2\u91cf\u7ea7\u8fd4\u56de\u3002\u6027\u80fd\u662f\u6bd4\u8f83\u597d\u7684\u3002\u90a3\u4e48\u6211\u4eec\u662f\u5982\u4f55\u505a\u5230\u8fd9\u6837\u7684\u6027\u80fd\u7684\u5462\uff1f<\/p>\n\n\n\n

    \u6bd4\u8f83\u91cd\u8981\u7684\u505a Share Nothing\uff0c\u8fd9\u662f\u6570\u636e\u5e93\u4e2d\u4e00\u4e2a\u6bd4\u8f83\u7ecf\u5178\u7684\u6982\u5ff5\u3002\u7528\u6237\u7684\u4e00\u4e2a\u8bf7\u6c42\u5230\u4e86\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u8fd9\u4e2a\u7ebf\u7a0b\u6709\u4e2a\u534f\u7a0b\uff0c\u534f\u7a0b\u5728\u53d1\u8d77\u8bf7\u6c42\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\u7ebf\u7a0b\u7ed1\u5b9a\u7684\u8fde\u63a5\u6c60\u53d1\u8d77\uff0c\u4e0d\u7528\u518d\u8de8\u7ebf\u7a0b\u3002\u56e0\u4e3a\u8de8\u7ebf\u7a0b\u662f\u5f88\u8017\u65f6\u7684\uff0c\u5373\u4f7f\u4ec0\u4e48\u4e5f\u4e0d\u505a\u4e5f\u8981\u65f6\u5ef6\u5927\u6982 0.08 \u6beb\u79d2\uff0c\u5982\u679c\u591a\u6b21\u8de8\u7ebf\u7a0b\u603b\u65f6\u5ef6\u4f1a\u8fbe\u5230 0.4 \u6beb\u79d2\uff0c\u5bf9\u4e8e\u7ebf\u4e0a\u7684\u4e00\u4e9b\u6838\u5fc3\u4ea7\u54c1\u5e94\u7528\u6765\u8bf4\uff0c\u548c Redis \u5bf9\u6bd4\uff0c0.4 \u6beb\u79d2\u5df2\u7ecf\u662f\u6bd4\u8f83\u9ad8\u7684\u5ef6\u65f6\u4e86\u3002Share Nothing \u8981\u6c42\u8fde\u63a5\u548c\u672c\u7ebf\u7a0b\u8fdb\u884c\u7ed1\u5b9a\uff0c\u548c Tree Service \u7279\u5b9a worker \u7ebf\u7a0b\u7ed1\u5b9a\uff0c\u540c\u6837\uff0c\u5728\u6536\u5230\u8bf7\u6c42\u7684\u60c5\u51b5\u4e0b\uff0c\u4e5f\u662f\u5728\u672c\u7ebf\u7a0b\u6267\u884c\uff0c\u4e3b\u8981\u662f\u8bfb\u7684\u8fc7\u7a0b\uff0c\u5982\u679c\u8981\u53d1\u8d77\u5230 S3 \u51b7\u5b58\u50a8\u67e5\u8be2\u8bf7\u6c42\uff0c\u6216 KV \u78c1\u76d8\u5b58\u50a8\u67e5\u8be2\u8bf7\u6c42\u4e5f\u90fd\u662f\u5728\u672c\u7ebf\u7a0b\u3002\u8fd9\u5c31\u662f Share Nothing \u7684\u6982\u5ff5\uff0c\u5c3d\u91cf\u4e0d\u8981\u8de8\u7ebf\u7a0b\uff0c\u6570\u636e\u4e5f\u662f\u5728\u672c\u7ebf\u7a0b\u5b8c\u6210\u7684\u3002<\/p>\n\n\n\n

    2. <\/strong>\u6570\u636e\u6d41<\/strong><\/strong><\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    \u4ee5\u4e0a\u4ecb\u7ecd\u4e86\u6570\u636e\u8bf7\u6c42\u7684\u8fc7\u7a0b\uff0c\u63a5\u4e0b\u6765\u770b\u4e00\u4e0b\u6570\u636e\u56de\u4f20\u7684\u8fc7\u7a0b\u3002\u6570\u636e\u6700\u7ec8\u7684\u53f6\u5b50\u8282\u70b9\uff0c\u5b58\u50a8\u683c\u5f0f\u662f\u884c\u5b58\uff0c\u4f46\u662f\u5728\u8bfb\u4e4b\u540e\u5c31\u6210\u4e3a\u4e86\u5217\u5b58\u683c\u5f0f\u3002\u56e0\u4e3a\u884c\u5b58\u5728\u66f4\u65b0\u65f6\u6027\u80fd\u4f1a\u6bd4\u8f83\u597d\uff0c\u5217\u5b58\u65f6\u5b9e\u65f6\u66f4\u65b0\u6027\u80fd\u6781\u5dee\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u505a\u4e86\u53d6\u820d\uff0c\u5b58\u50a8\u65f6\u7528\u884c\u5b58\uff0c\u8bfb\u51fa\u4e4b\u540e\u6240\u6709\u6570\u636e\u7528\u5217\u5b58\u3002\u8bfb\u51fa\u4e4b\u540e\u7684\u5217\u5b58\u6570\u636e\u683c\u5f0f\uff0c\u5728\u7ecf\u8fc7 RPC \u65f6\uff0c\u538b\u7f29\u6548\u7387\u548c\u4f20\u8f93\u6548\u7387\u7b49\u90fd\u4f1a\u6bd4\u8f83\u9ad8\u3002\u6700\u7ec8\u5230 Graph \u5c42\uff0c\u6570\u636e\u7ecf\u8fc7\u4e00\u4e2a\u4e2a\u7b97\u5b50\u8868\u8fbe\u5f0f\u3002\u5217\u5b58\u6570\u636e\u4f5c\u4e3a\u7b97\u5b50\u7684\u8f93\u5165\uff0c\u53ef\u4ee5\u505a\u5411\u91cf\u5316\u7684\u8fd0\u7b97\u3002\u6700\u7ec8\u62ff\u5230\u7684\u8f93\u51fa\u4e5f\u662f\u5217\u5f0f\u8fdb\u884c\u8f93\u51fa\uff0c\u6211\u4eec\u7528\u7684\u662f Apache-Arrow \u6570\u636e\u5b58\u50a8\u683c\u5f0f\u8fd4\u56de\u7ed9\u7528\u6237\uff0c\u4e5f\u662f\u5217\u5f0f\u5b58\u50a8\u3002\u56e0\u6b64\uff0c\u8fd9\u6837\u7684\u67b6\u6784\u7279\u522b\u9002\u5408\u56fe\u5730\u67e5\u8be2\u548c\u8ba1\u7b97\u3002<\/p>\n\n\n\n

    <\/p>\n\n\n\n

    \u674e\u672c\u5229<\/strong><\/p>\n\n\n\n

    \u5feb\u624b<\/strong> \u56fe\u6570\u636e\u5e93\u5de5\u7a0b\u5e08<\/strong><\/p>\n\n\n\n

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