{"id":3003,"date":"2019-03-28T20:01:16","date_gmt":"2019-03-28T12:01:16","guid":{"rendered":"https:\/\/damogame.cn:15443\/wordpress\/?p=3003"},"modified":"2019-03-28T20:01:16","modified_gmt":"2019-03-28T12:01:16","slug":"%e6%97%a2%e7%94%9f-redis-%e4%bd%95%e7%94%9f-leveldb-%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/3003","title":{"rendered":"\u65e2\u751f Redis \u4f55\u751f LevelDB \uff1f"},"content":{"rendered":"
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<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\u4e86\u89e3 Redis \u7684\u540c\u5b66\u90fd\u77e5\u9053\u5b83\u662f\u4e00\u4e2a\u7eaf\u5185\u5b58\u7684\u6570\u636e\u5e93\uff0c\u51ed\u501f\u4f18\u79c0\u7684\u5e76\u53d1\u548c\u6613\u7528\u6027\u6253\u4e0b\u4e86\u4e92\u8054\u7f51\u9879\u7684\u534a\u58c1\u6c5f\u5c71\u3002Redis \u4e4b\u6240\u4ee5\u9ad8\u6027\u80fd\u662f\u56e0\u4e3a\u5b83\u7684\u7eaf\u5185\u5b58\u8bbf\u95ee\u7279\u6027\uff0c\u800c\u8fd9\u4e5f\u6210\u4e86\u5b83\u81f4\u547d\u7684\u5f31\u70b9 \u2014\u2014 \u5185\u5b58\u7684\u6210\u672c\u592a\u9ad8\u3002\u6240\u4ee5\u5728\u7edd\u5927\u591a\u6570\u573a\u5408\uff0c\u5b83\u6bd4\u8f83\u9002\u5408\u7528\u6765\u505a\u7f13\u5b58\uff0c\u957f\u671f\u4e0d\u88ab\u8bbf\u95ee\u7684\u51b7\u6570\u636e\u88ab\u6dd8\u6c70\u6389\uff0c\u53ea\u6709\u70ed\u7684\u6570\u636e\u7f13\u5b58\u5728\u5185\u5b58\u4e2d\uff0c\u8fd9\u6837\u5c31\u4e0d\u4f1a\u6d6a\u8d39\u592a\u591a\u6602\u8d35\u7684\u5185\u5b58\u7a7a\u95f4\u3002<\/div>\n<\/header>\n
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\u4f46\u662f Redis \u7684\u8bf1\u60d1\u592a\u5927\u4e86\uff0c\u7528\u5b83\u6765\u505a\u6301\u4e45\u5b58\u50a8\u4f7f\u7528\u8d77\u6765\u592a\u65b9\u4fbf\u4e86\u3002\u8981\u662f\u5185\u5b58\u7684\u4ef7\u683c\u4f4e\u5ec9\uff0c\u771f\u6068\u4e0d\u5f97\u628a\u6240\u6709\u7684\u6570\u636e\u90fd\u5806\u5230 Redis \u4e2d\uff0c\u4f46\u662f\u6280\u672f\u7684\u9009\u62e9\u603b\u662f\u8981\u8003\u8651\u5230\u73b0\u5b9e\u4e16\u754c\u7684\u6210\u672c\u95ee\u9898\u3002\u90a3\u5982\u4f55\u624d\u80fd\u4eab\u53d7\u5230 Redis \u4f5c\u4e3a\u6301\u4e45\u5c42\u6613\u7528\u6027\u7684\u540c\u65f6\u8fd8\u53ef\u4ee5\u8282\u7701\u5185\u5b58\u6210\u672c\u5462\uff1f<\/p>\n

LevelDB \u6765\u4e86\uff01<\/b><\/h2>\n
<\/figure>\n

\u5b83\u662f Google \u5f00\u6e90\u7684 NOSQL \u5b58\u50a8\u5f15\u64ce\u5e93\uff0c\u662f\u73b0\u4ee3\u5206\u5e03\u5f0f\u5b58\u50a8\u9886\u57df\u7684\u4e00\u679a\u539f\u5b50\u5f39\u3002\u5728\u5b83\u7684\u57fa\u7840\u4e4b\u4e0a\uff0cFacebook \u5f00\u53d1\u51fa\u4e86\u53e6\u4e00\u4e2a NOSQL \u5b58\u50a8\u5f15\u64ce\u5e93 RocksDB\uff0c\u6cbf\u7528\u4e86 LevelDB \u7684\u5148\u8fdb\u6280\u672f\u67b6\u6784\u7684\u540c\u65f6\u8fd8\u89e3\u51b3\u4e86 LevelDB \u7684\u4e00\u4e9b\u77ed\u677f\u3002\u4f60\u53ef\u4ee5\u5c06 RocksDB \u6bd4\u55bb\u6210\u6c22\u5f39\uff0c\u5b83\u6bd4 LevelDB \u7684\u5a01\u529b\u66f4\u5927\u4e00\u4e9b\u3002\u73b0\u4ee3\u5f00\u6e90\u5e02\u573a\u4e0a\u6709\u5f88\u591a\u6570\u636e\u5e93\u90fd\u5728\u4f7f\u7528 RocksDB \u4f5c\u4e3a\u5e95\u5c42\u5b58\u50a8\u5f15\u64ce\uff0c\u6bd4\u5982\u5927\u540d\u9f0e\u9f0e\u7684 TiDB\u3002<\/p>\n

<\/figure>\n

\u4f46\u662f\u4e3a\u4ec0\u4e48\u6211\u8981\u8bb2 LevelDB \u800c\u4e0d\u662f RocksDB \u5462\uff1f\u5176\u539f\u56e0\u5728\u4e8e LevelDB \u6280\u672f\u67b6\u6784\u66f4\u52a0\u7b80\u5355\u6e05\u6670\u6613\u4e8e\u7406\u89e3\u3002\u5982\u679c\u6211\u4eec\u5148\u628a LevelDB \u5403\u900f\u4e86\u518d\u53bb\u5543\u4e00\u5543 RocksDB \u5c31\u4f1a\u975e\u5e38\u597d\u61c2\u4e86\uff0cRocksDB \u4e5f\u53ea\u662f\u5728 LevelDB \u7684\u57fa\u7840\u4e0a\u6dfb\u7816\u52a0\u74e6\u8fdb\u884c\u4e86\u4e00\u7cfb\u5217\u4f18\u5316\u800c\u5df2\u3002\u7b49\u5230\u6211\u4eec\u653b\u7834\u4e86 RocksDB \u8fd9\u9897\u6c22\u5f39\uff0cTiDB \u6838\u52a8\u529b\u5b87\u5b99\u98de\u8239\u5df2\u7ecf\u5728\u524d\u65b9\u4e0d\u8fdc\u5904\u7b49\u7740\u6211\u4eec\u4e86\u3002<\/p>\n

Redis \u7f13\u5b58\u6709\u4ec0\u4e48\u95ee\u9898\uff1f<\/b><\/h2>\n

\u5f53\u6211\u4eec\u5c06 Redis \u62ff\u6765\u505a\u7f13\u5b58\u7528\u65f6\uff0c\u80cc\u540e\u80af\u5b9a\u8fd8\u6709\u4e00\u4e2a\u6301\u4e45\u5c42\u6570\u636e\u5e93\u8bb0\u5f55\u4e86\u5168\u91cf\u7684\u51b7\u70ed\u6570\u636e\u3002Redis \u548c\u6301\u4e45\u5c42\u6570\u636e\u5e93\u4e4b\u95f4\u7684\u6570\u636e\u4e00\u81f4\u6027\u662f\u7531\u5e94\u7528\u7a0b\u5e8f\u81ea\u5df1\u6765\u63a7\u5236\u7684\u3002\u5e94\u7528\u7a0b\u5e8f\u4f1a\u4f18\u5148\u53bb\u7f13\u5b58\u4e2d\u83b7\u53d6\u6570\u636e\uff0c\u5f53\u7f13\u5b58\u4e2d\u6ca1\u6709\u6570\u636e\u65f6\uff0c\u5e94\u7528\u7a0b\u5e8f\u9700\u8981\u4ece\u6301\u4e45\u5c42\u52a0\u8f7d\u6570\u636e\uff0c\u7136\u540e\u518d\u653e\u8fdb\u7f13\u5b58\u4e2d\u3002\u5f53\u6570\u636e\u66f4\u65b0\u53d1\u751f\u65f6\uff0c\u9700\u8981\u5c06\u7f13\u5b58\u7f6e\u4e3a\u5931\u6548\u3002<\/p>\n<\/div>\n

function getUser(String userId) User {\r\n  User user = redis.get(userId);\r\n  if user == null {\r\n    user = db.get(userId);\r\n    if user != null {\r\n      redis.set(userId, user);\r\n    }\r\n  }\r\n  return user;\r\n}\r\n\r\nfunction updateUser(String userId, User user) {\r\n  db.update(userId, user);\r\n  redis.expire(userId);\r\n}<\/pre>\n
\n
\u6709\u8fc7\u8fd9\u65b9\u9762\u5f00\u53d1\u7ecf\u9a8c\u7684\u670b\u53cb\u4eec\u5c31\u77e5\u9053\u5199\u8fd9\u6837\u7684\u4ee3\u7801\u8fd8\u662f\u633a\u7e41\u7410\u7684\uff0c\u6240\u6709\u7684\u6d89\u53ca\u5230\u7f13\u5b58\u7684\u4e1a\u52a1\u4ee3\u7801\u90fd\u9700\u8981\u52a0\u4e0a\u8fd9\u4e00\u90e8\u5206\u903b\u8f91\u3002<\/p>\n
<\/figure>\n
\u4e25\u683c\u6765\u8bf4\u6211\u4eec\u8fd8\u9700\u8981\u4ed4\u7ec6\u8003\u8651\u7f13\u5b58\u4e00\u81f4\u6027\u95ee\u9898\uff0c\u6bd4\u5982\u5728 updateUser \u65b9\u6cd5\u4e2d\uff0c\u6570\u636e\u5e93\u6b63\u786e\u6267\u884c\u4e86\u66f4\u65b0\uff0c\u4f46\u662f\u7f13\u5b58 redis \u56e0\u4e3a\u7f51\u7edc\u6296\u52a8\u7b49\u539f\u56e0\u7f6e\u4e3a\u5931\u6548\u6ca1\u6709\u6210\u529f\uff0c\u90a3\u4e48\u7f13\u5b58\u4e2d\u7684\u6570\u636e\u5c31\u6210\u4e86\u8fc7\u671f\u6570\u636e\u3002\u5982\u679c\u4f60\u5c06\u8bbe\u7f6e\u7f13\u5b58\u548c\u66f4\u65b0\u6301\u4e45\u5b58\u7684\u5148\u540e\u987a\u5e8f\u53cd\u8fc7\u6765\uff0c\u4e5f\u8fd8\u662f\u4f1a\u6709\u5176\u5b83\u95ee\u9898\uff0c\u8fd9\u4e2a\u8bfb\u8005\u53ef\u4ee5\u81ea\u884c\u601d\u8003\u4e00\u4e0b\u3002<\/p>\n
<\/figure>\n
\u5728\u591a\u8fdb\u7a0b\u9ad8\u5e76\u53d1\u573a\u5408\u4e5f\u4f1a\u5bfc\u81f4\u7f13\u5b58\u4e0d\u4e00\u81f4\uff0c\u6bd4\u5982\u4e00\u4e2a\u8fdb\u7a0b\u5bf9\u67d0\u4e2a userId \u8c03\u7528 getUser() \u65b9\u6cd5\uff0c\u56e0\u4e3a\u7f13\u5b58\u91cc\u6ca1\u6709\uff0c\u5b83\u9700\u8981\u4ece\u6570\u636e\u5e93\u91cc\u52a0\u8f7d\u3002\u7ed3\u679c\u521a\u521a\u52a0\u8f7d\u51fa\u6765\uff0c\u6b63\u51c6\u5907\u8981\u8bbe\u7f6e\u7f13\u5b58\uff0c\u8fd9\u65f6\u5019\u53d1\u751f\u4e86\u5185\u5b58 fullgc \u4ee3\u7801\u6682\u505c\u4e86\u4e00\u4f1a\uff0c\u800c\u6b63\u5728\u6b64\u65f6\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u8c03\u7528\u4e86 updateUser \u65b9\u6cd5\u66f4\u65b0\u4e86\u6570\u636e\u5e93\uff0c\u5c06\u7f13\u5b58\u7f6e\u4e3a\u5931\u6548\uff08\u5176\u5b9e\u7f13\u5b58\u91cc\u672c\u6765\u5c31\u6ca1\u6709\u6570\u636e\uff09\u3002\u7136\u540e\u524d\u9762\u90a3\u4e2a\u8fdb\u7a0b\u7ec8\u4e8e fullgc \u7ed3\u675f\u8981\u5f00\u59cb\u8bbe\u7f6e\u7f13\u5b58\u4e86\uff0c\u8fd9\u65f6\u5019\u8fdb\u7f13\u5b58\u7684\u5c31\u662f\u8fc7\u671f\u7684\u6570\u636e\u3002<\/p>\n
LevelDB \u662f\u5982\u4f55\u89e3\u51b3\u7684\uff1f<\/b><\/h2>\n
LevelDB \u5c06 Redis \u7f13\u5b58\u548c\u6301\u4e45\u5c42\u5408\u4e8c\u4e3a\u4e00\uff0c\u4e00\u6b21\u6027\u5e2e\u4f60\u641e\u5b9a\u7f13\u5b58\u548c\u6301\u4e45\u5c42\u3002\u6709\u4e86 LevelDB\uff0c\u4f60\u7684\u4ee3\u7801\u53ef\u4ee5\u7b80\u5316\u6210\u4e0b\u9762\u8fd9\u6837<\/p>\n
\n
function getUser(String userId) User {\r\n  return leveldb.get(userId);\r\n}\r\n\r\nfunction updateUser(String userId, User user) {\r\n  leveldb.set(userId, user);\r\n}<\/pre>\n
\u800c\u4e14\u4f60\u518d\u4e5f\u4e0d\u7528\u5f53\u5fc3\u7f13\u5b58\u4e00\u81f4\u6027\u95ee\u9898\u4e86\uff0cLevelDB \u7684\u6570\u636e\u66f4\u65b0\u8981\u4e48\u6210\u529f\u8981\u4e48\u4e0d\u6210\u529f\uff0c\u4e0d\u5b58\u5728\u4e2d\u95f4\u859b\u5b9a\u8c14\u72b6\u6001\u3002LevelDB \u7684\u5185\u90e8\u5df2\u7ecf\u5185\u7f6e\u4e86\u5185\u5b58\u7f13\u5b58\u548c\u6301\u4e45\u5c42\u7684\u78c1\u76d8\u6587\u4ef6\uff0c\u7528\u6237\u5b8c\u5168\u4e0d\u7528\u64cd\u5fc3\u5185\u90e8\u662f\u6570\u636e\u5982\u4f55\u4fdd\u6301\u4e00\u81f4\u7684\u3002<\/p>\n<\/div>\n
LevelDB \u5177\u4f53\u662f\u4ec0\u4e48\uff1f<\/b><\/h2>\n
\u524d\u9762\u6211\u4eec\u8bf4\u9053\u5b83\u662f\u4e00\u4e2a NOSQL \u5b58\u50a8\u5f15\u64ce\uff0c\u5b83\u548c Redis \u4e0d\u662f\u4e00\u4e2a\u6982\u5ff5\u3002Redis \u662f\u4e00\u4e2a\u5b8c\u5907\u7684\u6570\u636e\u5e93\uff0c\u800c LevelDB \u5b83\u53ea\u662f\u4e00\u4e2a\u5f15\u64ce\u3002\u5982\u679c\u5c06\u6570\u636e\u5e93\u6bd4\u55bb\u6210\u4e00\u8f86\u9ad8\u7ea7\u8dd1\u8f66\uff0c\u90a3\u4e48\u5b58\u50a8\u5f15\u64ce\u5c31\u662f\u5b83\u7684\u53d1\u52a8\u673a\uff0c\u662f\u6838\u5fc3\u662f\u5fc3\u810f\u3002\u6709\u4e86\u8fd9\u4e2a\u53d1\u52a8\u673a\uff0c\u6211\u4eec\u518d\u7ed9\u5b83\u5305\u88c5\u4e0a\u4e00\u7cfb\u5217\u7684\u914d\u4ef6\u548c\u88c5\u9970\uff0c\u5c31\u53ef\u4ee5\u6210\u4e3a\u6570\u636e\u5e93\u3002\u4e0d\u8fc7\u4e5f\u4e0d\u8981\u5c0f\u77a7\u4e86\u914d\u4ef6\u548c\u88c5\u9970\uff0c\u505a\u5230\u6781\u81f4\u90a3\u4e5f\u662f\u975e\u5e38\u56f0\u96be\uff0c\u5c06 LevelDB \u5305\u88c5\u6210\u4e00\u4e2a\u7b80\u5355\u6613\u7528\u7684\u6570\u636e\u5e93\u9700\u8981\u52a0\u4e0a\u592a\u591a\u592a\u591a\u7cbe\u81f4\u7684\u914d\u4ef6\u3002LevelDB \u548c RocksDB \u51fa\u6765\u8fd9\u4e48\u591a\u5e74\uff0c\u80fd\u591f\u5728\u5b83\u7684\u57fa\u7840\u4e0a\u505a\u51fa\u975e\u5e38\u4e00\u4e2a\u5b8c\u5907\u7684\u751f\u4ea7\u7ea7\u6570\u636e\u5e93\u5be5\u5be5\u65e0\u51e0\u3002<\/p>\n
\u5728\u4f7f\u7528 LevelDB \u65f6\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u5c06\u5b83\u770b\u6210\u4e00\u4e2a Key\/Value \u5185\u5b58\u6570\u636e\u5e93\u3002\u5b83\u63d0\u4f9b\u4e86\u57fa\u7840\u7684 Get\/Set API\uff0c\u6211\u4eec\u5728\u4ee3\u7801\u91cc\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e2a API \u6765\u8bfb\u5199\u6570\u636e\u3002\u4f60\u8fd8\u53ef\u4ee5\u5c06\u5b83\u770b\u6210\u4e00\u4e2a\u65e0\u9650\u5927\u5c0f\u7684\u9ad8\u7ea7 HashMap\uff0c\u6211\u4eec\u53ef\u4ee5\u5f80\u91cc\u9762\u585e\u5165\u65e0\u9650\u6761 Key\/Value \u6570\u636e\uff0c\u53ea\u8981\u78c1\u76d8\u53ef\u4ee5\u88c5\u4e0b\u3002<\/p>\n
\u6b63\u662f\u56e0\u4e3a\u5b83\u53ea\u80fd\u7b97\u4f5c\u4e00\u4e2a\u5185\u5b58\u6570\u636e\u5e93\uff0c\u5b83\u91cc\u9762\u88c5\u7684\u6570\u636e\u65e0\u6cd5\u8de8\u8fdb\u7a0b\u8de8\u673a\u5668\u5171\u4eab\u3002\u5728\u5206\u5e03\u5f0f\u9886\u57df\uff0cLevelDB \u8981\u5982\u4f55\u5927\u663e\u8eab\u624b\u5462\uff1f<\/p>\n
<\/figure>\n
\u8fd9\u5c31\u9700\u8981\u9760\u5305\u88c5\u6280\u672f\u4e86\uff0c\u5728 LevelDB \u5185\u5b58\u6570\u636e\u5e93\u7684\u57fa\u7840\u4e0a\u5305\u88c5\u4e00\u5c42\u7f51\u7edc API\u3002\u5f53\u4e0d\u540c\u673a\u5668\u4e0a\u4e0d\u540c\u7684\u8fdb\u7a0b\u8981\u6765\u8bbf\u95ee\u5b83\u65f6\uff0c\u90fd\u7edf\u4e00\u8d70\u7f51\u7edc API \u63a5\u53e3\u3002\u8fd9\u6837\u5c31\u5f62\u6210\u4e86\u4e00\u4e2a\u7b80\u6613\u7684\u6570\u636e\u5e93\u3002\u5982\u679c\u5728\u7f51\u7edc\u5c42\u6211\u4eec\u4f7f\u7528 Redis \u534f\u8bae\u6765\u5305\u88c5\uff0c\u90a3\u4e48\u4f7f\u7528 Redis \u7684\u5ba2\u6237\u7aef\u5c31\u53ef\u4ee5\u8bfb\u5199\u8fd9\u4e2a\u6570\u636e\u5e93\u4e86\u3002<\/p>\n
<\/figure>\n
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\u5982\u679c\u4f60\u9700\u8981\u7684\u6570\u636e\u5bb9\u91cf\u7279\u522b\u5927\u4ee5\u81f3\u4e8e\u5355\u4e2a\u673a\u5668\u7684\u786c\u76d8\u90fd\u5bb9\u4e0d\u4e0b\uff0c\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u6570\u636e\u5206\u7247\u673a\u5236\u5c06\u6574\u4e2a\u6570\u636e\u5e93\u7684\u6570\u636e\u5206\u6563\u5230\u591a\u53f0\u673a\u5668\u4e0a\uff0c\u6bcf\u53f0\u673a\u5668\u53ea\u8d1f\u8d23\u4e00\u90e8\u5206\u6570\u636e\u7684\u8bfb\u5199\u5de5\u4f5c\u3002\u6570\u636e\u5206\u7247\u7684\u65b9\u6848\u975e\u5e38\u591a\uff0c\u53ef\u4ee5\u50cf Codis \u90a3\u6837\u901a\u8fc7\u8f6c\u53d1\u4ee3\u7406\u6765\u5206\u7247\uff0c\u4e5f\u53ef\u4ee5\u50cf Redis-Cluster \u90a3\u6837\u4f7f\u7528\u5ba2\u6237\u7aef\u8f6c\u53d1\u673a\u5236\u6765\u5206\u7247\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528 TiDB \u7684 Raft \u5206\u5e03\u5f0f\u4e00\u81f4\u6027\u7b97\u6cd5\u6765\u5206\u7ec4\u7ba1\u7406\u5206\u7247\u3002\u6700\u7b80\u5355\u6700\u6613\u4e8e\u7406\u89e3\u7684\u8fd8\u662f\u8981\u6570 Codis \u7684\u8f6c\u53d1\u4ee3\u7406\u5206\u7247\u3002<\/p>\n
<\/figure>\n
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