{"id":224858,"date":"2014-12-29T15:48:40","date_gmt":"2014-12-29T07:48:40","guid":{"rendered":"http:\/\/yangzhe1991.org\/blog\/?p=224858"},"modified":"2014-12-29T16:33:38","modified_gmt":"2014-12-29T08:33:38","slug":"cassandra-code-reading-batch-implementation","status":"publish","type":"post","link":"https:\/\/yangzhe1991.org\/blog\/2014\/12\/cassandra-code-reading-batch-implementation\/","title":{"rendered":"Cassandra\u6e90\u7801\u9605\u8bfb\u4e4bBatch\u5b9e\u73b0"},"content":{"rendered":"

Cassandra\u7684batch\uff0c\u5c31\u662f\u4e00\u6b21\u63d0\u4ea4\u591a\u4e2a\u4fee\u6539\u64cd\u4f5c\uff0c\u8282\u7701\u4f20\u8f93\u8bf7\u6c42\u7684\u8d44\u6e90\u6d88\u8017\u3002\u540c\u65f6\u4e5f\u53ef\u4ee5\u7406\u89e3\u4e3a\u4e00\u79cd\u4e8b\u52a1\u7684\u89e3\u51b3\u65b9\u6848\u2014\u2014all or nothing\uff0c\u8fd9\u4e9b\u64cd\u4f5c\u53ef\u4ee5\u4fdd\u8bc1\u8981\u4e48\u90fd\u6210\u529f\u8981\u4e48\u90fd\u4e0d\u6210\u529f\uff0c\u5373\u539f\u5b50\u6027\u3002<\/p>\n

<\/p>\n

\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u51e0\u70b9\uff1a<\/p>\n

1\uff1abatch\u53ea\u4fdd\u8bc1\u539f\u5b50\u6027\uff0c\u8981\u4e48\u90fd\u6210\u529f\u8981\u4e48\u90fd\u5931\u8d25\uff0c\u4e0d\u4fdd\u8bc1\u9694\u79bb\u6027\u3002\u5c31\u662f\u8bf4\u53ef\u80fd\u5b58\u5728\u67d0\u4e2a\u65f6\u95f4\u70b9\uff0cbatch\u7684\u82e5\u5e72\u4e2a\u4fee\u6539\u53ea\u80fd\u8bfb\u5230\u4e00\u90e8\u5206\u3002\u540c\u65f6batch\u4e5f\u53ef\u4ee5\u6307\u5b9a\u672c\u6b21\u64cd\u4f5c\u4e0d\u9700\u8981\u4fdd\u8bc1\u539f\u5b50\u6027\uff0c\u8fd9\u6837\u663e\u7136\u6027\u80fd\u4f1a\u66f4\u9ad8\u3002\u53e6\u5916counter\u56e0\u4e3a\u4e0d\u662f\u5e42\u7b49\u64cd\u4f5c\uff08\u591a\u52a0\u4e86\u4e00\u6b21\u603b\u548c\u5c31\u53d8\u4e86\uff09\u4ee5\u53ca\u5176\u5b9e\u73b0\u6bd4\u8f83\u590d\u6742\uff0c\u4e0d\u652f\u6301\u539f\u5b50\u6027\u7684batch\u3002<\/p>\n

2\uff1abatch\u4e2d\u9488\u5bf9\u540c\u4e00\u4e2arow\u7684\u64cd\u4f5c\u4f1a\u5148\u5408\u5e76\u518d\u5199\uff0c\u76f4\u63a5\u53d8\u6210\u4e86\u4e00\u6761\u64cd\u4f5c\u3002\u6240\u4ee5Cassandra\u662f\u53ef\u4ee5\u901a\u8fc7static column\u7684batch<\/a>\u6765\u5b9e\u73b0\u8ba2\u5355\u548c\u4f59\u989d\u5728\u4e00\u4e2a\u8868\uff0c\u4e00\u4e2a\u4eba\u7684\u5168\u90e8\u8ba2\u5355\u548c\u4f59\u989d\u653e\u5728\u4e00\u4e2arow\uff0c\u5bf9\u4e00\u4e2arow key(userid)\u540c\u65f6\u5199\u6210\u4ea4\u65b0\u8ba2\u5355\u548c\u4f59\u989d\u4fee\u6539\u64cd\u4f5c\uff0c\u8fd9\u6837\u53ef\u4ee5\u901a\u8fc7batch\u6765\u5b9e\u73b0\u539f\u5b50\u6027+\u9694\u79bb\u6027\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u53ea\u6d89\u53ca\u5230\u4e00\u4e2a\u4eba\u7684\u4f59\u989d\u53d8\u5316\u53ca\u8ba2\u5355\u6210\u4ea4\uff0c\u6ca1\u6709\u53e6\u4e00\u4e2a\u4eba\u7684\u4f59\u989d\u53d8\u5316\uff0c\u662f\u53ef\u4ee5\u641e\u7684\uff0c\u800c\u53e6\u4e00\u79cd\u4e8b\u52a1\u7684\u5178\u578b\u573a\u666f\u2014\u2014\u4e00\u4e2a\u4eba\u7ed9\u53e6\u4e00\u4e2a\u4eba\u8f6c\u8d26\uff0c\u4e00\u4e2a\u4f59\u989d\u589e\u52a0\u4e00\u4e2a\u4f59\u989d\u51cf\u5c11\u2014\u2014\u8fd9\u79cd\u8de8\u884c\u4e8b\u52a1Cassandra\u5e94\u8be5\u81f3\u5c11\u76ee\u524d\u662f\u641e\u4e0d\u5b9a\u7684\u3002<\/p>\n

3\uff1a\u975ebatch\u7684\u666e\u901a\u4fee\u6539\u8bf7\u6c42\uff0c\u5728\u5199\u5931\u8d25\u7684\u65f6\u5019\u4e0d\u4f1a\u56de\u6eda\uff0c\u6bd4\u5982QUORUM\u7684\u64cd\u4f5c\uff0c\u5199\u4e24\u4efdclient\u624d\u8ba4\u4e3a\u6210\u529f\uff0c\u5047\u59823\u4e2a\u8282\u70b9\u53ea\u5199\u6210\u4e86\u4e00\u4efd\u53e6\u4e24\u4efd\u8d85\u65f6\uff0cclient\u4f1a\u62a5\u9519\u8bf4\u5199\u5165\u5931\u8d25\uff0c\u4f46\u5b9e\u9645\u4e0a\u5199\u6210\u4e86\u7684\u90a3\u4efd\u4e5f\u6ca1\u56de\u6eda\u3002\u4e0d\u8fc7\u8fd9\u4e2a\u5012\u662f\u95ee\u9898\u4e0d\u5927\uff0c\u6bd5\u7adf\u5199\u5931\u8d25\u7684\u65f6\u5019client\u53ef\u4ee5\u91cd\u8bd5\u7684\uff0c\u5e42\u7b49\u7684\u64cd\u4f5c\u53cd\u590d\u5199\u4e5f\u6ca1\u4e8b\u3002<\/p>\n

\u6267\u884cbatch\u64cd\u4f5c\u7684\u903b\u8f91\uff0c\u548c\u5176\u4ed6\u903b\u8f91\u4e00\u6837\uff0cCQL\u89e3\u6790\u5b8c\u4e86\u4e4b\u540e\u53d1\u73b0\u8fd9\u662fbatch\uff0c\u5c31\u628a\u6bcf\u4e2a\u5199\u64cd\u4f5c\u5c01\u88c5\u6210List<Mutation>\u6267\u884cStorageProxy.mutateWithTriggers\uff0c\u7136\u540e\u6839\u636e\u64cd\u4f5c\u7684\u5bf9\u8c61\u6216\u8bed\u53e5option\u6765\u5224\u65ad\u5e94\u8be5mutateAtomically\u8fd8\u662fmutate\u3002mutate\u5c31\u8ddf\u666e\u901a\u7684\u5199\u64cd\u4f5c\u6ca1\u533a\u522b\u4e86\uff0c\u6bcf\u6761\u64cd\u4f5c\u6328\u4e2a\u6267\u884c\u3002<\/p>\n

\u4e3a\u4e86\u4fdd\u8bc1\u539f\u5b50\u6027\uff0c\u5199\u5165\u4e4b\u524d\u4f1a\u5148\u751f\u6210\u4e00\u4e2abatchlog\uff0c\u5c06\u6574\u4e2abatch\u5185\u5168\u90e8Mutation\u5e8f\u5217\u5316\uff0c\u5e26\u4e0a\u5f53\u524d\u65f6\u95f4\u6233\u548cbatch\u8bf7\u6c42\u7684\u65f6\u95f4\u6233\uff08\u53ef\u4ee5\u662f\u5ba2\u6237\u7aef\u6307\u5b9a\u4e5f\u53ef\u4ee5\u662f\u7528\u63a5\u53d7\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u8282\u70b9\u7684\u65f6\u95f4\u6233\uff09\uff0c\u4f20\u7ed9\u672c\u5730\u673a\u623f\u7684\u82e5\u5e72\u4e2a\u8282\u70b9\uff0c\u8981\u6c42\u6ee1\u8db3\u4e00\u81f4\u6027\u8981\u6c42\u7684\u8282\u70b9\u6570\u5e76\u4e14\u4e0d\u5c0f\u4e8e2\u3002\u56e0\u4e3abatch\u8bf7\u6c42\u7684row key\u53ef\u80fd\u4e0d\u540c\uff0c\u8fd9\u91cc\u5b58\u50a8batchlog\u7684\u8282\u70b9\u7684\u9009\u62e9\u5176\u5b9e\u53ea\u662f\u627e\u82e5\u5e72\u4e2a\u5c3d\u53ef\u80fd\u4e0d\u5728\u540c\u4e00\u4e2a\u673a\u67b6\u4e0a\u7684\u8282\u70b9\uff0c\u5c31\u662f\u4e3a\u4e86\u9632\u4e22\u6570\u636e\u3002<\/p>\n

CREATE TABLE system.batchlog (\r\n    id uuid PRIMARY KEY,\r\n    data blob,\r\n    version int,\r\n    written_at timestamp\r\n)\r\n<\/pre>\n
batchlog\u7684\u8868\u5b9a\u4e49\u5982\u4e0a\uff0c\u4e5f\u56e0\u4e3a\u4f1a\u628a\u5168\u90e8Mutation\u5e8f\u5217\u5316\u6210blob\u5b58\u50a8\uff0c\u5982\u679c\u64cd\u4f5c\u5360\u7528\u7684\u7a7a\u95f4\u592a\u5927\uff08\u9ed8\u8ba4\u662f5K\uff09\uff0c\u4f1a\u62a5warning\uff0c\u6bd5\u7adf\u5927\u7684blob\u7684\u8bfb\u5199\u4f1a\u7565\u5fae\u5f71\u54cdCassandra\u7684\u6027\u80fd\u3002\u5982\u679c\u8fd9\u91cc\u5199\u5165\u8d85\u65f6\u4e86\uff0c\u6574\u4e2a\u8bf7\u6c42\u62a5\u8d85\u65f6\u5f02\u5e38\u8fd4\u56de\u3002<\/p>\n
\u7136\u540e\u5c31\u53ef\u4ee5\u6b63\u5f0f\u7684\u5199\u6570\u636e\u4e86\uff0c\u9010\u6761\u53d1\u9001\u7ed9row key\u6240\u5728\u7684\u8282\u70b9\u3002\u8fd9\u6b65\u603b\u4f53\u662f\u540c\u6b65\u7684\uff0c\u4f46batch\u4e2d\u7684\u6bcf\u4e2aMutation\u662f\u5f02\u6b65\u7684\u53d1\uff0c\u6700\u540e\u963b\u585e\u7b49\u5f85\u5168\u90e8\u8fd4\u56de\u3002\u5982\u679c\u8fd9\u91cc\u6709\u67d0\u4e2aMutation\u8d85\u65f6\uff0c\u90a3\u6574\u4e2a\u8bf7\u6c42\u629b\u8d85\u65f6\u5f02\u5e38\u8fd4\u56de\u3002<\/p>\n
\u6267\u884c\u5b8c\u8fd9\u6b65\u6ca1\u629b\u5f02\u5e38\uff0c\u8bf4\u660e\u6240\u6709Mutation\u90fd\u5199\u6210\u529f\u4e86\uff0c\u8fd4\u56declient\u6210\u529f\u5e76\u5f02\u6b65\u5220\u9664batchlog\u3002<\/p>\n
\u663e\u7136\u53ea\u6709\u8fd9\u4e9b\u662f\u4e0d\u591f\u7684\uff0c\u56e0\u4e3a\u5982\u679c\u5728\u5199Mutation\u7684\u65f6\u5019\u90e8\u5206\u8bf7\u6c42\u6ca1\u5199\u6210\uff0c\u4f1a\u5bfc\u81f4\u6574\u4e2abatch\u90e8\u5206\u6210\u529f\u90e8\u5206\u5931\u8d25\u3002\u5f53\u7136\uff0c\u5982\u679c\u8fd9\u4e2a\u65f6\u5019\u9a6c\u4e0a\u6765\u8bfb\uff08\u6216\u8005Mutation\u6b63\u5728\u6267\u884c\u8fd8\u4e0d\u77e5\u9053\u662f\u5426\u5168\u90e8\u6210\u529f\u7684\u65f6\u5019\uff09\uff0c\u5c31\u662f\u6240\u8c13\u4e0d\u6ee1\u8db3\u9694\u79bb\u6027\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u65f6\u5019\u8bfb\u53ea\u80fd\u8bfb\u5230\u90a3\u4e9b\u5df2\u7ecf\u6210\u529f\u7684\uff0c\u8fd8\u5728\u6267\u884c\u7684\u548c\u5df2\u7ecf\u5931\u8d25\u7684\u8fd8\u662f\u8bfb\u4e0d\u5230\u3002<\/p>\n
\u800c\u8fd9\u4e2a\u65f6\u5019\u5c31\u9700\u8981batchlog\u8d77\u4f5c\u7528\u4e86\u3002\u6bcf\u4e2a\u8282\u70b9\u6709\u4e2a\u72ec\u7acb\u7684BatchlogManagerMBean\uff0c\u6765\u7ef4\u62a4batchlog\u4fe1\u606f\u3002\u8fd9\u4e2aMBean\u7528scheduleWithFixedDelay\u95f4\u969460\u79d2\u6765\u8d77\u4e00\u4e2a\u7ebf\u7a0b\u628a\u672c\u5730batchlog\u8868\u4e2d\u6240\u6709\u7684log\u62ff\u51fa\u6765\u53bb\u518d\u628a\u6bcf\u4e2aMutation\u5199\u4e00\u904d\uff08\u4e5f\u56e0\u6b64batchlog\u8981\u6c42\u5fc5\u987b\u662f\u5e42\u7b49\u7684\u64cd\u4f5c\uff0c\u4e5f\u5c31\u662f\u4e0d\u80fd\u64cd\u4f5ccounter\uff0c\u56e0\u4e3a\u4e0d\u6015\u91cd\u590d\u6267\u884c\uff09\u3002\u8fd9\u91cc\u4f1a\u6d89\u53ca\u5230\u4e00\u4e9b\u7ec6\u8282\uff1a\u6bd4\u5982\u4e3a\u4e86\u4e0d\u52a0\u91cd\u8d1f\u8f7d\u5199\u7684\u65f6\u5019\u6709\u4e2a\u9650\u901f\uff08\u987a\u4fbf\u8bf4\u4e0bCassandra\u7684\u6240\u6709\u9650\u901f\u90fd\u662f\u901a\u8fc7guava\u7684RateLimiter<\/a>\u6765\u5b9e\u73b0\uff09\uff1b\u6bcf\u6b21\u4ecebatchlog\u91cc\u62ff128\u6761\u53bb\u5199\uff0c\u7136\u540ewhile\u5faa\u73af\u4e0d\u65ad\u7684\u53d6\u76f4\u5230\u5269\u4f59\u7684log\u4e0d\u5230128\u4e86\u5c31\u505c\u6b62\u9694\u4e0b\u4e00\u5206\u949f\u518d\u53d6\uff1b\u5199batchlog\u7684\u65f6\u5019\u5f97\u8bb0\u5f55batch\u751f\u6210\u7684\u65f6\u95f4\u6233\u4ee5\u53ca\u6574\u4e2abatch\u7684\u8d85\u65f6\u65f6\u95f4\uff0c\u786e\u4fdd\u53ea\u628a\u90a3\u4e9b\u786e\u5b9e\u8d85\u65f6\u4e86\u4e4b\u540e\u8fd8\u6ca1\u5220\u9664\u7684batchlog\u6267\u884creplay\uff08\u56e0\u4e3a\u8fd9\u4e9b\u5f88\u53ef\u80fd\u662f\u56e0\u4e3a\u5199\u5931\u8d25\u4e86\u6ca1\u5220\u6389log\uff09\u3002\u5168\u90e8Mutation\u90fd\u5199\u6210\u4e86\uff0c\u5c31\u5220\u9664\u8fd9\u6761log\uff0c\u5426\u5219\u7559\u7740\u7b49\u4e0b\u4e00\u6b21\u6267\u884c\u518d\u8bd5\u4e00\u6b21\uff0c\u76f4\u5230\u6700\u7ec8\u90fd\u5199\u6210\u4e86\u3002<\/p>\n
\u56e0\u6b64\uff0c\u6240\u8c13batch\u4fdd\u8bc1\u539f\u5b50\u6027\uff0c\u8981\u4e48\u90fd\u6210\u529f\u8981\u4e48\u90fd\u5931\u8d25\uff0c\u5176\u5b9e\u5c31\u662f\u53ea\u8981batchlog\u5199\u6210\u4e86\uff0c\u90a3\u6700\u7ec8\u4e00\u5b9a\u4fdd\u8bc1\u90fd\u6210\u529f\uff0c\u53ea\u6709\u5199batchlog\u7684\u65f6\u5019\u5c31\u60b2\u5267\u4e86\uff0c\u624d\u4f1a\u90fd\u5931\u8d25\u3002\u800c\u4e14\u56e0\u4e3abatchlog\u81f3\u5c11\u8981\u5199\u4e24\u4efd\uff0c\u53ea\u8981\u6709\u4e00\u4efd\u5199\u6210\u4e86\uff0c\u90a3\u6700\u7ec8\u4e5f\u80af\u5b9a\u90fd\u4f1a\u628a\u6240\u6709Mutation\u5199\u8fdb\u53bb\u3002<\/p>\n
\u53e6\u5916\uff0cbatch\u4e2d\u7684\u591a\u6b21\u5199\u64cd\u4f5c\u5982\u679c\u5176\u4e2d\u6709\u4e00\u4e2a\u662f\u7528\u4e86CAS\u7684\uff0c\u90a3\u4e48\u6574\u4e2abatch\u7684\u6240\u6709\u64cd\u4f5c\u5fc5\u987b\u662f\u9488\u5bf9\u540c\u4e00\u4e2arow\u7684\uff0c\u56e0\u4e3a\u540c\u4e00\u4e2arow\u7684\u64cd\u4f5c\u4f1a\u5408\u5e76\u6210\u4e00\u4e2a\u64cd\u4f5c\uff0c\u8fd9\u6837\u53ef\u4ee5\u4e00\u6b21CAS\u8bf7\u6c42\u5199\u5168\u90e8\u3002\u5982\u679c\u591a\u4e2arow\u7684batch\u6709\u4e86CAS\u5c31\u662f\u4e0d\u53ef\u63a7\u7684\u4e86\uff0c\u4e00\u65e6\u8fd9\u4e2aCAS\u6302\u4e86\u5176\u4ed6row\u7684\u64cd\u4f5c\u6ca1\u529e\u6cd5\u56de\u6eda\uff0c\u5c31\u4e0d\u80fd\u4fdd\u8bc1\u539f\u5b50\u6027\u4e86\u3002<\/p>\n
\u603b\u7ed3\u8d77\u6765\u8bf4\uff0c\u5c31\u662f\u8fd9\u4e2abatch\uff0c\u53ea\u80fd\u964d\u4f4e\u4e00\u70b9\u70b9client\u5230node\u7684\u7f51\u7edc\u4f20\u8f93\uff0c\u4f46\u5e76\u4e0d\u80fd\u63d0\u9ad8\u6027\u80fd\uff08\u53cd\u800c\u4e0b\u964d\u56e0\u4e3a\u8981\u6709batchlog\uff09\uff0c\u800c\u4e14\u56e0\u4e3a\u4e00\u65e6\u8de8\u884c\/\u8de8\u8868\u5c31\u4e0d\u80fd\u4fdd\u8bc1\u9694\u79bb\u6027\uff0c\u6240\u4ee5\u672c\u8d28\u4e0a\u8ddfclient\u9010\u4e2a\u5199\u7136\u540e\u628a\u6ca1\u6210\u529f\u7684\u82e5\u5e72\u4e2a\u53cd\u590d\u91cd\u8bd5\u6ca1\u6709\u533a\u522b\uff0c\u9876\u591a\u662f\u4ed6\u662f\u4fe9\u8282\u70b9\u5b58batchlog\u4e0d\u6015\u5b95\u673a\u800c\u5ba2\u6237\u7aef\u53ef\u80fd\u5199\u4e00\u534a\u673a\u5668\u6302\u4e86\u3002\u751a\u81f3\u7406\u8bba\u4e0aclient\u4e0a\u7528\u5f02\u6b65\u63a5\u53e3\u540c\u65f6\u5199N\u6761\u53ef\u80fd\u66f4\u5feb\uff0c\u56e0\u4e3aclient driver\u4e00\u822c\u4f1a\u4f18\u5316\uff0c\u5728\u9009\u62e9\u8282\u70b9\u7684\u65f6\u5019\u662f\u5148\u770brow key\u7684\u4f4d\u7f6e\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u867d\u7136Cassandra\u4e0d\u9700\u8981smart client\uff0c\u968f\u4fbf\u8fde\u4e00\u4e2anode\u5c31\u80fd\u6267\u884c\u5168\u90e8\u64cd\u4f5c\uff0c\u4f46\u5b9e\u9645\u4e0a\u4e00\u822cclient\u5b9e\u73b0\u7684\u65f6\u5019\u8fd8\u662f\u81ea\u5df1\u5f88smart\u7684\u4ece3\u4e2a\u8282\u70b9\u4e2d\u9009\u62e9\u4e00\u4e2a\u6765\u8fde\uff0c\u8fd9\u6837\u4e09\u5907\u4efd\u7684\u65f6\u5019\u6709\u5176\u4e2d\u4e00\u4e2a\u8bf7\u6c42\u662f\u76f4\u63a5\u8bfb\u5199\u672c\u5730\uff0c\u901f\u5ea6\u80af\u5b9a\u6700\u5feb\uff0c\u5bf9\u7cfb\u7edf\u7684\u8d1f\u62c5\u4e5f\u6700\u5c0f\u3002<\/p>\n
\u6240\u4ee5batch\u8fd9\u4e2a\u529f\u80fd\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u662f\u4e0d\u5efa\u8bae\u4f60\u7528\u7684\u2026\u2026\u53ea\u6709\u524d\u9762\u63d0\u5230\u7684\u57fa\u4e8estatic column\u6765\u5b9e\u73b0\u5728\u4e00\u4e2arow\u4e2d\u540c\u65f6\u6210\u4ea4\u8ba2\u5355\u5e76\u4fee\u6539\u4f59\u989d\uff0c\u624d\u6709\u7528batch\u7684\u610f\u4e49\uff0c\u56e0\u4e3aCQL\u7684\u5199\u64cd\u4f5c\u662f\u9488\u5bf9\u4e00\u4e2acolumn\u7684\uff0c\u800cbatch\u53ef\u4ee5\u5408\u5e76\u540c\u4e00\u4e2arow\u7684\u5404\u79cd\u64cd\u4f5c\u53d8\u6210\u4e00\u6b21\u4fdd\u8bc1\u539f\u5b50\u6027+\u9694\u79bb\u6027\u7684\u64cd\u4f5c\u3002\u53e6\u5916\u5b98\u65b9\u4e3e\u7684\u4f59\u989d\u76f8\u5173\u7684\u4f8b\u5b50\u662f\u901a\u8fc7CAS\u6539\u4e00\u4e2a\u666e\u901a\u7684\u6570\u5b57column\u7136\u540elogged batch\u4e00\u4e2arow\u6765\u5b9e\u73b0\u7684\uff0c\u800c\u975ecounter\u4e0a\u76f4\u63a5\u51cf\u53bb\u591a\u5c11\uff0c\u6bd5\u7adf\u4f59\u989d\u8fd9\u73a9\u610f\u4f60\u5f97\u5148\u5224\u65ad\u6709\u624d\u80fd\u6210\u4ea4\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Cassandra\u7684batch\uff0c\u5c31\u662f\u4e00\u6b21\u63d0\u4ea4\u591a\u4e2a\u4fee\u6539\u64cd\u4f5c\uff0c\u8282\u7701\u4f20\u8f93\u8bf7\u6c42\u7684\u8d44\u6e90\u6d88\u8017\u3002\u540c\u65f6\u4e5f\u53ef\u4ee5\u7406\u89e3\u4e3a\u4e00\u79cd\u4e8b\u52a1\u7684\u89e3 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[26],"_links":{"self":[{"href":"https:\/\/yangzhe1991.org\/blog\/wp-json\/wp\/v2\/posts\/224858"}],"collection":[{"href":"https:\/\/yangzhe1991.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yangzhe1991.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yangzhe1991.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yangzhe1991.org\/blog\/wp-json\/wp\/v2\/comments?post=224858"}],"version-history":[{"count":12,"href":"https:\/\/yangzhe1991.org\/blog\/wp-json\/wp\/v2\/posts\/224858\/revisions"}],"predecessor-version":[{"id":224870,"href":"https:\/\/yangzhe1991.org\/blog\/wp-json\/wp\/v2\/posts\/224858\/revisions\/224870"}],"wp:attachment":[{"href":"https:\/\/yangzhe1991.org\/blog\/wp-json\/wp\/v2\/media?parent=224858"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yangzhe1991.org\/blog\/wp-json\/wp\/v2\/categories?post=224858"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yangzhe1991.org\/blog\/wp-json\/wp\/v2\/tags?post=224858"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}