{"id":50234,"date":"2023-04-19T11:25:25","date_gmt":"2024-01-08T09:42:42","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90%e5%8d%a1%e6%a1%91%e5%be%b7%e6%8b%89%e4%b9%8b%e6%97%85%e3%80%91cassandra%e5%93%8d%e5%ba%94%e5%bc%8f%e7%bc%96%e7%a8%8b%e9%a3%8e%e6%a0%bc%e9%ab%98%e7%ba%a7%e4%b8%bb%e9%a2%98%e2%91%a1%e6%9f%a5\/"},"modified":"2024-04-30T00:13:11","modified_gmt":"2024-04-29T16:13:11","slug":"%e3%80%90%e5%8d%a1%e6%a1%91%e5%be%b7%e6%8b%89%e4%b9%8b%e6%97%85%e3%80%91cassandra%e5%93%8d%e5%ba%94%e5%bc%8f%e7%bc%96%e7%a8%8b%e9%a3%8e%e6%a0%bc%e9%ab%98%e7%ba%a7%e4%b8%bb%e9%a2%98%e2%91%a1%e6%9f%a5","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90%e5%8d%a1%e6%a1%91%e5%be%b7%e6%8b%89%e4%b9%8b%e6%97%85%e3%80%91cassandra%e5%93%8d%e5%ba%94%e5%bc%8f%e7%bc%96%e7%a8%8b%e9%a3%8e%e6%a0%bc%e9%ab%98%e7%ba%a7%e4%b8%bb%e9%a2%98%e2%91%a1%e6%9f%a5\/","title":{"rendered":"\u3010\u5361\u6851\u5fb7\u62c9\u4e4b\u65c5\u3011Cassandra\u54cd\u5e94\u5f0f\u7f16\u7a0b\u98ce\u683c~\u9ad8\u7ea7\u4e3b\u9898\u2461\u67e5\u8be2\u7ed3\u679c\u7684\u7f13\u5b58"},"content":{"rendered":"

\u9996\u5148<\/h1>\n

\u4e1c\u4eac\u7684\u5361\u6851\u5fb7\u62c9\u65e5<\/h2>\n

\u4eca\u5e74\uff0c\u4e2d\u56fd\u4e5f\u5c06\u4e8e2023\u5e746\u67081\u65e5\u4e3e\u529eCassandra Day\u3002Cassandra Day\u53bb\u5e74\u66fe\u5728\u67cf\u6797\u3001\u4f26\u6566\u3001\u963f\u59c6\u65af\u7279\u4e39\u3001\u6cb3\u5185\u3001\u96c5\u52a0\u8fbe\u3001\u4f11\u65af\u6566\u3001\u5723\u5854\u514b\u62c9\u62c9\u3001\u897f\u96c5\u56fe\u548c\u65b0\u52a0\u5761\u4e3e\u529e\u3002<\/p>\n

\u4e3a\u4e86\u672c\u6b21\u5728\u4e1c\u4eac\u7684\u4e3e\u529e\uff0c\u6211\u4eec\u5c06\u9646\u7eed\u53d1\u5e03\u5173\u4e8eApache Cassandra\u7684\u6587\u7ae0\u3002<\/p>\n

\"image.png\"<\/div>\n

\u5173\u4e8eApache Cassandra<\/h2>\n

\u5982\u679c\u7528\u4e00\u53e5\u8bdd\u6765\u8bf4\uff0cApache Cassandra \u662f\u4e00\u4e2a\u5f00\u6e90\u5206\u5e03\u5f0f\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u3002<\/p>\n

\u548c\u5176\u4ed6\u5206\u5e03\u5f0f\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4e00\u6837\uff0c\u4f7f\u7528\u591a\u4e2a\u901a\u7528\u670d\u52a1\u5668\u6765\u6784\u5efa\u4e00\u4e2a\u6570\u636e\u5e93\uff08\u4e5f\u53ef\u4ee5\u4ec5\u4f7f\u7528\u4e00\u4e2a\u670d\u52a1\u5668\u8fdb\u884c\u6784\u5efa\uff0c\u7528\u4e8e\u5f00\u53d1\u7b49\u76ee\u7684\uff09\u3002<\/p>\n

\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u7701\u7565\u8be6\u7ec6\u8bf4\u660e\uff0c\u5c06\u4ecb\u7ecd\u611f\u5174\u8da3\u7684\u4eba\u7684\u4efb\u52a1\u4ea4\u7ed9\u5b98\u65b9\u7f51\u7ad9\u548c\u7ef4\u57fa\u767e\u79d1\u3002<\/p>\n

 <\/p>\n

Cassandra \u53cd\u5e94\u5f0f\u7f16\u7a0b\u98ce\u683c<\/h1>\n

\u8fd9\u7bc7\u7a3f\u4ef6\u7684\u5185\u5bb9\u662f\u6839\u636e\u4ee5\u4e0b\u6587\u4ef6\u7f16\u5199\u7684\u3002<\/p>\n

 <\/p>\n

\u8bf7\u53c2\u9605\u672c\u6587\u4f5c\u8005\u5bf9\u4e8eCassandra\u54cd\u5e94\u5f0f\u7f16\u7a0b\u98ce\u683c\u7684\u4ecb\u7ecd\u548c\u57fa\u672c\u7528\u6cd5\u7684\u76f8\u5173\u6587\u7ae0\u3002<\/p>\n

 <\/p>\n

\u6df1\u5165\u7684\u8bdd\u9898<\/h2>\n

\u67e5\u8be2\u7ed3\u679c\u7684\u7f13\u5b58<\/h3>\n

\u53ea\u80fd\u8ba2\u9605\u4e00\u6b21ReactiveResultSet\u3002\u8fd9\u662f\u51fa\u4e8e\u8bbe\u8ba1\u4e0a\u7684\u6545\u610f\u51b3\u5b9a\u3002\u5426\u5219\uff0c\u5f53\u7528\u6237\u8ba2\u9605\u540c\u4e00\u67e5\u8be2\u7684\u7b2c\u4e8c\u6b21\u65f6\uff0c\u53ef\u80fd\u4f1a\u89e6\u53d1\u4e0e\u7528\u6237\u610f\u56fe\u4e0d\u7b26\u7684\u4e0d\u540c\u6267\u884c\uff0c\u4e0e\u7b2c\u4e00\u6b21\u8ba2\u9605\u540c\u4e00\u67e5\u8be2\u7684\u6267\u884c\u4e0d\u540c\u3002<\/p>\n

\u6211\u60f3\u8ba1\u7b97\u8868\u683c\u5217\u6240\u6709\u503c\u7684\u5e73\u5747\u503c\u548c\u603b\u548c\u3002\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u521b\u5efa\u4e24\u4e2a\u6d41\uff0c\u540c\u65f6\u8ba2\u9605\u5b83\u4eec\u3002<\/p>\n

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\/\/ DON'T DO THIS<\/span>\r\nReactiveResultSet<\/span> rs<\/span> =<\/span> session<\/span>.<\/span>executeReactive<\/span>(<\/span>\"SELECT n FROM ...\"<\/span>);<\/span>\r\ndouble<\/span> avg<\/span> =<\/span> Flux<\/span>.<\/span>from<\/span>(<\/span>rs<\/span>)<\/span>\r\n    .<\/span>map<\/span>(<\/span>row<\/span> -><\/span> row<\/span>.<\/span>getLong<\/span>(<\/span>0<\/span>))<\/span>\r\n    .<\/span>reduce<\/span>(<\/span>0<\/span>d<\/span>,<\/span> (<\/span>a<\/span>,<\/span> b<\/span>)<\/span> -><\/span> (<\/span>a<\/span> +<\/span> b<\/span> \/<\/span> 2.0<\/span>))<\/span>\r\n    .<\/span>block<\/span>();<\/span>\r\n\/\/ will fail with IllegalStateException<\/span>\r\nlong<\/span> sum<\/span> =<\/span> Flux<\/span>.<\/span>from<\/span>(<\/span>rs<\/span>)<\/span>\r\n    .<\/span>map<\/span>(<\/span>row<\/span> -><\/span> row<\/span>.<\/span>getLong<\/span>(<\/span>0<\/span>))<\/span>\r\n    .<\/span>reduce<\/span>(<\/span>0L<\/span>,<\/span> (<\/span>a<\/span>,<\/span> b<\/span>)<\/span> -><\/span> a<\/span> +<\/span> b<\/span>)<\/span>\r\n    .<\/span>block<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u56e0\u4e3a rs \u5df2\u7ecf\u88ab\u8ba2\u9605\uff0c\u6240\u4ee5\u4e0a\u8ff0\u7684\u7b2c\u4e8c\u4e2a Flux \u5728 onError \u4fe1\u53f7\u4e2d\u7acb\u523b\u7ed3\u675f\uff0c\u5e76\u5c01\u88c5\u4e86 IllegalStateException\u3002<\/p>\n
\u907f\u514d\u4e24\u6b21\u67e5\u8be2\u8868\u683c\uff0c\u5e76\u4e14\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u5927\u591a\u6570\u54cd\u5e94\u5f0f\u5e93\u63d0\u4f9b\u7684\u7f13\u5b58\u6765\u907f\u514d\u6b64\u9650\u5236\u3002<\/p>\n
Flux<\/span><<\/span>Long<\/span>><\/span> rs<\/span> =<\/span> Flux<\/span>.<\/span>from<\/span>(<\/span>session<\/span>.<\/span>executeReactive<\/span>(<\/span>\"SELECT n FROM ...\"<\/span>))<\/span>\r\n    .<\/span>map<\/span>(<\/span>row<\/span> -><\/span> row<\/span>.<\/span>getLong<\/span>(<\/span>0<\/span>))<\/span>\r\n    .<\/span>cache<\/span>();<\/span>\r\ndouble<\/span> avg<\/span> =<\/span> rs<\/span>\r\n    .<\/span>reduce<\/span>(<\/span>0<\/span>d<\/span>,<\/span> (<\/span>a<\/span>,<\/span> b<\/span>)<\/span> -><\/span> (<\/span>a<\/span> +<\/span> b<\/span> \/<\/span> 2.0<\/span>))<\/span>\r\n    .<\/span>block<\/span>();<\/span>\r\nlong<\/span> sum<\/span> =<\/span> rs<\/span>\r\n    .<\/span>reduce<\/span>(<\/span>0L<\/span>,<\/span> (<\/span>a<\/span>,<\/span> b<\/span>)<\/span> -><\/span> a<\/span> +<\/span> b<\/span>)<\/span>\r\n    .<\/span>block<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u4ee5\u4e0a\u7684\u4ee3\u7801\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c\u3002<\/p>\n
\u64cd\u4f5c\u5458cache\u53ea\u4f1a\u5bf9ReactiveResultSet\u8fdb\u884c\u4e00\u6b21\u8ba2\u9605\uff0c\u5e76\u7f13\u5b58\u7ed3\u679c\uff0c\u7136\u540e\u5c06\u7f13\u5b58\u7684\u7ed3\u679c\u63d0\u4f9b\u7ed9\u4e0b\u6e38\u8ba2\u9605\u8005\u3002<\/p>\n
\u53ea\u6709\u5f53\u7ed3\u679c\u96c6\u8f83\u5c0f\u5e76\u4e14\u53ef\u4ee5\u88c5\u5165\u5185\u5b58\u65f6\uff0c\u624d\u53ef\u80fd\u5b9e\u73b0\u3002<\/p>\n
\u5982\u679c\u65e0\u6cd5\u91c7\u7528\u7f13\u5b58\u7b56\u7565\uff0c\u5927\u591a\u6570\u53cd\u5e94\u5f0f\u5e93\u8fd8\u63d0\u4f9b\u4e86\u4e00\u79cd\u5728\u8fd0\u884c\u65f6\u5c06\u4e0a\u6e38\u8ba2\u9605\u591a\u4e2a\u8ba2\u9605\u8005\u7684\u64cd\u4f5c\u7b26\u8fdb\u884c\u591a\u64ad\u7684\u65b9\u5f0f\u3002<\/p>\n
\u4ee5\u4e0b\u7684\u4f8b\u5b50\u53ef\u4ee5\u7528\u53e6\u4e00\u79cd\u65b9\u6cd5\u8fdb\u884c\u91cd\u65b0\u5199\u4f5c\u3002<\/p>\n
Flux<\/span><<\/span>Long<\/span>><\/span> rs<\/span> =<\/span> Flux<\/span>.<\/span>from<\/span>(<\/span>session<\/span>.<\/span>executeReactive<\/span>(<\/span>\"SELECT n FROM ...\"<\/span>))<\/span>\r\n    .<\/span>map<\/span>(<\/span>row<\/span> -><\/span> row<\/span>.<\/span>getLong<\/span>(<\/span>0<\/span>))<\/span>\r\n    .<\/span>publish<\/span>()<\/span>       \/\/ multicast upstream to all downstream subscribers<\/span>\r\n    .<\/span>autoConnect<\/span>(<\/span>2<\/span>);<\/span> \/\/ wait until two subscribers subscribe<\/span>\r\nlong<\/span> sum<\/span> =<\/span> rs<\/span>\r\n    .<\/span>reduce<\/span>(<\/span>0L<\/span>,<\/span> (<\/span>a<\/span>,<\/span> b<\/span>)<\/span> -><\/span> a<\/span> +<\/span> b<\/span>)<\/span>\r\n    .<\/span>block<\/span>();<\/span>\r\ndouble<\/span> avg<\/span> =<\/span> rs<\/span>\r\n    .<\/span>reduce<\/span>(<\/span>0<\/span>d<\/span>,<\/span> (<\/span>a<\/span>,<\/span> b<\/span>)<\/span> -><\/span> (<\/span>a<\/span> +<\/span> b<\/span> \/<\/span> 2.0<\/span>))<\/span>\r\n    .<\/span>block<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0cpublish\u64cd\u4f5c\u7b26\u5c06\u6240\u6709\u7684onNext\u4fe1\u53f7\u5e7f\u64ad\u7ed9\u6240\u6709\u7684\u8ba2\u9605\u8005\u3002autoConnect(2)\u64cd\u4f5c\u7b26\u544a\u8bc9publish\u5728\u8ba2\u9605\u4e0a\u6e38\u6e90\uff08\u5e76\u89e6\u53d1\u5b9e\u9645\u7684\u67e5\u8be2\u6267\u884c\uff09\u4e4b\u524d\u7b49\u5f85\u83b7\u53d6\u4e24\u4e2a\u8ba2\u9605\u3002<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u5927\u89c4\u6a21\u7ed3\u679c\u96c6\uff0c\u56e0\u4e3a\u5b83\u4e0d\u9700\u8981\u5c06\u7ed3\u679c\u7f13\u5b58\u5230\u5185\u5b58\u4e2d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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