{"id":50154,"date":"2023-07-03T02:46:41","date_gmt":"2023-04-27T01:22:07","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%e8%b7%af%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%a2\/"},"modified":"2024-04-30T11:42:30","modified_gmt":"2024-04-30T03:42:30","slug":"%e3%80%90%e5%8d%a1%e6%a1%91%e5%be%b7%e6%8b%89%e4%b9%8b%e8%b7%af%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%a2","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%e8%b7%af%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%a2\/","title":{"rendered":"\u3010\u5361\u6851\u5fb7\u62c9\u4e4b\u8def\u3011Cassandra \u54cd\u5e94\u5f0f\u7f16\u7a0b\u98ce\u683c~\u9ad8\u7ea7\u4e3b\u9898\u2462 \u4ece\u67e5\u8be2\u5931\u8d25\u5230\u91cd\u8bd5"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<h2>\u4e1c\u4eac\u7684\u5361\u6851\u5fb7\u62c9\u65e5<\/h2>\n<p>\u4eca\u5e742023\u5e746\u67081\u65e5\uff0cCassandra Day\u5c06\u5728\u65e5\u672c\u4e3e\u529e\u3002\u53bb\u5e74\uff0cCassandra Day\u5728\u67cf\u6797\u3001\u4f26\u6566\u3001\u963f\u59c6\u65af\u7279\u4e39\u3001\u6cb3\u5185\u3001\u96c5\u52a0\u8fbe\u3001\u4f11\u65af\u987f\u3001\u5723\u5854\u514b\u62c9\u62c9\u3001\u897f\u96c5\u56fe\u548c\u65b0\u52a0\u5761\u4e5f\u4e3e\u529e\u8fc7\u3002<\/p>\n<p>\u6211\u5011\u5c07\u5728\u6771\u4eac\u8209\u8fa6\u7684\u6d3b\u52d5\u524d\u767c\u8868\u6709\u95dcApache Cassandra\u7684\u6587\u7ae0\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d8fb5913a08637a6da06f\/4-0.png\" alt=\"image.png\" \/><\/div>\n<h2>\u5173\u4e8eApache Cassandra<\/h2>\n<p>Apache Cassandra \u662f\u4e00\u4e2a\u5f00\u6e90\u7684\u5206\u5e03\u5f0f\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u7b80\u800c\u8a00\u4e4b\u3002<\/p>\n<p>\u548c\u5176\u4ed6\u5206\u5e03\u5f0f\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4e00\u6837\uff0c\u53ef\u4ee5\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\u6765\u6ee1\u8db3\u5f00\u53d1\u7b49\u76ee\u7684\uff09\u3002<\/p>\n<p>\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u8df3\u8fc7\u8be6\u7ec6\u7684\u89e3\u91ca\uff0c\u5c06\u4ecb\u7ecd\u7684\u4efb\u52a1\u4ea4\u7ed9\u5bf9\u6b64\u611f\u5174\u8da3\u7684\u4eba\uff0c\u53ef\u4ee5\u53c2\u8003\u5b98\u65b9\u7f51\u7ad9\u6216\u7ef4\u57fa\u767e\u79d1\u3002<\/p>\n<p>&nbsp;<\/p>\n<h1>Cassandra\u53cd\u5e94\u5f0f\u7f16\u7a0b\u98ce\u683c<\/h1>\n<p>\u672c\u6587\u7684\u5185\u5bb9\u662f\u57fa\u4e8e\u4ee5\u4e0b\u6587\u4ef6\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u8bf7\u53c2\u9605\u672c\u6587\u4f5c\u8005\u6240\u5199\u7684\u4ee5\u4e0b\u6587\u7ae0\uff0c\u4ecb\u7ecd\u4e86Cassandra\u53cd\u5e94\u5f0f\u7f16\u7a0b\u7684\u98ce\u683c\u548c\u57fa\u672c\u7528\u6cd5\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2>\u9ad8\u7ea7\u8bdd\u9898<\/h2>\n<h3>\u4ece\u67e5\u8be2\u5931\u8d25\u4e2d\u91cd\u65b0\u5c1d\u8bd5<\/h3>\n<p>\u5728\u54cd\u5e94\u5f0f\u7f16\u7a0b\u4e2d\uff0c\u5982\u679c\u67e5\u8be2\u5931\u8d25\uff0c\u4f1a\u89e6\u53d1onError\u4fe1\u53f7\uff0c\u8ba2\u9605\u4f1a\u7acb\u5373\u7ec8\u6b62\uff0c\u5e76\u4e14\u540e\u7eed\u7684\u67e5\u8be2\u53ef\u80fd\u4e0d\u4f1a\u6267\u884c\u3002<\/p>\n<p>\u5982\u679c\u8fd9\u79cd\u884c\u4e3a\u4e0d\u88ab\u671f\u671b\uff0c\u4f60\u53ef\u4ee5\u6a21\u4eff\u6545\u969c\u5b89\u5168\u7cfb\u7edf\u7684\u8fd0\u4f5c\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528onErrorReturn\u6216\u8005onErrorResume\u7b49\u8fd0\u7b97\u7b26\u6765\u5b9e\u73b0\u3002<\/p>\n<p>\u6bcf\u5f53\u6267\u884c\u5931\u8d25\u65f6\uff0c\u5c06\u5806\u6808\u8ddf\u8e2a\u8f93\u51fa\u5230\u6807\u51c6\u9519\u8bef\u3002\u7531\u4e8e\u5b58\u5728onErrorResume\u8fd0\u7b97\u7b26\uff0c\u9519\u8bef\u5c06\u88ab\u5ffd\u7565\uff0c\u6d41\u7a0b\u5c06\u4f1a\u7ee7\u7eed\u6267\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">Flux<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Statement<\/span><span class=\"o\">&lt;?&gt;&gt;<\/span> <span class=\"n\">stmts<\/span> <span class=\"o\">=<\/span> <span class=\"o\">...;<\/span>\r\n<span class=\"n\">stmts<\/span><span class=\"o\">.<\/span><span class=\"na\">flatMap<\/span><span class=\"o\">(<\/span>\r\n    <span class=\"n\">statement<\/span> <span class=\"o\">-&gt;<\/span>\r\n        <span class=\"nc\">Flux<\/span><span class=\"o\">.<\/span><span class=\"na\">from<\/span><span class=\"o\">(<\/span><span class=\"n\">session<\/span><span class=\"o\">.<\/span><span class=\"na\">executeReactive<\/span><span class=\"o\">(<\/span><span class=\"n\">statement<\/span><span class=\"o\">))<\/span>\r\n            <span class=\"o\">.<\/span><span class=\"na\">doOnError<\/span><span class=\"o\">(<\/span><span class=\"nl\">Throwable:<\/span><span class=\"o\">:<\/span><span class=\"n\">printStackTrace<\/span><span class=\"o\">)<\/span>\r\n            <span class=\"o\">.<\/span><span class=\"na\">onErrorResume<\/span><span class=\"o\">(<\/span><span class=\"n\">error<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"nc\">Mono<\/span><span class=\"o\">.<\/span><span class=\"na\">empty<\/span><span class=\"o\">()))<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"na\">blockLast<\/span><span class=\"o\">();<\/span>\r\n<\/code><\/pre>\n<p>\u770b\u4e00\u773c\u5c31\u80fd\u660e\u767d\uff0c\u4e0a\u8ff0\u7684\u5b9e\u73b0\u8fc7\u4e8e\u7b80\u5355\u4e86\u3002<\/p>\n<p>\u4ee5\u4e0b\u7684\u4f8b\u5b50\u662f\u524d\u4e00\u500b\u4f8b\u5b50\u7684\u64f4\u5c55\u3002\u6bcf\u6b21\u5931\u6557\u7684\u57f7\u884c\uff0c\u5982\u679c\u932f\u8aa4\u662fUnavailableException\uff0c\u5c07\u9032\u884c\u6700\u591a3\u6b21\u7684\u91cd\u8a66\uff0c\u5982\u679c\u91cd\u8a66\u5f8c\u67e5\u8a62\u4ecd\u672a\u6210\u529f\uff0c\u5247\u5c07\u8a0a\u606f\u8a18\u9304\u5728\u65e5\u8a8c\u4e2d\u3002\u6700\u5f8c\uff0c\u5c07\u6536\u96c6\u6240\u6709\u932f\u8aa4\uff0c\u4e26\u5c07\u5931\u6557\u7684\u67e5\u8a62\u7e3d\u6578\u8f38\u51fa\u5230\u63a7\u5236\u53f0\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">Flux<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Statement<\/span><span class=\"o\">&lt;?&gt;&gt;<\/span> <span class=\"n\">statements<\/span> <span class=\"o\">=<\/span> <span class=\"o\">...;<\/span>\r\n<span class=\"kt\">long<\/span> <span class=\"n\">failed<\/span> <span class=\"o\">=<\/span> <span class=\"n\">statements<\/span><span class=\"o\">.<\/span><span class=\"na\">flatMap<\/span><span class=\"o\">(<\/span>\r\n    <span class=\"n\">stmt<\/span> <span class=\"o\">-&gt;<\/span>\r\n        <span class=\"nc\">Flux<\/span><span class=\"o\">.<\/span><span class=\"na\">defer<\/span><span class=\"o\">(()<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">session<\/span><span class=\"o\">.<\/span><span class=\"na\">executeReactive<\/span><span class=\"o\">(<\/span><span class=\"n\">stmt<\/span><span class=\"o\">))<\/span>\r\n            <span class=\"c1\">\/\/ retry at most 3 times on Unavailable<\/span>\r\n            <span class=\"o\">.<\/span><span class=\"na\">retry<\/span><span class=\"o\">(<\/span><span class=\"mi\">3<\/span><span class=\"o\">,<\/span> <span class=\"nc\">UnavailableException<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">::<\/span><span class=\"n\">isInstance<\/span><span class=\"o\">)<\/span>\r\n            <span class=\"c1\">\/\/ handle errors<\/span>\r\n            <span class=\"o\">.<\/span><span class=\"na\">doOnError<\/span><span class=\"o\">(<\/span>\r\n                <span class=\"n\">error<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"o\">{<\/span>\r\n                  <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">err<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Statement failed: \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">stmt<\/span><span class=\"o\">);<\/span>\r\n                  <span class=\"n\">error<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n                <span class=\"o\">})<\/span>\r\n            <span class=\"c1\">\/\/ Collect errors and discard all returned rows<\/span>\r\n            <span class=\"o\">.<\/span><span class=\"na\">ignoreElements<\/span><span class=\"o\">()<\/span>\r\n            <span class=\"o\">.<\/span><span class=\"na\">cast<\/span><span class=\"o\">(<\/span><span class=\"nc\">Long<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">)<\/span>\r\n            <span class=\"o\">.<\/span><span class=\"na\">onErrorReturn<\/span><span class=\"o\">(<\/span><span class=\"mi\">1L<\/span><span class=\"o\">))<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"na\">sum<\/span><span class=\"o\">()<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"na\">block<\/span><span class=\"o\">();<\/span>\r\n<span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Total failed queries: \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">failed<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528Flux.defer()\u6765\u5305\u88c5\u5bf9session.executeReactive()\u7684\u8c03\u7528\u3002<br \/>\n\u8fd9\u662f\u56e0\u4e3a\u9a71\u52a8\u7a0b\u5e8f\u59cb\u7ec8\u9700\u8981\u521b\u5efa\u53ea\u6709\u5355\u4e2a\u8ba2\u9605\u7684\u53d1\u5e03\u8005\uff0c\u6240\u4ee5\u8fd9\u662f\u5fc5\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u4e0d\u4f7f\u7528defer\u8fd0\u7b97\u7b26\uff0c\u652f\u6301\u4ec5\u9650\u4e8e\u8fd9\u79cd\u5355\u4e2a\u8ba2\u9605\u7684\u53d1\u5e03\u8005\u5c06\u4e0eretry\u7b49\u8fd0\u7b97\u7b26\u4e0d\u517c\u5bb9\u3002\u8fd9\u662f\u56e0\u4e3a\u8fd9\u4e9b\u8fd0\u7b97\u7b26\u53ef\u80fd\u4f1a\u591a\u6b21\u5411\u4e0a\u6e38\u53d1\u5e03\u8005\u8ba2\u9605\uff0c\u5e76\u4e14\u5728\u9a71\u52a8\u7a0b\u5e8f\u629b\u51fa\u5f02\u5e38\u7684\u60c5\u51b5\u4e0b\u3002\u8fd9\u6b63\u662fdefer\u8fd0\u7b97\u7b26\u8bbe\u8ba1\u7684\u76ee\u7684\u3002\u5bf9defer\u8fd0\u7b97\u7b26\u7684\u6bcf\u4e2a\u8ba2\u9605\u5c06\u89e6\u53d1\u5bf9session.executeReactive()\u7684\u5355\u72ec\u8c03\u7528\uff0c\u5e76\u5728\u4f1a\u8bdd\u91cd\u65b0\u6267\u884c\u548c\u91cd\u8bd5\u67e5\u8be2\u65f6\u8fd4\u56de\u65b0\u7684\u53d1\u5e03\u8005\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u4e1c\u4eac\u7684\u5361\u6851\u5fb7\u62c9\u65e5 \u4eca\u5e742023\u5e746\u67081\u65e5\uff0cCassandra Day\u5c06\u5728\u65e5\u672c\u4e3e\u529e\u3002\u53bb\u5e74\uff0cCassandr [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-50154","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u3010\u5361\u6851\u5fb7\u62c9\u4e4b\u8def\u3011Cassandra \u54cd\u5e94\u5f0f\u7f16\u7a0b\u98ce\u683c~\u9ad8\u7ea7\u4e3b\u9898\u2462 \u4ece\u67e5\u8be2\u5931\u8d25\u5230\u91cd\u8bd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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