{"id":194121,"date":"2024-11-13T03:56:19","date_gmt":"2024-11-12T19:56:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/194121\/"},"modified":"2024-11-13T03:56:20","modified_gmt":"2024-11-12T19:56:20","slug":"%e4%b8%80%e7%af%87%e5%ad%b8%e6%9c%83hive-sql%e5%8f%83%e6%95%b8%e8%88%87%e6%80%a7%e8%83%bd%e8%aa%bf%e5%84%aa","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/194121\/","title":{"rendered":"\u4e00\u7bc7\u5b78\u6703Hive SQL\u53c3\u6578\u8207\u6027\u80fd\u8abf\u512a"},"content":{"rendered":"<h1 id=\"%e4%b8%80%e7%af%87%e5%ad%b8%e6%9c%83hive-sql%e5%8f%83%e6%95%b8%e8%88%87%e6%80%a7%e8%83%bd%e8%aa%bf%e5%84%aa-KMOxOHIWUz\">\u4e00\u7bc7\u5b78\u6703Hive SQL\u53c3\u6578\u8207\u6027\u80fd\u8abf\u512a<\/h1>\n<p>\u5728\u5927\u6578\u64da\u8655\u7406\u7684\u9818\u57df\u4e2d\uff0cHive SQL\u4f5c\u70ba\u4e00\u7a2e\u9ad8\u7d1a\u67e5\u8a62\u8a9e\u8a00\uff0c\u70ba\u7528\u6236\u63d0\u4f9b\u4e86\u985e\u4f3c\u65bcSQL\u7684\u67e5\u8a62\u65b9\u5f0f\uff0c\u65b9\u4fbf\u7528\u6236\u5728Hadoop\u751f\u614b\u7cfb\u7d71\u4e2d\u9032\u884c\u6578\u64da\u5206\u6790\u3002\u7136\u800c\uff0c\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u5982\u4f55\u6709\u6548\u5730\u8abf\u512aHive SQL\u7684\u6027\u80fd\u6210\u70ba\u4e86\u8a31\u591a\u6578\u64da\u5de5\u7a0b\u5e2b\u548c\u5206\u6790\u5e2b\u9762\u81e8\u7684\u91cd\u8981\u6311\u6230\u3002\u672c\u6587\u5c07\u63a2\u8a0eHive SQL\u7684\u53c3\u6578\u8a2d\u7f6e\u53ca\u6027\u80fd\u8abf\u512a\u7684\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<h2 id=\"hive-sql%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-KMOxOHIWUz\">Hive SQL\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>Hive\u662f\u4e00\u500b\u57fa\u65bcHadoop\u7684\u6578\u64da\u5009\u5eab\u5de5\u5177\uff0c\u5141\u8a31\u7528\u6236\u4f7f\u7528\u985e\u4f3cSQL\u7684\u8a9e\u8a00\u4f86\u67e5\u8a62\u548c\u7ba1\u7406\u5927\u6578\u64da\u3002Hive\u5c07\u67e5\u8a62\u8f49\u63db\u70baMapReduce\u4f5c\u696d\uff0c\u4e26\u5728Hadoop\u96c6\u7fa4\u4e0a\u57f7\u884c\u3002\u9019\u4f7f\u5f97Hive\u975e\u5e38\u9069\u5408\u8655\u7406\u5927\u898f\u6a21\u7684\u6578\u64da\u96c6\u3002<\/p>\n<h2 id=\"hive-sql%e7%9a%84%e5%8f%83%e6%95%b8%e8%a8%ad%e7%bd%ae-KMOxOHIWUz\">Hive SQL\u7684\u53c3\u6578\u8a2d\u7f6e<\/h2>\n<p>\u5728\u4f7f\u7528Hive\u9032\u884c\u67e5\u8a62\u6642\uff0c\u9069\u7576\u7684\u53c3\u6578\u8a2d\u7f6e\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u95dc\u9375\u7684Hive\u53c3\u6578\u53ca\u5176\u4f5c\u7528\uff1a<\/p>\n<ul>\n<li><code>hive.exec.parallel<\/code>: \u8a2d\u7f6e\u70batrue\u53ef\u4ee5\u555f\u7528\u4e26\u884c\u57f7\u884c\u67e5\u8a62\uff0c\u9019\u5c0d\u65bc\u591a\u500b\u7368\u7acb\u7684\u67e5\u8a62\u975e\u5e38\u6709\u6548\u3002<\/li>\n<li><code>hive.exec.reducers.bytes.per.reducer<\/code>: \u6b64\u53c3\u6578\u63a7\u5236\u6bcf\u500bReducer\u8655\u7406\u7684\u6578\u64da\u91cf\uff0c\u9069\u7576\u8abf\u6574\u53ef\u4ee5\u907f\u514dReducer\u904e\u8f09\u3002<\/li>\n<li><code>hive.exec.dynamic.partition.mode<\/code>: \u8a2d\u7f6e\u70bastrict\u53ef\u4ee5\u5f37\u5236\u4f7f\u7528\u52d5\u614b\u5206\u5340\uff0c\u9019\u5c0d\u65bc\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u975e\u5e38\u6709\u5e6b\u52a9\u3002<\/li>\n<li><code>hive.auto.convert.join<\/code>: \u8a2d\u7f6e\u70batrue\u53ef\u4ee5\u81ea\u52d5\u5c07\u5c0f\u8868\u8f49\u63db\u70baMapJoin\uff0c\u5f9e\u800c\u63d0\u9ad8JOIN\u64cd\u4f5c\u7684\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%80%a7%e8%83%bd%e8%aa%bf%e5%84%aa%e7%9a%84%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-KMOxOHIWUz\">\u6027\u80fd\u8abf\u512a\u7684\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u9664\u4e86\u53c3\u6578\u8a2d\u7f6e\u5916\uff0c\u9084\u6709\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u512a\u5316Hive SQL\u7684\u6027\u80fd\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e5%90%88%e9%81%a9%e7%9a%84%e6%96%87%e4%bb%b6%e6%a0%bc%e5%bc%8f-KMOxOHIWUz\">1. \u4f7f\u7528\u5408\u9069\u7684\u6587\u4ef6\u683c\u5f0f<\/h3>\n<p>\u9078\u64c7\u5408\u9069\u7684\u6587\u4ef6\u683c\u5f0f\u5c0d\u65bc\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002Parquet\u548cORC\u683c\u5f0f\u901a\u5e38\u6bd4\u6587\u672c\u683c\u5f0f\u66f4\u9ad8\u6548\uff0c\u56e0\u70ba\u5b83\u5011\u652f\u6301\u5217\u5f0f\u5b58\u5132\u548c\u58d3\u7e2e\uff0c\u80fd\u5920\u6e1b\u5c11I\/O\u64cd\u4f5c\u3002<\/p>\n<h3 id=\"2-%e5%88%86%e5%8d%80%e5%92%8c%e5%88%86%e6%a1%b6-KMOxOHIWUz\">2. \u5206\u5340\u548c\u5206\u6876<\/h3>\n<p>\u901a\u904e\u5c0d\u8868\u9032\u884c\u5206\u5340\u548c\u5206\u6876\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u5206\u5340\u53ef\u4ee5\u6839\u64da\u67d0\u500b\u5217\u7684\u503c\u5c07\u6578\u64da\u5206\u958b\u5b58\u5132\uff0c\u800c\u5206\u6876\u5247\u662f\u5c07\u6578\u64da\u6839\u64da\u54c8\u5e0c\u503c\u5206\u6563\u5230\u4e0d\u540c\u7684\u6876\u4e2d\u3002\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6383\u63cf\u7684\u6578\u64da\u91cf\u3002<\/p>\n<h3 id=\"3-%e9%81%a9%e7%95%b6%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-KMOxOHIWUz\">3. \u9069\u7576\u4f7f\u7528\u7d22\u5f15<\/h3>\n<p>\u5728Hive\u4e2d\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u52a0\u901f\u67e5\u8a62\uff0c\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u7d22\u5f15\u7684\u7dad\u8b77\u6703\u589e\u52a0\u5beb\u5165\u7684\u958b\u92b7\u3002\u56e0\u6b64\uff0c\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u4f86\u6c7a\u5b9a\u662f\u5426\u4f7f\u7528\u7d22\u5f15\u3002<\/p>\n<h3 id=\"4-%e5%84%aa%e5%8c%96%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-KMOxOHIWUz\">4. \u512a\u5316\u67e5\u8a62\u8a9e\u53e5<\/h3>\n<p>\u7de8\u5beb\u9ad8\u6548\u7684\u67e5\u8a62\u8a9e\u53e5\u662f\u6027\u80fd\u8abf\u512a\u7684\u95dc\u9375\u3002\u907f\u514d\u4f7f\u7528SELECT *\uff0c\u800c\u662f\u660e\u78ba\u6307\u5b9a\u9700\u8981\u7684\u5217\uff1b\u4f7f\u7528WHERE\u5b50\u53e5\u904e\u6ffe\u4e0d\u5fc5\u8981\u7684\u6578\u64da\uff1b\u5408\u7406\u4f7f\u7528JOIN\u64cd\u4f5c\uff0c\u76e1\u91cf\u6e1b\u5c11JOIN\u7684\u6578\u91cf\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-KMOxOHIWUz\">\u7d50\u8ad6<\/h2>\n<p>Hive SQL\u7684\u6027\u80fd\u8abf\u512a\u662f\u4e00\u500b\u7d9c\u5408\u6027\u7684\u5de5\u4f5c\uff0c\u6d89\u53ca\u5230\u53c3\u6578\u8a2d\u7f6e\u3001\u6578\u64da\u5b58\u5132\u683c\u5f0f\u3001\u67e5\u8a62\u512a\u5316\u7b49\u591a\u500b\u65b9\u9762\u3002\u901a\u904e\u5408\u7406\u7684\u914d\u7f6e\u548c\u6700\u4f73\u5be6\u8e10\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8Hive\u7684\u67e5\u8a62\u6027\u80fd\uff0c\u5f9e\u800c\u66f4\u9ad8\u6548\u5730\u8655\u7406\u5927\u6578\u64da\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u652f\u6301\u60a8\u7684Hive SQL\u67e5\u8a62\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u6578\u64da\u5206\u6790\u63d0\u4f9b\u7a69\u5b9a\u7684\u57fa\u790e\u8a2d\u65bd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u6703Hive SQL\u53c3\u6578\u8207\u6027\u80fd\u8abf\u512a\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u6578\u64da\u8655\u7406\uff0c\u5be6\u73fe\u66f4\u5feb\u7684\u6578\u64da\u5206\u6790\u8207\u5831\u544a\u751f\u6210\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-194121","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/194121","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=194121"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/194121\/revisions"}],"predecessor-version":[{"id":194122,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/194121\/revisions\/194122"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=194121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=194121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=194121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}