{"id":50536,"date":"2023-08-24T00:34:33","date_gmt":"2023-03-02T08:10:36","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/spark%e7%9a%84%e5%88%86%e5%8c%ba\/"},"modified":"2024-04-30T19:50:18","modified_gmt":"2024-04-30T11:50:18","slug":"spark%e7%9a%84%e5%88%86%e5%8c%ba","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/spark%e7%9a%84%e5%88%86%e5%8c%ba\/","title":{"rendered":"Spark\u7684\u5206\u533a"},"content":{"rendered":"

Spark\u5206\u533a – \u535a\u5ba2 | luminousmen\u7ffb\u8bd1\u3002<\/p>\n

\u9019\u672c\u66f8\u662f\u6458\u8b6f\u7248\u672c\uff0c\u7121\u6cd5\u4fdd\u8b49\u5176\u6e96\u78ba\u6027\u3002\u8acb\u53c3\u8003\u539f\u6587\u4ee5\u7372\u5f97\u6b63\u78ba\u7684\u5167\u5bb9\u3002<\/div>\n

Spark\u662f\u4e00\u4e2a\u7528\u4e8e\u5728\u96c6\u7fa4\u4e2d\u5e76\u884c\u5904\u7406\u6570\u636e\u7684\u5f15\u64ce\u3002\u901a\u8fc7Apache Spark\u7684\u5e76\u884c\u6027\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u5728\u6570\u767e\u53f0\u673a\u5668\u7684\u96c6\u7fa4\u4e0a\u5e76\u884c\u4e14\u72ec\u7acb\u5730\u6267\u884c\u4efb\u52a1\u3002\u8fd9\u5168\u90e8\u90fd\u662f\u57fa\u4e8eApache Spark\u7684RDD\u57fa\u672c\u6982\u5ff5\u5b9e\u73b0\u7684\u3002<\/p>\n

\u5728\u5185\u90e8\uff0c\u8fd9\u4e9bRDD\u4ee5\u4e0d\u540c\u7684\u96c6\u7fa4\u8282\u70b9\u5206\u533a\u7684\u5f62\u5f0f\u5b58\u50a8\u3002\u5206\u533a\u57fa\u672c\u4e0a\u662f\u5927\u89c4\u6a21\u5206\u5e03\u5f0f\u6570\u636e\u96c6\u7684\u903b\u8f91\u5757\u3002\u8fd9\u4f7f\u5f97\u5de5\u4f5c\u5728\u96c6\u7fa4\u4e4b\u95f4\u5206\u914d\uff0c\u5e76\u5c06\u4efb\u52a1\u5206\u89e3\u4e3a\u66f4\u5c0f\u7684\u90e8\u5206\uff0c\u4ece\u800c\u51cf\u5c11\u6bcf\u4e2a\u8282\u70b9\u7684\u5185\u5b58\u9700\u6c42\u3002\u5206\u533a\u662fApache Spark\u4e2d\u5e76\u884c\u6027\u7684\u4e3b\u8981\u5355\u4f4d\u3002<\/p>\n

\u6211\u4eec\u6765\u8c08\u8c08\u5173\u4e8e\u5206\u533a\u7684\u4e8b\u60c5\u3002<\/h1>\n
\"spark-partitions-2.jpeg\"<\/div>\n

\u5373\u4f7f\u5728\u610f\u8bc6\u4e0d\u5230\u5206\u533a\u7684\u8fb9\u754c\u65f6\u4ecd\u4f1a\u4f7f\u7528\u5206\u533a\uff0c\u4f46\u901a\u8fc7\u64cd\u4f5c\u5b83\u4eec\u53ef\u4ee5\u52a0\u5feb\u6570\u636e\u5904\u7406\u901f\u5ea6\u3002<\/p>\n

\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u5185\u90e8\u53d1\u751f\u4e86\u4ec0\u4e48\u3002<\/p>\n

import<\/span> pandas<\/span> as<\/span> pd<\/span>\r\nimport<\/span> numpy<\/span> as<\/span> np<\/span>\r\n\r\nlength<\/span> =<\/span> 100<\/span>\r\nnames<\/span> =<\/span> np<\/span>.<\/span>random<\/span>.<\/span>choice<\/span>([<\/span>'<\/span>Bob<\/span>'<\/span>,<\/span> '<\/span>James<\/span>'<\/span>,<\/span> '<\/span>Marek<\/span>'<\/span>,<\/span> '<\/span>Johannes<\/span>'<\/span>,<\/span> None<\/span>],<\/span> length<\/span>)<\/span>\r\namounts<\/span> =<\/span> np<\/span>.<\/span>random<\/span>.<\/span>randint<\/span>(<\/span>0<\/span>,<\/span> 1000000<\/span>,<\/span> length<\/span>)<\/span>\r\ncountry<\/span> =<\/span> np<\/span>.<\/span>random<\/span>.<\/span>choice<\/span>(<\/span>\r\n\t[<\/span>'<\/span>United Kingdom<\/span>'<\/span>,<\/span> '<\/span>Poland<\/span>'<\/span>,<\/span> '<\/span>USA<\/span>'<\/span>,<\/span> '<\/span>Germany<\/span>'<\/span>,<\/span> None<\/span>],<\/span> \r\n\tlength<\/span>\r\n)<\/span>\r\ndf<\/span> =<\/span> pd<\/span>.<\/span>DataFrame<\/span>({<\/span>'<\/span>name<\/span>'<\/span>:<\/span> names<\/span>,<\/span> '<\/span>amount<\/span>'<\/span>:<\/span> amounts<\/span>,<\/span> '<\/span>country<\/span>'<\/span>:<\/span> country<\/span>})<\/span>\r\n\r\ntransactions<\/span> =<\/span> spark<\/span>.<\/span>createDataFrame<\/span>(<\/span>df<\/span>)<\/span>\r\nprint<\/span>(<\/span>'<\/span>Number of partitions: {}<\/span>'<\/span>.<\/span>format<\/span>(<\/span>transactions<\/span>.<\/span>rdd<\/span>.<\/span>getNumPartitions<\/span>()))<\/span>\r\nprint<\/span>(<\/span>'<\/span>Partitioner: {}<\/span>'<\/span>.<\/span>format<\/span>(<\/span>transactions<\/span>.<\/span>rdd<\/span>.<\/span>partitioner<\/span>))<\/span>\r\nprint<\/span>(<\/span>'<\/span>Partitions structure: {}<\/span>'<\/span>.<\/span>format<\/span>(<\/span>transactions<\/span>.<\/span>rdd<\/span>.<\/span>glom<\/span>().<\/span>collect<\/span>()))<\/span>\r\n<\/code><\/pre>\n
\u5f53\u67e5\u770b\u5206\u533a\u7ed3\u6784\u65f6\uff0c\u53ef\u4ee5\u770b\u5230\u6211\u4eec\u7684\u6570\u636e\u88ab\u5206\u6210\u4e864\u4e2a\u5206\u533a\uff08\u56e0\u4e3a\u6211\u7684\u7b14\u8bb0\u672c\u67094\u4e2a\u6838\u5fc3\uff0c\u5e76\u4e14Spark\u4ee5\u72ec\u7acb\u6a21\u5f0f\u521b\u5efa\u4e864\u4e2a\u6267\u884c\u5668\uff09\u3002\u5f53\u6211\u4eec\u5bf9\u8be5\u6570\u636e\u5e27\u5e94\u7528\u8f6c\u6362\u5904\u7406\u65f6\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u5206\u533a\u7684\u5904\u7406\u5c06\u5728\u5355\u72ec\u7684\u7ebf\u7a0b\u4e2d\u8fdb\u884c\uff08\u5728\u6211\u7684\u60c5\u51b5\u4e0b\uff0c\u8fd9\u5c06\u662f\u6bcf\u4e2a\u5904\u7406\u5668\u6838\u5fc3\uff09\u3002<\/p>\n
\u7136\u800c\uff0c\u4e3a\u4ec0\u4e48\u8981\u8003\u8651\u8fd9\u4ef6\u4e8b\u5462\uff1f<\/p>\n
\u6700\u91cd\u8981\u7684\u539f\u56e0\u662f\u6027\u80fd\u3002\u901a\u8fc7\u62e5\u6709\u5728\u5355\u4e00\u8282\u70b9\u4e0a\u8fdb\u884c\u8ba1\u7b97\u6240\u9700\u7684\u6240\u6709\u6570\u636e\uff0c\u53ef\u4ee5\u51cf\u5c11\u6d17\u724c\uff08\u9700\u8981\u5e8f\u5217\u5316\u548c\u7f51\u7edc\u6d41\u91cf\uff09\u7684\u5f00\u9500\u3002<\/p>\n
\u7b2c\u4e8c\u4e2a\u539f\u56e0\u662f\u6210\u672c\u524a\u51cf\u3002\u901a\u8fc7\u63d0\u9ad8\u96c6\u7fa4\u5229\u7528\u7387\uff0c\u6709\u52a9\u4e8e\u51cf\u5c11\u95f2\u7f6e\u8d44\u6e90\u3002<\/p>\n
\u4e3a\u4e86\u6709\u6548\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\uff0c\u9700\u8981\u5efa\u7acb\u4e00\u4e2a\u7ba1\u7406\u5206\u533a\u7684\u673a\u5236\u3002<\/p>\n
\u91cd\u65b0\u5212\u5206\u5206\u533a<\/h2>\n
\u7ba1\u7406\u5206\u533a\u7684\u7b2c\u4e00\u79cd\u65b9\u6cd5\u662f\u91cd\u65b0\u5206\u533a\u64cd\u4f5c\u3002<\/p>\n
\u518d\u5206\u533a\u662f\u4e00\u4e2a\u64cd\u4f5c\uff0c\u7528\u4e8e\u589e\u52a0\u6216\u51cf\u5c11\u5728\u96c6\u7fa4\u4e2d\u88ab\u5206\u5272\u7684\u6570\u636e\u7684\u5206\u533a\u6570\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u5305\u62ec\u5168\u5c40\u6d17\u724c\u3002\u7ed3\u679c\u662f\uff0c\u518d\u5206\u533a\u662f\u4e00\u4e2a\u9ad8\u6210\u672c\u7684\u8fc7\u7a0b\u3002\u5728\u5178\u578b\u573a\u666f\u4e2d\uff0c\u5927\u90e8\u5206\u6570\u636e\u5e94\u8be5\u88ab\u5e8f\u5217\u5316\u3001\u79fb\u52a8\u548c\u53cd\u5e8f\u5217\u5316\u3002<\/p>\n
\u4f8b\u5982\uff0c<\/p>\n
repartitioned<\/span> =<\/span> transactions<\/span>.<\/span>repartition<\/span>(<\/span>8<\/span>)<\/span>\r\nprint<\/span>(<\/span>'<\/span>Number of partitions: {}<\/span>'<\/span>.<\/span>format<\/span>(<\/span>repartitidoned<\/span>.<\/span>rdd<\/span>.<\/span>getNumPartitions<\/span>()))<\/span>\r\nprint<\/span>(<\/span>'<\/span>Partitions structure: {}<\/span>'<\/span>.<\/span>format<\/span>(<\/span>repartitioned<\/span>.<\/span>rdd<\/span>.<\/span>glom<\/span>().<\/span>collect<\/span>()))<\/span>\r\n<\/code><\/pre>\n
\u53ef\u4ee5\u770b\u5230\u5206\u533a\u6570\u91cf\u589e\u52a0\u5230\u4e868\u4e2a\uff0c\u5e76\u4e14\u6570\u636e\u5df2\u6839\u636e\u6bcf\u4e2a\u5206\u533a\u91cd\u65b0\u8c03\u6574\u7684\u3002<\/p>\n
\u9664\u4e86\u53ef\u4ee5\u6307\u5b9a\u76f4\u63a5\u5206\u533a\u7684\u6570\u91cf\uff0c\u8fd8\u53ef\u4ee5\u6307\u5b9a\u8981\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u533a\u7684\u5217\u540d\u3002<\/p>\n
\u6bd4\u5982\u8bf4\uff0c<\/p>\n
repartitioned<\/span> =<\/span> transactions<\/span>.<\/span>repartition<\/span>(<\/span>'<\/span>country<\/span>'<\/span>)<\/span>\r\nprint<\/span>(<\/span>'<\/span>Number of partitions: {}<\/span>'<\/span>.<\/span>format<\/span>(<\/span>repartitidoned<\/span>.<\/span>rdd<\/span>.<\/span>getNumPartitions<\/span>()))<\/span>\r\nprint<\/span>(<\/span>'<\/span>Partitions structure: {}<\/span>'<\/span>.<\/span>format<\/span>(<\/span>repartitioned<\/span>.<\/span>rdd<\/span>.<\/span>glom<\/span>().<\/span>collect<\/span>()))<\/span>\r\n<\/code><\/pre>\n
\u6709200\u4e2a\u5206\u533a\uff0c\u5176\u4e2d\u8bb8\u591a\u5206\u533a\u90fd\u5b8c\u5168\u4e3a\u7a7a\u3002\u672c\u4e66\u5c06\u8ba8\u8bba\u8fd9\u4e00\u70b9\u3002<\/p>\n
\u53ea\u6709\u5728\u660e\u786e\u7406\u89e3\u5982\u4f55\u52a0\u901f\u4f7f\u7528\u60a8\u7684Spark\u4f5c\u4e1a\uff0c\u5e76\u4e14\u8fd9\u4e2a\u64cd\u4f5c\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u5e76\u4e0d\u90a3\u4e48\u6709\u7528\u65f6\uff0c\u624d\u6709\u610f\u4e49\u5229\u7528\u8fd9\u79cd\u65b9\u6cd5\u3002<\/p>\n
\u878d\u5408<\/h2>\n
\u7ba1\u7406\u5206\u533a\u7684\u7b2c\u4e8c\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528 coalesce\u3002<\/p>\n
\u8fd9\u4e2a\u64cd\u4f5c\u53ef\u4ee5\u51cf\u5c11\u5206\u533a\u7684\u6570\u91cf\uff0c\u907f\u514d\u8fdb\u884c\u5b8c\u5168\u6d17\u724c\u3002\u6267\u884c\u8005\u53ef\u4ee5\u5b89\u5168\u5730\u5c06\u6570\u636e\u79fb\u52a8\u5230\u6700\u5c11\u6570\u91cf\u7684\u5206\u533a\uff0c\u53ea\u4ece\u5197\u4f59\u8282\u70b9\u79fb\u52a8\u6570\u636e\u3002\u56e0\u6b64\uff0c\u5728\u9700\u8981\u51cf\u5c11\u5206\u533a\u6570\u91cf\u7684\u60c5\u51b5\u4e0b\uff0c\u5e94\u8be5\u4f7f\u7528coalesce\u800c\u4e0d\u662frepartition\u3002<\/p>\n
\u7136\u800c\uff0c\u6211\u4eec\u5e94\u8be5\u7406\u89e3\u53ef\u4ee5\u5927\u5927\u51cf\u5c11\u6570\u636e\u5904\u7406\u7684\u5e76\u884c\u6027\u3002\u5728\u8bb8\u591a\u60c5\u51b5\u4e0b\uff0ccoalesce\u4f1a\u5728\u8f6c\u6362\u94fe\u4e2d\u8fdb\u4e00\u6b65\u63a8\u52a8\uff0c\u5e76\u53ef\u80fd\u53d8\u6210\u6bd4\u9884\u671f\u5c11\u7684\u8282\u70b9\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u60a8\u53ef\u4ee5\u6307\u5b9ashuffle = true\u3002\u8fd9\u4f1a\u6dfb\u52a0\u4e00\u6b65\u6d17\u724c\uff0c\u4f46\u5982\u679c\u53ef\u80fd\uff0c\u91cd\u65b0\u6d17\u724c\u7684\u5206\u533a\u5c06\u4f7f\u7528\u6240\u6709\u7684\u96c6\u7fa4\u8d44\u6e90\u3002<\/p>\n
coalesced<\/span> =<\/span> transactions<\/span>.<\/span>coalesce<\/span>(<\/span>2<\/span>)<\/span>\r\nprint<\/span>(<\/span>'<\/span>Number of partitions: {}<\/span>'<\/span>.<\/span>format<\/span>(<\/span>coalesced<\/span>.<\/span>rdd<\/span>.<\/span>getNumPartitions<\/span>()))<\/span>\r\nprint<\/span>(<\/span>'<\/span>Partitions structure: {}<\/span>'<\/span>.<\/span>format<\/span>(<\/span>coalesced<\/span>.<\/span>rdd<\/span>.<\/span>glom<\/span>().<\/span>collect<\/span>()))<\/span>\r\n<\/code><\/pre>\n
\u5728\u6211\u4eec\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u904d\u5386\u5269\u4f59\u7684\u5206\u533a\uff0c\u786e\u8ba4\u54ea\u4e9b\u6570\u636e\u88ab\u79fb\u52a8\uff0c\u54ea\u4e9b\u6570\u636e\u4ecd\u7136\u7559\u5728\u539f\u4f4d\u7f6e\u4e0a\u3002<\/p>\n
\u5206\u533a\u7684\u5c42\u6b21<\/h1>\n
\u6211\u60f3\u5f37\u8abfSpark\u5206\u5340\u7684\u4e0d\u540c\u6578\u64da\u8655\u7406\u5c64\u7d1a\u7684\u4e3b\u984c\u3002\u9019\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u53ea\u60f3\u8a0e\u8ad6\u9019\u4e9b\u5c64\u7d1a\u4e2d\u7684\u4e00\u500b\uff0c\u4f46\u4e0b\u4e00\u7bc7\u6587\u7ae0\u5c07\u8ddf\u9032\u5177\u9ad4\u7684\u63d0\u793a\u3002<\/p>\n
\u5728\u7269\u7406\u5c42\u9762\u4e0a\uff0c\u5b58\u5728\u7740\u4e09\u4e2a\u5173\u952e\u9636\u6bb5, \u5373\u8f93\u5165\u3001\u6d17\u724c\u548c\u8f93\u51fa\uff0c\u8fd9\u4e9b\u9636\u6bb5\u4e2d\u5206\u533a\u7684\u6570\u91cf\u662f\u5f88\u91cd\u8981\u7684\u3002<\/p>\n
\u8fd9\u4e9b\u90fd\u53ef\u4ee5\u7528\u4e0d\u540c\u7684\u65b9\u6cd5\u6765\u8c03\u6574\u548c\u7ba1\u7406\u3002\u4f8b\u5982\uff0c\u5728\u8f93\u5165\u548c\u8f93\u51fa\u65b9\u9762\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u63a7\u5236\u5206\u533a\u7684\u5927\u5c0f\u6765\u63a7\u5236 \u8f93\u51fa\u65b9\u9762\uff0c\u60a8\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6267\u884ccoalesce\u6216repartition\u6765\u63a7\u5236\u6587\u4ef6\u6570\u91cf\u548c\u4efb\u52a1\u6570\u91cf\u3002\u5728\u6d17\u724c\u65b9\u9762\uff0c\u60a8\u53ef\u4ee5\u63a7\u5236\u79fb\u52a8\u6570\u636e\u7684\u7f51\u7edc\u6570\u636e\u91cf\u3002<\/p>\n
\u5728\u8f93\u5165\u9636\u6bb5\u7684\u5206\u533a<\/h2>\n
\u8ba9\u6211\u4eec\u4ece\u6839\u636e\u8f93\u5165\u6570\u636e\u96c6\u7684\u5927\u5c0f\u6765\u786e\u5b9a\u5206\u533a\u6570\u91cf\u5f00\u59cb\u5427\u3002<\/p>\n
\u5982\u679c\u53ef\u4ee5\u5c06\u6570\u636e\u5206\u5272\uff0cSpark\u53ef\u4ee5\u975e\u5e38\u6709\u6548\u5730\u5904\u7406\u8f93\u5165\u6570\u636e\u3002\u5728HDFS\u6216Cassandra\u7b49\u6570\u636e\u5b58\u50a8\u4e2d\uff0c\u6570\u636e\u7684\u5e03\u5c40\u65b9\u5f0f\u4ee5\u53caSpark\u5728\u8bfb\u53d6\u65f6\u5982\u4f55\u5206\u5272\u6570\u636e\u5177\u6709\u660e\u663e\u7684\u76f8\u4f3c\u4e4b\u5904\u3002<\/p>\n
\u60f3\u8c61\u4e00\u4e0b\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u7531\u672a\u538b\u7f29\u7684\u6587\u672c\u6587\u4ef6\u7ec4\u6210\u7684\u8f93\u5165\u6570\u636e\uff0c\u5b58\u50a8\u5728\u5206\u5e03\u5f0f\u6587\u4ef6\u7cfb\u7edfHDFS\u4e2d\u7684\u5341\u4e2a\u8282\u70b9\u4e0a\uff0c\u5927\u7ea6\u4e3a30GB\uff08\u7ea630000MB\uff09\u3002<\/p>\n
Spark\u5c06\u4eceHDFS\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u5e76\u4e3a\u5355\u4e2a\u8f93\u5165\u5206\u533a\u521b\u5efa\u4e00\u4e2a\u5206\u533a\u3002\u8f93\u5165\u5206\u533a\u662f\u901a\u8fc7Hadoop\u7684InputFormat\u6765\u8bbe\u7f6e\u7528\u4e8e\u8bfb\u53d6\u6587\u4ef6\u7684\u3002\u5b58\u5728\u4e00\u4e2a30GB\u672a\u538b\u7f29\u6587\u672c\u6587\u4ef6\u5b58\u50a8\u5728HDFS\u4e2d\uff0c\u6839\u636e\u9ed8\u8ba4\u7684HDFS\u5757\u5927\u5c0f\u8bbe\u7f6e\uff08128MB\uff09\u548c\u9ed8\u8ba4\u7684spark.files.maxPartitionBytes\uff08128MB\uff09\uff0c\u8be5\u6587\u4ef6\u5c06\u88ab\u5b58\u50a8\u4e3a240\u4e2a\u5757\u3002\u56e0\u6b64\uff0c\u4ece\u8be5\u6587\u4ef6\u8bfb\u53d6\u7684\u6570\u636e\u6846\u5c06\u6709240\u4e2a\u5206\u533a\u3002<\/p>\n
\u8fd9\u4e0eSpark\u7684\u9ed8\u8ba4\u5e76\u884c\u5ea6(spark.default.parallelism)\u7684\u503c\u76f8\u5339\u914d\u3002<\/p>\n
\u5982\u679c\u65e0\u6cd5\u5206\u5272\u60a8\u7684\u6570\u636e\uff0c\u5219Spark\u5c06\u4f7f\u7528\u9ed8\u8ba4\u7684\u5206\u533a\u6570\u3002\u5728\u4f5c\u4e1a\u542f\u52a8\u65f6\uff0c\u5206\u533a\u7684\u6570\u91cf\u5c06\u7b49\u4e8e\u6240\u6709\u6267\u884c\u8282\u70b9\u7684\u603b\u6838\u5fc3\u6570\u3002<\/p>\n
\u6d17\u724c\u5206\u5272<\/h2>\n
\"spark-partitions-3.jpeg\"<\/div>\n
\u5728Spark\u7ba1\u9053\u4e2d\uff0c\u6700\u4ee4\u4eba\u75db\u82e6\u7684\u5730\u65b9\u662f\u9700\u8981\u5176\u4ed6\u5206\u533a\u7684\u4fe1\u606f\u5e76\u89e6\u53d1shuffle\u7684\u5bbd\u8f6c\u6362\u5904\u7406\u3002\u4e0d\u5e78\u7684\u662f\uff0c\u867d\u7136\u53ef\u4ee5\u6d88\u9664\u8fd9\u79cd\u8f6c\u6362\u5904\u7406\uff0c\u4f46\u53ef\u4ee5\u51cf\u8f7b\u5bf9\u6027\u80fd\u7684shuffle\u5f71\u54cd\u3002<\/p>\n
Shuffle partition\u662f\u5728\u5e7f\u6cdb\u7684\u8f6c\u6362\u5904\u7406\u4e2d\u7528\u4e8e\u6570\u636e\u6d17\u724c\u7684\u4e00\u79cd\u5206\u533a\u65b9\u5f0f\u3002\u7136\u800c\uff0c\u5728\u5e7f\u6cdb\u7684\u8f6c\u6362\u5904\u7406\u4e2d\uff0cshuffle partition\u7684\u6570\u91cf\u88ab\u8bbe\u7f6e\u4e3a200\u3002\u65e0\u8bba\u60a8\u7684\u6570\u636e\u662f\u5927\u8fd8\u662f\u5c0f\uff0c\u60a8\u7684\u96c6\u7fa4\u914d\u7f6e\u662f20\u4e2aexecutor\u4e0e\u5426\uff0c\u5e76\u4e0d\u662f\u95ee\u9898\uff0c\u4ecd\u7136\u662f200\u3002\u662f\u7684\uff0c\u662f\u7684\uff0c\u8fd9\u662f\u5728repartition\u90e8\u5206\u770b\u5230\u7684\uff0c\u5e76\u4e14\u8fd9\u662f\u4e00\u4e2a\u795e\u79d8\u7684\u6570\u5b57\u3002<\/p>\n
\u56e0\u6b64\uff0c\u5728Shuffle\u4e2d\u63a7\u5236\u5e76\u884c\u6027\u7684\u53c2\u6570\u662fspark.sql.shuffle.partitions\u3002\u9ed8\u8ba4\u503c\u662f200\u7684\u539f\u56e0\u662f\uff0c\u901a\u8fc7\u73b0\u5b9e\u4e16\u754c\u7684\u7ecf\u9a8c\u53d1\u73b0\uff0c\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u597d\u7684\u9ed8\u8ba4\u503c\u3002\u7136\u800c\uff0c\u5b9e\u9645\u4e0a\uff0c\u8fd9\u4e2a\u503c\u5e76\u4e0d\u603b\u662f\u597d\u7684\u3002<\/p>\n
\"spark-partitions-4.jpeg\"<\/div>\n
\u5f53\u4e00\u4e2a\u975e\u5e38\u5c0f\u7684\u5206\u533a\u4e2d\u5b58\u5728\u5927\u91cf\u6570\u636e\u65f6\uff0c\u6267\u884c\u5668\u5904\u7406\u7684\u4efb\u52a1\u6570\u91cf\u4f1a\u51cf\u5c11\uff0c\u6bcf\u4e2a\u6267\u884c\u5668\u7684\u8d1f\u8377\u4f1a\u589e\u52a0\uff0c\u4ece\u800c\u53ef\u80fd\u5bfc\u81f4\u5185\u5b58\u9519\u8bef\u3002\u53e6\u5916\uff0c\u5982\u679c\u5c06\u5206\u533a\u5927\u5c0f\u8bbe\u7f6e\u4e3a\u8d85\u8fc7\u6267\u884c\u5668\u53ef\u7528\u5185\u5b58\u7684\u5927\u5c0f\uff0c\u4f1a\u5bfc\u81f4\u6ea2\u51fa\uff08spill\uff09\u5230\u78c1\u76d8\u3002\u6ea2\u51fa\u901a\u5e38\u662f\u6700\u6162\u7684\u64cd\u4f5c\u4e4b\u4e00\u3002\u57fa\u672c\u4e0a\uff0c\u5728\u6267\u884c\u78c1\u76d8\u6ea2\u51fa\u671f\u95f4\uff0c\u5982\u679cSpark\u64cd\u4f5c\u65e0\u6cd5\u653e\u5165\u5185\u5b58\uff0c\u5219\u4f1a\u5c06\u90e8\u5206\u6570\u636e\u5199\u5165\u78c1\u76d8\uff0c\u4ee5\u4f7fSpark\u4f5c\u4e1a\u80fd\u591f\u5904\u7406\u4efb\u610f\u5927\u5c0f\u7684\u6570\u636e\u3002\u867d\u7136\u8fd9\u4e0d\u4f1a\u7834\u574f\u60a8\u7684\u6d41\u6c34\u7ebf\uff0c\u4f46\u7531\u4e8e\u78c1\u76d8I\/O\u548c\u5783\u573e\u56de\u6536\u7684\u989d\u5916\u5f00\u9500\uff0c\u6548\u7387\u5c06\u975e\u5e38\u4f4e\u4e0b\u3002<\/p>\n
\u56e0\u6b64\uff0cspark.sql.shuffle.partitions\u6210\u4e3a\u5728\u4f7f\u7528Spark\u65f6\u6700\u5e38\u8bbe\u7f6e\u7684\u53c2\u6570\u4e4b\u4e00\u3002<\/p>\n
\u529f\u7387\u5206\u914d<\/h2>\n
\u901a\u8fc7\u4ee5\u9002\u5f53\u9009\u62e9\u7684\u6761\u4ef6\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u533a\u5e76\u4fdd\u5b58\uff0c\u53ef\u4ee5\u6781\u5927\u5730\u52a0\u5feb\u540e\u7eed\u5904\u7406\u6d41\u7a0b\u4e2d\u6240\u9700\u6570\u636e\u7684\u8bfb\u53d6\u548c\u83b7\u53d6\u901f\u5ea6\u3002<\/p>\n
\u6700\u521d\uff0c\u5728\u4e00\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u5728\u6570\u636e\u6e90\u7684\u5206\u533a\u641c\u7d22\u4e4b\u540e\u4f7f\u7528\u5206\u533a\u526a\u5207\u6765\u9650\u5236Spark\u5728\u67e5\u8be2\u65f6\u8bfb\u53d6\u7684\u6587\u4ef6\u548c\u5206\u533a\u7684\u6570\u91cf\u3002\u6709\u65f6\u5019\u751a\u81f3\u53ef\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5206\u533a\u641c\u7d22\uff08\u4f8b\u5982AWS S3\uff09\u3002\u5728Spark 3.0\u4e2d\uff0c\u52a8\u6001\u5206\u533a\u526a\u5207\u7684\u6982\u5ff5\u4e5f\u662f\u5f88\u91cd\u8981\u7684\u3002\u7136\u800c\uff0c\u6709\u65f6\u8fd9\u4e9b\u4f18\u5316\u63aa\u65bd\u53ef\u80fd\u4f1a\u5bfc\u81f4\u60c5\u51b5\u53d8\u5f97\u66f4\u7cdf\u3002\u4f8b\u5982\uff0c\u4e3a\u4e86\u83b7\u53d6\u7406\u89e3\u5206\u533a\u6240\u9700\u7684\u5143\u6570\u636e\uff0c\u53ef\u80fd\u9700\u8981\u5bf9\u6587\u4ef6\u7cfb\u7edf\u8fdb\u884c\u9012\u5f52\u626b\u63cf\uff0c\u8fd9\u53ef\u80fd\u4f1a\u82b1\u8d39\u5f88\u957f\u65f6\u95f4\uff08\u7279\u522b\u662f\u5f53\u5206\u533a\u6570\u91cf\u5f88\u591a\u65f6\uff09\u3002\u6b64\u5916\uff0c\u6240\u6709\u8868\u7684\u5143\u6570\u636e\u90fd\u5fc5\u987b\u5728\u9a71\u52a8\u7a0b\u5e8f\u8fdb\u7a0b\u7684\u5185\u5b58\u4e2d\u5b9e\u4f8b\u5316\uff0c\u8fd9\u5c06\u5bfc\u81f4\u5185\u5b58\u4f7f\u7528\u91cf\u975e\u5e38\u5927\u3002<\/p>\n
\u9996\u5148\uff0c\u4fdd\u5b58\u6570\u636e\u6846\u5230\u78c1\u76d8\u65f6\uff0c\u8bf7\u7279\u522b\u6ce8\u610f\u5206\u533a\u7684\u5927\u5c0f\u3002\u5728\u5199\u5165\u65f6\uff0cSpark\u4f1a\u4e3a\u6bcf\u4e2a\u4efb\u52a1\u751f\u6210\u4e00\u4e2a\u6587\u4ef6\uff08\u6bcf\u4e2a\u5206\u533a\u4e00\u4e2a\u6587\u4ef6\uff09\uff0c\u5728\u8bfb\u53d6\u65f6\uff0c\u5b83\u4f1a\u8bfb\u53d6\u81f3\u5c11\u4e00\u4e2a\u6587\u4ef6\u7684\u4efb\u52a1\u3002\u95ee\u9898\u662f\uff0c\u4fdd\u5b58\u7684\u6570\u636e\u6846\u5728\u914d\u7f6e\u4e86\u66f4\u591a\u5185\u5b58\u7684\u96c6\u7fa4\u4e2d\u53ef\u4ee5\u5904\u7406\u5927\u5206\u533a\u5927\u5c0f\u800c\u6ca1\u6709\u4efb\u4f55\u95ee\u9898\uff0c\u4f46\u5f53\u5c1d\u8bd5\u5728\u5c0f\u578b\u96c6\u7fa4\u4e2d\u52a0\u8f7d\u4fdd\u5b58\u7684\u6570\u636e\u6846\u65f6\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u95ee\u9898\u3002<\/p>\n
\u5047\u8bbe\u6709\u4e00\u4e2a\u7528\u4e8e\u5927\u89c4\u6a21\u524d\u5904\u7406\u7684\u96c6\u7fa4\uff0c\u5e76\u4e14\u8fd8\u6709\u4e00\u4e2a\u7528\u4e8e\u5c0f\u89c4\u6a21\u4e14\u66f4\u9ad8\u6548\u7684\u670d\u52a1\u7684\u96c6\u7fa4\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u89e3\u51b3\u65b9\u6848\u662f\u5728\u5199\u5165\u6570\u636e\u5e27\u4e4b\u524d\uff0c\u5c06\u5176\u91cd\u65b0\u5206\u533a\u5230\u66f4\u591a\u7684\u5206\u533a\uff0c\u4ee5\u786e\u4fdd\u540e\u7eed\u7684\u96c6\u7fa4\u4e0d\u4f1a\u8fc7\u8f7d\u3002<\/p>\n
\u603b\u7ed3<\/h1>\n
    \n
  • \n
      \u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u306e\u6570\u3092\u5897\u3084\u3059\u969b\u306b\u306f\u3001repartition()(\u30d5\u30eb\u30b7\u30e3\u30c3\u30d5\u30eb\u3092\u5b9f\u884c\u3057\u307e\u3059)\u3092\u4f7f\u3044\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u306e\u6570\u3092\u6e1b\u3089\u3059\u969b\u306b\u306f\u3001coalesce()(\u30b7\u30e3\u30c3\u30d5\u30eb\u3092\u6700\u5c0f\u5316\u3057\u307e\u3059)\u3092\u4f7f\u3044\u307e\u3059\u3002<\/ul>\n
        \u4eca\u5929\uff0c\u6211\u5011\u8ac7\u8ad6\u4e86\u7269\u7406\u5c64\u9762\u7684\u5206\u5340\u3002\u4e0b\u4e00\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u4ecb\u7d39\u66f4\u9ad8\u5c64\u6b21\u7684\u5206\u5340\u8abf\u6574\u65b9\u6cd5\u3002<\/p>\n
        \u63a8\u8350\u7684\u4e66\u7c4d<\/h2>\n
          \n
        • \n
            Spark: The Definitive Guide<\/ul>\n<\/li>\n<\/ul>\n
             <\/p>\n
              Learning Spark: Lightning-Fast Data Analytics<\/ul>\n","protected":false},"excerpt":{"rendered":"
              Spark\u5206\u533a – \u535a\u5ba2 | luminousmen\u7ffb\u8bd1\u3002 \u9019\u672c\u66f8\u662f\u6458\u8b6f\u7248\u672c\uff0c\u7121\u6cd5\u4fdd\u8b49\u5176\u6e96\u78ba\u6027\u3002\u8acb […]<\/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-50536","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nSpark\u7684\u5206\u533a - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/spark\u7684\u5206\u533a\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spark\u7684\u5206\u533a\" \/>\n<meta property=\"og:description\" content=\"Spark\u5206\u533a – \u535a\u5ba2 | luminousmen\u7ffb\u8bd1\u3002 \u9019\u672c\u66f8\u662f\u6458\u8b6f\u7248\u672c\uff0c\u7121\u6cd5\u4fdd\u8b49\u5176\u6e96\u78ba\u6027\u3002\u8acb […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/spark\u7684\u5206\u533a\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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