{"id":207,"date":"2018-03-12T14:12:10","date_gmt":"2018-03-12T06:12:10","guid":{"rendered":"http:\/\/www.max-shu.com\/blog\/?p=207"},"modified":"2018-03-12T14:12:10","modified_gmt":"2018-03-12T06:12:10","slug":"hadoop%e6%80%a7%e8%83%bd%e6%a8%a1%e5%9e%8b%ef%bc%887%ef%bc%89","status":"publish","type":"post","link":"http:\/\/www.max-shu.com\/blog\/?p=207","title":{"rendered":"Hadoop\u6027\u80fd\u6a21\u578b\uff087\uff09"},"content":{"rendered":"<p><span style=\"font-size: large;\"><b>4 \u7f51\u7edc\u4f20\u8f93\u6027\u80fd\u6a21\u578b<\/b><\/span><\/p>\n<p>\u5728shuffle\u9636\u6bb5\uff0c\u6240\u6709map\u4efb\u52a1\u751f\u6210\u7684\u6570\u636e\u90fd\u8981\u62f7\u8d1d\u5230\u8fd0\u884creduce\u4efb\u52a1\u7684\u8282\u70b9\u4e0a\uff08\u9664\u4e86\u5728\u672c\u5730\uff09\uff0c\u6574\u4e2a\u5728\u7f51\u7edc\u4e2d\u4f20\u8f93\u7684\u6570\u636e\u662f\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-208\" src=\"http:\/\/www.max-shu.com\/blog\/wp-content\/uploads\/2018\/03\/\u4e0b\u8f7d-46.png\" alt=\"\" width=\"903\" height=\"70\" \/><br \/>\n\u8fd9\u91cc\u7684finalOutMapSize\u662f\u5355\u4e2amap\u4efb\u52a1\u751f\u6210\u7684\u6570\u636e\u5927\u5c0f\u3002<\/p>\n<p>\u6574\u4e2a\u7f51\u7edc\u6d88\u8017\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-209\" src=\"http:\/\/www.max-shu.com\/blog\/wp-content\/uploads\/2018\/03\/\u4e0b\u8f7d-47.png\" alt=\"\" width=\"899\" height=\"38\" \/><\/p>\n<p><span style=\"font-size: large;\"><b>5 Map\uff0dReduce Job\u7684\u6027\u80fd\u6a21\u578b<\/b><\/span><\/p>\n<p>MapReduce Job\u7531\u591a\u4e2amap\u3001reduce\u4efb\u52a1\u5e76\u884c\u6267\u884c\uff0c\u6709\u4e24\u79cd\u57fa\u672c\u65b9\u6cd5\u6765\u8bc4\u4f30job\u7684\u603b\u6d88\u8017\uff0c\uff08i\uff09\u7528\u4efb\u52a1\u8c03\u5ea6\u4eff\u771f\u5668\u4eff\u771f\u4efb\u52a1\u7684\u6267\u884c\uff0c\uff08ii\uff09\u8ba1\u7b97\u671f\u671b\u7684\u603b\u6d88\u8017\u3002<\/p>\n<p>\u4eff\u771f\u5305\u62ec\u5728\u865a\u62df\u65cf\u4e0a\u8c03\u5ea6\uff0c\u6a21\u4eff\u72ec\u7acb\u4efb\u52a1\u7684\u6267\u884c\u3002\u6bcf\u4e2a\u4efb\u52a1\u7684\u6d88\u8017\u53ef\u4ee5\u7528\u4e0a\u9762\u7684\u6027\u80fd\u6a21\u578b\u8ba1\u7b97\u3002<\/p>\n<p>\u7b2c\u4e8c\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e0b\u9762\u7684\u65b9\u6cd5\u8ba1\u7b97\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-210\" src=\"http:\/\/www.max-shu.com\/blog\/wp-content\/uploads\/2018\/03\/\u4e0b\u8f7d-48.png\" alt=\"\" width=\"901\" height=\"377\" \/><\/p>\n<p>\u6574\u4e2ajob\u6d88\u8017\u5c31\u662f\u6240\u6709map\u548creduce\u4efb\u52a1\u7684\u6d88\u8017\u603b\u548c\u3002<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-211\" src=\"http:\/\/www.max-shu.com\/blog\/wp-content\/uploads\/2018\/03\/\u4e0b\u8f7d-49.png\" alt=\"\" width=\"899\" height=\"79\" \/><\/p>\n<p>\u603b\u7684I\/O\uff0cCPU\uff0c\u7f51\u7edc\u7684\u6d88\u8017\uff1a<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-212\" src=\"http:\/\/www.max-shu.com\/blog\/wp-content\/uploads\/2018\/03\/\u4e0b\u8f7d-50.png\" alt=\"\" width=\"905\" height=\"55\" \/><\/p>\n<p><span style=\"color: #ff6600;\">\uff08\u5b8c\uff09<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>4 \u7f51\u7edc\u4f20\u8f93\u6027\u80fd\u6a21\u578b \u5728shuffle\u9636\u6bb5\uff0c\u6240\u6709map\u4efb\u52a1\u751f\u6210\u7684\u6570\u636e\u90fd\u8981\u62f7\u8d1d\u5230\u8fd0\u884creduce\u4efb\u52a1\u7684\u8282\u70b9\u4e0a\uff08\u9664 &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[63],"tags":[80,123,122,120,121],"class_list":["post-207","post","type-post","status-publish","format-standard","hentry","category-63","tag-hadoop","tag-hdfs","tag-mapreduce","tag-120","tag-121"],"views":1401,"_links":{"self":[{"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/207","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=207"}],"version-history":[{"count":1,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/207\/revisions"}],"predecessor-version":[{"id":213,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/207\/revisions\/213"}],"wp:attachment":[{"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=207"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=207"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.max-shu.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}