{"id":891,"date":"2011-12-02T21:00:15","date_gmt":"2011-12-02T13:00:15","guid":{"rendered":"http:\/\/www.yewen.us\/blog\/?p=891"},"modified":"2011-12-02T21:00:15","modified_gmt":"2011-12-02T13:00:15","slug":"puzzle-in-hadoop-streaming","status":"publish","type":"post","link":"https:\/\/www.yewen.us\/blog\/2011\/12\/puzzle-in-hadoop-streaming\/","title":{"rendered":"Hadoop Streaming \u7684\u5947\u602a\u95ee\u9898"},"content":{"rendered":"<p>\u4e4b\u524d\u4e00\u76f4\u5728\u767e\u5ea6\u7528\u5185\u90e8\u6539\u8fc7\u7684 hadoop \u7248\u672c, streaming \u63a5\u53e3\u4e0b, \u4e00\u76f4\u5c06 map command \u5199\u6210 &#8220;sh mapper.sh | sort | sh combiner.sh&#8221; \u6765\u505a\u4eba\u8089 combiner, \u76f8\u5b89\u65e0\u4e8b. \u5230\u4eba\u4eba\u540e, \u53d1\u73b0\u8fd9\u4e2a\u505a\u6cd5\u6709\u95ee\u9898, \u4eca\u5929\u6d4b\u8bd5\u4e86\u4e0b, \u679c\u7136\u5f88\u5947\u602a, \u6c42 hadoop \u5927\u62ff\u89e3\u7b54.<\/p>\n<p>\u5f53\u524d\u5b9e\u9a8c\u7684\u7248\u672c\u662f hadoop \u793e\u533a 0.21.0<\/p>\n<p><strong>\u5b9e\u9a8c 1. \u8ddf\u7ecf\u9a8c\u4e0d\u7b26\u7684\u60c5\u51b5<\/strong><\/p>\n<p>mapper.sh<\/p>\n<pre class=\"brush: bash; title: ; notranslate\" title=\"\">awk '{print $$}'<\/pre>\n<p>reducer.sh<\/p>\n<pre class=\"brush: bash; title: ; notranslate\" title=\"\">wc -l<\/pre>\n<p>map command<\/p>\n<pre class=\"brush: bash; title: ; notranslate\" title=\"\">sh mapper.sh | sort | sh reducer.sh<\/pre>\n<p>\u8fd9\u65f6\u5019, \u5355\u4e2a map \u5e76\u4e0d\u53ea\u8f93\u51fa\u4e00\u884c\u4fe1\u606f, \u800c\u662f\u4e00\u884c\u8f93\u5165\u4f1a\u5bfc\u81f4\u4e00\u884c\u8f93\u51fa<\/p>\n<p><strong>\u5b9e\u9a8c 2. \u7b26\u5408\u9884\u671f, \u4f46\u5f88\u522b\u626d\u7684\u5199\u6cd5<\/strong><\/p>\n<p>\u4fee\u6539 mapper.sh \u5982\u4e0b<\/p>\n<pre class=\"brush: bash; title: ; notranslate\" title=\"\">awk '{print $$}' | sort | wc -l<\/pre>\n<p>\u4fee\u6539 map command \u5982\u4e0b<\/p>\n<pre class=\"brush: bash; title: ; notranslate\" title=\"\">sh mapper.sh<\/pre>\n<p>\u8fd9\u65f6\u5019, \u5355\u4e2a map task \u8f93\u51fa\u5c31\u53ea\u6709\u4e00\u884c\u4e86<\/p>\n<p><strong>\u5b9e\u9a8c 3. \u4e0d\u5f97\u5df2\u518d\u5c01\u4e00\u5c42\u7684\u65b9\u6cd5<\/strong><\/p>\n<p>\u57fa\u4e8e\u5b9e\u9a8c 1 \u65b0\u589e\u4e00\u4e2a\u811a\u672c xp.sh \u5982\u4e0b<\/p>\n<pre class=\"brush: bash; title: ; notranslate\" title=\"\">sh mapper.sh | sort | sh reducer.sh<\/pre>\n<p>\u5e76\u4fee\u6539 map command \u5982\u4e0b<\/p>\n<pre class=\"brush: bash; title: ; notranslate\" title=\"\">sh xp.sh<\/pre>\n<p>\u8fd9\u65f6\u5019\u7684\u6548\u679c\u548c\u5b9e\u9a8c 2 \u7ed3\u679c\u4e00\u81f4<\/p>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>\u81f3\u5c11\u5728 Hadoop Streaming 0.21.0 \u8fd9\u4e2a\u7248\u672c\u91cc, \u5176\u6267\u884c\u65b9\u5f0f\u5e76\u4e0d\u662f <code>cat input_data | map_command<\/code> \u8fd9\u6837, \u5176\u4e2d map_command \u5fc5\u987b\u662f\u4e00\u4e2a\u5355\u6307\u4ee4\u65f6\u624d\u7b26\u5408\u8fd9\u4e2a\u5047\u8bbe<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e4b\u524d\u4e00\u76f4\u5728\u767e\u5ea6\u7528\u5185\u90e8\u6539\u8fc7\u7684 hadoop \u7248\u672c, streaming \u63a5\u53e3\u4e0b, \u4e00\u76f4\u5c06 map command [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[7],"tags":[76,144],"class_list":["post-891","post","type-post","status-publish","format-standard","hentry","category-tech-notes","tag-hadoop","tag-streaming"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p4aR5e-en","_links":{"self":[{"href":"https:\/\/www.yewen.us\/blog\/wp-json\/wp\/v2\/posts\/891","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yewen.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yewen.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yewen.us\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yewen.us\/blog\/wp-json\/wp\/v2\/comments?post=891"}],"version-history":[{"count":0,"href":"https:\/\/www.yewen.us\/blog\/wp-json\/wp\/v2\/posts\/891\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.yewen.us\/blog\/wp-json\/wp\/v2\/media?parent=891"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yewen.us\/blog\/wp-json\/wp\/v2\/categories?post=891"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yewen.us\/blog\/wp-json\/wp\/v2\/tags?post=891"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}