{"id":10008375,"date":"2024-02-20T19:47:44","date_gmt":"2024-02-20T11:47:44","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008375"},"modified":"2024-02-20T19:47:44","modified_gmt":"2024-02-20T11:47:44","slug":"spark%e4%b8%ba%e4%bb%80%e4%b9%88%e6%af%94mapreduce%e5%bf%ab%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008375","title":{"rendered":"spark\u4e3a\u4ec0\u4e48\u6bd4mapreduce\u5feb\uff1f"},"content":{"rendered":"

spark\u4e3a\u4ec0\u4e48\u6bd4mapreduce\u5feb\uff1f<\/p>\n

\u9996\u5148\u6f84\u6e05\u51e0\u4e2a\u8bef\u533a\uff1a<\/h2>\n

1\uff1a\u4e24\u8005\u90fd\u662f\u57fa\u4e8e\u5185\u5b58\u8ba1\u7b97\u7684\uff0c\u4efb\u4f55\u8ba1\u7b97\u6846\u67b6\u90fd\u80af\u5b9a\u662f\u57fa\u4e8e\u5185\u5b58\u7684\uff0c\u6240\u4ee5\u7f51\u4e0a\u8bf4\u7684spark\u662f\u57fa\u4e8e\u5185\u5b58\u8ba1\u7b97\u6240\u4ee5\u5feb\uff0c\u663e\u7136\u662f\u9519\u8bef\u7684<\/p>\n

2;DAG\u8ba1\u7b97\u6a21\u578b\u51cf\u5c11\u7684\u662f\u78c1\u76d8I\/O\u6b21\u6570\uff08\u76f8\u6bd4\u4e8emapreduce\u8ba1\u7b97\u6a21\u578b\u800c\u8a00\uff09\uff0c\u800c\u4e0d\u662fshuffle\u6b21\u6570\uff0c\u56e0\u4e3ashuffle\u662f\u6839\u636e\u6570\u636e\u91cd\u7ec4\u7684\u6b21\u6570\u800c\u5b9a\uff0c\u6240\u4ee5shuffle\u6b21\u6570\u4e0d\u80fd\u51cf\u5c11<\/p>\n

\u6240\u4ee5\u603b\u7ed3spark\u6bd4mapreduce\u5feb\u7684\u539f\u56e0\u6709\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/h2>\n

1\uff1aDAG\u76f8\u6bd4hadoop\u7684mapreduce\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u53ef\u4ee5\u51cf\u5c11\u78c1\u76d8I\/O\u6b21\u6570<\/h3>\n

\u56e0\u4e3amapreduce\u8ba1\u7b97\u6a21\u578b\u53ea\u80fd\u5305\u542b\u4e00\u4e2amap\u548c\u4e00\u4e2areduce,\u6240\u4ee5reduce\u5b8c\u540e\u5fc5\u987b\u8fdb\u884c\u843d\u76d8\uff0c\u800cDAG\u53ef\u4ee5\u8fde\u7eedshuffle\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e00\u4e2aDAG\u53ef\u4ee5\u5b8c\u6210\u597d\u51e0\u4e2a<\/p>\n

mapreduce\uff0c\u6240\u4ee5dag\u53ea\u9700\u8981\u5728\u6700\u540e\u4e00\u4e2ashuffle\u843d\u76d8\uff0c\u5c31\u6bd4mapreduce\u5c11\u4e86\uff0c\u603bshuffle\u6b21\u6570\u8d8a\u591a\uff0c\u51cf\u5c11\u7684\u843d\u76d8\u6b21\u6570\u5c31\u8d8a\u591a<\/p>\n

2\uff1aspark shuffle \u7684\u4f18\u5316<\/h3>\n

mapreduce\u5728shuffle\u65f6\u9ed8\u8ba4\u8fdb\u884c\u6392\u5e8f\uff0cspark\u5728shuffle\u65f6\u5219\u53ea\u6709\u90e8\u5206\u573a\u666f\u624d\u9700\u8981\u6392\u5e8f\uff08bypass\u6280\u5e08\u4e0d\u9700\u8981\u6392\u5e8f\uff09\uff0c\u6392\u5e8f\u662f\u975e\u5e38\u8017\u65f6\u7684\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u52a0\u5febshuffle\u901f\u5ea6<\/p>\n

3\uff1aspark\u652f\u6301\u5c06\u9700\u8981\u53cd\u590d\u7528\u5230\u7684\u6570\u636e\u8fdb\u884c\u7f13\u5b58<\/h3>\n

\u6240\u4ee5\u5bf9\u4e8e\u4e0b\u6b21\u518d\u6b21\u4f7f\u7528\u6b64rdd\u65f6\uff0c\u4e0d\u518d\u518d\u6b21\u8ba1\u7b97\uff0c\u800c\u662f\u76f4\u63a5\u4ece\u7f13\u5b58\u4e2d\u83b7\u53d6\uff0c\u56e0\u6b64\u53ef\u4ee5\u51cf\u5c11\u6570\u636e\u52a0\u8f7d\u8017\u65f6\uff0c\u6240\u4ee5\u66f4\u9002\u5408\u9700\u8981\u8fed\u4ee3\u8ba1\u7b97\u7684\u673a\u5668\u5b66\u4e60\u7b97\u6cd5<\/p>\n

4\uff1a\u4efb\u52a1\u7ea7\u522b\u5e76\u884c\u5ea6\u4e0a\u7684\u4e0d\u540c<\/h3>\n

mapreduce\u91c7\u7528\u591a\u8fdb\u7a0b\u6a21\u578b\uff0c\u800cspark\u91c7\u7528\u4e86\u591a\u7ebf\u7a0b\u6a21\u578b\uff0c\u591a\u8fdb\u7a0b\u6a21\u578b\u7684\u597d\u5904\u662f\u4fbf\u4e8e\u7ec6\u7c92\u5ea6\u63a7\u5236\u6bcf\u4e2a\u4efb\u52a1\u5360\u7528\u7684\u8d44\u6e90\uff0c\u4f46\u6bcf\u6b21\u4efb\u52a1\u7684\u542f\u52a8\u90fd\u4f1a\u6d88\u8017\u4e00\u5b9a\u7684\u542f\u52a8\u65f6\u95f4\uff0c\u5373mapreduce\u7684map task \u548creduce task\u662f\u8fdb\u7a0b\u7ea7\u522b\u7684\uff0c\u90fd\u662fjvm\u8fdb\u7a0b\uff0c\u6bcf\u6b21\u542f\u52a8\u90fd\u9700\u8981\u91cd\u65b0\u7533\u8bf7\u8d44\u6e90\uff0c\u6d88\u8017\u4e0d\u5fc5\u8981\u7684\u65f6\u95f4\uff0c\u800cspark task\u662f\u57fa\u4e8e\u7ebf\u7a0b\u6a21\u578b\u7684\uff0c\u901a\u8fc7\u590d\u7528\u7ebf\u7a0b\u6c60\u4e2d\u7684\u7ebf\u7a0b\u6765\u51cf\u5c11\u542f\u52a8\uff0c\u5173\u95edtask\u6240\u9700\u8981\u7684\u5f00\u9500\uff08\u591a\u7ebf\u7a0b\u6a21\u578b\u4e5f\u6709\u7f3a\u70b9\uff0c\u7531\u4e8e\u540c\u8282\u70b9\u4e0a\u6240\u6709\u4efb\u52a1\u8fd0\u884c\u5728\u4e00\u4e2a\u8fdb\u884c\u4e2d\uff0c\u56e0\u6b64\uff0c\u4f1a\u51fa\u73b0\u4e25\u91cd\u7684\u8d44\u6e90\u4e89\u7528\uff0c\u96be\u4ee5\u7ec6\u7c92\u5ea6\u63a7\u5236\u6bcf\u4e2a\u4efb\u52a1\u5360\u7528\u8d44\u6e90\uff09<\/p>\n

\u4f5c\u8005\uff1a\u4eac\u4e1c\u96f6\u552e \u5434\u5316\u658c<\/p>\n

\u6765\u6e90\uff1a\u4eac\u4e1c\u4e91\u5f00\u53d1\u8005\u793e\u533a \u8f6c\u8f7d\u8bf7\u6ce8\u660e\u6765\u6e90<\/p>\n

https:\/\/segmentfault.com\/a\/1190000044642498<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

spark\u4e3a\u4ec0\u4e48\u6bd4mapreduce\u5feb\uff1f \u9996\u5148\u6f84\u6e05\u51e0\u4e2a\u8bef\u533a\uff1a 1\uff1a\u4e24\u8005\u90fd\u662f\u57fa\u4e8e\u5185\u5b58\u8ba1\u7b97\u7684\uff0c\u4efb\u4f55\u8ba1\u7b97\u6846\u67b6\u90fd\u80af\u5b9a\u662f […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10008375","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008375","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10008375"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008375\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008375"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008375"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008375"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}