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Hudson commented on MAPREDUCE-4815: ----------------------------------- FAILURE: Integrated in Hadoop-Yarn-trunk-Java8 #129 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/129/]) MAPREDUCE-4815. Speed up FileOutputCommitter#commitJob for many output files. (Siqi Li via gera) (gera: rev aa92b764a7ddb888d097121c4d610089a0053d11) * hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapreduce/lib/output/TestFileOutputCommitter.java * hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapred/TestFileOutputCommitter.java * hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml * hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/output/FileOutputCommitter.java * hadoop-mapreduce-project/CHANGES.txt > Speed up FileOutputCommitter#commitJob for many output files > ------------------------------------------------------------ > > Key: MAPREDUCE-4815 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-4815 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Components: mrv2 > Affects Versions: 0.23.3, 2.0.1-alpha, 2.4.1 > Reporter: Jason Lowe > Assignee: Siqi Li > Labels: perfomance > Fix For: 2.7.0 > > Attachments: MAPREDUCE-4815.v10.patch, MAPREDUCE-4815.v11.patch, > MAPREDUCE-4815.v12.patch, MAPREDUCE-4815.v13.patch, MAPREDUCE-4815.v14.patch, > MAPREDUCE-4815.v15.patch, MAPREDUCE-4815.v16.patch, MAPREDUCE-4815.v17.patch, > MAPREDUCE-4815.v3.patch, MAPREDUCE-4815.v4.patch, MAPREDUCE-4815.v5.patch, > MAPREDUCE-4815.v6.patch, MAPREDUCE-4815.v7.patch, MAPREDUCE-4815.v8.patch, > MAPREDUCE-4815.v9.patch > > > If a job generates many files to commit then the commitJob method call at the > end of the job can take minutes. This is a performance regression from 1.x, > as 1.x had the tasks commit directly to the final output directory as they > were completing and commitJob had very little to do. The commit work was > processed in parallel and overlapped the processing of outstanding tasks. In > 0.23/2.x, the commit is single-threaded and waits until all tasks have > completed before commencing. -- This message was sent by Atlassian JIRA (v6.3.4#6332)