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Hadoop QA commented on MAPREDUCE-4815: -------------------------------------- {color:red}-1 overall{color}. Here are the results of testing the latest attachment http://issues.apache.org/jira/secure/attachment/12696015/MAPREDUCE-4815.v11.patch against trunk revision 8acc5e9. {color:green}+1 @author{color}. The patch does not contain any @author tags. {color:green}+1 tests included{color}. The patch appears to include 2 new or modified test files. {color:green}+1 javac{color}. The applied patch does not increase the total number of javac compiler warnings. {color:green}+1 javadoc{color}. There were no new javadoc warning messages. {color:green}+1 eclipse:eclipse{color}. The patch built with eclipse:eclipse. {color:red}-1 findbugs{color}. The patch appears to introduce 13 new Findbugs (version 2.0.3) warnings. {color:green}+1 release audit{color}. The applied patch does not increase the total number of release audit warnings. {color:green}+1 core tests{color}. The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core. Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5142//testReport/ Findbugs warnings: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5142//artifact/patchprocess/newPatchFindbugsWarningshadoop-mapreduce-client-core.html Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5142//console This message is automatically generated. > FileOutputCommitter.commitJob can be very slow for jobs with many output files > ------------------------------------------------------------------------------ > > Key: MAPREDUCE-4815 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-4815 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: mrv2 > Affects Versions: 0.23.3, 2.0.1-alpha, 2.4.1 > Reporter: Jason Lowe > Assignee: Siqi Li > Attachments: MAPREDUCE-4815.v10.patch, MAPREDUCE-4815.v11.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)