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https://issues.apache.org/jira/browse/MAPREDUCE-5932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14233217#comment-14233217
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Hudson commented on MAPREDUCE-5932:
-----------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #6642 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/6642/])
MAPREDUCE-5932. Provide an option to use a dedicated reduce-side shuffle log.
Contributed by Gera Shegalov (jlowe: rev
03ab24aa01ffea1cacf1fa9cbbf73c3f2904d981)
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/FileOutputFormat.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/resources/container-log4j.properties
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hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
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hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MRJobConfig.java
* hadoop-mapreduce-project/CHANGES.txt
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hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/ContainerRollingLogAppender.java
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hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/MapReduceChildJVM.java
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hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/main/java/org/apache/hadoop/mapreduce/v2/util/MRApps.java
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hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/main/java/org/apache/hadoop/mapred/YARNRunner.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/TestContainerLogAppender.java
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hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/ContainerLogAppender.java
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hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/TaskLog.java
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hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TestMapReduceChildJVM.java
> Provide an option to use a dedicated reduce-side shuffle log
> ------------------------------------------------------------
>
> Key: MAPREDUCE-5932
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5932
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv2
> Affects Versions: 2.4.0
> Reporter: Gera Shegalov
> Assignee: Gera Shegalov
> Fix For: 2.7.0
>
> Attachments: MAPREDUCE-5932.v01.patch, MAPREDUCE-5932.v02.patch,
> MAPREDUCE-5932.v03.patch, MAPREDUCE-5932.v04.patch, MAPREDUCE-5932.v05.patch,
> MAPREDUCE-5932.v06.patch
>
>
> For reducers in large jobs our users cannot easily spot portions of the log
> associated with problems with their code. An example reducer with INFO-level
> logging generates ~3500 lines / ~700KiB lines per second. 95% of the log is
> the client-side of the shuffle {{org.apache.hadoop.mapreduce.task.reduce.*}}
> {code}
> $ wc syslog
> 3642 48192 691013 syslog
> $ grep task.reduce syslog | wc
> 3424 46534 659038
> $ grep task.reduce.ShuffleScheduler syslog | wc
> 1521 17745 251458
> $ grep task.reduce.Fetcher syslog | wc
> 1045 15340 223683
> $ grep task.reduce.InMemoryMapOutput syslog | wc
> 400 4800 72060
> $ grep task.reduce.MergeManagerImpl syslog | wc
> 432 8200 106555
> {code}
> Byte percentage breakdown:
> {code}
> Shuffle total: 95%
> ShuffleScheduler: 36%
> Fetcher: 32%
> InMemoryMapOutput: 10%
> MergeManagerImpl: 15%
> {code}
> While this is information is actually often useful for devops debugging
> shuffle performance issues, the job users are often lost.
> We propose to have a dedicated syslog.shuffle file.
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