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https://issues.apache.org/jira/browse/MAPREDUCE-5785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14222004#comment-14222004
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Hudson commented on MAPREDUCE-5785:
-----------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk #1965 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1965/])
MAPREDUCE-5785. Derive heap size or mapreduce.*.memory.mb automatically. (Gera
Shegalov and Karthik Kambatla via kasha) (kasha: rev
a4df9eed059977374c8e889cb85d79e8e514ad30)
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/MapReduceChildJVM.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/mapred/Task.java
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/JobConf.java
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskAttemptImpl.java
* hadoop-mapreduce-project/CHANGES.txt
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MRJobConfig.java
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TestMapReduceChildJVM.java
> Derive heap size or mapreduce.*.memory.mb automatically
> -------------------------------------------------------
>
> Key: MAPREDUCE-5785
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5785
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Components: mr-am, task
> Reporter: Gera Shegalov
> Assignee: Gera Shegalov
> Fix For: 3.0.0
>
> Attachments: MAPREDUCE-5785.v01.patch, MAPREDUCE-5785.v02.patch,
> MAPREDUCE-5785.v03.patch, mr-5785-4.patch, mr-5785-5.patch, mr-5785-6.patch
>
>
> Currently users have to set 2 memory-related configs per Job / per task type.
> One first chooses some container size map reduce.\*.memory.mb and then a
> corresponding maximum Java heap size Xmx < map reduce.\*.memory.mb. This
> makes sure that the JVM's C-heap (native memory + Java heap) does not exceed
> this mapreduce.*.memory.mb. If one forgets to tune Xmx, MR-AM might be
> - allocating big containers whereas the JVM will only use the default
> -Xmx200m.
> - allocating small containers that will OOM because Xmx is too high.
> With this JIRA, we propose to set Xmx automatically based on an empirical
> ratio that can be adjusted. Xmx is not changed automatically if provided by
> the user.
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