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https://issues.apache.org/jira/browse/HADOOP-9211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13553898#comment-13553898
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Sarah Weissman commented on HADOOP-9211:
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I do not know enough about hadoop to feel confident in making a recommendation
on what the default max heap size should be. Also, I was running the examples
in non-distributed mode. 256m does appear to be enough so that the pi and
wordcount examples from
share/hadoop/mapreduce/hadoop-mapreduce-examples-2.0.2-alpha.jar do not run out
of memory in non-distributed mode.
> HADOOP_CLIENT_OPTS default setting fixes max heap size at 128m, disregards
> HADOOP_HEAPSIZE
> ------------------------------------------------------------------------------------------
>
> Key: HADOOP-9211
> URL: https://issues.apache.org/jira/browse/HADOOP-9211
> Project: Hadoop Common
> Issue Type: Bug
> Components: conf
> Affects Versions: 2.0.2-alpha
> Reporter: Sarah Weissman
> Original Estimate: 1m
> Remaining Estimate: 1m
>
> hadoop-env.sh as included in the 2.0.2alpha release tarball contains:
> export HADOOP_CLIENT_OPTS="-Xmx128m $HADOOP_CLIENT_OPTS"
> This overrides any heap settings in HADOOP_HEAPSIZE.
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