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https://issues.apache.org/jira/browse/HADOOP-6167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749565#action_12749565
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Allen Wittenauer commented on HADOOP-6167:
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I agree with Scott. This should be fixed.
> bin/hadoop script doesn't allow for different memory settings for each daemon
> type
> ----------------------------------------------------------------------------------
>
> Key: HADOOP-6167
> URL: https://issues.apache.org/jira/browse/HADOOP-6167
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.20.0
> Reporter: Fernando
> Attachments: hadoop, hadoop-script.diff
>
>
> bin/hadoop assumes that all daemon types ( namenode, datanode, jobtracker,
> tasktracker ), all use the same memory settings.. (HADOOP_HEAPSIZE).
> I propose changes to that script to allow overriding the default memory (
> HADOOP_HEAPSIZE ), with daemon specific OPTS (HADOOP_NAMENODE_OPTS, etc ).
> Basically at the bottom of the bin/hadoop script, it will check to see if the
> user has already set "-Xmx" in the HADOOP_OPTS variable.. if so, then it will
> ignore the JAVA_HEAP_SIZE variable..
> as such:
> # run it
> if [[ $HADOOP_OPTS == *-Xmx* ]]; then
> exec "$JAVA" $HADOOP_OPTS -classpath "$CLASSPATH" $CLASS "$@"
> else
> exec "$JAVA" $JAVA_HEAP_MAX $HADOOP_OPTS -classpath "$CLASSPATH" $CLASS "$@"
> fi
> I will attach the file as I have modified it..
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