[jira] Commented: (HADOOP-6167) bin/hadoop script doesn't allow for different memory settings for each daemon type

["Fernando (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-6167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12734691#action_12734691 ] 

Fernando commented on HADOOP-6167:
----------------------------------

HBase scripts have the same issue since they were just copying things from Hadoop.. so they have the same bug.

Here is the related bug in HBase: https://issues.apache.org/jira/browse/HBASE-1687


> 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
>
>
> 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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