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From "Fernando (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6167) bin/hadoop script doesn't allow for different memory settings for each daemon type
Date Thu, 23 Jul 2009 01:53:15 GMT
bin/hadoop script doesn't allow for different memory settings for each daemon type
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                 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


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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