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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10759) Remove hardcoded JAVA_HEAP_MAX in hadoop-config.sh
Date Thu, 07 Aug 2014 04:27:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14088817#comment-14088817
] 

Eric Yang commented on HADOOP-10759:
------------------------------------

How is removing a hard coded mistake a feature?  This is a defect.  There is no need to run
with 1GB heap for trivial command line 90% of the time.  There is no contradiction in my statement,
it is quote out of context.  The 1GB max will automatically get applied, if no JAVA_HEAP_MAX
is defined.  However, it should not cap cli to 1GB in case if an administrator wants to run
cli operation that may require more memory, he can do:

export JAVA_HEAP_MAX=4096m

Then run the cli.  distcp and other utilities can directly benefit from this.

YARN hard code is not described in any part of this JIRA, I did not look at YARN cli that
may have the need to remove capped JAVA_HEAP_MAX.  If that is required, it can be filed as
another JIRA.

> Remove hardcoded JAVA_HEAP_MAX in hadoop-config.sh
> --------------------------------------------------
>
>                 Key: HADOOP-10759
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10759
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: bin
>    Affects Versions: 2.4.0
>         Environment: Linux64
>            Reporter: sam liu
>            Priority: Minor
>             Fix For: 2.6.0
>
>         Attachments: HADOOP-10759.patch, HADOOP-10759.patch
>
>
> In hadoop-common-project/hadoop-common/src/main/bin/hadoop-config.sh, there is a hard
code for Java parameter: 'JAVA_HEAP_MAX=-Xmx1000m'. It should be removed.



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