[jira] Commented: (WHIRR-146) Changing the mapred.child.java.opts value does not change the heap size from a default one.

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

    [ https://issues.apache.org/jira/browse/WHIRR-146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965574#action_12965574 ] 

Tom White commented on WHIRR-146:
---------------------------------

Looking at this more, the new properties aren't in Hadoop 0.20.2, so we should revert the part for apache/hadoop/post-configure. Tibor, do you agree?

> Changing the mapred.child.java.opts value does not change the heap size from a default one.
> -------------------------------------------------------------------------------------------
>
>                 Key: WHIRR-146
>                 URL: https://issues.apache.org/jira/browse/WHIRR-146
>             Project: Whirr
>          Issue Type: Bug
>         Environment: Amazon EC2, Amazon Linux images.
>            Reporter: Tibor Kiss
>            Assignee: Tibor Kiss
>             Fix For: 0.3.0
>
>         Attachments: WHIRR-146.patch, whirr-146.patch
>
>
> Even if I change the value for mapred.child.java.opts the task is started with -Xmx200m.
> Since the mapred.child.java.opts and mapred.child.ulimit has been deprecated, we need to set the mapred.map.child.java.opts, mapred.reduce.child.java.opts respectively the mapred.map.child.ulimit and mapred.reduce.child.ulimit in order to have any effect.
> Unfortunately the /scripts/cdh/install and /scripts/apache/install which generates the /etc/hadoop/conf.dist/hadoop-site.xml is not synchronized with this deprecation as a result we are not able to use mappers and reducers which does not fit in 200M heap size.
> How to reproduce: 
> 1. Start a cluster on large instances where we are using 64bit jvm and run a simple distcp, you will experience Child jvm crash.
> 2. Or run a job with mappers or reducers which does not fit in 200M heap, it will experience OutOfMemoryError in child processes.

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