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Date: Fri, 1 Feb 2008 12:49:07 -0800 (PST)
From: "Allen Wittenauer (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-2766) [HOD] No way to set HADOOP_OPTS
 environment variable to the Hadoop daemons through HOD
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    [ https://issues.apache.org/jira/browse/HADOOP-2766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12564929#action_12564929 ] 

Allen Wittenauer commented on HADOOP-2766:
------------------------------------------

See also https://issues.apache.org/jira/browse/HADOOP-2551

> [HOD] No way to set HADOOP_OPTS environment variable to the Hadoop daemons through HOD
> --------------------------------------------------------------------------------------
>
>                 Key: HADOOP-2766
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2766
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/hod
>    Affects Versions: 0.16.0
>            Reporter: Hemanth Yamijala
>            Assignee: Vinod Kumar Vavilapalli
>            Priority: Critical
>         Attachments: hadoop-2766
>
>
> For purposes of performance tuning it should be possible to set some environment variables that Hadoop honors before launching the Hadoop daemons. For e.g. to set the heap size of the JVM, we should set the HADOOP_HEAPSIZE variable. These can be configured through hodrc using the gridservice-mapred.envs environment variable. This works for everything *except* HADOOP_OPTS, which is also useful, for e.g. to pass in Garbage collection parameters to the JVM, like -XX:+UseParallelGC. This is because HOD tries to set HADOOP_OPTS from the gridservice-mapred.java-opts variable, but it does not read the java-opts variable anywhere properly.

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