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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2766) [HOD] No way to set HADOOP_OPTS environment variable to the Hadoop daemons through HOD
Date Tue, 05 Feb 2008 12:00:08 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565713#action_12565713
] 

Vinod Kumar Vavilapalli commented on HADOOP-2766:
-------------------------------------------------

Hudson gave a -1 because of failure of the test case org.apache.hadoop.dfs.TestBalancer.testBalancer0
which is in no way related to this patch or HOD. The patch can be passed.

> [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, 0.16.1, 0.17.0
>            Reporter: Hemanth Yamijala
>            Assignee: Vinod Kumar Vavilapalli
>            Priority: Critical
>             Fix For: 0.16.0, 0.16.1, 0.17.0
>
>         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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