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From "Siddharth Seth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-702) minicluster classpath construction requires user to set yarn.is.minicluster in the job conf
Date Mon, 20 May 2013 21:17:17 GMT

    [ https://issues.apache.org/jira/browse/YARN-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13662367#comment-13662367
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Siddharth Seth commented on YARN-702:
-------------------------------------

I though HBase had already changed their tests to make use of the configuration returned by
the MiniCluster. In the two cases that you saw, were the applications explicitly picking up
the RM address - or was it restricted to the 'isMiniCluster' config variable ?
In terms of being similar to a normal cluster - the cluster configuration which is used by
clients is based on the cluster setup (RM address, jars, etc). Similarly, when the MiniCluster
comes up - it makes it's configuration (which is dynamic) available  via the getConfiguration
method.
I'd agree with the bit about having this documented properly. What could also be done, is
make cluster specific configuration (similar to the contents of yarn-site.xml) available via
the MiniCluster.
                
> minicluster classpath construction requires user to set yarn.is.minicluster in the job
conf
> -------------------------------------------------------------------------------------------
>
>                 Key: YARN-702
>                 URL: https://issues.apache.org/jira/browse/YARN-702
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager
>    Affects Versions: 2.0.4-alpha
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>
> YARN-129 improved classpath construction for miniclusters by, when yarn.is.minicluster
is set, adding the current JVM's classpath to the ContainerLaunchContext for the MR AM and
tasks.  An issue with this is that it requires the user to set yarn.is.minicluster on the
mapreduce side in the job conf, if they are not copying to RM conf into the jobconf.
> I think it would be better to bypass the ContainerLaunchContext and instead have the
nodemanager check the property, and if it is true, do the classpath additions there.

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