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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4577) Enable aux services to have their own custom classpath/jar file
Date Mon, 11 Jan 2016 19:37:39 GMT

    [ https://issues.apache.org/jira/browse/YARN-4577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15092543#comment-15092543
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Sangjin Lee commented on YARN-4577:
-----------------------------------

We do have a fairly generic isolated classloader under hadoop-common (ApplicationClassLoader):
https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ApplicationClassLoader.java

It's currently used by mapreduce (job classloader and the client-side job launcher classloader).

It seems that we should try to reuse the ApplicationClassLoader for this use case instead
of creating another variant. Thoughts?

> Enable aux services to have their own custom classpath/jar file
> ---------------------------------------------------------------
>
>                 Key: YARN-4577
>                 URL: https://issues.apache.org/jira/browse/YARN-4577
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 2.8.0
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>         Attachments: YARN-4577.1.patch
>
>
> Right now, users have to add their jars to the NM classpath directly, thus put them on
the system classloader. But if multiple versions of the plugin are present on the classpath,
there is no control over which version actually gets loaded. Or if there are any conflicts
between the dependencies introduced by the auxiliary service and the NM itself, they can break
the NM, the auxiliary service, or both.
> The solution could be: to instantiate aux services using a classloader that is different
from the system classloader.



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