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https://issues.apache.org/jira/browse/TWILL-217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15862599#comment-15862599
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Terence Yim commented on TWILL-217:
-----------------------------------
I think a better approach is to provide classloader isolation so that classes
used by Twill won't affect/be affected by libraries used by user application.
> AppMaster launcher should include eventHandler dependencies and nothing else
> from application
> ---------------------------------------------------------------------------------------------
>
> Key: TWILL-217
> URL: https://issues.apache.org/jira/browse/TWILL-217
> Project: Apache Twill
> Issue Type: Improvement
> Components: yarn
> Affects Versions: 0.9.0
> Reporter: Martin Serrano
>
> Currently the launcher for the appmaster includes the application.jar
> libraries. This is to support user code that adds an EventHandler. The
> application may have many dependencies and including them in the appmaster
> classpath can lead to otherwise inaddressable incompatibilities.
> In my case, something in my application's large dependency graph was
> interfering with the Kafka server operation. I was not able to determine
> what it was but tweaking the appmaster loader to not include my application
> jars fixed the issue.
> Instead the bundler that creates the twill.jar should include the
> EventHandler extension (if any) as an explicit dependency. In this way, only
> the jars needed to support the event handler will be on the twill classpath.
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