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https://issues.apache.org/jira/browse/TEZ-2082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14317288#comment-14317288
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Siddharth Seth commented on TEZ-2082:
-------------------------------------
Oops. Sorry about that. Already have this fixed in follow up changes intended
for TEZ-2003. Didn't realize it existed in the main branch as well.
The race is expected, and can't really be controlled. It existed with the old
code as well - but the null bit was handled better there.
The patch looks good. Not sure if we need the pre-condition though. The trace
should help debug this scenario.
> Failing test: TestPreemption::testPreemptionWithSession/
> --------------------------------------------------------
>
> Key: TEZ-2082
> URL: https://issues.apache.org/jira/browse/TEZ-2082
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: Hitesh Shah
> Assignee: Bikas Saha
> Attachments: TEZ-2082.1.patch
>
>
> From
> https://builds.apache.org/job/Tez-Build/891/testReport/junit/org.apache.tez.dag.app/TestPreemption/testPreemptionWithSession/
> Exception in thread "Thread-27" java.lang.NullPointerException
> at
> org.apache.tez.dag.app.TaskAttemptListenerImpTezDag.getTask(TaskAttemptListenerImpTezDag.java:222)
> at
> org.apache.tez.dag.app.MockDAGAppMaster$MockContainerLauncher.run(MockDAGAppMaster.java:230)
> at java.lang.Thread.run(Thread.java:662)
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