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https://issues.apache.org/jira/browse/TEZ-3758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16047011#comment-16047011
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Siddharth Seth commented on TEZ-3758:
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cc [~aplusplus], [~harishjp]
> Vertex can hang in RUNNING state when two task attempts finish very closely
> and have retroactive failures
> ---------------------------------------------------------------------------------------------------------
>
> Key: TEZ-3758
> URL: https://issues.apache.org/jira/browse/TEZ-3758
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.7.1, 0.9.0
> Reporter: Kuhu Shukla
> Assignee: Kuhu Shukla
> Attachments: TEZ-3758.001.patch
>
>
> A vertex's count of what tasks are done can go off in a case where two task
> attempts finish very closely, say within a millisecond of each other. We had
> a case where this task, which was marked successful, never scheduled another
> attempt upon getting a retroactive failure since it thought it had one
> uncompleted task attempt already. This is because the attempt that finished 1
> ms later transitioned to SUCCEEDED but we don't take any action on the
> taskAttempStatus data structure and it stays false. This JIRA will attempt to
> solve that race.
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