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https://issues.apache.org/jira/browse/TEZ-3203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15261376#comment-15261376
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Bikas Saha commented on TEZ-3203:
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Now looking at the full code based on the findbugs I think I dont know what I
am talking about :). The last patch is not needed. Patch number 2 from Jason is
good to go.
> DAG hangs when one of the upstream vertices has zero tasks
> ----------------------------------------------------------
>
> Key: TEZ-3203
> URL: https://issues.apache.org/jira/browse/TEZ-3203
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Priority: Critical
> Attachments: TEZ-3203.001.patch, TEZ-3203.002.patch, TEZ-3203.3.patch
>
>
> A DAG hangs during execution if it has a vertex with multiple inputs and one
> of those upstream vertices has zero tasks and is using ShuffleVertexManager.
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