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https://issues.apache.org/jira/browse/TEZ-3203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15231014#comment-15231014
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Jason Lowe commented on TEZ-3203:
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The hang occurs because the downstream vertex with multiple inputs never
schedules tasks despite the upstream vertices completing. I believe this is
occurring because the upstream vertex with zero tasks is failing to send out a
CONFIGURED event, and therefore the downstream vertex keeps waiting on that
event before scheduling. It looks like ShuffleVertexManager can end up not
calling doneReconfiguringVertex when it has zero tasks to schedule.
> 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
> Priority: Critical
>
> 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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