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https://issues.apache.org/jira/browse/TEZ-3203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15261125#comment-15261125
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Bikas Saha commented on TEZ-3203:
---------------------------------
My bad. I should have been more clear.
The following would be safer than removing the pendingTasks check altogether to
handled the (potentially impossible) case that pending tasks is still not
initialized from a -1 value. I can make the change and post the final patch.
{code}
if (numBipartiteSourceTasksCompleted == totalNumBipartiteSourceTasks &&
numPendingTasks >= 0) {
{code}
> 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
>
>
> 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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