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https://issues.apache.org/jira/browse/TEZ-3203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15231460#comment-15231460
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Bikas Saha commented on TEZ-3203:
---------------------------------
Good catch!
Maybe we can get away with removing the numpendingtasks check here. I am
worried that doing it earlier may be susceptible to calling scheduleTasks()
multiple times.
{code}if (numBipartiteSourceTasksCompleted == totalNumBipartiteSourceTasks &&
numPendingTasks > 0) {
LOG.info("All source tasks assigned. " +
"Ramping up " + numPendingTasks +
" remaining tasks for vertex: " + getContext().getVertexName());
schedulePendingTasks(numPendingTasks, 1);
return;
}{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
>
>
> 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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