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https://issues.apache.org/jira/browse/TEZ-2193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14364434#comment-14364434
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Jeff Zhang commented on TEZ-2193:
---------------------------------
Committed to master, branch-0.5 & branch-0.6
> Check returned value from EdgeManagerPlugin before using it
> -----------------------------------------------------------
>
> Key: TEZ-2193
> URL: https://issues.apache.org/jira/browse/TEZ-2193
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Jeff Zhang
> Assignee: Jeff Zhang
> Fix For: 0.5.4
>
> Attachments: TEZ-2193-1.patch, TEZ-2193-2.patch, TEZ-2193-3.patch,
> TEZ-2193-4.patch, TEZ-2193-5.patch
>
>
> e.g. dag has vertices v1, v2 and shuffle edge between them, and v2 has custom
> vertex manager and -1 parallelism. In this case v1's output spec may be has
> -1 physical edge which will cause task hangs in TezChild.
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