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https://issues.apache.org/jira/browse/TEZ-1059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14300015#comment-14300015
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Bikas Saha commented on TEZ-1059:
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This may not be necessary anymore. With the vertex state update mechanism
interested vertex managers can subscribe to the parallelism updates and respond
appropriately.
> Generalize change in connected vertices when the parallelism of a vertex
> changes
> --------------------------------------------------------------------------------
>
> Key: TEZ-1059
> URL: https://issues.apache.org/jira/browse/TEZ-1059
> Project: Apache Tez
> Issue Type: Sub-task
> Reporter: Bikas Saha
> Assignee: Bikas Saha
>
> When a vertex changes its parallelism, consumer vertices may need to respond
> to it. 1-1 consumer vertices would need to change their parallelism to match.
> Scatter-gather consumers dont need to change.
> Currently, the tez dag code has special cased this for 1-1 edge which is fine
> for now but does not work with custom edges.
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