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https://issues.apache.org/jira/browse/TEZ-1547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14193809#comment-14193809
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Rohini Palaniswamy commented on TEZ-1547:
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Pig uses ShuffleVertexManager of Tez for cases like group by, join, etc and a
custom one for order by. In case of ShuffleVertexManager, the estimated
parallelism is set as the vertex parallelism via setParallelism. But it is
always set to -1 in case of the order by vertex manager.
+[~daijy].
> Make use of state change notifier in VertexManagerPlugins
> ---------------------------------------------------------
>
> Key: TEZ-1547
> URL: https://issues.apache.org/jira/browse/TEZ-1547
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Siddharth Seth
> Assignee: Bikas Saha
> Attachments: TEZ-1547.1.patch, TEZ-1547.3.patch, TEZ-1547.4.patch,
> TEZ-1547.5.patch, TEZ-1547.6.patch, TEZ-1547.7.patch, TEZ-1547.8.patch,
> TEZ-1547.9.patch
>
>
> Instead of the various APIs like onVertexStarted, simple notifications could
> be sent.
> Some existing APIs could end up being deprecated.
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