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https://issues.apache.org/jira/browse/TEZ-1547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14191629#comment-14191629
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Siddharth Seth commented on TEZ-1547:
-------------------------------------

Also, please take a look at the temporary patch posted on TEZ-1522. That should 
solve the problems of delays caused by waiting for a task to complete, as well 
as out of order scheduling - at least to some extent. I'd be more comfortable 
getting something like that in to 0.5.2 (and this one into 0.6), since it's 
easy to pull out via configuration, doesn't touch VertexImpl and scheduling / 
reconfiguration behavior, and doesn't introduce an incompatible change (which 
in most likelihood no-one will be affected by). That said, this patch has gone 
through reviews and testing.

> 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: Siddharth Seth
>         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
>
>
> Instead of the various APIs like onVertexStarted, simple notifications could 
> be sent.
> Some existing APIs could end up being deprecated.



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