Jonathan Eagles updated TEZ-3222:
    Attachment: TEZ-3222.8.patch

[~mingma], I've improved the CompositeRoutedDataMovementEvent as you have 
suggested and have checked for a null composite CompositeEventRouteMetadata not 
regress on this check. Please have a look at the version 8 of the patch to see 
that all concerns are addressed.

> Reduce messaging overhead for auto-reduce parallelism case
> ----------------------------------------------------------
>                 Key: TEZ-3222
>                 URL: https://issues.apache.org/jira/browse/TEZ-3222
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Jonathan Eagles
>            Assignee: Jonathan Eagles
>         Attachments: TEZ-3222.1.patch, TEZ-3222.2.patch, TEZ-3222.3.patch, 
> TEZ-3222.4.patch, TEZ-3222.5.patch, TEZ-3222.6.patch, TEZ-3222.7.patch, 
> TEZ-3222.8.patch
> A dag with 15k x 1000k vertex may auto-reduce to 15k x 1. And while the data  
> size is appropriate for 1 task attempt, this results in an increase in task 
> attempt message processing of 1000x.
> This jira aims to reduce the message processing in the auto-reduced task 
> while keeping the amount of message processing in the AM the same or less.

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