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https://issues.apache.org/jira/browse/TEZ-3222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15717500#comment-15717500
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Ming Ma commented on TEZ-3222:
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+1. Thanks [~jeagles].
> 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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