[jira] [Commented] (TEZ-3274) Vertex with MRInput and shuffle input does not respect slow start

["Zhiyuan Yang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TEZ-3274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15963717#comment-15963717 ] 

Zhiyuan Yang commented on TEZ-3274:
-----------------------------------

[~ebadger] Although I don't know what algorithm requires this dag shape, I assume there exists one since you guys tried to make it work. It would help if the job details can be shown. I don't think it's right to make existing ShuffleVertexManager work with this scenario because data exchange pattern from MRInput is apparently not shuffle. I'm +1 for using custom vertex manager (and possibly reuse ShuffleVertexManager code).

> Vertex with MRInput and shuffle input does not respect slow start
> -----------------------------------------------------------------
>
>                 Key: TEZ-3274
>                 URL: https://issues.apache.org/jira/browse/TEZ-3274
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Jonathan Eagles
>            Assignee: Eric Badger
>         Attachments: TEZ-3274.001.patch, TEZ-3274.002.patch
>
>
> Vertices with shuffle input and MRInput choose RootInputVertexManager (and not ShuffleVertexManager) and start containers and tasks immediately. In this scenario, resources can be wasted since they do not respect tez.shuffle-vertex-manager.min-src-fraction tez.shuffle-vertex-manager.max-src-fraction. 



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