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Posted to dev@pig.apache.org by "Rohini Palaniswamy (JIRA)" <ji...@apache.org> on 2015/04/13 16:49:13 UTC

[jira] [Commented] (PIG-4434) Improve auto-parallelism for tez

    [ https://issues.apache.org/jira/browse/PIG-4434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14492471#comment-14492471 ] 

Rohini Palaniswamy commented on PIG-4434:
-----------------------------------------

+1

> Improve auto-parallelism for tez
> --------------------------------
>
>                 Key: PIG-4434
>                 URL: https://issues.apache.org/jira/browse/PIG-4434
>             Project: Pig
>          Issue Type: Improvement
>          Components: tez
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>             Fix For: 0.15.0
>
>         Attachments: PIG-4434-1.patch, PIG-4434-2.patch, PIG-4434-3.patch, PIG-4434-4.patch, PIG-4434-5.patch
>
>
> Tez auto-parallelism currently has some limitation:
> 1. ShuffledVertexManager only decrease parallelism not increase
> 2. Pig currently exaggerate parallelism at frontend, ShuffledVertexManager might get initial parallelism way large than actual, that would be costly
> Instead of that, we can gradually adjust initial vertex parallelism at runtime once upstream vertexes finishes.



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