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https://issues.apache.org/jira/browse/PIG-4434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14380648#comment-14380648
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Daniel Dai commented on PIG-4434:
---------------------------------
RB link: https://reviews.apache.org/r/32492/
> 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
>
>
> 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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