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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PIG-4434) Improve auto-parallelism for tez
Date Tue, 24 Mar 2015 19:34:53 GMT

     [ https://issues.apache.org/jira/browse/PIG-4434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai updated PIG-4434:
----------------------------
    Attachment: PIG-4434-2.patch

Several updates to the original patch. This patch also depends on some Tez fixes. I will link
the Tez Jira later once being created.

> 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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