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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (TEZ-1993) Implement a pluggable InputSizeEstimator for grouping fairly
Date Sun, 08 Feb 2015 22:04:34 GMT

     [ https://issues.apache.org/jira/browse/TEZ-1993?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Gopal V updated TEZ-1993:
    Attachment: TEZ-1993.2.patch

Rebasing to trunk.

Without native MixIn support in the language, there is no better way to implement this.

> Implement a pluggable InputSizeEstimator for grouping fairly
> ------------------------------------------------------------
>                 Key: TEZ-1993
>                 URL: https://issues.apache.org/jira/browse/TEZ-1993
>             Project: Apache Tez
>          Issue Type: Bug
>    Affects Versions: 0.7.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>         Attachments: TEZ-1993.1.patch, TEZ-1993.2.patch
> Split grouping is currently done using a file size measurement which is the exact size
of the split as it stays at rest on HDFS.
> This is not valid for columnar formats and especially suffers from highly compressible
data skews.

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