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Posted to issues@tez.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2015/04/06 08:06:12 UTC

[jira] [Updated] (TEZ-1993) Implement a pluggable InputSizeEstimator for grouping fairly

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

Gopal V updated TEZ-1993:
-------------------------
    Attachment:     (was: TEZ-1993.3.patch)

> 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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