[jira] [Commented] (TEZ-2473) Consider using RawLocalFileSystem in MapOutput.createDiskMapOutput

["Siddharth Seth (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TEZ-2473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14573709#comment-14573709 ] 

Siddharth Seth commented on TEZ-2473:
-------------------------------------

[~rajesh.balamohan] - we'll need to do this for DIskFetchedInput as well. 
Should this changed be linked to increasing the frequency at which ifile writes checksums ? I believe that's a 4 byte sum irresopective of the data size ? The output on the 'map' side is already using RawFs - so is relying on the ifile checksum. I think it should be ok to change this as well, independent of the Ifile checksum, but that would be good to fix sooner rather than later.


> Consider using RawLocalFileSystem in MapOutput.createDiskMapOutput
> ------------------------------------------------------------------
>
>                 Key: TEZ-2473
>                 URL: https://issues.apache.org/jira/browse/TEZ-2473
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Rajesh Balamohan
>            Assignee: Rajesh Balamohan
>         Attachments: TEZ-2473.1.patch
>
>
> Currently it makes use of LocalFileSystem which would go through checksumming. This can save some CPU cycles in tasks involving disk merges.



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