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Posted to issues@tez.apache.org by "Rajesh Balamohan (JIRA)" <ji...@apache.org> on 2015/01/15 13:18:35 UTC

[jira] [Updated] (TEZ-1937) Reduce cost of merging ifiles in UnorderedPartitionedWriter

     [ https://issues.apache.org/jira/browse/TEZ-1937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rajesh Balamohan updated TEZ-1937:
----------------------------------
    Attachment: TEZ-1937.WIP.patch

Attaching WIP patch. This should be faster than the current approach.  However, If we can move EOF_MARKER out of compressed block (in IFile.close() ), then we can just copy the compressed IFile content to another IFile.  

> Reduce cost of merging ifiles in UnorderedPartitionedWriter
> -----------------------------------------------------------
>
>                 Key: TEZ-1937
>                 URL: https://issues.apache.org/jira/browse/TEZ-1937
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Rajesh Balamohan
>         Attachments: TEZ-1937.WIP.patch
>
>
> Currently we iterate through all spilled files for merging.  This incurs additional deserialization cost.



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