hadoop-mapreduce-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4354) Performance improvement with compressor object reinit restriction
Date Mon, 02 Jul 2012 19:49:36 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13405288#comment-13405288

Robert Joseph Evans commented on MAPREDUCE-4354:

I am not an expert on the compression so I don't feel confident giving it a +1 right now,
but the patch looks OK to me.  Do you have the results of running test-patch on this?  Do
you have plans to port this to trunk/branch-2?
> Performance improvement with compressor object reinit restriction
> -----------------------------------------------------------------
>                 Key: MAPREDUCE-4354
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4354
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: performance
>    Affects Versions:
>            Reporter: Ankit Kamboj
>            Priority: Minor
>              Labels: performance
>             Fix For:
>         Attachments: codec_reinit_diff, modify_lzo_codec_reinit
> HADOOP-5879 patch aimed at picking the conf (instead of default) settings for GzipCodec.
It also involved re-initializing the recycled compressor object. 
> On our performance tests, this re-initialization led to performance degradation of 15%
for LzoCodec because re-initialization for Lzo involves reallocation of buffers. LzoCodec
takes the initial settings from config so it is not necessary to re-initialize it. This patch
checks for the codec class and calls reinit only if the codec class is Gzip. This led to significant
performance improvement of 15% for LzoCodec.

This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira


View raw message