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From "Gera Shegalov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4815) Speed up FileOutputCommitter#commitJob for many output files
Date Tue, 10 Mar 2015 18:09:43 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gera Shegalov updated MAPREDUCE-4815:
-------------------------------------
    Summary: Speed up FileOutputCommitter#commitJob for many output files  (was: FileOutputCommitter.commitJob
can be very slow for jobs with many output files)

> Speed up FileOutputCommitter#commitJob for many output files
> ------------------------------------------------------------
>
>                 Key: MAPREDUCE-4815
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4815
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv2
>    Affects Versions: 0.23.3, 2.0.1-alpha, 2.4.1
>            Reporter: Jason Lowe
>            Assignee: Siqi Li
>              Labels: perfomance
>         Attachments: MAPREDUCE-4815.v10.patch, MAPREDUCE-4815.v11.patch, MAPREDUCE-4815.v12.patch,
MAPREDUCE-4815.v13.patch, MAPREDUCE-4815.v14.patch, MAPREDUCE-4815.v15.patch, MAPREDUCE-4815.v16.patch,
MAPREDUCE-4815.v17.patch, MAPREDUCE-4815.v3.patch, MAPREDUCE-4815.v4.patch, MAPREDUCE-4815.v5.patch,
MAPREDUCE-4815.v6.patch, MAPREDUCE-4815.v7.patch, MAPREDUCE-4815.v8.patch, MAPREDUCE-4815.v9.patch
>
>
> If a job generates many files to commit then the commitJob method call at the end of
the job can take minutes.  This is a performance regression from 1.x, as 1.x had the tasks
commit directly to the final output directory as they were completing and commitJob had very
little to do.  The commit work was processed in parallel and overlapped the processing of
outstanding tasks.  In 0.23/2.x, the commit is single-threaded and waits until all tasks have
completed before commencing.



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