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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10048) LocalDirAllocator should avoid holding locks while accessing the filesystem
Date Wed, 06 May 2015 03:39:36 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-10048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer updated HADOOP-10048:
--------------------------------------
    Labels: BB2015-05-TBR  (was: )

> LocalDirAllocator should avoid holding locks while accessing the filesystem
> ---------------------------------------------------------------------------
>
>                 Key: HADOOP-10048
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10048
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 2.3.0
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>              Labels: BB2015-05-TBR
>         Attachments: HADOOP-10048.patch
>
>
> As noted in MAPREDUCE-5584 and HADOOP-7016, LocalDirAllocator can be a bottleneck for
multithreaded setups like the ShuffleHandler.  We should consider moving to a lockless design
or minimizing the critical sections to a very small amount of time that does not involve I/O
operations.



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