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From "Yi Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10048) LocalDirAllocator should avoid holding locks while accessing the filesystem
Date Wed, 16 Mar 2016 09:36:33 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15197090#comment-15197090
] 

Yi Li commented on HADOOP-10048:
--------------------------------

It seems the failed test is not related with this patch. Any suggestions?

> 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-10048.003.patch, HADOOP-10048.patch, HADOOP-10048.trunk.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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