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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10048) LocalDirAllocator should avoid holding locks while accessing the filesystem
Date Tue, 07 Jun 2016 16:35:21 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15318824#comment-15318824
] 

Hudson commented on HADOOP-10048:
---------------------------------

SUCCESS: Integrated in Hadoop-trunk-Commit #9921 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/9921/])
HADOOP-10048. LocalDirAllocator should avoid holding locks while (junping_du: rev c14c1b298e29e799f7c8f15ff24d7eba6e0cd39b)
* hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/LocalDirAllocator.java


> 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
>             Fix For: 2.8.0
>
>         Attachments: HADOOP-10048.003.patch, HADOOP-10048.004.patch, HADOOP-10048.005.patch,
HADOOP-10048.006.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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