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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10048) LocalDirAllocator should avoid holding locks while accessing the filesystem
Date Fri, 20 May 2016 17:38:13 GMT

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

Jason Lowe updated HADOOP-10048:
    Attachment: HADOOP-10048.004.patch

Updating the patch to use AtomicReference so it's a little more clear that Context must not
be accessed directly multiple times during a method but rather via a cached local reference.
 I also tried to make checkstyle happier.

> 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
>         Attachments: HADOOP-10048.003.patch, HADOOP-10048.004.patch, 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

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