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Posted to common-issues@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2013/10/15 18:08:42 UTC

[jira] [Created] (HADOOP-10048) LocalDirAllocator should avoid holding locks while accessing the filesystem

Jason Lowe created HADOOP-10048:
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             Summary: 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


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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