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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