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Junping Du commented on HADOOP-10048: ------------------------------------- I would prefer not to backport to 2.6 and 2.7 for the same reason as [~jlowe] mentioned. This is a performance gain but not a bug fix which should be kept out of maintenance release as our previous practices. > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org