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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5453) Support fine grain locking in FSNamesystem
Date Mon, 04 Nov 2013 15:55:18 GMT
Daryn Sharp created HDFS-5453:
---------------------------------

             Summary: Support fine grain locking in FSNamesystem
                 Key: HDFS-5453
                 URL: https://issues.apache.org/jira/browse/HDFS-5453
             Project: Hadoop HDFS
          Issue Type: New Feature
          Components: namenode
    Affects Versions: 2.0.0-alpha, 3.0.0
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp


The namesystem currently uses a course grain lock to control access.  This prevents concurrent
writers in different branches of the tree, and prevents readers from accessing branches that
writers aren't using.

Features that introduce latency to namesystem operations, such as cold storage of inodes,
will need fine grain locking to avoid degrading the entire namesystem's throughput.



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