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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4702) remove namesystem lock from DatanodeManager#fetchDatanodes
Date Tue, 16 Apr 2013 03:06:18 GMT
Chris Nauroth created HDFS-4702:
-----------------------------------

             Summary: remove namesystem lock from DatanodeManager#fetchDatanodes
                 Key: HDFS-4702
                 URL: https://issues.apache.org/jira/browse/HDFS-4702
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 3.0.0
            Reporter: Chris Nauroth


{{DatanodeManager#fetchDatanodes}} currently holds the namesystem read lock while iterating
through data nodes.  This method is called from the namenode web UI.  HDFS-3990 reported a
performance problem in this code path.  This is a follow-up jira to investigate whether or
not we can remove the lock.

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