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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7396) Revisit synchronization in Namenode
Date Thu, 13 Nov 2014 22:18:34 GMT
Tsz Wo Nicholas Sze created HDFS-7396:
-----------------------------------------

             Summary: Revisit synchronization in Namenode
                 Key: HDFS-7396
                 URL: https://issues.apache.org/jira/browse/HDFS-7396
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: namenode
            Reporter: Tsz Wo Nicholas Sze
            Assignee: Tsz Wo Nicholas Sze


HDFS-2106 separated block management to a new package from namenode.  As part of it, some
code was refactored to new classes such as DatanodeManager, HeartbeatManager, etc.  There
are opportunities for improve locking in namenode while currently the synchronization in namenode
is mainly done by a single global FSNamesystem lock. 



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