You are viewing a plain text version of this content. The canonical link for it is here.

Posted to hdfs-dev@hadoop.apache.org by "dhruba borthakur (JIRA)" <ji...@apache.org> on 2010/04/12 07:39:47 UTC

[jira] Created: (HDFS-1093) Improve namenode scalability by splitting the FSNamesystem synchronized section in a read/write lock

Improve namenode scalability by splitting the FSNamesystem synchronized section in a read/write lock
----------------------------------------------------------------------------------------------------

                 Key: HDFS-1093
                 URL: https://issues.apache.org/jira/browse/HDFS-1093
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: dhruba borthakur
            Assignee: dhruba borthakur


Most critical data structures in the NameNode (NN) are protected by a syncronized methods in the FSNamesystem class. This essentially makes critical code paths in the NN single-threaded. However, a large percentage of the NN calls are listStatus, getBlockLocations, etc which do not change internal data structures at all, these are read-only calls. If we change the FSNamesystem lock to a read/write lock, many of the above operations can occur in parallel, thus improving the scalability of the NN.

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: https://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira