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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4075) Reduce recommissioning overhead
Date Thu, 18 Oct 2012 19:32:08 GMT
Kihwal Lee created HDFS-4075:
--------------------------------

             Summary: Reduce recommissioning overhead
                 Key: HDFS-4075
                 URL: https://issues.apache.org/jira/browse/HDFS-4075
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 2.0.2-alpha, 0.23.4
            Reporter: Kihwal Lee
            Assignee: Kihwal Lee
            Priority: Critical


When datanodes are recommissioned, {BlockManager#processOverReplicatedBlocksOnReCommission()}
is called for each rejoined node and excess blocks are added to the invalidate list. The problem
is this is done while the namesystem write lock is held.


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