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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-947) isReplicationInProgress() is very heavyweight
Date Mon, 29 Jan 2007 19:14:49 GMT
isReplicationInProgress() is very heavyweight
---------------------------------------------

                 Key: HADOOP-947
                 URL: https://issues.apache.org/jira/browse/HADOOP-947
             Project: Hadoop
          Issue Type: Bug
          Components: dfs
            Reporter: dhruba borthakur


Suppose a decommission is in progress. The namenode receives a heartbeat from the being-decommissioned
node and then invokes isReplicationInProgress() to determine if the decommissioned is complete.
This method is very heavyweight and chews up plenty of CPU.

One option to fix this issue is to keep a counter to indicate how many blocks are pending
replication.  This could also help in showing a progress-status-indicator to display how far
the decommissioning process is complete.


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