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http://issues.apache.org/jira/browse/HADOOP-514?page=comments#action_12433453 ] 
            
Doug Cutting commented on HADOOP-514:
-------------------------------------

I agree that the heartbeat should be configurable.  Setting it automatically 
would be nice.  But we must not be careful to let the heartbeat interval get 
too long, as other actions are dependent on it.  Currently block replications 
and deletions ride on heartbeat responses.  So the heartbeat interval 
determines the speed of re-replication and deletion.

> namenode heartbeat interval should be configurable
> --------------------------------------------------
>
>                 Key: HADOOP-514
>                 URL: http://issues.apache.org/jira/browse/HADOOP-514
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Wendy Chien
>
> The namenode heartbeat interval is currently a constant in FSConstants.   It 
> should be configurable instead.  Things which currently rely on the heartbeat 
> occuring fairly frequently should be disassociated.    

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