[jira] Created: (HADOOP-2649) The ReplicationMonitor sleep period should be configurable

The ReplicationMonitor sleep period should be configurable
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                 Key: HADOOP-2649
                 URL: https://issues.apache.org/jira/browse/HADOOP-2649
             Project: Hadoop
          Issue Type: Bug
          Components: dfs
            Reporter: dhruba borthakur
             Fix For: 0.16.0


The HDFS Namenode computes replication work for datanodes once every 3 seconds. This should be a configurable  value. On large clusters, there could be many many blocks in the neededReplication queue and computing replication work for datanodes once every 3 seconds might consume lots of CPU on namenode.

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