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https://issues.apache.org/jira/browse/HADOOP-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12560570#action_12560570 ]
dhruba borthakur commented on HADOOP-2649:
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Hi hairong, thanks for ur review comments. I plan to make this period dymanic (as per your suggestion) in the jira that is linked to this issue HADOOP-2606.
> The ReplicationMonitor sleep period should be configurable
> ----------------------------------------------------------
>
> Key: HADOOP-2649
> URL:
https://issues.apache.org/jira/browse/HADOOP-2649> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Fix For: 0.16.0
>
> Attachments: configurableReplicationPeriod.patch
>
>
> 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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