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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2649) The ReplicationMonitor sleep period should be configurable
Date Fri, 18 Jan 2008 22:08:34 GMT

    [ 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:
------------------------------------------

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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