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https://issues.apache.org/jira/browse/HADOOP-2326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12547374
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dhruba borthakur commented on HADOOP-2326:
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And it would be nice if the backoff period is somehow dependent on either 
namenode load and/or cluster size.

> Add a Random backoff for the initial block report sent to the Name node
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-2326
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2326
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Sanjay Radia
>            Assignee: Sanjay Radia
>             Fix For: 0.16.0
>
>
> Startup time can be improved if the initial block reports are spread randomly 
> over small period of time.

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