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https://issues.apache.org/jira/browse/HDFS-7923?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HDFS-7923 started by Charles Lamb.
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> The DataNodes should rate-limit their full block reports by asking the NN on 
> heartbeat messages
> -----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-7923
>                 URL: https://issues.apache.org/jira/browse/HDFS-7923
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Colin Patrick McCabe
>            Assignee: Charles Lamb
>         Attachments: HDFS-7923.000.patch
>
>
> The DataNodes should rate-limit their full block reports.  They can do this 
> by first sending a heartbeat message to the NN with an optional boolean set 
> which requests permission to send a full block report.  If the NN responds 
> with another optional boolean set, the DN will send an FBR... if not, it will 
> wait until later.  This can be done compatibly with optional fields.



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