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https://issues.apache.org/jira/browse/HDFS-5051?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang updated HDFS-5051:
------------------------------

    Attachment: hdfs-5051-2.patch

Cool, new patch addresses your review comments. Using {{monotonicNow}} means 
it's now a bit decoupled from heartbeats, but probably fine. I also changed the 
default interval to 10s. We have plans to make it incremental or adaptive (NN 
triggered?) down the road, so this'll likely change.
                
> Propagate cache status information from the DataNode to the NameNode
> --------------------------------------------------------------------
>
>                 Key: HDFS-5051
>                 URL: https://issues.apache.org/jira/browse/HDFS-5051
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, namenode
>            Reporter: Colin Patrick McCabe
>            Assignee: Andrew Wang
>         Attachments: hdfs-5051-1.patch, hdfs-5051-2.patch
>
>
> The DataNode needs to inform the NameNode of its current cache state. Let's 
> wire up the RPCs and stub out the relevant methods on the DN and NN side.

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