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https://issues.apache.org/jira/browse/HDFS-5051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13739045#comment-13739045
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Suresh Srinivas commented on HDFS-5051:
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bq. In cache report, do we need to have block length and generation stamp or
just the block ID suffices?
I do not think this is captured in HDFS-5053. I also think that is not the
right place to do this change. Lets discuss if generation stamp and block
length is required in cache report in this jira. Based on the outcome we can
create another jira to address it.
> 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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