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https://issues.apache.org/jira/browse/HDFS-5197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13767700#comment-13767700
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Andrew Wang commented on HDFS-5197:
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Hey Chris, thanks for spotting this, just a few clarifications:
* Technically, the heartbeat does not contain the cache report since they are
separate RPCs, so I'd like to distinguish them.
* I think it's unnecessary to mention the cache/uncache DN commands here,
better to focus on the cache report itself (e.g. "full report of the cache
state on the datanode", "used to update the map of cached blocks to datanode
locations on the NameNode"). We'll have proper documentation for all of this
later.
I realize I also forgot to document the NN property added in HDFS-5053,
"dfs.namenode.caching.enabled", do you mind putting some doc in for that as
well?
+1 after these are addressed.
> Document dfs.cachereport.intervalMsec in hdfs-default.xml.
> ----------------------------------------------------------
>
> Key: HDFS-5197
> URL: https://issues.apache.org/jira/browse/HDFS-5197
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode, documentation
> Affects Versions: HDFS-4949
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
> Priority: Minor
> Attachments: HDFS-5197.1.patch
>
>
> We can add a description of {{dfs.cachereport.intervalMsec}} to
> hdfs-default.xml.
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