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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5197) Document dfs.cachereport.intervalMsec in hdfs-default.xml.
Date Sun, 15 Sep 2013 05:48:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13767700#comment-13767700
] 

Andrew Wang commented on HDFS-5197:
-----------------------------------

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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