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https://issues.apache.org/jira/browse/HDFS-6093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13935770#comment-13935770
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Andrew Wang commented on HDFS-6093:
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Hey Arpit,
So the confusing thing about these stats is how the pool and directive stats
are only updated when the CacheReplicationMonitor runs (default every 5 mins).
The datanode-level stats are updated on the heartbeat, so much more frequent. I
think if you wait for a CRM run, it'll then show up in listPools.
I was considering lowering the default CRM interval for this reason, maybe to 1
min or 30s, for this reason.
> Expose more caching information for debugging by users
> ------------------------------------------------------
>
> Key: HDFS-6093
> URL: https://issues.apache.org/jira/browse/HDFS-6093
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: caching
> Affects Versions: 2.4.0
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Attachments: hdfs-6093-1.patch
>
>
> When users submit a new cache directive, it's unclear if the NN has
> recognized it and is actively trying to cache it, or if it's hung for some
> other reason. It'd be nice to expose a "pending caching/uncaching" count the
> same way we expose pending replication work.
> It'd also be nice to display the aggregate cache capacity and usage in
> dfsadmin -report, since we already have have it as a metric and expose it
> per-DN in report output.
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