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https://issues.apache.org/jira/browse/HDFS-6093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13935777#comment-13935777
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Colin Patrick McCabe commented on HDFS-6093:
--------------------------------------------
bq. I was considering lowering the default CRM interval for this reason, maybe
to 1 min or 30s, for this reason.
Yeah, maybe we should set it to 30 seconds for now to get a better user
experience. We can always raise it if a performance issues emerges on a big
cluster.
> 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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