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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6093) Expose more caching information for debugging by users
Date Thu, 20 Mar 2014 19:22:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13942169#comment-13942169
] 

Arpit Agarwal commented on HDFS-6093:
-------------------------------------

+1 from me, nice diagnosability improvements.

> 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, hdfs-6093-2.patch, hdfs-6093-3.patch, hdfs-6093-4.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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