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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6093) Expose more caching information for debugging by users
Date Wed, 12 Mar 2014 00:58:49 GMT
Andrew Wang created HDFS-6093:
---------------------------------

             Summary: 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


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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