Andrew Wang created HDFS-5320:
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             Summary: Add datanode caching metrics
                 Key: HDFS-5320
                 URL: https://issues.apache.org/jira/browse/HDFS-5320
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: datanode
    Affects Versions: HDFS-4949
            Reporter: Andrew Wang
            Assignee: Andrew Wang
            Priority: Minor


It'd be good to hook up datanode metrics for # (blocks/bytes) 
(cached/uncached/failed to cache) over different time windows 
(eternity/1hr/10min/1min).



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