Colin Patrick McCabe created HDFS-5092:
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             Summary: piggyback incremental cache reports on DN heartbeats
                 Key: HDFS-5092
                 URL: https://issues.apache.org/jira/browse/HDFS-5092
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Colin Patrick McCabe
            Priority: Minor


We should send incremental cache reports as part of DN heartbeats, similar to 
how we do incremental block reports.  Then we would only need to send full 
cache reports rarely (again similar to full block reports).

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