[jira] [Created] (HDFS-5378) In CacheReport, don't send genstamp and length on the wire

["Colin Patrick McCabe (JIRA)" <ji...@apache.org>]

Colin Patrick McCabe created HDFS-5378:
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             Summary: In CacheReport, don't send genstamp and length on the wire
                 Key: HDFS-5378
                 URL: https://issues.apache.org/jira/browse/HDFS-5378
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: datanode
    Affects Versions: HDFS-4949
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe


As discussed in HDFS-5096, we don't need genstamp and block length when processing cache reports.  So let's not send them over the wire (it increases the size of cache reports by 3x).

Also, we should report the caching statistics alongside the normal DN stats in {{StorageReport}}.  There's no reason for them to be separate.  Since the new fields will be optional and default to 0, there will be no extra overhead in the non-caching case.



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