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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