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https://issues.apache.org/jira/browse/HDFS-5378?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Patrick McCabe resolved HDFS-5378.
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Resolution: Fixed
Fix Version/s: HDFS-4949
> 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
> Fix For: HDFS-4949
>
> Attachments: HDFS-5378-caching.001.patch,
> HDFS-5378-caching.002.patch, HDFS-5378-caching.003.patch,
> HDFS-5378-caching.004.patch
>
>
> 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 to 3x what it could be).
> 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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