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

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

     [ https://issues.apache.org/jira/browse/HDFS-5378?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Colin Patrick McCabe resolved HDFS-5378.
----------------------------------------

       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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