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https://issues.apache.org/jira/browse/HDFS-10917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15713564#comment-15713564
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Xiaobing Zhou commented on HDFS-10917:
--------------------------------------

Posted v000 patch.
* added these peer metrics:
** sendPacketDownstreamTimeNanos
** sendAckToUpstreamTimeNanos
** writeDataToDiskTimeNanos
** syncWriterOsCacheTimeNanos
** flushOrSyncBlockTimeNanos
** writeChecksumToDiskTimeNanos

Will add tests for syncWriterOsCacheTimeNanos and writeDataToDiskTimeNanos in 
upcoming patches.

> Collect peer performance statistics on DataNode.
> ------------------------------------------------
>
>                 Key: HDFS-10917
>                 URL: https://issues.apache.org/jira/browse/HDFS-10917
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.8.0
>            Reporter: Xiaobing Zhou
>            Assignee: Xiaobing Zhou
>         Attachments: HDFS-10917.000.patch
>
>
> DataNodes already detect if replication pipeline operations are slow and log 
> warnings. For the purpose of analysis, performance metrics are desirable. 
> This proposes adding them on DataNodes. 



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