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https://issues.apache.org/jira/browse/HDFS-3343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13398048#comment-13398048
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Todd Lipcon commented on HDFS-3343:
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I was thinking the latter, most likely.
> Improve metrics for DN read latency
> -----------------------------------
>
> Key: HDFS-3343
> URL: https://issues.apache.org/jira/browse/HDFS-3343
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Reporter: Todd Lipcon
> Assignee: Andrew Wang
>
> Similar to HDFS-3170 on the write side, we should improve the metrics that
> are generated on the DN for read latency. We should have separate metrics for
> the time spent in {{transferTo}} vs {{waitWritable}} so that it's easy to
> distinguish slow local disks from slow readers on the other end of the socket.
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