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https://issues.apache.org/jira/browse/HDFS-3343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13399024#comment-13399024
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Andrew Wang commented on HDFS-3343:
-----------------------------------
Made suggested changes, with a few differences.
-Since transferTo both reads from disk and writes to the network, I called that
metric "SendDataPacketTransferNanos". Other one is
"SendDataPacketBlockedOnNetworkNanos".
-Used System.nanoTime() for doing more accurate timing, so it's nano rather
than microseconds.
> 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
> Attachments: hdfs-3343-2.patch, hdfs-3343.patch
>
>
> 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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