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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3343) Improve metrics for DN read latency
Date Tue, 03 Jul 2012 20:44:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406022#comment-13406022
] 

Andrew Wang commented on HDFS-3343:
-----------------------------------

Of the four listed failed unit tests, the first three are almost certainly unrelated and passed
for me locally, and the 4th I think is just flaky. I tried it on trunk, and it still failed
erratically.
                
> 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-3343-3.patch, hdfs-3343-4.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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