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Posted to hdfs-issues@hadoop.apache.org by "Andrew Wang (JIRA)" <ji...@apache.org> on 2012/06/21 20:00:45 UTC

[jira] [Updated] (HDFS-3343) Improve metrics for DN read latency

     [ https://issues.apache.org/jira/browse/HDFS-3343?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Wang updated HDFS-3343:
------------------------------

    Attachment: hdfs-3343.patch

Added the two metrics. No test cases, but I verified by starting up a 1-node cluster and doing some reads to make sure the counters incremented.
                
> 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.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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