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Posted to hdfs-issues@hadoop.apache.org by "Haohui Mai (JIRA)" <ji...@apache.org> on 2014/04/12 02:20:16 UTC

[jira] [Commented] (HDFS-6236) ImageServlet should use Time#monotonicNow to measure latency.

    [ https://issues.apache.org/jira/browse/HDFS-6236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13967284#comment-13967284 ] 

Haohui Mai commented on HDFS-6236:
----------------------------------

+1 pending jenkins.

> ImageServlet should use Time#monotonicNow to measure latency.
> -------------------------------------------------------------
>
>                 Key: HDFS-6236
>                 URL: https://issues.apache.org/jira/browse/HDFS-6236
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 3.0.0, 2.4.0
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>            Priority: Minor
>         Attachments: HDFS-6236.1.patch
>
>
> {{ImageServlet}} currently uses {{Time#now}} to get file transfer latency measurements and pass them to the metrics system.  It would be preferrable to use {{Time#monotonicNow}} so that we're using the most precise available system timer, and we're not subject to odd bugs that could result in negative latency measurements, like resetting the system clock.



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