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From "Chetna Chaudhari (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14713) Audit for durations that should be measured via Time.monotonicNow
Date Wed, 20 Sep 2017 03:29:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16172672#comment-16172672
] 

Chetna Chaudhari commented on HADOOP-14713:
-------------------------------------------

[~jlowe], [~templedf]: I created few sub-tasks for classes which needs this change. Also,
I noticed that, change needs to be done in many test cases. Should I create sub-task per test,
or a generic task covering all test cases will be ok? Please advice. 

> Audit for durations that should be measured via Time.monotonicNow
> -----------------------------------------------------------------
>
>                 Key: HADOOP-14713
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14713
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Jason Lowe
>              Labels: newbie
>
> Whenever we are measuring a time delta or duration in the same process, the timestamps
probably should be using Time.monotonicNow rather than Time.now or System.currentTimeMillis.
 The latter two are directly reading the system clock which can move faster or slower than
actual time if the system is undergoing a time adjustment (e.g.: adjtime or admin sets a new
system time).
> We should go through the code base and identify places where the code is using the system
clock but really should be using monotonic time.



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