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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14276) Add a nanosecond API to Time/Timer/FakeTimer
Date Thu, 06 Apr 2017 19:24:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15959573#comment-15959573
] 

Zhe Zhang commented on HADOOP-14276:
------------------------------------

Thanks Erik. The analysis makes sense and +1 on the patch. Will wait for 2 hours before committing.

> Add a nanosecond API to Time/Timer/FakeTimer
> --------------------------------------------
>
>                 Key: HADOOP-14276
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14276
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: util
>            Reporter: Erik Krogen
>            Assignee: Erik Krogen
>            Priority: Minor
>         Attachments: HADOOP-14276.000.patch
>
>
> Right now {{Time}}/{{Timer}} export functionality for retrieving time at a millisecond-level
precision but not at a nanosecond-level precision, which is required for some applications
(there's ~70 usages). Most of these seem not to need mocking functionality for tests; only
one class currently mocks this out ({{LightWeightCache}}) but we would like to add another
as part of HDFS-11615 and want to avoid code duplication. This could be useful for other classes
in the future as well.



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