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Date: Thu, 6 Apr 2017 19:24:41 +0000 (UTC)
From: "Zhe Zhang (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-14276) Add a nanosecond API to
 Time/Timer/FakeTimer
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archived-at: Thu, 06 Apr 2017 19:24:47 -0000


    [ 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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