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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6833) [WINDOWS] Java Milisecond precision on Windows
Date Wed, 19 Sep 2012 05:25:08 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13458419#comment-13458419
] 

Lars Hofhansl commented on HBASE-6833:
--------------------------------------

We need to keep in mind then that nanotime does not reflect any absolute time and is only
supposed to be used for time-differences. As long we make sure it'll only ever used for that,
we should be OK.

I.e. we could not take nanotime, and use that for the persistent KV timestamps.
(Going the documentation and what I have read elsewhere)
                
> [WINDOWS] Java Milisecond precision on Windows
> ----------------------------------------------
>
>                 Key: HBASE-6833
>                 URL: https://issues.apache.org/jira/browse/HBASE-6833
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 0.96.0, 0.94.3
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>              Labels: windows
>
> HBase relies on the system clock obtained by System.currentTimeMilis() to supply the
version, if it is not provided by the client in Put's and Delete's. At HBASE-6832 and HBASE-6826,
we discovered that on some platforms, the milis clock might not be updated every milisecond,
which might cause unexpected behavior. We also did some preliminary analysis there.
> In this issue, we can further discuss and inspect whether it is a problem for main target
platforms and if so what can be done.

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