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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6833) [WINDOWS] Java Milisecond precision on Windows
Date Wed, 19 Sep 2012 06:09:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13458439#comment-13458439

Elliott Clark commented on HBASE-6833:

Would taking a currentTimeMillis and the nanoTime at class instantiation allow us to create
an always increasing wall clock time.

we would have a startNano and a startMilli

return startMili + toMilli(startNano - System.nanoTime());

That has the potential to drift a little bit from wall time but should still be pretty close.
 And if we really need to stay close to wall time we can have a repeating timer that resets
startMilli and startNano.
> [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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