[jira] [Assigned] (HBASE-21774) do not use currentTimeMillis to measure intervals

["Duo Zhang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-21774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Duo Zhang reassigned HBASE-21774:
---------------------------------

    Assignee: Dmitriy Kuharev

> do not use currentTimeMillis to measure intervals
> -------------------------------------------------
>
>                 Key: HBASE-21774
>                 URL: https://issues.apache.org/jira/browse/HBASE-21774
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Dmitriy Kuharev
>            Priority: Minor
>
> I've noticed it in a few places in the code... 
> currentMillis can go backwards and have other artifacts.
> nanoTime should be used for intervals (see [https://docs.oracle.com/javase/7/docs/api/java/lang/System.html#nanoTime()|https://docs.oracle.com/javase/7/docs/api/java/lang/System.html#nanoTime()] ) unless it's both the case that the calls are frequent and nanoTime will result in perf overhead, and also that artifacts from negative intervals and such are relatively harmless or possible to work around in the code.



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