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https://issues.apache.org/jira/browse/ZOOKEEPER-1616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13547649#comment-13547649
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Ted Dunning commented on ZOOKEEPER-1616:
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Uh...
I thought we patched this ages ago.
See ZOOKEEPER-1366
> time calculations should use a monotonic clock
> ----------------------------------------------
>
> Key: ZOOKEEPER-1616
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1616
> Project: ZooKeeper
> Issue Type: Bug
> Reporter: Todd Lipcon
>
> We recently had an issue with ZooKeeper sessions acting strangely due to a
> bad NTP setup on a set of hosts. Looking at the code, ZK seems to use
> System.currentTimeMillis to measure durations or intervals in many places.
> This is bad since that time can move backwards or skip ahead by several
> minutes. Instead, it should use System.nanoTime (or a wrapper such as Guava's
> Stopwatch class)
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