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https://issues.apache.org/jira/browse/HADOOP-10633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14741174#comment-14741174
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Steve Loughran commented on HADOOP-10633:
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Actually, it'd have to be -1 to using monotonic now for tokens. If I set the
time on a machine back, I'd expect new tokens to have an expiry time relative
to the new time; use monotonic time and they'd be valid for longer than you
expect
> use Time#monotonicNow to avoid system clock reset
> -------------------------------------------------
>
> Key: HADOOP-10633
> URL: https://issues.apache.org/jira/browse/HADOOP-10633
> Project: Hadoop Common
> Issue Type: Improvement
> Components: io, security
> Affects Versions: 3.0.0
> Reporter: Liang Xie
> Assignee: Liang Xie
> Labels: BB2015-05-TBR
> Attachments: HADOOP-10633.txt
>
>
> let's replace System#currentTimeMillis with Time#monotonicNow
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