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From "Asad Saeed (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-1366) Zookeeper should be tolerant of clock adjustments
Date Tue, 03 Sep 2013 23:11:53 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13757211#comment-13757211
] 

Asad Saeed commented on ZOOKEEPER-1366:
---------------------------------------

These patches will break Kerberos login. It mixes monotonic and actual time.
                
> Zookeeper should be tolerant of clock adjustments
> -------------------------------------------------
>
>                 Key: ZOOKEEPER-1366
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1366
>             Project: ZooKeeper
>          Issue Type: Bug
>            Reporter: Ted Dunning
>            Assignee: Ted Dunning
>             Fix For: 3.5.0
>
>         Attachments: ZOOKEEPER-1366-3.3.3.patch, ZOOKEEPER-1366.patch, ZOOKEEPER-1366.patch,
ZOOKEEPER-1366.patch, ZOOKEEPER-1366.patch, ZOOKEEPER-1366.patch, ZOOKEEPER-1366.patch, ZOOKEEPER-1366.patch,
zookeeper-3.4.5-ZK1366-SC01.patch
>
>
> If you want to wreak havoc on a ZK based system just do [date -s "+1hour"] and watch
the mayhem as all sessions expire at once.
> This shouldn't happen.  Zookeeper could easily know handle elapsed times as elapsed times
rather than as differences between absolute times.  The absolute times are subject to adjustment
when the clock is set while a timer is not subject to this problem.  In Java, System.currentTimeMillis()
gives you absolute time while System.nanoTime() gives you time based on a timer from an arbitrary
epoch.
> I have done this and have been running tests now for some tens of minutes with no failures.
 I will set up a test machine to redo the build again on Ubuntu and post a patch here for
discussion.

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