Zookeeper should be tolerant of clock adjustments
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Key: ZOOKEEPER-1366
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1366
Project: ZooKeeper
Issue Type: Bug
Reporter: Ted Dunning
Fix For: 3.4.3
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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