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Zookeeper, mail # user - Restarting leader zookeeper instance made quorum lost


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Re: Restarting leader zookeeper instance made quorum lost
Ted Dunning 2014-04-09, 21:23
On Wed, Apr 9, 2014 at 12:56 PM, Bae, Jae Hyeon <[EMAIL PROTECTED]> wrote:
Yes.

No.

You have to always have 3 ZK nodes live in order to maintain continuous
operation.

Rolling restart implies that you wait long enough after restarting each
node so that it has a chance to rejoin the quorum.  If you do that then
restarting the leader will result in a tiny moment when writes will not be
accepted and may require some ZK clients to transparently reconnect to a
different ZK node, but it should be hard to detect any outage.