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From: Ted Dunning <ted.dunning@gmail.com>
Date: Wed, 9 Apr 2014 12:06:19 -0700
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Subject: Re: Restarting leader zookeeper instance made quorum lost
To: "user@zookeeper.apache.org" <user@zookeeper.apache.org>
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Your email is a little ambiguous.

a) "5 instances with 3 as quorum" could mean 5 instances configured and
running normally.

Or

b) it could mean 5 instances with 2 instances that are down.

In (a) restarting the leader instance *should* cause the cluster to do a
leader election again and form a new quorum.  That is a form of losing
quorum.  If that is what you mean, this is normal.  A new quorum should be
formed and things should continue fairly soon.

In (b), restarting the leader will result in only 2 instances running which
is not enough to maintain quorum and until you have at least 3 nodes
running again, you can't proceed.


On Wed, Apr 9, 2014 at 11:03 AM, Bae, Jae Hyeon <metacret@gmail.com> wrote:

> Hi zookeeper users
>
> While rolling restart zookeeper cluster of 5 instances with 3 as quorum,
> restarting the leader instance made quorum lost. Is this expected?
> Otherwise, how can I restart the leader instance without interrupting whole
> cluster? Or is this fixed in 3.4.6?
>
> Thank you
> Best, Jae
>

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