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From Ted Dunning <ted.dunn...@gmail.com>
Subject Re: Question on maintaining leader/membership status in zookeeper
Date Fri, 30 Apr 2010 19:24:59 GMT
There are a variety of situations that can trigger a new leader election and
a few that can cause the cluster to be unable to elect a new leader.
 Isolation of just the leader is one of the situations that will cause a new
leader election.  Isolation of nodes into groups smaller than the quorum
will result in the cluster freezing.

On Fri, Apr 30, 2010 at 11:56 AM, Lei Gao <lgao@linkedin.com> wrote:

> Hi,
>
> I have a general question on how zookeeper can maintain its view of the
> user cluster (that zookeeper manages) that is consistent with the nodes in
> the user cluster. In other words, when zookeeper considers the current
> leader is unavailable, does it really guarantee that a majority of nodes in
> the user cluster can’t reach the current leader? The same question applies
> to the membership service as well. Because the zookeeper can be partitioned
> from a majority of the nodes in the user cluster. How does the zookeeper
> handle situations like this?
>
> Thanks,
>
> Lei
>

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