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From Jared Cantwell <jared.cantw...@gmail.com>
Subject Re: A few questions on zookeeper
Date Tue, 07 Dec 2010 01:19:01 GMT

For your second point, take a look at
https://issues.apache.org/jira/browse/ZOOKEEPER-107.  Unfortunately,
Zookeeper does not support this feature yet.


On Mon, Dec 6, 2010 at 10:43 AM, David Alves <davidralves@gmail.com> wrote:

> Hi
>        I'm a recent user of zookeeper (awesome work btw) and although I've
> (most of) the wiki and already have some running code I still have some
> questions.
>        1- Feasibility of a two node cluster:
>                Q- I know zookeeper runs over (a approx. version of) paxos
> and tolerates f failures in 2f+1 nodes but would it be possible to use in a
> 2 server + 1 quorum disk deployment (much like windows clusters do)? The
> objective would be to use ZK  both for distributed (processing nodes >2) and
> single processing node (2 nodes active-passive) highly available
> deployments.
>        2- Meta-ZK cluster group membership/management.
>                Zk already provides a group membership construct by allowing
> to register/unregister ephemeral nodes and by deleting them on failed
> sessions, but would it be possible to do so for the actual zookeeper
> ensemble? For instance I'd like to make nodes add themselves to the ZK
> ensemble based on its size (for instance keep adding nodes based if ensemble
> size < 5) and if a node that is part of the ensemble fails then a new node
> would take its place. Is this possible?
> Regards
> David

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