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From Kevin Webb <kcw...@cs.ucsd.edu>
Subject Re: Partially partitioned connectivity
Date Thu, 29 Apr 2010 20:48:54 GMT
On Thu, 29 Apr 2010 13:24:45 -0700
Mahadev Konar <mahadev@yahoo-inc.com> wrote:

> Hi Kevin,
>   I had the response set up but didn't hit send. Ted already answered
> your question, but to give you a more technical background assuming
> that you know a little bit more about transaction ids in ZooKeeper
> and server ids:
> 
> If B and C are partitioned from each other, and A is the leader,
> there would not be a problem since A can talk to B and C and the
> cluster would continue functioning.
> 
> But if B/C is the Leader then the other would get disconnected and
> stop functioning unless the partition heals. The clients connected to
> this server will get disconnected with connected to the working
> quorum of A and B/C.
> 
> 
> If a quorum election happens in this situation, there are two
> possibilities
> 
> 1) A is the leader
> 2) A is not the leader
> 
> If A is not Leader either B or C is the leader and the quorum
> functions with the disconnected server not functioning.
> 
> If A is the leader then since it can talk to both B and C, all three
> servers will function and will work all fine.
> 
> Hope that answers your question.
> 
> Thanks
> mahadev

That's exactly what I was looking for.  Thanks to you and Ted both!

-Kevin

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