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From Bill Graham <billgra...@gmail.com>
Subject Re: multiple masters
Date Fri, 28 Jan 2011 23:29:35 GMT
Thanks Stack, this is really helpful.

On Fri, Jan 28, 2011 at 2:06 PM, Stack <stack@duboce.net> wrote:
> On Fri, Jan 28, 2011 at 1:15 PM, Bill Graham <billgraham@gmail.com> wrote:
>> I also don't have a solid understanding of the responsibilities of
>> master, but it seems like it's job is really about managing regions
>> (i.e., coordinating splits and compactions, etc.) and updating ROOT
>> and META. Is that correct?
>>
>>
>
> Yes.  It hosts the balancer and does bootsrapping on cluster startup
> doing bulk initial assign.  On server crash, it runs the recovery
> splitting WAL logs and getting regions back on line again.
>
> It does not run splits.  That is done by the regionservers themselves.
>  Regionservers inform master of the split when done so it can take
> account of new state when running balancer.
>
> We should do a write up on this.  Let me put this on the doc queue.
>
> St.Ack
>

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