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From Bill Graham <billgra...@gmail.com>
Subject Re: multiple masters
Date Fri, 28 Jan 2011 21:15:57 GMT
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?


On Fri, Jan 28, 2011 at 9:31 AM, Weishung Chung <weishung@gmail.com> wrote:
> Great, thank you :D
> I guess I need to read up more on zookeeper.
>
> On Fri, Jan 28, 2011 at 10:56 AM, Stack <stack@duboce.net> wrote:
>
>> On Fri, Jan 28, 2011 at 8:52 AM, Weishung Chung <weishung@gmail.com>
>> wrote:
>> > Correct me if I am wrong :)
>> > In HConnectionManager, it seems to me that a zookeeper instance is used
>> to
>> > get to the HBase master for META and ROOT info. What would happen if
>> HBase
>> > master became unavailable? Would zookeeper be able to get the ROOT and
>> META
>> > info from another backup/replicated master? Sorry because I haven't got a
>> > chance to browse deeper in the zookeeper codes yet :(
>> >
>>
>> The locations of root is kept in zk and that of meta in the root
>> region, not in master.  If master goes away, cluster continues to run.
>> St.Ack
>>
>

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