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From Henry Robinson <he...@cloudera.com>
Subject Re: the error
Date Wed, 31 Mar 2010 20:12:30 GMT
Using two machines running ZK will actually decrease your reliability
>> compared to using a single machine.  Consider using one machine or three.
>>
>
> ?
>
> Not meaning to pull the thread off-topic, but I don't understand why this
> should be the case.  Can you elaborate?
>
>
With majority-based quorums, a 2 node ensemble will fail if either machine
fails. This is the same as a 1 node ensemble - if one machine fails, the
ensemble fails.

But with the 2 nodes, you have (roughly) double the probability of
experiencing a single failure, with the same failure profile.

cheers,
Henry


> Thanks,
>
> DR
>



-- 
Henry Robinson
Software Engineer
Cloudera
415-994-6679

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