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From Jérémy SEVELLEC <jsevel...@gmail.com>
Subject Re: weird problem with performance
Date Wed, 19 Oct 2011 18:31:05 GMT
Hi, what is your replication_factor?

2011/10/19 Yang <teddyyyy123@gmail.com>

> I'm using a cassandra version compiled from 1.0.0  github HEAD.
>
> I have 3 nodes, A B and C,  on node A I run a client, which talks only
> to B as the coordinator.
>
> the performance is pretty good, a QUORUM read+write  takes < 10ms.
>
> but then I shutdown C, quickly the performance starts to degrade, and
> QUORUM read+write time steadily increase to about 300ms.
>
> if I shutdown A and keep C, I observe the same effect.
>
>
> I understand that "2 out of 3" is going to give you faster response
> than "2 out of 2", but  the difference should not be that dramatic as
> 10ms vs 300ms.
>
> any possible reasons for this?(or how to debug this?)
>
> Thanks
> Yang
>



-- 
Jérémy

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