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From <Alexandar.Gvozdeno...@ubs.com>
Subject RE: Possible issue with cluster availability following new Leader Election - ZK 3.4
Date Thu, 10 May 2012 14:48:39 GMT
Cheers - Raised https://issues.apache.org/jira/browse/ZOOKEEPER-1465

 

-----Original Message-----
From: Camille Fournier [mailto:camille@apache.org] 
Sent: 10 May 2012 14:58
To: user@zookeeper.apache.org
Subject: Re: Possible issue with cluster availability following new Leader Election - ZK 3.4

I will take a look at this soon, have you created a Jira for it? If not please do so.

Thanks,
C

On Thu, May 10, 2012 at 7:20 AM,  <Alexandar.Gvozdenovic@ubs.com> wrote:
> I think there may be a problem here with the 3.4 branch. I dropped the 
> cluster back to 3.3.5 and the behaviour was much better.
>
> To summarize:
>
> 650mb of data
> 20k nodes of varied size
> 3 node cluster
>
> On 3.4.x (using latest branch build)
> ---------
> Takes 3-4 minutes to bring up a cluster from cold Takes 40-50 secs to 
> recover from a leader failure Takes 10 secs for a new follower to join 
> the cluster
>
> On 3.3.5
> --------
> Takes 10-20 secs to bring up a cluster from cold Takes 10 secs to 
> recover from a leader failure Takes 10 secs for a new follower to join 
> the cluster
>
> Any views on this from the ZK devs? The differences in behaviour only 
> start becoming apparent as the dataset gets bigger.
> I was hoping to use 3.4 for the transactional features it offered via 
> the 'multi-update' operations, but this issue seems pretty serious...
>
>
>
> Visit our website at http://www.ubs.com
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