In our case, two brokers were offline. When the first broker was offline,
that would trigger a rebalance. When the second broker was offline, if the 
consumers were in the process of rebalance, what do we expect? Is the 
second rebalance request queued? 

Regards,

Libo


-----Original Message-----
From: Guozhang Wang [mailto:wangg...@gmail.com] 
Sent: Friday, February 14, 2014 7:33 PM
To: users@kafka.apache.org
Subject: Re: broker offline

Hello Libo,

When ZK resumes from a soft failure, like a GC, it will mark the ephemeral 
nodes as session timed out, and the brokers will try to re-register upon 
receiving the session timeout. You can re-produce this issue by signal pause 
the ZK process.

Guozhang


On Fri, Feb 14, 2014 at 12:15 PM, Yu, Libo <libo...@citi.com> wrote:

> Hi team,
>
> We have three brokers on our production cluster. I noticed two of them 
> somehow got offline and then re-registered with zookeeper and got back 
> online. It seems the issue was caused by some zookeeper issue. So I 
> want to know what may be the possible cases of the issue. If I want to 
> reproduce the issue, is there any way to do it? Thanks.
>
> Regards,
>
> Libo
>
>


--
-- Guozhang

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