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From: S Ahmed <sahmed1020@gmail.com>
Date: Sat, 14 Jun 2014 17:10:36 -0400
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Subject: Re: if/when zookeeper goes down, how to recover?
To: user@hbase.apache.org
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Are there any 'best practices' when running zookeeper on ec2?  i.e. the
latency could be poor and hostname/ip addresses can also change when bring
a node up/down.


On Sat, Jun 14, 2014 at 10:13 AM, Ted Yu <yuzhihong@gmail.com> wrote:

> bq. what is the process do recover?
>
> You need to bring zookeeper nodes back as soon as possible.
>
> bq. will all clients reconnect or do you have to restart all servers?
>
> This depends on the release of hbase you're using and the duration which
> zookeeper ensemble is down.
> If the duration is longer than the value for zookeeper.session.timeout,
> region servers would go down.
>
> See also http://hbase.apache.org/book.html#zookeeper
>
>
> On Sat, Jun 14, 2014 at 6:31 AM, S Ahmed <sahmed1020@gmail.com> wrote:
>
> > Hello,
> >
> > If zookeeper goes down (all of them if you have 3/5 nodes), what is the
> > process do recover?
> >
> > If you simply bring back the zookeeper nodes, will all clients reconnect
> or
> > do you have to restart all servers?
> >
> > Thanks.
> >
>

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