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Posted to user@hbase.apache.org by S Ahmed <sa...@gmail.com> on 2014/06/14 15:31:28 UTC
if/when zookeeper goes down, how to recover?
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.
Re: if/when zookeeper goes down, how to recover?
Posted by Ted Yu <yu...@gmail.com>.
Cycling old bits:
http://search-hadoop.com/m/WsPol11E4ss1/Zookeeper+ec2&subj=Best+practices+for+using+zookeeper+in+an+Amazon+EC2+environment
On Jun 14, 2014, at 2:10 PM, S Ahmed <sa...@gmail.com> wrote:
> 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 <yu...@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 <sa...@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.
>>
Re: if/when zookeeper goes down, how to recover?
Posted by S Ahmed <sa...@gmail.com>.
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 <yu...@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 <sa...@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.
> >
>
Re: if/when zookeeper goes down, how to recover?
Posted by Ted Yu <yu...@gmail.com>.
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 <sa...@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.
>