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Posted to user@zookeeper.apache.org by JZ <jo...@jordanzimmerman.com> on 2012/06/27 22:34:27 UTC
ANN: Exhibitor 1.1.0
Exhibitor now supports Automatic Instance Management. Exhibitor can be configured to automatically add new instances to the ensemble and remove stale instances. This enables touchless and turn-key management of a ZooKeeper cluster.
When Automatic Instance Management is enabled:
* New instances will automatically add themselves to the ZooKeeper ensemble.
* Instances in the configured servers list that appear to be no longer operating will be removed from the ZooKeeper ensemble
Please see the Exhibitor wiki for more details: https://github.com/Netflix/exhibitor/wiki/Automatic-Instance-Management
-Jordan
Re: ANN: Exhibitor 1.1.0
Posted by Jordan Zimmerman <jo...@jordanzimmerman.com>.
Someone deleted the page - try now.
>How do you avoid obvious crazy cases like 5 new hosts jumping onto a cluster
>where all of the original hosts in the quorum are down for maintenance or something?
New instances are added into the cluster one at a time. So, if you wanted to add 5 new instances for some reason, it wouldn't break quorum. I don't follow your example, though, of 5 new hosts while the originals are down for maintenance.
The way Exhibitor accomplishes this is via shared configuration. The details of the rolling config change are here: https://github.com/Netflix/exhibitor/wiki/Rolling-Ensemble-Change (see the Details section).
-JZ
On Jun 27, 2012, at 6:48 PM, Ted Dunning wrote:
> That link seems to point to the what is exhibitor page.
>
> Can you explain how this feature is not fantastically dangerous? Do you have long time constants? How do you avoid obvious crazy cases like 5 new hosts jumping onto a cluster where all of the original hosts in the quorum are down for maintenance or something?
>
> Sent from my iPhone
>
> On Jun 27, 2012, at 4:34 PM, JZ <jo...@jordanzimmerman.com> wrote:
>
>> Exhibitor now supports Automatic Instance Management. Exhibitor can be configured to automatically add new instances to the ensemble and remove stale instances. This enables touchless and turn-key management of a ZooKeeper cluster.
>>
>> When Automatic Instance Management is enabled:
>>
>> * New instances will automatically add themselves to the ZooKeeper ensemble.
>> * Instances in the configured servers list that appear to be no longer operating will be removed from the ZooKeeper ensemble
>>
>> Please see the Exhibitor wiki for more details: https://github.com/Netflix/exhibitor/wiki/Automatic-Instance-Management
>>
>> -Jordan
Re: ANN: Exhibitor 1.1.0
Posted by Ted Dunning <te...@gmail.com>.
That link seems to point to the what is exhibitor page.
Can you explain how this feature is not fantastically dangerous? Do you have long time constants? How do you avoid obvious crazy cases like 5 new hosts jumping onto a cluster where all of the original hosts in the quorum are down for maintenance or something?
Sent from my iPhone
On Jun 27, 2012, at 4:34 PM, JZ <jo...@jordanzimmerman.com> wrote:
> Exhibitor now supports Automatic Instance Management. Exhibitor can be configured to automatically add new instances to the ensemble and remove stale instances. This enables touchless and turn-key management of a ZooKeeper cluster.
>
> When Automatic Instance Management is enabled:
>
> * New instances will automatically add themselves to the ZooKeeper ensemble.
> * Instances in the configured servers list that appear to be no longer operating will be removed from the ZooKeeper ensemble
>
> Please see the Exhibitor wiki for more details: https://github.com/Netflix/exhibitor/wiki/Automatic-Instance-Management
>
> -Jordan