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Zookeeper >> mail # user >> adding/removing a zookeeper server


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Re: adding/removing a zookeeper server
Hi Mohammad,

Support for adding/removing servers as well as dynamic changes to
other parameters will be added as part of ZOOKEEPER-107, hopefully in
the 3.5.0 release.

Thanks,
Alex

On Thu, Apr 26, 2012 at 3:55 PM, Mohammad Abdul-Amir (Shamma)
<[EMAIL PROTECTED]> wrote:
> On Thu, Apr 26, 2012 at 2:48 PM, Jordan Zimmerman <[EMAIL PROTECTED]>wrote:
>
>> See #6 in the FAQ: http://wiki.apache.org/hadoop/ZooKeeper/FAQ
>>
>>
> Okay, it seems that a zookeeper "upgrade" is possible according to FAQ.
>
> Does removing/decommissioning a zookeeper server fall under the notion of
> "upgrade" though? Does "upgrade" apply to any zookeeper config update?
>
>
>> Also, FYI, we recently open sourced a ZooKeeper supervisor app that makes
>> these kinds of tasks simpler:
>>
>>        https://github.com/Netflix/exhibitor
>>
>> -Jordan
>>
>> On 4/26/12 2:46 PM, "Mohammad Abdul-Amir (Shamma)"
>> <[EMAIL PROTECTED]> wrote:
>>
>> >Hello,
>> >
>> >I have been searching through the zookeeper documentation and the web for
>> >information about reconfiguring a zookeeper ensemble. More precisely I am
>> >interested in adding/removing zookeeper servers to/from a zookeeper
>> >ensemble. Unfortunately, I could not find much information around,
>> >therefore I am bringing up the issue on this list.
>> >
>> >My questions are:
>> >
>> >- Is there a safe procedure to add a zookeeper server to a zookeeper
>> >ensemble?
>> >- Is there a safe procedure to remove a zookeeper server from an existing
>> >ensemble?
>> >
>> >Some posts I have read suggest that these operations are possible. The
>> >described procedure is to rewrite a new zookeeper configuration to all
>> >involved servers and to restart them. However, given that I could not find
>> >any information about how to carry out these two operations in zookeeper's
>> >documentation makes me nervous about relying on the described procedure.
>> >
>> >I would appreciate if anyone can point me to a different procedures to
>> >carry out add/remove operations, or convince me that it is safe to use the
>> >procedure described above. Safety for me is two-fold: zookeeper database
>> >can not get corrupted (unusable), and state updates can not get lost.
>> >
>> >--
>> >Mohammad Abdul-Amir (Shamma)
>>
>>
>
>
> --
> Mohammad Abdul-Amir (Shamma)