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From Jordan Zimmerman <jor...@jordanzimmerman.com>
Subject Re: leader election, scheduled tasks, losing leadership
Date Sun, 09 Dec 2012 04:52:54 GMT
You might check your leader implementation. Writing a correct leader recipe is actually quite
challenging due to edge cases. Have a look at Curator (disclosure: I wrote it) for an example.

-JZ

On Dec 8, 2012, at 8:49 PM, Eric Pederson <ericacm@gmail.com> wrote:

> Actually I had the same thought and didn't consider having to do this until
> I talked about my project at a Zookeeper User Group a month or so ago and I
> was given this advice.
> 
> I know that I do see leadership being lost/transferred when one of the ZK
> servers is restarted (not the whole ensemble).   And it seems like I've
> seen it happen even when the ensemble stays totally stable (though I am not
> 100% sure as it's been a while since I have worked on this particular
> application).
> 
> 
> 
> -- Eric
> 
> 
> 
> On Sat, Dec 8, 2012 at 11:25 PM, Jordan Zimmerman <
> jordan@jordanzimmerman.com> wrote:
> 
>> Why would it lose leadership? The only reason I can think of is if the ZK
>> cluster goes down. In normal use, the ZK cluster won't go down (I assume
>> you're running 3 or 5 instances).
>> 
>> -JZ
>> 
>> On Dec 8, 2012, at 8:17 PM, Eric Pederson <ericacm@gmail.com> wrote:
>> 
>>> During the time the task is running a cluster member could lose its
>>> leadership.
>> 
>> 


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