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From Matt Brown <Matthew.Br...@citrix.com>
Subject Re: Imposing ZooKeeper ensemble leader.
Date Fri, 18 Apr 2014 16:54:40 GMT
Another thing you could try is to send the "stat" command to each server
in your ensemble. On a leader it will return "Mode: leader" versus "Mode:
follower" for a follower.

Of course it's not necessarily guaranteed that the leader at the start of
the test will stay the leader throughout.

$ echo stat | nc zookeeper1 2181
Zookeeper version: 3.4.5-107--1, built on 05/20/2013 06:34 GMT

Latency min/avg/max: 0/0/390
Received: 2334607
Sent: 2631466
Connections: 2
Outstanding: 0
Zxid: 0x90032f244
Mode: leader
Node count: 61

On 4/18/14, 10:43 AM, "Paolo Viotti" <paolo.viotti@eurecom.fr> wrote:

>I've solved this by implementing a simple leader election algorithm that
>elects as leader the quorum peer with smallest id.
>Thanks anyway.
>Best regards,
>On 18/04/2014 13:05, Paolo Viotti wrote:
>> Hello,
>> I'm running some performance experiments which involve ZooKeeper.
>> In order to simplify things I'd like to point all clients to the same
>> server, and, most importantly, I'd like that server to be the leader
>> of the ensemble.
>> So I was wondering: is there a way to choose and impose a leader of
>> the ensemble (thus bypassing the leader election algorithm)..?
>> Thanks in advance.
>> Kind regards,
>> Paolo

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