re previous discussion see this thread:


Nick Dimiduk wrote:
I think automating this assignment has been discussed in the past. IIRC,
some combination of MAC address and pid or timestamp would be sufficient to
uniquely identify a ZK instance. There may be some detail I'm forgetting
about maintaining the ID between process restarts, making these ephemeral
values unacceptable.


On Mon, Mar 1, 2010 at 6:56 PM, Henry Robinson <> wrote:

If you have two servers with the same myid, two servers will identify
themselves as the 'same' machine X in a ZooKeeper ensemble. This id is used
to map onto a hostname / port pair where messages for a given server are
sent. Assuming a consistent quorum specification across all machines,
messages for server X will only go to one machine and the other will think
itself partitioned from the network.

Servers need ids to distinguish themselves from other servers in order to
break symmetry and successfully elect a leader.


On 27 February 2010 23:06, Qian Ye <> wrote:

myid is used to identify your service instance, with its help, it is
possible to start more than one Zookeeper service on one computer. If the
configuration of myid is wrong, the service can not be started properly.

On Sun, Feb 28, 2010 at 11:39 AM, Avinash Lakshman <> wrote:

Why is this important? What breaks down if I have 2 servers with the


With Regards!

Ye, Qian

Henry Robinson
Software Engineer

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