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.
Cheers, -Nick On Mon, Mar 1, 2010 at 6:56 PM, Henry Robinson <he...@cloudera.com> 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. > > Henry > > On 27 February 2010 23:06, Qian Ye <yeqian....@gmail.com> 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 < > > avinash.laksh...@gmail.com> wrote: > > > > > Why is this important? What breaks down if I have 2 servers with the > same > > > myId? > > > > > > Cheers > > > A > > > > > > > > > > > -- > > With Regards! > > > > Ye, Qian > > > > > > -- > Henry Robinson > Software Engineer > Cloudera > 415-994-6679 >
