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https://issues.apache.org/jira/browse/ZOOKEEPER-851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925170#action_12925170
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Vishal K commented on ZOOKEEPER-851:
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going once, going twice ... :)

> ZK lets any node to become an observer
> --------------------------------------
>
>                 Key: ZOOKEEPER-851
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-851
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: quorum, server
>    Affects Versions: 3.3.1
>            Reporter: Vishal K
>            Priority: Critical
>             Fix For: 3.4.0
>
>
> I had a 3 node cluster running. The zoo.cfg on each contained 3 entries as 
> show below:
> tickTime=2000
> dataDir=/var/zookeeper
> clientPort=2181
> initLimit=5
> syncLimit=2
> server.0=10.150.27.61:2888:3888
> server.1=10.150.27.62:2888:3888
> server.2=10.150.27.63:2888:3888
> I wanted to add another node to the cluster. In fourth node's zoo.cfg, I 
> created another entry for that node and started zk server. The zoo.cfg on the 
> first 3 nodes was left unchanged. The fourth node was able to join the 
> cluster even though the 3 nodes had no idea about the fourth node.
> zoo.cfg on fourth node:
> tickTime=2000
> dataDir=/var/zookeeper
> clientPort=2181
> initLimit=5
> syncLimit=2
> server.0=10.150.27.61:2888:3888
> server.1=10.150.27.62:2888:3888
> server.2=10.150.27.63:2888:3888
> server.3=10.17.117.71:2888:3888
> It looks like 10.17.117.71 is becoming an observer in this case. I was 
> expecting that the leader will reject 10.17.117.71.
> # telnet 10.17.117.71 2181
> Trying 10.17.117.71...
> Connected to 10.17.117.71.
> Escape character is '^]'.
> stat
> Zookeeper version: 3.3.0--1, built on 04/02/2010 22:40 GMT
> Clients:
>  /10.17.117.71:37297[1](queued=0,recved=1,sent=0)
> Latency min/avg/max: 0/0/0
> Received: 3
> Sent: 2
> Outstanding: 0
> Zxid: 0x200000065
> Mode: follower
> Node count: 288

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