Alexander Shraer commented on ZOOKEEPER-2865:

Thanks [~jeffreyflukman]! 

We don't try to guarantee that every member of the new config receives the 
proposal message of a reconfiguration (only a quorum needs to ack) and don't 
wait until either of them receive the COMMIT before completing the reconfig (to 
be compatible with other ZK operations, I didn't want to introduce another 
round of message exchange).

But what's required is for the cluster to be able to recover from this state - 
the server that didn't get the commit in your scenario should find out about 
the new config and eventually join the cluster. If that doesn't happen then 
that potentially is a bug, but its not clear from the description here.

> Reconfig Causes Inconsistent Configuration file among the nodes
> ---------------------------------------------------------------
>                 Key: ZOOKEEPER-2865
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2865
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: leaderElection, quorum, server
>    Affects Versions: 3.5.3
>            Reporter: Jeffrey F. Lukman
>         Attachments: ZK-2865.pdf
> When we run our Distributed system Model Checking (DMCK) in ZooKeeper v3.5.3
> by following the workload in ZK-2778:
> - initially start 2 ZooKeeper nodes
> - start 3 new nodes
> - do a reconfiguration (the complete reconfiguration is attached in the 
> document)
> We think our DMCK found this following bug:
> - while one of the just joined nodes has not received the latest 
> configuration update 
> (called as node X), the initial leader node closed its port, 
> therefore causing the node X to be isolated.
> For complete information of the bug, please see the document that is attached.

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