Flavio Junqueira commented on ZOOKEEPER-901:

It is a good point, Pat. It crossed my mind, but I thought it would be overkill 
to use netty. However, if it is simpler to have it for compatibility and 
uniformity purposes, then we should consider it.

> Redesign of QuorumCnxManager
> ----------------------------
>                 Key: ZOOKEEPER-901
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-901
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: leaderElection
>    Affects Versions: 3.3.1
>            Reporter: Flavio Junqueira
>            Assignee: Flavio Junqueira
>             Fix For: 3.4.0
> QuorumCnxManager manages TCP connections between ZooKeeper servers for leader 
> election in replicated mode. We have identified over time a couple of 
> deficiencies that we would like to fix. Unfortunately, fixing these issues 
> requires a little more than just generating a couple of small patches. More 
> specifically, I propose, based on previous discussions with the community, 
> that we reimplement QuorumCnxManager so that we achieve the following:
> # Establishing connections should not be a blocking operation, and perhaps 
> even more important, it shouldn't prevent the establishment of connections 
> with other servers;
> # Using a pair of threads per connection is a little messy, and we have seen 
> issues over time due to the creation and destruction of such threads. A more 
> reasonable approach is to have a single thread and a selector.  

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