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https://issues.apache.org/jira/browse/ZOOKEEPER-901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14747035#comment-14747035
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Akihiro Suda commented on ZOOKEEPER-901:
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ZOOKEEPER-2080 seems related.
Hi [~hdeng], is there any update?
Please tell me if I can be of any help.
> 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: Hongchao Deng
> Fix For: 3.6.0
>
>
> 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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