Redesign of QuorumCnxManager
Issue Type: Improvement
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
# 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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