Distributed Systems Pattern: Single Socket Channel

When we are using Leader and Followers, we need to ensure that messages
between the leader and each follower are kept in order, with a retry
mechanism for any lost messages. We need to do this while keeping the cost
of new connections low, so that opening new connections doesn't increase
the system's latency. A Single Socket Channel maintains the order of the
requests sent to a server by using a single TCP connection

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