December 2023
Intermediate to advanced
464 pages
12h 36m
English
Content preview from Patterns of Distributed Systems
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Chapter 30
Single-Socket Channel
Maintain the order of the requests sent to a server by using a single TCP connection.
Problem
When 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 connections doesn’t increase the system’s latency.
Solution
Fortunately, the long-used and widely available TCP protocol provides all these necessary characteristics. We can get what we need by ensuring all communication between a follower and its leader goes through a single-socket channel (Figure 30.1). The follower then serializes the updates from the leader using a ...
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