![]() Sending fewer bits is more bandwidth-efficient and reduces overall costs and latencies for our customers. This means subscribers receive only the changes since the last update instead of the entire stream. Table of contentsįor Ably customers like Tennis Australia or HubSpot, Message Delta Compression reduces the bandwidth required to transmit realtime messages by sending only the diff of a message. The purpose of this article is not to detail how Ably programmatically implemented a diff algorithm across its distributed pub/sub messaging platform, but rather to share our research and support a better understanding of diff algorithms that could be useful to implementers of diff/delta/patch functionality. Having said that there is very limited knowledge on the subject across the developer community. Git is one example where a developer can read, commit, pull, and merge diffs without ever understanding the underlying diff algorithm. ![]() Yet understanding the inner workings of diff algorithms is rarely necessary to use said tools. ![]() ![]() These algorithms are the basis of a number of commonly used developer tools. A diff algorithm outputs the set of differences between two inputs. ![]()
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