Experience with Rules-Based Programming for Distributed Concurrent Fault-Tolerant Code
blog.acolyer.org/2016/01/19/dcft
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Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
To demonstrate applicability outside of the RAMCloud system, the team also re-wrote the Hadoop Map-Reduce job scheduler (which uses a traditional event-based state machine approach) using rules. The original code has three state machines containing 34 states with 163 different transitions, about 2,250 lines of code in total. The rules-based re-implementation required 19 rules in 3 tasks with a total of 117 lines of code and comments.
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