Pattern 69 / CACHE
Use this when Preventing many identical requests from doing duplicate work.
Request Coalescing fits when Preventing many identical requests from doing duplicate work. Mechanism: Merge concurrent identical requests behind one in-flight operation. Use it for Cache misses, profile lookups, expensive aggregations. The toll: The coalescer becomes a hot path and must isolate failures.
Cache misses, profile lookups, expensive aggregations.
Use request coalescing when cache misses, profile lookups, expensive aggregations..
Describe the pressure first, then the mechanism, then the cost. That keeps the design grounded.
Same pressure family