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#akka

2 posts filed under this tag.

Distributed Systems01

Actor-per-Entity vs Postgres Optimistic Locking: A Seat-Reservation Bake-off

I ran the same hot-key seat reservation workload two ways: Postgres with a version column and retries, and a single actor per seat. The actor design did not scale better — it moved the hard problem from concurrency control to routing and rebalance correctness, and that trade was the easier one to reason about under hot keys.

May 26
Distributed Systems02

Auditing a Scala Service Against Chad Fowler's Four Regenerative Constraints

I walked a Scala order-processing service from my notes through Chad Fowler's four regenerative constraints. Two passed for free, two would force a real redesign. Here is what I learned about where "loosely coupled module" ends and "regenerative component" begins, and which parts of the redesign I would actually pay for.

May 23