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Debugging a memory leak in a Clojure service
Background Fraud Rules Service (FRS) is a rule engine in Goto Financial’s sanctions platform (my team). FRS lets you write dynamic rules to fight against fraud.
Approximately two months ago, we started seeing issues with the service where the pod’s current memory would keep increasing and exceed the request set up on Kubernetes. I’ll be skipping the things that were attempted as I want to focus on the problem caused by a Clojure core(std) library function. And drum roll, the memory usage dropped by a lot and we started planning to reduce the resources for the service.
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