ML Feature Serving Platform

Running analytical queries against the same PostgreSQL instance that serves OLTP traffic causes query plan interference, buffer cache thrashing, and lock contention. Analytical queries scan large row ranges; OLTP queries require point lookups. These access patterns are fundamentally incompatible at scale and must be separated before the interference causes P99 degradation.

Synchronous call chains that span more than 2-3 service boundaries create cascading latency exposure. When any downstream component degrades, the entire synchronous chain stalls. This is one of the most common contributors to unexpected P99 latency spikes and cascading failure in distributed systems.

Partition key designs that concentrate traffic on a small number of partitions negate the horizontal scaling benefits of sharding or partitioned systems. A hot partition creates a throughput ceiling that cannot be solved by adding more nodes: the bottleneck is the key distribution, not the node count.

Message queues or event streams that grow unboundedly under producer-consumer imbalance create memory pressure, increased recovery time, and operational ambiguity about whether the consumer is alive and processing. Backlog management must be designed in advance: retroactively adding it is operationally painful.

Caching layers without explicit invalidation strategies introduce silent data staleness. The risk compounds when cache TTLs are long, write rates are high, or cache warm-up after a flush causes simultaneous database load spikes (cache stampede). Cache invalidation is consistently one of the hardest operational problems in distributed caching architectures.

Distributed architectures without instrumentation across all integration boundaries create blind spots during incidents. Each un-instrumented boundary adds mean time to diagnosis. Observability is not a post-launch concern : the integration points that are hardest to instrument are the same ones most likely to fail and hardest to debug.

ML Feature Serving Platform exhibits signals of the Cache Stampede Architecture anti-pattern. Detected via: 'redis', 'cache', 'stampede'. Cache layer is added as a performance optimization without modeling failure modes. The happy path (w