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Backpressure Collapse in Reactive Stream Fan-Out Topologies : Cold-Path Replay and Backfill Correctness
KotlinApache PulsargRPCMicrometer
Problem Breakdown
The vulnerable surface is the cold path: replay, backfill, and migration jobs that process historical data at scale, which every production system runs but almost none tests. A fast publisher fans out into N slow subscribers through unbounded or naively-bounded queues; the slowest subscriber's consumption rate silently…
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