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Read Repair Read Amplification in Quorum-Based Stores : Cold-Path Replay and Backfill Correctness
RustTokioSledPrometheus
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. Quorum reads with read-repair fetch from all replicas to reconcile divergence; when replication lag is high, every read becomes a full fan-out to…
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