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Goal: select a read consistency level for a three-node Cassandra 4.x cluster with replication factor 3 that serves user-profile reads. The application must avoid stale reads, but the p99 latency budget is tight. Local single-node testing with consistency ONE hides replication lag because the only replica satisfies the read requirement. In production, ONE can
In Apache Cassandra, read repair is documented to trigger when replicas return inconsistent data during a read, but the interaction between this repair path and the row cache or key cache can leave stale entries visible to clients. The precise question is under what conditions a cache invalidation is guaranteed to propagate to all replicas after a read repai
cassandra