Fair Queues and Deletions That Stick

Two failures that look unrelated share a cause: a rule that is applied once and never revisited. A strict priority queue starves its lowest class, and a delete without a marker lets an old copy return through a replay. This course covers aging and reserved capacity for fair queues, and tombstones that refuse stale writes, expire on a schedule, and report every refusal so the source can be fixed.

Lessons(4)