Tag: Jitter

All the articles with the tag "Jitter".

• JPA Optimistic Lock and the Retry Stampede Trap — 6 Scenarios @Version Cannot Cover Alone

  4 May, 2026

  100 workers each increment the same rule's priority by +1. Without @Version, the final priority < 100 (Lost Update). With @Version, you only get OptimisticLockException — handling is the caller's responsibility, so only some succeed. @Retryable(3) with backoff=0 produces **retry stampede** — retries pile up at the same instant, colliding again. Exponential backoff with full jitter spreads retries out and reaches priority=100. Plus the **self Lost Update** trap discovered along the way — same transaction, two SELECTs returning different objects (JDBC) vs the same instance (JPA first-level cache `==`). Different category from distributed Lost Update. The piece also covers @Transactional + @Retryable AOP ordering and the AWS Architecture Blog rationale for full jitter.