streams

Redis Systems · 8 min read · 2025-09-20

Redis 8.6 Streams Finally Address the Producer Retry Ambiguity Directly

A producer can time out after XADD without knowing whether Redis accepted the entry. Redis 8.6 adds stream idempotency so retries can be recognized without creating duplicate entries.

Redis Systems · 8 min read · 2025-05-10

The Redis Streams Pending Entries List Is Your Work-in-Progress Ledger

Consumer groups do not make a stream entry disappear when it is delivered. Until XACK succeeds, Redis tracks it as pending, which is what makes crashed-consumer recovery possible.

redis streams consumer-groups pel