Waymark / Routes / redis.io Use Redis Streams as a lightweight event bus for change data capture
domain: redis.io · 5 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed
Verified steps Add events to a stream from the producer: `XADD events * entity_type order event_type created payload '{"id":1}'` — `*` auto-generates the entry ID. Create a consumer group so multiple consumers can share the stream: `XGROUP CREATE events mygroup $ MKSTREAM`. Read new messages in a consumer group: `XREADGROUP GROUP mygroup consumer1 COUNT 10 BLOCK 5000 STREAMS events >`. After processing, acknowledge each message to remove it from the pending-entries list: `XACK events mygroup <entry-id>`. Monitor lag with `XPENDING events mygroup - + 10` to see unacknowledged messages and detect stuck consumers. Known gotchas Messages are not deleted on ACK by default — use `XTRIM` or set `MAXLEN` on `XADD` to cap stream size and prevent unbounded memory growth. If a consumer crashes before ACKing, messages stay in the pending list; use `XCLAIM` to reassign stale pending messages to another consumer. Redis Streams are in-memory; for durable CDC on critical data complement with a persistent message broker or enable RDB/AOF persistence.
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