XREADGROUPRead stream entries as a consumer-group member, optionally blocking.
| Syntax | XREADGROUP GROUP group consumer [COUNT count] [BLOCK milliseconds] [NOACK] STREAMS key [key ...] id [id ...] |
| Group | stream |
| Arity | -7 |
| Since | 1.0.0 |
| Flags | write, blocking |
| Complexity | '>' form: O(log N + U + M) — COUNT does NOT bound the scan, the entire undelivered tail is materialised first. Replay form: O(log P + K) |
| Redis compatibility | differs: COUNT is parsed but does not bound the '>' scan |