Fan out Redis Stream messages to all consumers with XREAD
domain: redis.io · 7 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
For broadcast (every consumer receives every new message) use XREAD, not consumer groups: `XREAD COUNT 10 BLOCK 5000 STREAMS mystream $`.
`$` means 'only messages added after this call' - use it for the FIRST call only.
On subsequent calls pass the ID of the last message you received as the continuation point: `XREAD COUNT 10 BLOCK 5000 STREAMS mystream 1526999352406-0`.
Read from multiple streams in one call: `XREAD COUNT 2 STREAMS streamA streamB 0-0 0-0`.
BLOCK is in MILLISECONDS (unlike most Redis blocking commands which use seconds). Returns (nil) on timeout.
Track 'last entry' cheaply with `+` (Redis 7.4+): `XREAD STREAMS mystream +` returns the most recent entry; note COUNT is ignored for that stream.
For large multi-stream reads bound total work: `XREAD MAXCOUNT n` or `MAXSIZE bytes` (Redis 8.10+).
Known gotchas
The critical `$` trap: use it only for the first read, then continue from the last returned ID, or you will miss entries added in between.
XREAD fans out - every waiting consumer gets a copy, unlike blocking list pop operations.
STREAMS must be the FINAL option and is mandatory.
Incomplete IDs are treated as sequence 0 (e.g. `0` == `0-0`).
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