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PUBLISH

Last updated 
PUBLISH channel message
Group
Pub/Sub
Complexity
O(N+M) where N is the channel's subscribers and M the subscribed patterns
Arity
3 (exactly, counting the command name)
Flags
pubsub, fast
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PUBLISH delivers message to every connection subscribed to channel, and to every connection whose pattern subscriptions match it. Delivery is fire-and-forget: nothing is stored, and a subscriber that is not connected misses the message. In a cluster, the message is forwarded to the other nodes so their subscribers receive it as well.

When PUBLISH runs inside a transaction or a script, its message is delivered in order with the keyspace notifications of the commands before it.

Return value

Section titled “Return value”
Case RESP2 RESP3
Always Integer: the number of subscribers on this node that received the message Integer

In a cluster the count covers only the node that ran PUBLISH.

Examples

Section titled “Examples”
127.0.0.1:6379> PUBLISH news "release 2.0 is out"
(integer) 2
127.0.0.1:6379> PUBLISH nobody-listens "hello"
(integer) 0

Compatibility

Section titled “Compatibility”

Same as Redis 7 and Valkey 8.

See also

Section titled “See also”

SUBSCRIBE, PSUBSCRIBE, SPUBLISH, PUBSUB NUMSUB