Redis keyspace notifications

Mon, 01 Jan 0001 00:00:00 +0000

Keyspace notifications allow clients to subscribe to Pub/Sub channels in order to receive events affecting the Redis data set in some way.

Examples of events that can be received are:

All the commands affecting a given key.
All the keys receiving an LPUSH operation.
All the keys expiring in the database 0.

Note: Redis Pub/Sub is fire and forget; that is, if your Pub/Sub client disconnects, and reconnects later, all the events delivered during the time the client was disconnected are lost.

Redis subkey notifications

Mon, 01 Jan 0001 00:00:00 +0000

Subkey notifications, added in Redis 8.8, extend Redis's existing keyspace notification system to include the key, the subkey (for example, the field for hashes, the path for JSON documents, and the element for arrays), and the event type.

With standard keyspace notifications, when a hash field is modified via HSET, HDEL, or HEXPIRE, the subscriber receives the key name and the event type but not which specific fields were affected. Subkey notifications solve this by carrying the affected field names in the message payload.

Redis Pub/sub on Docs

Redis keyspace notifications

Redis subkey notifications