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PUBSUB SHARDNUMSUB

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PUBSUB SHARDNUMSUB [shardchannel [shardchannel ...]]
Group
Pub/Sub
Complexity
O(N) for N shard channels
Arity
-2 (at least 2 words, counting the command name)
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PUBSUB SHARDNUMSUB returns, for each shard channel you name, how many connections on this node subscribe to it with SSUBSCRIBE. Without channels it returns an empty array.

Case RESP2 RESP3
Always Flat array of shard channel, count pairs, in the order given Same flat array
127.0.0.1:6379> PUBSUB SHARDNUMSUB orders:{eu} orders:{us}
1) "orders:{eu}"
2) (integer) 1
3) "orders:{us}"
4) (integer) 0

Same as Redis 7 and Valkey 8.

PUBSUB SHARDCHANNELS, PUBSUB NUMSUB, SPUBLISH