CODEWITHSUNDEEP
redis
RamPrakash
RamPrakash

Reputation: 3322

Redis - Max channels/topics for pub/sub

I am trying to create chat rooms app and use redis pub/sub broadcasting messages across subscribers. Each meeting room is 1 channel. The problem is I can have infinite number of channels over time.

Upvotes: 0

Views: 2447

Answers (1)

for_stack
for_stack

Reputation: 23041

Is there any limit for max number of channels I can have in redis?

Redis doesn't set any limit on the number of channels. Channels are saved into a hash, whose size is of type long. So in theory, the limit is 2**63 on a 64 bits machine. However, since your memory is limited, you cannot reach the limit. In a word, practically, there's no limit.

Is there any way to auto expire/delete channels which have not received any messages for publishing?

There's no way to do that. Redis deletes a channel, only when all clients of the channel have unsubscribed it, i.e. when a channel has no subscribers, Redis remove the channel automatically. If there's at least one client subscribing it, Redis keep the channel even if there's no message published to it.

Upvotes: 3

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