CODEWITHSUNDEEP
iosfirebasefirebase-cloud-messaging
iDevid
iDevid

Reputation: 517

Has Firebase FCM a subscribers limit? TOO_MANY_SUBSCRIBERS error

recently I started getting this type of error in production when registering to some topics:

Invalid registration response :'Error=TOO_MANY_SUBSCRIBERS'. It is missing 'token' field.

I'm using the following method on iOS Platform to register the device to a topic:

Messaging.messaging().subscribe(toTopic: String, completion: ((Error?) -> Void))

Environment:

  - FirebaseMessaging (7.0.0):
    - FirebaseCore (~> 7.0)
    - FirebaseInstanceID (~> 7.0)
    - GoogleUtilities/AppDelegateSwizzler (~> 7.0)
    - GoogleUtilities/Environment (~> 7.0)
    - GoogleUtilities/Reachability (~> 7.0)
    - GoogleUtilities/UserDefaults (~> 7.0)

The error suggests that firebase has a limit on the number of subscriptions to the topic, is this?

Upvotes: 0

Views: 2011

Answers (2)

Artur A
Artur A

Reputation: 9139

There is no limit on subscribers per topic, as well there is no limit on number of created topics per project.

There is a limit how fast client apps can be subscribed or unsubscribed from a topic - 3000 queries per second.

It looks like too many users are trying to subscribe to the topic, implement a retry logic.

Upvotes: 0

Fabio
Fabio

Reputation: 71

According to the Firebase docs, FCM has no total topic subscriptions limit, but a 2000 subscriptions per app instance limit.

Topic messaging supports unlimited subscriptions for each topic. However, FCM enforces limits in these areas:

  • One app instance can be subscribed to no more than 2000 topics.
  • If you are using batch import to subscribe app instances, each request is limited to 1000 app instances.
  • The frequency of new subscriptions is rate-limited per project. If you send too many subscription requests in a short period of time,
    FCM servers will respond with a 429 RESOURCE_EXHAUSTED ("quota
    exceeded") response. Retry with exponential backoff.

Upvotes: 4

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