关于Firebase：一个应用实例可以在FCM中订阅多少个主题？


How many topics an app instance can subscribe in FCM?

如FCM文档所述，可以为一个Firebase应用程序创建无限的主题。但是作为Firebase Admin SDK文档：解释错误：

messaging/too-many-topics:- A registration token has been subscribed to the maximum number of topics and cannot be subscribed to any more.

我找不到最大主题数的阈值。谁能解释，极限是多少？一个应用实例可以在FCM中订阅多少个主题？

相关讨论

我通过运行应用程序实例的订阅脚本找到了答案。订阅1999年的主题后，对于下一个订阅，它开始出现错误：messaginging / too-many-topics。

因此阈值为1999.

只要选择的答案是正确的，我就在这里发布一个绝对的答案。
Google Firebase云消息传递

Some things to keep in mind about topics:

  • 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.