[GitHub] [pulsar] BewareMyPower commented on issue #5662: [doc] API documentation doesn't describe behaviour of async callbacks

[GitBox <gi...@apache.org>]

BewareMyPower commented on issue #5662:
URL: https://github.com/apache/pulsar/issues/5662#issuecomment-1338994355

   @tisonkun The behavior is expected. The behavior is similar in Java client. The callback is executed by the internal executor of the pulsar-client library. The thread is different from the main thread.
   
   ```java
           @Cleanup final var client = PulsarClient.builder().serviceUrl(Config.BROKER_URL).build();
           System.out.println(Thread.currentThread().getName());
           client.newProducer(Schema.STRING)
                   .topic("my-topic")
                   .create()
                   .sendAsync("hello")
                   .thenAccept(id -> System.out.println(Thread.currentThread().getName() + " " + id))
                   .get();
   ```
   
   Outputs:
   
   ```
   main
   pulsar-client-io-1-1 16:0:-1:0
   ```
   
   > I cannot see it documented anywhere whether the callbacks occur in a different thread
   
   I'm not sure if it's worth documenting. Should we assume the callback is executed in the caller's thread without any explicit explanation?


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