Abacn opened a new issue, #39179:
URL: https://github.com/apache/beam/issues/39179
### What needs to happen?
MqttIO uses org.fusesource.mqtt-client:mqtt-client. There is a known bug in
its BlockingConnection, such that a StackOverflowError raised when there is no
incoming message in extended period of time, as it registers a callback on
every poll ended with timeout:
```
// In package org.fusesource.mqtt.client.BlockingConnection
public Message receive(long amount, TimeUnit unit) throws Exception {
Future<Message> receive = this.next.receive();
try {
Message message = receive.await(amount, unit);
if( message!=null ) {
message.blocking = true;
}
return message;
} catch (TimeoutException e) {
// Put it back on the queue..
receive.then(new Callback<Message>() {
public void onSuccess(final Message value) {
next.putBackMessage(value);
}
public void onFailure(Throwable value) {
}
});
return null;
}
}
```
However, fusesource Mqtt client has long been unmaintained. To move forward,
we'd need to migrate mqttio client to a supported solution. One choice is
ActiveMQ's mqtt client, which is actively maintained, and activemq is already a
test dependency for mqttio (broker)
### Issue Priority
Priority: 2 (default / most normal work should be filed as P2)
### Issue Components
- [ ] Component: Python SDK
- [x] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [x] Component: IO connector
- [ ] Component: Beam YAML
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Infrastructure
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Prism Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner
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