Fix broker return error code confuse when not set subscription name.

[shibd]

Motivation

When creating a consumer and not set a subscription name, users will receive a ResutlProducerBusy result, which is confusing.

2023-06-19 08:48:54.412 INFO  [0x7ff84d51c640] Client:90 | Subscribing on Topic :persistent://public/default/test-1
2023-06-19 08:48:54.416 INFO  [0x7ff84d51c640] ClientConnection:184 | [<none> -> pulsar+ssl://v2-10-o.chaos-platform.test.sn2.dev:6651] Create ClientConnection, timeout=10000
2023-06-19 08:48:59.379 INFO  [0x7ff84d51c640] ConnectionPool:106 | Created connection for pulsar+ssl://v2-10-o.chaos-platform.test.sn2.dev:6651
2023-06-19 08:48:59.381 INFO  [0x70000011e000] ClientConnection:382 | [198.18.0.1:52214 -> 198.18.2.113:6651] Connected to broker
2023-06-19 08:49:01.687 INFO  [0x70000011e000] HandlerBase:72 | [0x600001d1a628, , 0] Getting connection from pool
2023-06-19 08:49:01.937 INFO  [0x70000011e000] ClientConnection:184 | [<none> -> pulsar+ssl://v2-10-o.chaos-platform.test.sn2.dev:6651] Create ClientConnection, timeout=10000
2023-06-19 08:49:01.955 INFO  [0x70000011e000] ConnectionPool:106 | Created connection for pulsar://v2-10-o-broker-1.v2-10-o-broker-headless.chaos-platform.svc.cluster.local:6650
2023-06-19 08:49:01.956 INFO  [0x70000011e000] ClientConnection:384 | [198.18.0.1:52222 -> 198.18.2.113:6651] Connected to broker through proxy. Logical broker: pulsar://v2-10-o-broker-1.v2-10-o-broker-headless.chaos-platform.svc.cluster.local:6650
2023-06-19 08:49:03.534 WARN  [0x70000011e000] ClientConnection:1597 | [198.18.0.1:52222 -> 198.18.2.113:6651] Received error response from server: ProducerBusy (Empty subscription name) -- req_id: 0
2023-06-19 08:49:03.534 ERROR [0x70000011e000] ConsumerImpl:325 | [0x600001d1a628, , 0] Failed to create consumer: ProducerBusy
2023-06-19 08:49:03.534 ERROR [0x70000011e000] MultiTopicsConsumerImpl:138 | Failed when subscribed to topic persistent://public/default/test-1 in TopicsConsumer. Error - ProducerBusy
2023-06-19 08:49:03.534 ERROR [0x70000011e000] MultiTopicsConsumerImpl:149 | Unable to create Consumer - [Muti Topics Consumer: TopicName - 0x600001d2a748 - Subscription - ] Error - ProducerBusy
2023-06-19 08:49:03.535 WARN  [0x70000011e000] ConsumerImpl:1213 | [0x600001d1a628, , 0] Failed to close consumer: AlreadyClosed
2023-06-19 08:49:03.535 ERROR [0x70000011e000] MultiTopicsConsumerImpl:502 | Closing the consumer failed for partition - persistent://public/default/test-1-partition-0 with error - AlreadyClosed
2023-06-19 08:49:03.535 WARN  [0x70000011e000] MultiTopicsConsumerImpl:462 | [Muti Topics Consumer: TopicName - 0x600001d2a748 - Subscription - ]Failed to close consumer: AlreadyClosed
2023-06-19 08:49:03.535 ERROR [0x70000011e000] MultiTopicsConsumerImpl:299 | Unable to create Consumer - [Muti Topics Consumer: TopicName - 0x600001d2a748 - Subscription - ] Error - ProducerBusy
libc++abi: terminating due to uncaught exception of type std::runtime_error: Error creating consumer: 19

The root cause is broker returns the error code ProducerBusy on this scene.

https://github.com/apache/pulsar/blob/cd2aa550d0fe4e72b5ff88c4f6c1c2795b3ff2cd/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/BrokerServiceException.java#L240-L241

Modifications

• On the cpp client side, if receive a ProducerBusy error, trans it to ResultInvalidConfiguration.

Verifying this change

• Add testNotSetSubscriptionName unit test to cover it.

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[BewareMyPower]

Nice catch!