[jira] [Created] (KAFKA-14208) KafkaConsumer#commitAsync throws unexpected WakeupException

["Qingsheng Ren (Jira)" <ji...@apache.org>]

Qingsheng Ren created KAFKA-14208:
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             Summary: KafkaConsumer#commitAsync throws unexpected WakeupException
                 Key: KAFKA-14208
                 URL: https://issues.apache.org/jira/browse/KAFKA-14208
             Project: Kafka
          Issue Type: Bug
          Components: clients
    Affects Versions: 3.2.1
            Reporter: Qingsheng Ren


We recently encountered a bug after upgrading Kafka client to 3.2.1 in Flink Kafka connector (FLINK-29153). Here's the exception:
{code:java}
org.apache.kafka.common.errors.WakeupException
	at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.maybeTriggerWakeup(ConsumerNetworkClient.java:514)
	at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:278)
	at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:236)
	at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:215)
	at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureCoordinatorReady(AbstractCoordinator.java:252)
	at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.coordinatorUnknownAndUnready(ConsumerCoordinator.java:493)
	at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.commitOffsetsAsync(ConsumerCoordinator.java:1055)
	at org.apache.kafka.clients.consumer.KafkaConsumer.commitAsync(KafkaConsumer.java:1573)
	at org.apache.flink.streaming.connectors.kafka.internals.KafkaConsumerThread.run(KafkaConsumerThread.java:226) {code}
As {{WakeupException}} is not listed in the JavaDoc of {{{}KafkaConsumer#commitAsync{}}}, Flink Kafka connector doesn't catch the exception thrown directly from KafkaConsumer#commitAsync but handles all exceptions in the callback.

I checked the source code and suspect this is caused by KAFKA-13563. Also we never had this exception in commitAsync when we used Kafka client 2.4.1 & 2.8.1. 

I'm wondering if this is kind of breaking the public API as the WakeupException is not listed in JavaDoc, and maybe it's better to invoke the callback to handle the {{WakeupException}} instead of throwing it directly from the method itself. 



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