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https://issues.apache.org/jira/browse/KAFKA-19696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18020580#comment-18020580
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LiuJing commented on KAFKA-19696:
---------------------------------
Hi, thank you for the guidance!
I understand this issue is non-trivial and involves concurrency changes.
Rather than immediately claiming the task, I would like to first analyze the
problem and propose a potential improvement approach.
Once I have a clear plan, I can discuss it with the maintainers before
proceeding with the actual fix or being assigned the task.
Looking forward to your feedback, thanks!
> Re-enable SmokeTestDriverIntegrationTest for processing threads
> ---------------------------------------------------------------
>
> Key: KAFKA-19696
> URL: https://issues.apache.org/jira/browse/KAFKA-19696
> Project: Kafka
> Issue Type: Task
> Components: streams
> Reporter: Lucas Brutschy
> Priority: Major
>
> The test fails occasionally with a race condition like this:
> {code:java}
> 2_0 RUNNING StreamTask(active):
> org.apache.kafka.streams.errors.StreamsException:
> java.util.ConcurrentModificationExceptionorg.apache.kafka.streams.errors.StreamsException:
> java.util.ConcurrentModificationException at
> org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:977)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:894)Caused
> by: java.util.ConcurrentModificationException at
> java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1597) at
> java.base/java.util.HashMap$KeyIterator.next(HashMap.java:1620) at
> org.apache.kafka.clients.consumer.internals.ClassicKafkaConsumer.resume(ClassicKafkaConsumer.java:979)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.resume(KafkaConsumer.java:1509)
> at
> org.apache.kafka.streams.processor.internals.StreamTask.resumePollingForPartitionsWithAvailableSpace(StreamTask.java:623)
> at
> org.apache.kafka.streams.processor.internals.TaskManager.resumePollingForPartitionsWithAvailableSpace(TaskManager.java:1866)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.runOnceWithProcessingThreads(StreamThread.java:1355)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:932)
> {code}
> h4. *Since the feature is not actively developed by anybody, we disable this
> test. This ticket is to re-enable the test when the race condition is fixed.*
>
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