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https://issues.apache.org/jira/browse/FLINK-31395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17698939#comment-17698939
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Matthias Pohl commented on FLINK-31395:
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# Is it a test-code-only issue or does it reveal a problem in production?
# Is this something that was newly introduced due to some backports and,
therefore, might affect the 1.17 release?
> AbstractPartitionDiscoverer.discoverPartitions calls remove on immutable
> collection
> -----------------------------------------------------------------------------------
>
> Key: FLINK-31395
> URL: https://issues.apache.org/jira/browse/FLINK-31395
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Affects Versions: 1.16.1
> Reporter: Matthias Pohl
> Priority: Critical
> Labels: test-stability
>
> https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=47009&view=logs&j=aa18c3f6-13b8-5f58-86bb-c1cffb239496&t=502fb6c0-30a2-5e49-c5c2-a00fa3acb203&l=8459
> {{FlinkKafkaConsumerBaseTest.testClosePartitionDiscovererWithCancellation}}
> failed because of that.
> {code}
> [...]
> Mar 10 01:48:27 Caused by: java.lang.RuntimeException:
> java.lang.UnsupportedOperationException
> Mar 10 01:48:27 at
> org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.runWithPartitionDiscovery(FlinkKafkaConsumerBase.java:846)
> Mar 10 01:48:27 at
> org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.run(FlinkKafkaConsumerBase.java:828)
> Mar 10 01:48:27 at
> org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBaseTest.lambda$testNormalConsumerLifecycle$9(FlinkKafkaConsumerBaseTest.java:695)
> Mar 10 01:48:27 at
> org.apache.flink.util.function.ThrowingRunnable.lambda$unchecked$0(ThrowingRunnable.java:49)
> Mar 10 01:48:27 at
> java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640)
> Mar 10 01:48:27 at
> java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1632)
> Mar 10 01:48:27 at
> java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
> Mar 10 01:48:27 at
> java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
> Mar 10 01:48:27 at
> java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
> Mar 10 01:48:27 at
> java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175)
> Mar 10 01:48:27 Caused by: java.lang.UnsupportedOperationException
> Mar 10 01:48:27 at java.util.Collections$1.remove(Collections.java:4686)
> Mar 10 01:48:27 at
> org.apache.flink.streaming.connectors.kafka.internals.AbstractPartitionDiscoverer.discoverPartitions(AbstractPartitionDiscoverer.java:165)
> Mar 10 01:48:27 at
> org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.lambda$createAndStartDiscoveryLoop$2(FlinkKafkaConsumerBase.java:880)
> Mar 10 01:48:27 at java.lang.Thread.run(Thread.java:748)
> {code}
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