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https://issues.apache.org/jira/browse/FLINK-20157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17231599#comment-17231599
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Robert Metzger commented on FLINK-20157:
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[~becket_qin] Can you take a look?
> SourceCoordinatorProvider kills JobManager with IllegalStateException on job
> submission
> ---------------------------------------------------------------------------------------
>
> Key: FLINK-20157
> URL: https://issues.apache.org/jira/browse/FLINK-20157
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Affects Versions: 1.12.0
> Reporter: Robert Metzger
> Priority: Blocker
> Fix For: 1.12.0
>
>
> While setting up a test job using the new Kafka source for testing the RC1 of
> Flink 1.12, my JobManager died with a fatal exception:
> {code}
> 2020-11-13 17:05:53,947 INFO
> org.apache.flink.runtime.executiongraph.ExecutionGraph [] - Deploying
> Flat Map -> Sink: Print to Std. Out (1/1) (attempt #0) with attempt id
> fc36327d85e775204e82fc8507bf4264 to 192.168.1.25:57387-78ca68 @
> robertsbabamac2.localdomain (dataPort=57390) with allocation id
> a8d918c0cfb57305908ce5a4f4787034
> 2020-11-13 17:05:53,988 ERROR
> org.apache.flink.runtime.util.FatalExitExceptionHandler [] - FATAL:
> Thread 'SourceCoordinator-Source: Kafka Source' produced an uncaught
> exception. Stopping the process...
> java.lang.IllegalStateException: Should never happen. This factory should
> only be used by a SingleThreadExecutor.
> at
> org.apache.flink.runtime.source.coordinator.SourceCoordinatorProvider$CoordinatorExecutorThreadFactory.newThread(SourceCoordinatorProvider.java:94)
> ~[flink-dist_2.11-1.12.0.jar:1.12.0]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.<init>(ThreadPoolExecutor.java:619)
> ~[?:1.8.0_222]
> at
> java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:932)
> ~[?:1.8.0_222]
> at
> java.util.concurrent.ThreadPoolExecutor.processWorkerExit(ThreadPoolExecutor.java:1025)
> ~[?:1.8.0_222]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
> ~[?:1.8.0_222]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> ~[?:1.8.0_222]
> at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]
> {code}
> I'm using the KafkaSource as documented, with a single partition topic:
> {code:java}
> KafkaSource<Event> source = KafkaSource
> .<Event>builder()
> .setBootstrapServers(brokers)
> .setGroupId("myGroup")
> .setTopics(Arrays.asList(kafkaTopic))
> .setDeserializer(new NewEventDeserializer())
> .build();
> {code}
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