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https://issues.apache.org/jira/browse/FLINK-30621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17656597#comment-17656597
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Matthias Pohl commented on FLINK-30621:
---------------------------------------
[~chesnay] may you have a look at this?
> Violation of main thread constraint detected
> --------------------------------------------
>
> Key: FLINK-30621
> URL: https://issues.apache.org/jira/browse/FLINK-30621
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Coordination
> Affects Versions: 1.17.0
> Reporter: Matthias Pohl
> Priority: Critical
>
> When looking into FLINK-30540, I noticed the following warning being logged
> not only in the context of {{DataSinkTaskTest}}:
> {code}
> 00:56:09,055 [ pool-263-thread-1] WARN
> org.apache.flink.runtime.rpc.MainThreadValidatorUtil [] - Violation
> of main thread constraint detected: expected <Thread[main,5,main]> but
> running in <Thread[pool-263-thread-1,5,main]>.
> java.lang.Exception: Violation of main thread constraint detected: expected
> <Thread[main,5,main]> but running in <Thread[pool-263-thread-1,5,main]>.
> at
> org.apache.flink.runtime.rpc.MainThreadValidatorUtil.isRunningInExpectedThread(MainThreadValidatorUtil.java:73)
> ~[flink-rpc-core-1.17-SNAPSHOT.jar:1.17-SNAPSHOT]
> at
> org.apache.flink.runtime.concurrent.ComponentMainThreadExecutorServiceAdapter.lambda$new$0(ComponentMainThreadExecutorServiceAdapter.java:56)
> ~[test-classes/:1.17-SNAPSHOT]
> at
> org.apache.flink.runtime.concurrent.ComponentMainThreadExecutorServiceAdapter.assertRunningInMainThread(ComponentMainThreadExecutorServiceAdapter.java:86)
> ~[test-classes/:1.17-SNAPSHOT]
> at
> org.apache.flink.runtime.jobmaster.slotpool.DeclarativeSlotPoolBridge.assertRunningInMainThread(DeclarativeSlotPoolBridge.java:446)
> ~[classes/:?]
> at
> org.apache.flink.runtime.jobmaster.slotpool.DeclarativeSlotPoolBridge.checkBatchSlotTimeout(DeclarativeSlotPoolBridge.java:464)
> ~[classes/:?]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> [?:1.8.0_292]
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> [?:1.8.0_292]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
> [?:1.8.0_292]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> [?:1.8.0_292]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> [?:1.8.0_292]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> [?:1.8.0_292]
> at java.lang.Thread.run(Thread.java:748) [?:1.8.0_292]
> {code}
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