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https://issues.apache.org/jira/browse/FLINK-20145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17232587#comment-17232587
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Robert Metzger commented on FLINK-20145:
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Thanks a lot for addressing this so quickly!
I will verify the fix.
Another question: We have found this issue through manual testing only, and the
PR also doesn't contain any new tests. I wonder if we need additional test
coverage to verify this fix, and ensure that it won't be broken again in the
future.
> Streaming job fails with IllegalStateException: Should only poll priority
> events
> --------------------------------------------------------------------------------
>
> Key: FLINK-20145
> URL: https://issues.apache.org/jira/browse/FLINK-20145
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing, Runtime / Network
> Affects Versions: 1.12.0
> Reporter: Robert Metzger
> Assignee: Arvid Heise
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.12.0
>
>
> While testing the 1.12 release, I came across the following failure cause:
> {code}
> 2020-11-13 09:41:52,110 WARN org.apache.flink.runtime.taskmanager.Task
> [] - dynamic filter (3/4)#0 (b977944851531f96e5324e786f055eb7)
> switched from RUNNING to FAILED.
> java.lang.IllegalStateException: Should only poll priority events
> at
> org.apache.flink.util.Preconditions.checkState(Preconditions.java:198)
> ~[flink-dist_2.11-1.12.0.jar:1.12.0]
> at
> org.apache.flink.streaming.runtime.io.CheckpointedInputGate.processPriorityEvents(CheckpointedInputGate.java:116)
> ~[flink-dist_2.11-1.12.0.jar:1.12.0]
> at
> org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.runThrowing(StreamTaskActionExecutor.java:47)
> ~[flink-dist_2.11-1.12.0.jar:1.12.0]
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.Mail.run(Mail.java:78)
> ~[flink-dist_2.11-1.12.0.jar:1.12.0]
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:283)
> ~[flink-dist_2.11-1.12.0.jar:1.12.0]
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:184)
> ~[flink-dist_2.11-1.12.0.jar:1.12.0]
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:577)
> ~[flink-dist_2.11-1.12.0.jar:1.12.0]
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:541)
> ~[flink-dist_2.11-1.12.0.jar:1.12.0]
> at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:722)
> [flink-dist_2.11-1.12.0.jar:1.12.0]
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:547)
> [flink-dist_2.11-1.12.0.jar:1.12.0]
> at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]
> {code}
> I have unaligned checkpointing enabled, the failing operator is a
> CoFlatMapFunction. The error happend on all four TaskManagers, very soon
> after job submission. The error doesn't happen when unaligned checkpointing
> is disabled.
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