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https://issues.apache.org/jira/browse/KAFKA-9540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17034918#comment-17034918
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ASF GitHub Bot commented on KAFKA-9540:
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guozhangwang commented on pull request #8092: KAFKA-9540: Move "Could not find
the standby task while closing it" log to debug level
URL: https://github.com/apache/kafka/pull/8092
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> Application getting "Could not find the standby task 0_4 while closing it"
> error
> --------------------------------------------------------------------------------
>
> Key: KAFKA-9540
> URL: https://issues.apache.org/jira/browse/KAFKA-9540
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Badai Aqrandista
> Priority: Minor
>
> Because of this the following line, there is a possibility that some standby
> tasks might not be created:
> https://github.com/apache/kafka/blob/2.4.0/streams/src/main/java/org/apache/kafka/streams/processor/internals/StreamThread.java#L436
> Then causing this line to not adding the task to standby task list:
> https://github.com/apache/kafka/blob/2.4.0/streams/src/main/java/org/apache/kafka/streams/processor/internals/StreamThread.java#L299
> But this line assumes that all standby tasks are to be created and add it to
> the standby list:
> https://github.com/apache/kafka/blob/2.4.0/streams/src/main/java/org/apache/kafka/streams/processor/internals/TaskManager.java#L168
> This results in user getting this error message on the next
> PARTITION_ASSIGNMENT state:
> {noformat}
> Could not find the standby task 0_4 while closing it
> (org.apache.kafka.streams.processor.internals.AssignedStandbyTasks:74)
> {noformat}
> But the harm caused by this issue is minimal: No standby task for some
> partitions. And it is recreated on the next rebalance anyway. So, I suggest
> lowering this message to WARN. Or probably check to WARN when standby task
> could not be created.
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