[jira] [Updated] (KAFKA-9540) Application getting "Could not find the standby task 0_4 while closing it" error

["Matthias J. Sax (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-9540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias J. Sax updated KAFKA-9540:
-----------------------------------
    Fix Version/s: 2.5.1

> 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
>    Affects Versions: 2.4.0, 2.5.0
>            Reporter: Badai Aqrandista
>            Priority: Minor
>             Fix For: 2.4.1, 2.6.0, 2.5.1
>
>
> 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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