Badai Aqrandista created KAFKA-9540: ---------------------------------------
Summary: 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 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. -- This message was sent by Atlassian Jira (v8.3.4#803005)