[KAFKA-8926] Log Cleaner thread dies when log.cleaner.min.cleanable.ratio is set to 0

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.3.0
• Component/s: log cleaner
• Assignee: Unassigned
• Reporter: Jordan Mcmillan
• Created: 19/Sep/19 20:34
• Updated: 04/Apr/21 13:39

Description

I applied a dynamic configuration change using the following command:

kafka-configs --bootstrap-server `hostname`:9093 --command-config /etc/kafka/consumer.properties --entity-type brokers --entity-name 1 --alter --add-config log.cleaner.min.cleanable.ratio=0.00

I applied the change to each node in a 6 node cluster. This caused the log cleaner thread to die on each node. I reverted the config and restarted the broker to restore functionality.

Also interesting (although a bit of a digression) is that I was not able to restart the log cleaning thread without restarting the broker. I tried running:

kafka-configs --bootstrap-server `hostname`:9093 --command-config /etc/kafka/consumer.properties --entity-type brokers --entity-name 1 --alter --add-config log.cleaner.threads=3

The log-cleaner log file showed the threads starting, but they never actually starting cleaning topic partitions.

Issue Links

• is related to: KAFKA-12613 Inconsistencies between Kafka Config and Log Config