Jordan Mcmillan created KAFKA-8926:
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Summary: Log Cleaner thread dies when
log.cleaner.min.cleanable.ratio is set to 0
Key: KAFKA-8926
URL: https://issues.apache.org/jira/browse/KAFKA-8926
Project: Kafka
Issue Type: Bug
Components: log cleaner
Affects Versions: 2.3.0
Reporter: Jordan Mcmillan
I applied a dynamic configuration change using the following command:
{code:bash}
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
{code}
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 starting the broker. I tried running:
{code:bash}
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
{code}
The log-cleaner log file showed the threads starting, but they never actually
starting cleaning topic partitions.
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