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From "Jordan Mcmillan (Jira)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-8926) Log Cleaner thread dies when log.cleaner.min.cleanable.ratio is set to 0
Date Thu, 19 Sep 2019 20:35:00 GMT
Jordan Mcmillan created KAFKA-8926:
--------------------------------------

             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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