[jira] [Created] (KAFKA-13996) log.cleaner.io.max.bytes.per.second cannot be changed dynamically

["Tomonari Yamashita (Jira)" <ji...@apache.org>]

Tomonari Yamashita created KAFKA-13996:
------------------------------------------

             Summary: log.cleaner.io.max.bytes.per.second cannot be changed dynamically 
                 Key: KAFKA-13996
                 URL: https://issues.apache.org/jira/browse/KAFKA-13996
             Project: Kafka
          Issue Type: Bug
          Components: config, core, log cleaner
    Affects Versions: 3.2.0
            Reporter: Tomonari Yamashita
            Assignee: Tomonari Yamashita


- log.cleaner.io.max.bytes.per.second cannot be changed dynamically using bin/kafka-configs.sh
- Reproduction procedure:
-# Create a topic with cleanup.policy=compact
{code:java}
bin/kafka-topics.sh --bootstrap-server localhost:9092 --create --replication-factor 1 --partitions 1 --topic my-topic --config cleanup.policy=compact --config cleanup.policy=compact --config segment.bytes=104857600 --config compression.type=producer
{code}
-# Change log.cleaner.io.max.bytes.per.second=10485760 using bin/kafka-configs.sh
{code:java}
bin/kafka-configs.sh --bootstrap-server localhost:9092 --entity-type brokers --entity-default --alter --add-config log.cleaner.io.max.bytes.per.second=10485760
{code}
-# Send enough messages(> segment.bytes=104857600) to activate Log Cleaner
-# logs/log-cleaner.log, configuration by log.cleaner.io.max.bytes.per.second=10485760 is not reflected and Log Cleaner does not slow down (>= log.cleaner.io.max.bytes.per.second=10485760).
{code:java}
[2022-06-15 14:52:14,988] INFO [kafka-log-cleaner-thread-0]:
        Log cleaner thread 0 cleaned log my-topic-0 (dirty section = [39786, 81666])
        3,999.0 MB of log processed in 2.7 seconds (1,494.4 MB/sec).
        Indexed 3,998.9 MB in 0.9 seconds (4,218.2 Mb/sec, 35.4% of total time)
        Buffer utilization: 0.0%
        Cleaned 3,999.0 MB in 1.7 seconds (2,314.2 Mb/sec, 64.6% of total time)
        Start size: 3,999.0 MB (41,881 messages)
        End size: 0.1 MB (1 messages)
        100.0% size reduction (100.0% fewer messages)
 (kafka.log.LogCleaner)
{code}
- Problem cause:
-- log.cleaner.io.max.bytes.per.second is used in Throttler in LogCleaner, however, it is only passed to Throttler at initialization time.
--- https://github.com/apache/kafka/blob/4380eae7ceb840dd93fee8ec90cd89a72bad7a3f/core/src/main/scala/kafka/log/LogCleaner.scala#L107-L112
-- Need to change Throttler configuration value at reconfigure() of LogCleaner.
 --- https://github.com/apache/kafka/blob/4380eae7ceb840dd93fee8ec90cd89a72bad7a3f/core/src/main/scala/kafka/log/LogCleaner.scala#L192-L196
- A workaround is that restarting every broker adding log.cleaner.io.max.bytes.per.second to config/server.properties



--
This message was sent by Atlassian Jira
(v8.20.7#820007)