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From "Peter Davis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-3894) Log Cleaner thread crashes and never restarts
Date Sat, 02 Jul 2016 08:12:11 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-3894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15360062#comment-15360062

Peter Davis commented on KAFKA-3894:

A quick improvement would be to increase the severity of the log message when log cleaner
stops. Right now there is just an "INFO" message that's easy to miss.

> Log Cleaner thread crashes and never restarts
> ---------------------------------------------
>                 Key: KAFKA-3894
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3894
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions:,
>         Environment: Oracle JDK 8
> Ubuntu Precise
>            Reporter: Tim Carey-Smith
>              Labels: compaction
> The log-cleaner thread can crash if the number of keys in a topic grows to be too large
to fit into the dedupe buffer. 
> The result of this is a log line: 
> {quote}
> broker=0 pri=ERROR t=kafka-log-cleaner-thread-0 at=LogCleaner \[kafka-log-cleaner-thread-0\],
Error due to  java.lang.IllegalArgumentException: requirement failed: 9750860 messages in
segment MY_FAVORITE_TOPIC-2/00000000000047580165.log but offset map can fit only 5033164.
You can increase log.cleaner.dedupe.buffer.size or decrease log.cleaner.threads
> {quote}
> As a result, the broker is left in a potentially dangerous situation where cleaning of
compacted topics is not running. 
> It is unclear if the broader strategy for the {{LogCleaner}} is the reason for this upper
bound, or if this is a value which must be tuned for each specific use-case. 
> Of more immediate concern is the fact that the thread crash is not visible via JMX or
exposed as some form of service degradation. 
> Some short-term remediations we have made are:
> * increasing the size of the dedupe buffer
> * monitoring the log-cleaner threads inside the JVM

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