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https://issues.apache.org/jira/browse/KAFKA-6828?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismael Juma resolved KAFKA-6828.
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Resolution: Fixed
Great! Let's close this then.
> Index files are no longer sparse in Java 9/10 due to OpenJDK regression
> -----------------------------------------------------------------------
>
> Key: KAFKA-6828
> URL: https://issues.apache.org/jira/browse/KAFKA-6828
> Project: Kafka
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.0.0
> Environment: CentosOS 7 on EXT4 FS
> Reporter: Enrico Olivelli
> Priority: Critical
>
> This is a very strage case. I have a Kafka broker (part of a cluster of 3
> brokers) which cannot start upgrading Java from Oracle JDK8 to Oracle JDK
> 9.0.4 (the same with JDK 10.0.0)
> There are a lot of .index and .timeindex files taking 10MB, they are for
> empty partiions.
> Running with Java 9 the server seems to rebuild these files and each file
> takes "really" 10MB.The sum of all the files (calculated using du -sh) is
> 22GB and the broker crashes during startup, disk becomes full and no log more
> is written. (I can send an extraction of the logs, but the tell only about
> 'rebuilding index', the same as on Java 8)
> Reverting the same broker to Java 8 and removing the index files, the broker
> rebuilds such files, each files take 10MB, but the full sum of sizes
> (calculated using du -sh) is 38 MB !
> I am running this broker on CentosOS 7 on EXT4 FS.
> I have upgraded the broker to latest and greatest Kafka 1.0.0 (from 0.10.2)
> without any success.
>
> After checking on JDK nio-dev list it appears a regresion in the behaviour
> of RandomAccessFile
> Just for reference see this discussion on nio-dev list on OpenJDK
> [http://mail.openjdk.java.net/pipermail/nio-dev/2018-April/005008.html]
> see
> [https://bugs.openjdk.java.net/browse/JDK-8168628]
>
>
>
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