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https://issues.apache.org/jira/browse/KAFKA-7729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16720114#comment-16720114
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Dimitris Mandalidis commented on KAFKA-7729:
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Thanks [~ijuma], do you know if there's an issue for this? (googling it shows
very old such bugs, and we 're using the latest 1.8 version)
> Mysterious disk increase when switching to RedHat OpenJDK
> ---------------------------------------------------------
>
> Key: KAFKA-7729
> URL: https://issues.apache.org/jira/browse/KAFKA-7729
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 1.1.0
> Reporter: Dimitris Mandalidis
> Priority: Minor
>
> (maybe it's not a bug actually, sort of a question)
> We run a Kafka cluster 1.1.0 with 3 brokers running in RHEL 7.5 having their
> logs over an LVM ext4 partition (fsck'd an hour ago). The cluster is using
> Oracle JDK 8u144 and it uses 45G of disk space under normal circumstances.
> We 've started switching to RedHat OpenJDK 1.8.0_191, one broker at a time.
> Since a broker had to be restarted, we thought that disk space increase was
> expected during rejoining the cluster, because it will first try to become
> ISR and it will roll segments (and delete if needed) afterwards (correct me
> if I 'm wrong). So the first OpenJDK broker ended up using 65G of disk space.
> For the second broker, because we will be running short of disk space, we
> decided to take him down and delete all the logs. So it also ended up using
> 65G of space.
> We let the two brokers to operate as such for 8 hours expecting that they
> will eventually stabilize in the previous 45G but they didn't. The current
> situation is that we have 2 OpenJDK brokers holding 65G of disk usage, and
> one Oracle JDK broker which still holds 45G and waits to be migrated.
> The actual question is that we cannot explain why we saw 20G disk space
> increase just switching to OpenJDK. We had performed rolling upgrades in the
> past (we 've started with 0.10) but we have never seen such a difference. Do
> you have any idea?
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