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https://issues.apache.org/jira/browse/KAFKA-5582?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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huxihx resolved KAFKA-5582.
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Resolution: Duplicate
> Log compaction with preallocation enabled does not trim segments
> ----------------------------------------------------------------
>
> Key: KAFKA-5582
> URL: https://issues.apache.org/jira/browse/KAFKA-5582
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.10.1.1
> Environment: Linux, Windows
> Reporter: Jason Aliyetti
>
> Unexpected behavior occurs when a topic is configured to preallocate files
> and has a retention policy of compact.
> When log compaction runs, the cleaner attempts to gather groups of segments
> to consolidate based on the max segment size.
> When preallocation is enabled all segments are that size and thus each
> individual segment is considered for compaction.
> When compaction does occur, the resulting cleaned file is sized based on that
> same configuration. This means that you can have very large files on disk
> that contain little or no data which partly defeats the point of compacting.
> The log cleaner should trim these segments to free up disk space. That way
> they would free up disk space and be able to be further compacted on
> subsequent runs.
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