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https://issues.apache.org/jira/browse/KAFKA-9373?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismael Juma resolved KAFKA-9373.
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Fix Version/s: 2.6.0
Resolution: Fixed
> Improve shutdown performance via lazy accessing the offset and time indices.
> ----------------------------------------------------------------------------
>
> Key: KAFKA-9373
> URL: https://issues.apache.org/jira/browse/KAFKA-9373
> Project: Kafka
> Issue Type: Bug
> Components: log
> Affects Versions: 2.3.0, 2.4.0, 2.3.1
> Reporter: Adem Efe Gencer
> Assignee: Adem Efe Gencer
> Priority: Major
> Fix For: 2.6.0
>
>
> KAFKA-7283 enabled lazy mmap on index files by initializing indices on-demand
> rather than performing costly disk/memory operations when creating all
> indices on broker startup. This helped reducing the startup time of brokers.
> However, segment indices are still created on closing segments, regardless of
> whether they need to be closed or not.
>
> Ideally we should:
> * Improve shutdown performance via lazy accessing the offset and time
> indices.
> * Eliminate redundant disk accesses and memory mapped operations while
> deleting or renaming files that back segment indices.
> * Prevent illegal accesses to underlying indices of a closed segment, which
> would lead to memory leaks due to recreation of the underlying memory mapped
> objects.
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