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https://issues.apache.org/jira/browse/KAFKA-20940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ken Huang resolved KAFKA-20940.
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Resolution: Fixed
> Windowed changelog restore optimization is skipped whenever a checkpointed
> offset exists
> ----------------------------------------------------------------------------------------
>
> Key: KAFKA-20940
> URL: https://issues.apache.org/jira/browse/KAFKA-20940
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 4.3.0, 4.4.0
> Reporter: Bill Bejeck
> Assignee: Alan Lau
> Priority: Major
> Fix For: 4.3.2, 4.5.0, 4.4.1
>
>
> KAFKA-13499 added an optimization to StoreChangelogReader that avoids
> restoring already-expired records for windowed/session stores by seeking to
> latestChangelogTimestamp - retentionPeriod instead of seeking to the
> beginning.
> However, in StoreChangelogReader#prepareChangelogs the optimization only
> executes when no start offset is available. When a start offset is found, the
> reader unconditionally does restoreConsumer.seek(partition, currentOffset +
> 1) and restores every record from that offset forward.
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