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https://issues.apache.org/jira/browse/KAFKA-5247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apurva Mehta updated KAFKA-5247:
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Issue Type: Sub-task (was: Bug)
Parent: KAFKA-4815
> Consumer GroupCoordinator should continue to materialize committed offsets in
> offset order even for transactional offset commits
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-5247
> URL: https://issues.apache.org/jira/browse/KAFKA-5247
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Apurva Mehta
> Labels: exactly-once
> Fix For: 0.11.0.0
>
>
> In the TxnOffsetCommit patch, we thought it was ok for the group coordinator
> to use "transaction order" semantics when updating the cache, but we weren't
> thinking about the log cleaner.
> The log cleaner uses offset order when cleaning which means that the key with
> the largest offset always wins. So if we use transaction order when
> dynamically updating the cache, we will get different results from when we're
> loading the cache (even if the loading logic also uses transaction order).
> The fix should be straightforward: we need to remember the offset in the
> offsets topic of the offset that we cache. Then we only update it if the new
> entry has a higher offset.
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