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https://issues.apache.org/jira/browse/KAFKA-20777?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bill Bejeck resolved KAFKA-20777.
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Resolution: Fixed
> StagedMergeIterator throws IllegalStateException instead of
> InvalidStateStoreException when used after store close
> ------------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-20777
> URL: https://issues.apache.org/jira/browse/KAFKA-20777
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 4.4.0
> Reporter: Alan Lau
> Assignee: Alan Lau
> Priority: Blocker
> Fix For: 4.4.0
>
>
> When transactional state stores are enabled
> (enable.transactional.statestores=true), an open StagedMergeIterator that is
> used after the store is closed throws
> java.lang.IllegalStateException("Iterator has already been closed.") from
> StagedMergeIterator.hasNext(), for consistency with the other managed store
> iterators (e.g. RocksDbIterator), it should throw InvalidStateStoreException.
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