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https://issues.apache.org/jira/browse/KAFKA-9471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17022400#comment-17022400
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Matthias J. Sax commented on KAFKA-9471:
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Considering KIP-216, I think we need to make sure we throw an exception if
`KafkaStream` state is DEAD or PENDING_SHUTDOWN or ERROR.
This ticket is about `StreamThread` state though. Not sure why we return an
emptyList for state DEAD but throw an exception for all others states (except
RUNNING). \cc [~vitojeng] who works on KIP-216.
> Return empty collection for PENDING_SHUTDOWN
> --------------------------------------------
>
> Key: KAFKA-9471
> URL: https://issues.apache.org/jira/browse/KAFKA-9471
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Ted Yu
> Assignee: Ted Yu
> Priority: Minor
>
> In StreamThreadStateStoreProvider we have:
> {code}
> if (streamThread.state() == StreamThread.State.DEAD) {
> return Collections.emptyList();
> {code}
> PENDING_SHUTDOWN is precursor to DEAD state.
> PENDING_SHUTDOWN should be treated the same way as DEAD.
> This makes more sense than current behavior of throwing exception for
> PENDING_SHUTDOWN.
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