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https://issues.apache.org/jira/browse/KAFKA-7075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16635191#comment-16635191
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ASF GitHub Bot commented on KAFKA-7075:
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lmontrieux opened a new pull request #5725: KAFKA-7075: Allow
Topology#addGlobalStore to add a window store
URL: https://github.com/apache/kafka/pull/5725
`Topology#addGlobalStore` takes any `StoreBuilder`, but
`InternalTopologyBuilder#addGlobalStore` restricts it to
`StoreBuilder<KeyValueStore>`. This PR relaxes the restriction in
`InternalTopologyBuilder#addGlobalStore` to match `Topology#addGlobalStore`.
Testing: adds a new unit test to show that a StoreBuilder<WindowStore> can
be used in InternalTopologyBuilder#addGlobalStore. This required creating two
new mocks, `MockWindowStore` and `MockWindowStoreBuilder`, modelled on
`MockKeyValueStore` and `MockKeyValueStoreBuilder`, respectively.
### Committer Checklist (excluded from commit message)
- [ ] Verify design and implementation
- [ ] Verify test coverage and CI build status
- [ ] Verify documentation (including upgrade notes)
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> Allow Topology#addGlobalStore to add a window store
> ---------------------------------------------------
>
> Key: KAFKA-7075
> URL: https://issues.apache.org/jira/browse/KAFKA-7075
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Guozhang Wang
> Assignee: Nishanth Pradeep
> Priority: Major
> Labels: newbie
>
> Today although {{Topology#addGlobalStore}} can take any {{StateStore}} types,
> the internal implementation {{InternalTopologyBuilder#addGlobalStore}} only
> accepts {{StoreBuilder<KeyValueStore>}}. It means if users pass in a windowed
> store builder in {{Topology#addGlobalStore}} it will cause a runtime
> ClassCastException.
> We should fix this issue by relaxing the {{InternalTopologyBuilder}}.
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