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https://issues.apache.org/jira/browse/KAFKA-14123?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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A. Sophie Blee-Goldman resolved KAFKA-14123.
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Resolution: Not A Problem
> Delete with null value not supported in Streams PersistantWindowsStore
> ----------------------------------------------------------------------
>
> Key: KAFKA-14123
> URL: https://issues.apache.org/jira/browse/KAFKA-14123
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 3.0.0
> Reporter: Pawan Sharma
> Priority: Major
>
> Unable to delete an Window entry from Persistant Windows Store by passing
> null value in the body.
>
> Put in this class does not check if the value is null and invoke the remove
> method.
> [https://github.com/apache/kafka/blob/3.0.0/streams/src/main/java/org/apache/kafka/streams/state/internals/AbstractRocksDBSegmentedBytesStore.java]
>
> Where as the same feature is working in InMemoryWindowsStore, where the null
> values are treated as delete. line no 126.
> [https://github.com/apache/kafka/blob/3.0.0/streams/src/main/java/org/apache/kafka/streams/state/internals/InMemoryWindowStore.java]
>
> This behaviour is little in contrast to all other stores including kv stores,
> where a null value is treated as delete and also complys with the behaviour
> of compressed Kafka topic.
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