[jira] [Created] (KAFKA-18996) Expose addReadOnlyStateStore (

["Hartmut Armbruster (Jira)" <ji...@apache.org>]

Hartmut Armbruster created KAFKA-18996:
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             Summary: Expose addReadOnlyStateStore (
                 Key: KAFKA-18996
                 URL: https://issues.apache.org/jira/browse/KAFKA-18996
             Project: Kafka
          Issue Type: Improvement
          Components: streams
            Reporter: Hartmut Armbruster


With [KIP-813|https://cwiki.apache.org/confluence/display/KAFKA/KIP-813%3A+Shareable+State+Stores], new 'read-only state store' were introduced. The initial scope was to add builder.table() (with "source topic optimization") to the PAPI, and is now implemented on the Topology class: [Topology#addReadOnlyStateStore(_)|https://kafka.apache.org/38/javadoc/org/apache/kafka/streams/Topology.html#addReadOnlyStateStore(org.apache.kafka.streams.state.StoreBuilder,java.lang.String,org.apache.kafka.streams.processor.TimestampExtractor,org.apache.kafka.common.serialization.Deserializer,org.apache.kafka.common.serialization.Deserializer,java.lang.String,java.lang.String,org.apache.kafka.streams.processor.api.ProcessorSupplier)]
h4. Proposed Changes

Expose the new functionality via a new _public interface_ on {{{}org.apache.kafka.streams.StreamsBuilder{}}}.

(a similar interface also exists for global state store -> [StreamsBuilder.addGlobalStore(_)|https://kafka.apache.org/38/javadoc/org/apache/kafka/streams/StreamsBuilder.html#addGlobalStore(org.apache.kafka.streams.state.StoreBuilder,java.lang.String,org.apache.kafka.streams.kstream.Consumed,org.apache.kafka.streams.processor.ProcessorSupplier])
h4. Footnotes

Here's a related discussion on community slack: 
[https://confluentcommunity.slack.com/archives/C48AHTCUQ/p1741813060927299?thread_ts=1741539889.829939&cid=C48AHTCUQ] 



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