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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