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https://issues.apache.org/jira/browse/KAFKA-10236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax updated KAFKA-10236:
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Labels: needs-kip (was: )
> Kafka Streams | onCommit interceptor with EOS enabled
> ------------------------------------------------------
>
> Key: KAFKA-10236
> URL: https://issues.apache.org/jira/browse/KAFKA-10236
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 2.5.0
> Reporter: Vinodhini
> Priority: Major
> Labels: needs-kip
>
> Coming from
> [https://stackoverflow.com/questions/62700075/is-there-a-way-to-get-committed-offset-in-eos-kafka-stream|https://stackoverflow.com/questions/62700075/is-there-a-way-to-get-committed-offset-in-eos-kafka-stream?]
>
> *Background :*
> Setting consumer interceptor to StreamsConfig will ensure that the
> interceptor(s) are called when messages are consumed/committed. Snippet from
> {{org.apache.kafka.clients.consumer.internals.ConsumerCoordinator#commitOffsetsSync}}
>
> {code:java}
> if (future.succeeded()) {
> if (interceptors != null)
> interceptors.onCommit(offsets);
> return true;
> }{code}
>
> But the {{consumerInterceptor.onCommit()}} was never called even though I saw
> the offsets being committed at the source topic.
> *Issue:*
> I figured that it was because I was using kstreams with Exactly once
> processing guarantee enabled.
> This was the logic at
> {{org.apache.kafka.streams.processor.internals.StreamTask#commit}}
>
> {code:java}
> if (this.eosEnabled) {
> this.producer.sendOffsetsToTransaction(consumedOffsetsAndMetadata,
> this.applicationId);
> this.producer.commitTransaction();
> if (startNewTransaction) {
> this.producer.beginTransaction();
> }
> } else {
> this.consumer.commitSync(consumedOffsetsAndMetadata);
> }
> {code}
> As you can see, {{consumer.commitSync}} which in turns calls the
> {{consumerCoordinator.commit}} which calls the {{interceptor.onCommit}},
> never gets called. Because with eos enabled, it is the transaction api that
> gets invoked.
>
> *Request*
> Provide a way to get committed offset from Interceptors for EOS enabled also.
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