Status

Current state: Under Discussion

Discussion thread:

JIRA: JIRA 6657

Motivation

Kafka Streams allows to pass in different configs for different clients by prefixing the corresponding parameter with `producer.` or `consumer.`.

However, Kafka Streams internally uses multiple consumers, (1) the main consumer (2) the restore consumer and (3) the global consumer

For some use cases, it's required to set different configs for different consumers. Thus, we should add two new prefix for restore and global consumer. 

We might also consider to extend `KafkaClientSupplier` and add a `getGlobalConsumer()` method.

Public Interfaces

// Current KafkaClientSupplier consumer APIs: 
Consumer<byte[], byte[]> getConsumer(final Map<String, Object> config);
Consumer<byte[], byte[]> getRestoreConsumer(final Map<String, Object> config);
// New API for global consumer:
Consumer<byte[], byte[]> getGlobalConsumer(final Map<String, Object> config); 

Proposed Changes

Describe the new thing you want to do in appropriate detail. This may be fairly extensive and have large subsections of its own. Or it may be a few sentences. Use judgement based on the scope of the change.

Compatibility, Deprecation, and Migration Plan

There is no backward compatibility issue as we are not deprecating any public API, and the underlying change should be transparent to the user.

Rejected Alternatives

Non.