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Current state: [One of "Under Discussion", "Accepted", "Rejected"]
Discussion thread: here [Change the link from the KIP proposal email archive to your own email thread]
Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).
In Topology, we have methods like this:
public synchronized <KIn, VIn> Topology addGlobalStore( final StoreBuilder<?> storeBuilder, final String sourceName, final TimestampExtractor timestampExtractor, final Deserializer<KIn> keyDeserializer, final Deserializer<VIn> valueDeserializer, final String topic, final String processorName, final ProcessorSupplier<KIn, VIn, Void, Void> stateUpdateSupplier)
It would probably be better UX to preset a builder interface like:
public synchronized <KIn, VIn> Topology addGlobalStore( AddGlobalStoreParameters.fromStoreBuilder(storeBuiler) .withSourceName(sourceName) .withSourceTopic(topic) .withTimestampExtractor(timestampExtractor) .withKeyDeserializer(keyDeserializer) .withValueDeserializer(valueDeserializer) .withProcessorName(processorName) .withStateUpdateSupplier(stateUpdateSupplier) )
Briefly list any new interfaces that will be introduced as part of this proposal or any existing interfaces that will be removed or changed. The purpose of this section is to concisely call out the public contract that will come along with this feature.
A public interface is any change to the following:
Binary log format
The network protocol and api behavior
Any class in the public packages under clientsConfiguration, especially client configuration
org/apache/kafka/clients/consumer (eventually, once stable)
Command line tools and arguments
- Anything else that will likely break existing users in some way when they upgrade
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
- What impact (if any) will there be on existing users?
- If we are changing behavior how will we phase out the older behavior?
- If we need special migration tools, describe them here.
- When will we remove the existing behavior?
If there are alternative ways of accomplishing the same thing, what were they? The purpose of this section is to motivate why the design is the way it is and not some other way.