[jira] [Created] (KAFKA-7918) Streams store cleanup: inline byte-store generic parameters

["John Roesler (JIRA)" <ji...@apache.org>]

John Roesler created KAFKA-7918:
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             Summary: Streams store cleanup: inline byte-store generic parameters
                 Key: KAFKA-7918
                 URL: https://issues.apache.org/jira/browse/KAFKA-7918
             Project: Kafka
          Issue Type: Improvement
          Components: streams
            Reporter: John Roesler


Currently, the fundamental layer of stores in Streams is the "bytes store".

The easiest way to identify this is in `org.apache.kafka.streams.state.Stores`, all the `StoreBuilder`s require a `XXBytesStoreSupplier`. 

We provide several implementations of these bytes stores, typically an in-memory one and a persistent one (aka RocksDB).

Inside these bytes stores, the key is always `Bytes` and the value is always `byte[]` (serialization happens at a higher level). However, the store implementations are generically typed, just `K` and `V`.

This is good for flexibility, but it makes the code a little harder to understand. I think that we used to do serialization at a lower level, so the generics are a hold-over from that.

It would simplify the code if we just inlined the actual k/v types and maybe even renamed the classes from (e.g.) `InMemoryKeyValueStore<K,V>` to `InMemoryKeyValueBytesStore`, and so forth.



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