Eno Thereska resolved KAFKA-3777.
    Resolution: Fixed

> Extract the existing LRU cache out of RocksDBStore
> --------------------------------------------------
>                 Key: KAFKA-3777
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3777
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: streams
>    Affects Versions:
>            Reporter: Eno Thereska
>            Assignee: Damian Guy
>             Fix For:
> The LRU cache that is currently inside the RocksDbStore class. As part of 
> KAFKA-3776 it needs to come outside of RocksDbStore and be a separate 
> component used in:
> 1. KGroupedStream.aggregate() / reduce(), 
> 2. KStream.aggregateByKey() / reduceByKey(),
> 3. KTable.to() (this will be done in KAFKA-3779).
> As all of the above operators can have a cache on top to deduplicate the 
> materialized state store in RocksDB.
> The scope of this JIRA is to extract out the cache of RocksDBStore, and keep 
> them as item 1) and 2) above; and it should be done together / after 
> KAFKA-3780.
> Note it is NOT in the scope of this JIRA to re-write the cache, so this will 
> basically stay the same record-based cache we currently have.

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