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https://issues.apache.org/jira/browse/KAFKA-3777?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eno Thereska resolved KAFKA-3777.
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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: 0.10.1.0
> Reporter: Eno Thereska
> Assignee: Damian Guy
> Fix For: 0.10.1.0
>
>
> 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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