[jira] [Updated] (KAFKA-2594) Add a key-value store that is a fixed-capacity in-memory LRU cache

["Randall Hauch (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-2594?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Randall Hauch updated KAFKA-2594:
---------------------------------
    Status: Patch Available  (was: Open)

This contribution is ready for review.

> Add a key-value store that is a fixed-capacity in-memory LRU cache 
> -------------------------------------------------------------------
>
>                 Key: KAFKA-2594
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2594
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: kafka streams
>            Reporter: Randall Hauch
>            Assignee: Randall Hauch
>             Fix For: 0.9.0.0
>
>
> The current {{KeyValueStore}} implementations are not limited in size, and thus are less useful for some use cases. This subtask will add a simple key-value store that maintains in memory at most a maximum number of entries that were recently read or written. When the cache size reaches the capacity and a new entry is to be added, the least recently used entry will be automatically purged from the cache. This key-value store will extend {{MeteredKeyValueStore}} for monitoring and recording of changes to a backing topic, enabling recovery of the cache contents from the replicated state.



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