[jira] [Commented] (KAFKA-3912) Query local state stores

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-3912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15384850#comment-15384850 ] 

ASF GitHub Bot commented on KAFKA-3912:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/kafka/pull/1565


> Query local state stores
> ------------------------
>
>                 Key: KAFKA-3912
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3912
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: streams
>    Affects Versions: 0.10.1.0
>            Reporter: Damian Guy
>            Assignee: Damian Guy
>             Fix For: 0.10.1.0
>
>
> Implement read-only interface and QueryableStoreType for key-value state store
> Implement read-only interface and QueryableStoreType for windowed state store
> Ensure store operations are thread-safe. I.e., a single state store could have concurrent access, e.g. one stream worker thread updating the store, and one user thread querying the store.
> Ensure failure and rebalancing is handled correctly. I.e., because the "read-only" state store interface could wrap multiple state stores, since one instance could contain multiple tasks and hence multiple state stores with the same names. Rebalance could happen migrating state stores in / out while the user is interacting with the interface.
> Add the following method to KafkaStreams
> {code} 
> public <T> T getStore(final String storeName,final QueryableStoreType<T> queryableStoreType)
> {code}



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