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Subject: [jira] [Commented] (DRILL-4275) Refactor e/pstore interfaces and
 their factories to provide a unified mechanism to access stores
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    [ https://issues.apache.org/jira/browse/DRILL-4275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15103880#comment-15103880 ] 

ASF GitHub Bot commented on DRILL-4275:
---------------------------------------

Github user jacques-n commented on the pull request:

    https://github.com/apache/drill/pull/325#issuecomment-172369155
  
    You want to do a hangout to discuss the concept of EStores and watches and the relationship with the ClusterCoordinator interface. We're currently actively in the process of implementing a new EStore/PStore pair and I'd like to figure out the best way to improve the interface without major disruption to the work we're doing.


> Refactor e/pstore interfaces and their factories to provide a unified mechanism to access stores
> ------------------------------------------------------------------------------------------------
>
>                 Key: DRILL-4275
>                 URL: https://issues.apache.org/jira/browse/DRILL-4275
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Execution - Flow
>            Reporter: Hanifi Gunes
>            Assignee: Deneche A. Hakim
>
> We rely on E/PStore interfaces to persist data. Even though E/PStore stands for Ephemeral and Persistent stores respectively, the current design for EStore does not extend the interface/functionality of PStore at all, which hints abstraction for EStore is redundant. This issue proposes a new unified Store interface replacing the old E/PStore that exposes an additional method that report persistence level as follows:
> {code:title=Store interface}
> interface Store<V> {
>   StoreMode getMode();
>   V get(String key);
>   ...
> }
> enum StoreMode {
>   EPHEMERAL,
>   PERSISTENT,
>   ...
> }
> {code}
> The new design brings in less redundancy, more centralized code, ease to reason and maintain.



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