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https://issues.apache.org/jira/browse/DRILL-4275?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hanifi Gunes updated DRILL-4275:
--------------------------------
    Issue Type: Sub-task  (was: Improvement)
        Parent: DRILL-4186

> 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: Sub-task
>          Components: Execution - Flow
>            Reporter: Hanifi Gunes
>            Assignee: Hanifi Gunes
>
> 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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