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Date: Mon, 15 Feb 2016 23:24:18 +0000 (UTC)
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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=15147883#comment-15147883 ] 

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

Github user sudheeshkatkam commented on a diff in the pull request:

    https://github.com/apache/drill/pull/374#discussion_r52953044
  
    --- Diff: contrib/storage-hbase/src/main/java/org/apache/drill/exec/store/hbase/config/HBasePersistentStore.java ---
    @@ -148,13 +154,13 @@ private void delete(byte[] row) {
         private Result current = null;
         private Result last = null;
         private boolean done = false;
    -    private int rowsRead = 0;
     
    -    Iter() {
    +    Iter(int take) {
           try {
             Scan scan = new Scan(tableNameStartKey, tableNameStopKey);
             scan.addColumn(FAMILY, QUALIFIER);
    -        scan.setCaching(config.getMaxIteratorSize() > 100 ? 100 : config.getMaxIteratorSize());
    +        scan.setCaching(Math.min(take, 100));
    --- End diff --
    
    Is _config.getMaxIteratorSize()_ not required?


> 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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