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https://issues.apache.org/jira/browse/CASSANDRA-13475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16245913#comment-16245913
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Blake Eggleston commented on CASSANDRA-13475:
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Steps 4-11 all involve moving stuff into something called the CQLStorageEngine. 
Earlier in the discussion, this was the native cassandra implementation of the 
proposed storage interface. I guess that might have changed, but it's not 
really clear what CQLStorageEngine is

> First version of pluggable storage engine API.
> ----------------------------------------------
>
>                 Key: CASSANDRA-13475
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13475
>             Project: Cassandra
>          Issue Type: Sub-task
>            Reporter: Dikang Gu
>            Assignee: Dikang Gu
>
> In order to support pluggable storage engine, we need to define a unified 
> interface/API, which can allow us to plug in different storage engines for 
> different requirements. 
> Here is a design quip we are currently working on:  
> https://quip.com/bhw5ABUCi3co
> In very high level, the storage engine interface should include APIs to:
> 1. Apply update into the engine.
> 2. Query data from the engine.
> 3. Stream data in/out to/from the engine.
> 4. Table operations, like create/drop/truncate a table, etc.
> 5. Various stats about the engine.
> I create this ticket to start the discussions about the interface.



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