[Discussion] Carbon Store abstraction

Posted by Jacky Li on Oct 19, 2017; 2:25pm
URL: http://apache-carbondata-dev-mailing-list-archive.168.s1.nabble.com/Discussion-Carbon-Store-abstraction-tp24337.html

Hi community,

I am proposing to create a carbondata-store module to abstract the carbon store concept. The reason is:

1. Initially, carbon is designed as a file format, as it evolves to provide more features, it implemented more and more functionalities in the spark integration module. However, as community is trying to integrate more and more compute framework with carbon, these functionalities is duplicated across integration layer. Idealy, these functionality can be unified and provided in one place.

2. The current interface of carbondata exposed to user is through SQL, but the developer interface for developers who want to do compute engine integration is not very clear.

3. There are many SQL command that carbon supported, but they are implemented through spark RDD only. It is not sharable across compute framework.

Due to these reasons, for the long term future of carbondata, I think it is better to abstract the interface for compute engine integration within a new module called carbondata-store. It can wrap all store level functionalities that above file format in an independent module of compute engine, so that every integration module can depends on it and duplicate code is removed.

This is a continuous effort for long term, I will break this work into subtask and start it by creating JIRA issue, if you agree.

Regards,
Jacky Li