[jira] [Created] (CASSANDRA-15539) Extract in-jvm API and tests out of Cassandra and into a separate repository

["Alex Petrov (Jira)" <ji...@apache.org>]

Alex Petrov created CASSANDRA-15539:
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             Summary: Extract in-jvm API and tests out of Cassandra and into a separate repository
                 Key: CASSANDRA-15539
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15539
             Project: Cassandra
          Issue Type: Task
            Reporter: Alex Petrov
            Assignee: Alex Petrov


Extract in-jvm DTest _API_ and tests into a separate repository that is shared between Cassandra branches. Tests themselves should be buildable using just API, wwhich is not  the case now, since cluster creation relies on impl package, since we do not have factories / constructors in API.

Main goals we’re trying to achieve:
1. We should be able to fail a build on API incompatibility between versions 
2. Make it as easy as possible to detect break APIs between versions. 
3. Make development of _tests_ based on in-jvm framework simpler
4. Reduce surface area of impact when making modifications to tests 

Potentially, we’d also like to use a plugin to detect API incompatibilities between in-jvm DTest API and in-branch implementations, and start running tests using shared in-jvm test repository with each existing implementation in the branch. This entails both running tests for all branches whenever there’s a change in tests jar and running tests for a specific branch whenever the branch has changed.



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