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https://issues.apache.org/jira/browse/CASSANDRA-14821?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C. Scott Andreas updated CASSANDRA-14821:
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    Component/s: Testing

> Make it possible to run multi-node coordinator/replica tests in a single JVM
> ----------------------------------------------------------------------------
>
>                 Key: CASSANDRA-14821
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14821
>             Project: Cassandra
>          Issue Type: Test
>          Components: Testing
>            Reporter: Alex Petrov
>            Assignee: Alex Petrov
>            Priority: Major
>
> This patch proposes an in-JVM Distributed Tester that can help to write 
> distributed tests in a single JVM and be able to control node behaviour in a 
> fine-grained way and set up nodes exactly how one needs it: configuration 
> settings, parameters, which are also controllable in runtime on a per node 
> basis, so each node can have its own unique state.
> It fires up multiple Cassandra Instances in a single JVM. It is done through 
> having distinct class loaders in order to work around the singleton problem 
> in Cassandra. In order to be able to pass some information between the nodes, 
> a common class loader is used that loads up java standard library and several 
> helper classes. Tests look a lot like CQLTester tests would usually look like.
> Each Cassandra Instance, with its distinct class loader is using 
> serialisation and class loading mechanisms in order to run instance-local 
> queries and execute node state manipulation code, hooks, callbacks etc.
> First version mocks out Messaging Service and simplifies schema management by 
> simply running schema change commands on each of the instances separately. 
> Internode communication is mocked by passing ByteBuffers through shared class 
> loader.
> |[patch|https://github.com/ifesdjeen/cassandra/tree/14821]|[tests|https://circleci.com/workflow-run/b371e72d-9dc8-455d-acb3-45cd8be1386b]|



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