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https://issues.apache.org/jira/browse/CASSANDRA-14821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16648891#comment-16648891
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Stefan Podkowinski commented on CASSANDRA-14821:
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I understand the intention and motivation behind this effort. No justification
needed. Alex asked for early feedback and I responded that more complex,
real-world test cases would help evaluating the usefulness and advantages of
the provided code over existing testing approaches. His Jira comment and the
corresponding PR now seem to be deleted/closed, so it looks like this is still
largely work in progress at this point.
> 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
> Reporter: Alex Petrov
> Assignee: Alex Petrov
> Priority: Major
>
> Currently, dtests are complex to write, hard to modify and slow to run. The
> only option to manipulate a cluster state is either to shut down nodes or run
> unreliable Byteman queries.
> In order to improve the situation, a new Distributed Tester is proposed. 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.
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