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Benedict commented on CASSANDRA-14821:
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Do you have a branch with your prior round of improvement changes split out,
just to corroborate them (this branch has them squashed)?
Couple of minor suggestions on the branch as stands:
* Maybe worth extracting an {{assertThrows}} method accepting a lambda (with
optional predicate) for the tests?
* Maybe worth moving this into its own top level test/integration folder, or
test/distributed? Not sure; at present these are easily called unit tests, but
we anticipate non-unit tests, which might be strange to depend on the unit test
tree. It also might anyway be nice to separate out our distributed tests?
> 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
>
> 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/3d999976-0b8e-40d6-83e0-867129747cc2]|
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