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We've tried to collect some of the major components or subsystems that we want to ensure work properly towards having a great 4.0 release. If you think something is missing please add it. Better yet volunteer to contribute to testing it!

✅ Internode Messaging

In 4.0 we're getting a new Netty based inter-node communication system (CASSANDRA-8457). As internode messaging is vital to the correctness and performance of the database we should make sure that all forms (TLS, compressed, low latency, high latency, etc ...) of internode messaging function correctly.

Shepherd: Shepherds: Benedict Elliott Smith, Aleksey Yeshchenko, Jason Brown

Tracking Ticket: CASSANDRA-14746Tickets:

Contributors: Vinay Chella, Jordan West, Dinesh Joshi, Joey Lynch, Sumanth Pasupuleti, Benedict Elliott Smith, Aleksey Yeshchenko

Current Status: Planned work toward validating the stability and performance of internode messaging in Apache Cassandra 4.0 is nominally complete. Minor improvements and bug fixes may follow if identified during the alpha/beta/RC-cycle.

The test plan for internode messaging changes is located at 4.0 Internode Messaging Test Plan. Note especially the "Randomised Testing" section, with tests implemented under test/burn/oac/net. Contributors have exercised these changes via the burn suite with over 16,000 cumulative core-hours dedicated to validation as implemented in Verifier.

Local Read/Write Path

Testing in this area refers to the local read/write path (StorageProxy, ColumnFamilyStore, Memtable, SSTable reading/writing, etc). We are still finding numerous bugs and issues with the 3.0 storage engine rewrite (CASSANDRA-8099). For 4.0 we want to ensure that we thoroughly cover the local read/write path with techniques such as property-based testing, fuzzing (example), and a source audit.

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