v3.9.4

[Tochemey]

🚀 Highlights

• ⚡ Cluster engine reimplementation with a significantly improved memory footprint.
• 🛡️ Supervision improvements to prevent deadlocks and reduce flakiness.
• ✅ Expanded test coverage across critical paths and reported edge cases.
• 🧹 API cleanup: removed deprecated/obsolete cluster configuration options.

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What’s Changed

• Refactor cluster engine to improve memory footprint and overall responsiveness.
• Remove deprecated WithPeerStateLoopInterval from ActorSystem.
• Remove ClusterConfig methods:
  • WithPeersStateSyncInterval
  • PeersStateSyncInterval

  These are no longer needed—cluster coordination is now reactive rather than polling.

• Remove ClusterConfig.WithWAL.

  The cluster WAL now uses the running application's home directory to persist peer state. The file is automatically deleted on graceful shutdown.

• Enhance supervision routine to avoid potential deadlocks and reduce flakiness.
• Add extensive unit tests to cover likely use cases and previously reported issues.

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🧨 Breaking Changes / Migration Notes

If you reference any of the following in your code or configuration, you’ll need to remove or replace them:

• ActorSystem.WithPeerStateLoopInterval (removed)
• ClusterConfig.WithPeersStateSyncInterval (removed)
• ClusterConfig.PeersStateSyncInterval (removed)
• ClusterConfig.WithWAL (removed)

Why? The cluster is now event-driven and reactive, eliminating periodic polling controls and custom WAL wiring.

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⚡ Performance

• Avoided unnecessary heap allocations in hot paths.
• Reduced memory footprint of the cluster engine.

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Pull Requests

• feat: ⚡ reimplementation of cluster engine by @Tochemey in #919
• refactor: ♻️ refactor actors deployment engine by @Tochemey in #920
• chore: coverage seems broken by @Tochemey in #921
• test: add additional tests by @Tochemey in #923
• perf: ⚡ avoid some unnecessary heap allocation by @Tochemey in #926
• chore: ⬆️ dependencies update by @Tochemey in #931
• fix: supervision strategy potential deadlock and flakiness by @Tochemey in #932
• chore(deps): ⬆️ upgrade dependencies by @Tochemey in #934

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Acknowledgements

• Thanks to @GrafGenerator for helping improve memory footprint (more improvements planned in future releases).
• Thanks to @Anillc for spotting performance issues.

Full Changelog: v3.9.3...v3.9.4

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This discussion was created from the release v3.9.4.