akkadotnet/akka.net 1.5.67

Akka.NET v1.5.67

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1.5.67 April 25th, 2026

Akka.NET v1.5.67 is a hotfix release that reverts a breaking change to the persistence plugin contract introduced in v1.5.66.

Akka.Persistence: Revert async WriteMessagesAsync/SaveAsync dispatch (#8163)

v1.5.66 added Task.Yield() inside AsyncWriteJournal.ExecuteBatch and SnapshotStore to move persistence plugin WriteMessagesAsync/SaveAsync calls off the actor thread. While this improved throughput in benchmarks, it silently broke the implicit contract that persistence plugins rely on — that the synchronous preamble of these methods executes in actor context.

This caused failures in plugins that:

• Access Self inside WriteMessagesAsync (e.g. Akka.Persistence.Sql, Akka.Persistence.EventStore) — throws NotSupportedException off the actor thread
• Use non-thread-safe collections for write tracking (e.g. Dictionary<string, Task>) — concurrent access from actor thread and thread pool causes InvalidOperationException
• Send messages to subscribers after writes complete (e.g. Akka.Persistence.Redis) — accesses shared actor state off-thread

This release removes the Task.Yield() calls and restores the original dispatch behavior. A future version may reintroduce this optimization with a more targeted approach that preserves the plugin threading contract.

If you are on v1.5.66, upgrade to v1.5.67 immediately if you use any third-party persistence plugin.

Changes:

• 2f057e4 Update RELEASE_NOTES.md for 1.5.67 release
• 46371dd revert(persistence): remove Task.Yield() from AsyncWriteJournal and SnapshotStore (#8163)

This list of changes was auto generated.