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Nevertheless, the atomic protocol implementation in Ignite 2.x has multiple flaws - absence of atomicity for batch operations (de facto atomicity per key), best effort consistency, side effects during retries on non-idempotent operations, the presence of PartialUpdateException for manual retries when automatic is not possible. Moreover, if a cache was created in ATOMIC mode, no transaction can be run on it due to protocols incompatibility.

In upcoming Ignite 3 strong consistency is provided by RAFT replication, but batch updates are still not atomic, causing the same issues as in Ignite 2.x

Looks like we need only one cache type in Ignite 3 with strong guarantees for a better user experience.

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