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1. any errors appeared during processing local Cut.
2. if a transaction is recovered with transaction recovery protocol (tx.finalizationStatus == RECOVERY_FINISH).
3. if transaction finished in UNKNOWN state.
4. topology change.

Wrapping messages

On the picture below on left side is a diagram of sending transaction messages. Before sending message it checks whether cut is running. If it is then wraps the message, otherwise send ordinary message (PrepareRequest in example).

Ignite transaction protocol includes multiple messages. But only some of them affects meaningful (relating to the algorithm) that change state of transactions (PREPARED, COMMITTED):

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