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• Producer flow control
• Java Broker - AMQP0-9 Tactical Producer Flow Control
• QPID-942.

Transactions

Local one-phase commit (1PC) transactions ensure atomicity over a number of otherwise disconnected actions on the broker (such as publishing or consuming a number of messages in a group). For local transactions, the broker creates an internal transaction ID and uses it to track the state of the transaction. The client must either commit or abort the transaction to close it.

Distributed Transactions

Distributed two-phase commit (2PC) transactions ensure atomicity over a number of otherwise disconnected actions on a distributed system (which involve two or more brokers and/or clients). This operation is usually coordinated by an external transaction monitor which creates transaction IDs and controls the state of the transaction.

For a detailed discussion, see the following resources:
The AMQP Distributed Transaction Classes

SSL

RDMA

Broker Features

Access Control Lists (ACL)

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