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Security mechanism by which users may be granted permissions to perform the various operations on a broker from a client.

For a detailed discussion, see the following resources:
Qpid Design - Access Control Lists
Qpid ACLs
ACL (v2 ACL format specification, used on both Java and C++ brokers)
Java XML ACLs (deprecated: v1 XML-based ACL format specification used on M4 release Java broker)

Clustering

Module which allows several brokers to form an active-active or high availability (HA) cluster, primarily for reliability.

For a detailed discussion, see the following resources:
Starting a cluster
Persistent Cluster Restart Design Note
Old Clustering Design Note

Federation

Management Exchange

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