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Only allow brokers that authenticate as the cluster-username to join a cluster.
New broker first connects to a cluster broker authenticates as the cluster-username
and sends its CPG member ID to the qpid.cluster-credentials exchange.
The cluster broker that subsequently acts as updater verifies that the credentials are
valid before connecting to give the update.
NOTE 1: If you are using an ACL, the cluster-username must be allowed to
publish to the qpid.cluster-credentials exchange. E.g. in your ACL file:
acl allow foo@QPID publish exchange name=qpid.cluster-credentials
NOTE 2: This changes the cluster initialization protocol, you will
need to restart the cluster with all new version brokers.
git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@1210989 13f79535-47bb-0310-9956-ffa450edef68
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