Marek Laca created QPID-8558:
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Summary: [Broker-J] Enhance of sole connection enforcement policy
evaluation
Key: QPID-8558
URL: https://issues.apache.org/jira/browse/QPID-8558
Project: Qpid
Issue Type: Improvement
Components: Broker-J
Reporter: Marek Laca
Java broker implements the sole connection enforcement policy extension of the
AMQP 1.0 protocol. The extension ensures that the remote container can open
only one active connection to the broker at the same time.
The implementation is ineffective. When a new connection is opened the
IO-thread transfer the check to the virtual host configuration thread. The
configuration thread iterates throw all registered connections and checks their
remote container id and the policy. This technique ensures exclusive access to
the collection of the connections and nothing can be added or removed during
the check. Hence, the configuration thread works as a master thread and every
IO-thread has to wait till it receives a permission to go. The waiting time
increases with the number of open connections. The processing of the messages
is degraded, even when the user does not utilize the sole connection
enforcement policy.
The policy can be implemented as a connection limiter and there is no need for
a global lock or the usage of configuration thread. The limiter can check the
connections from different remote containers in parallel. If user does not
utilize the sole connection enforcement policy then every connection will have
a unique container id and the processing of a new incoming connection will not
be block by another connections.
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