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-<?xml version="1.0" encoding="utf-8"?>
-<!--
-
- Licensed to the Apache Software Foundation (ASF) under one
- or more contributor license agreements. See the NOTICE file
- distributed with this work for additional information
- regarding copyright ownership. The ASF licenses this file
- to you under the Apache License, Version 2.0 (the
- "License"); you may not use this file except in compliance
- with the License. You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing,
- software distributed under the License is distributed on an
- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- KIND, either express or implied. See the License for the
- specific language governing permissions and limitations
- under the License.
-
--->
-
-<section id="Java-Broker-Runtime-Connection-Limit">
- <title>Connection Limits</title>
- <para>
- Each connection to the Broker consumes resources while it is connected. In order to protect
- the Broker against malfunctioning (or malicious) client processes, it is possible to limit the
- number of connections that can be active on any given port.
- </para>
- <para>
- Connection limits on AMQP ports are controlled by an attribute "maxOpenConnections" on
- the port. By default this takes the value of the context variable
- <literal>qpid.port.max_open_connections</literal> which in itself is defaulted to the
- value <literal>-1</literal> meaning there is no limit.
- </para>
- <para>
- If the interpolated value of <literal>maxOpenConnections</literal> on an AMQP port is a
- positive integer, then when that many active connections have been established no new
- connections will be allowed (until an existing connection has been closed). Any such
- rejection of a connection will be accompanied by the operational log message
- <link linkend="Java-Broker-Appendix-Operation-Logging-Message-PRT-1005">PRT-1005</link>.
- </para>
- <para>
- The context variable <literal>qpid.port.open_connections_warn_percent</literal> can be
- used to control when a warning log message is generated as the number of open connections
- approaches the limit for the port. The default value of this variable is
- <literal>80</literal> meaning that if more the number of open connections to the port
- has exceeded 80% of the given limit then the operatinal log message
- <link linkend="Java-Broker-Appendix-Operation-Logging-Message-PRT-1004">PRT-1004</link>
- will be generated.
- </para>
-</section>