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| <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">9.10. Connection Limits</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Runtime-Message-Compression.html">Prev</a> </td><th align="center" width="60%">Chapter 9. Runtime</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-Runtime-Memory.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="Java-Broker-Runtime-Connection-Limit"></a>9.10. Connection Limits</h2></div></div></div><p> |
| 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. |
| </p><p> |
| Connection limits on AMQP ports are controlled by an attribute "maxOpenConnections" on |
| the port. By default this takes the value of the context variable |
| <code class="literal">qpid.port.max_open_connections</code> which in itself is defaulted to the |
| value <code class="literal">-1</code> meaning there is no limit. |
| </p><p> |
| If the interpolated value of <code class="literal">maxOpenConnections</code> 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 |
| <a class="link" href="Java-Broker-Appendix-Operation-Logging.html#Java-Broker-Appendix-Operation-Logging-Message-PRT-1005">PRT-1005</a>. |
| </p><p> |
| The context variable <code class="literal">qpid.port.open_connections_warn_percent</code> 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 |
| <code class="literal">80</code> meaning that if more the number of open connections to the port |
| has exceeded 80% of the given limit then the operatinal log message |
| <a class="link" href="Java-Broker-Appendix-Operation-Logging.html#Java-Broker-Appendix-Operation-Logging-Message-PRT-1004">PRT-1004</a> |
| will be generated. |
| </p></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Runtime-Message-Compression.html">Prev</a> </td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Runtime.html">Up</a></td><td align="right" width="40%"> <a accesskey="n" href="Java-Broker-Runtime-Memory.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">9.9. Message Compression </td><td align="center" width="20%"><a accesskey="h" href="Apache-Qpid-Broker-J-Book.html">Home</a></td><td align="right" valign="top" width="40%"> 9.11. Memory</td></tr></table></div></div> |
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