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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> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks!</a></li> + <li><a href="/security.html">Security</a></li> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2015 + The Apache Software Foundation; Licensed under + the <a href="http://www.apache.org/licenses/LICENSE-2.0";>Apache + License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton, + Proton, Apache, the Apache feather logo, and the Apache Qpid + project logo are trademarks of The Apache Software + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </div> + </body> +</html>
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The standard behaviours of consumers are defined by the respective AMQP specification, however in addition + to the standard behaviours a number of Qpid specific enhancements are available</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Consumers-Prioirty"></a>9.7.1. Priority</h3></div></div></div><p>By default, when there are multiple competing consumers attached to the same message source, the Broker + attempts to distribute messages from the queue in a "fair" manner. Some use cases require allocation of messages + to consumers to be based on the "priority" of the consumer. Where there are multiple consumers having differing + priorities, the Broker will always attempt to deliver a message to a higher priority consumer before attempting + delivery to a lower priority consumer. That is, a lower priority consumer will only receive a message if no + higher priority consumers currently have credit available to consume the message, or those consumers have declined + to accept the message (for instance because it does not meet the criteria of any selectors associated with the + consumer).</p><p>Where a consumer is created with no explicit priority provided, the consumer is given the highest possible + priority.</p><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e5973"></a>9.7.1.1. Creating a Consumer with a non-standard priority</h4></div></div></div><p> + In AMQP 0-9 and 0-9-1 the priority of the consumer can be set by adding an entry into the table provided as the + <code class="literal">arguments</code> field (known as the <code class="literal">filter</code> field on AMQP 0-9) of the + <code class="literal">basic.consume</code> method. The key for the entry must be the literal short string + <code class="literal">x-priority</code>, and the value of the entry must be an integral number in the range + -2<sup>31</sup> to 2<sup>31</sup>-1. + </p><p> + In AMQP 0-10 the priority of the consumer can be set in the map provided as the <code class="literal">arguments</code> + field of the <code class="literal">message.subscribe</code> method. The key for the entry must be the literal string + <code class="literal">x-priority</code>, and the value of the entry must be an integral number in the range + -2<sup>31</sup> to 2<sup>31</sup>-1. + </p><p> + In AMQP 1.0 the priority of the consumer is set in the <code class="literal">properties</code> map of the + <code class="literal">attach</code> frame where the broker side of the link represents the sending side of the link. + The key for the entry must be the literal string <code class="literal">priority</code>, and the value of the entry must + be an integral number in the range -2<sup>31</sup> to 2<sup>31</sup>-1. + </p><p> + When using the Qpid JMS client for AMQP 0-9/0-9-1/0-10 the consumer priority can be set in the address being + used for the Destination object. + + </p><div class="table"><a id="d0e6032"></a><p class="title"><strong>Table 9.1. Setting the consumer priority</strong></p><div class="table-contents"><table border="1" summary="Setting the consumer priority"><colgroup><col /><col /></colgroup><thead><tr><th>Syntax</th><th>Example</th></tr></thead><tbody><tr><td>Addressing</td><td>myqueue : { link : { x-subscribe: { arguments : { x-priority : '10' } } } }</td></tr><tr><td>Binding URL</td><td>direct://amq.direct/myqueue/myqueue?x-qpid-replay-priority='10'</td></tr></tbody></table></div></div><p><br class="table-break" /> + </p></div></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Runtime-Flow-To-Disk.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-Background-Recovery.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">9.6. Flow to Disk </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%"> 9.8. Background Recovery</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks!</a></li> + <li><a href="/security.html">Security</a></li> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2015 + The Apache Software Foundation; Licensed under + the <a href="http://www.apache.org/licenses/LICENSE-2.0";>Apache + License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton, + Proton, Apache, the Apache feather logo, and the Apache Qpid + project logo are trademarks of The Apache Software + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </div> + </body> +</html> http://git-wip-us.apache.org/repos/asf/qpid-site/blob/0e1f0cc4/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Disk-Space-Management.html ---------------------------------------------------------------------- diff --git a/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Disk-Space-Management.html b/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Disk-Space-Management.html new file mode 100644 index 0000000..35dff25 --- /dev/null +++ b/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Disk-Space-Management.html @@ -0,0 +1,184 @@ +<!DOCTYPE html> +<!-- + - + - Licensed to the Apache Software Foundation (ASF) under one + - or more contributor license agreements. 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This is supported by the BDB and Derby virtualhosts. + </p><p> + This functionality blocks all producers on reaching the disk overflow limit. When consumers consume the + messages, causing disk space usage to falls below the underflow limit, the producers are unblocked and continue + working as normal. + </p><p> + Two limits can be configured: + </p><p> + overfull limit - the maximum space on disk (in bytes). + </p><p> + underfull limit - when the space on disk drops below this limit, producers are allowed to resume publishing. + </p><p> + The overfull and underful limit can be specified when a new virtualhost is created or an exiting virtualhost is + edited. This can be done using the Store Overflow and Store Underfull settings within the virtual host creation + and edit dialogue. If editing an existing virtualhost, the virtualhost must be restarted for the new values to + take effect. + </p><p> + The disk quota functionality is based on "best effort" principle. This means the broker cannot guarantee that + the disk space limit will not be exceeded. If several concurrent transactions are started before the limit is + reached, which collectively cause the limit to be exceeded, the broker may allow all of them to be committed. + </p><p> + The Broker will also impose flow control if the filesystem hosting a virtualhost exceeds a <a class="link" href="Java-Broker-Management-Managing-Broker.html#Java-Broker-Management-Managing-Broker-Context-StoreFilesystemMaxUsagePercent">configured + percentage.</a>. + </p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p> + The <span class="emphasis"><em>Producer Flow Control</em></span> can be configured on individual queue using + <span class="emphasis"><em>Producer Flow Control</em></span> overflow policy. + For more details, please read<a class="xref" href="Java-Broker-Concepts-Queues.html#Java-Broker-Concepts-Queue-OverflowPolicy" title="4.7.5. Controlling Queue Size">Section 4.7.5, “Controlling Queue Size”</a>. + </p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e5723"></a>9.2.1.1. Broker Log Messages for quota flow control</h4></div></div></div><p> + There are two broker log messages that may occur if flow control through disk quota limits is enabled. When + the virtual host is blocked due to exceeding of the disk quota limit the following message appears in the + broker log + </p><pre class="programlisting"> + [vh(/test)/ms(BDBMessageStore)] MST-1008 : Store overfull, flow control will be enforced + </pre><p> + When virtual host is unblocked after cleaning the disk space the following message appears in the broker log + </p><pre class="programlisting"> + [vh(/test)/ms(BDBMessageStore)] MST-1009 : Store overfull condition cleared + </pre><p> + </p></div></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Runtime.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-Producer-Transaction-Timeout.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">Chapter 9. Runtime </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%"> 9.3. Producer Transaction Timeout</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks!</a></li> + <li><a href="/security.html">Security</a></li> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2015 + The Apache Software Foundation; Licensed under + the <a href="http://www.apache.org/licenses/LICENSE-2.0";>Apache + License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton, + Proton, Apache, the Apache feather logo, and the Apache Qpid + project logo are trademarks of The Apache Software + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </div> + </body> +</html> http://git-wip-us.apache.org/repos/asf/qpid-site/blob/0e1f0cc4/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Flow-To-Disk.html ---------------------------------------------------------------------- diff --git a/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Flow-To-Disk.html b/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Flow-To-Disk.html new file mode 100644 index 0000000..d081bbb --- /dev/null +++ b/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Flow-To-Disk.html @@ -0,0 +1,157 @@ +<!DOCTYPE html> +<!-- + - + - Licensed to the Apache Software Foundation (ASF) under one + - or more contributor license agreements. 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Once this + limit is reached any new transient messages and all existing transient messages will be + transferred to disk. Newly arriving transient messages will continue to go to the disk until the + cumulative size of all messages falls below the limit once again.</p><p>By default the Broker makes 75% of the max direct available memory for messages. This memory is + divided between all the queues across all virtual hosts defined on the Broker with a percentage + calculated according to their current queue size. These calculations are refreshed periodically + by the housekeeping cycle.</p><p>For example if there are two queues, one containing 75MB and the second 100MB messages + respectively and the Broker has 1GB direct memory with the default of 75% available for messages. + The first queue will have a target size of 320MB and the second 430MB. Once 750MB is taken by + messages, messages will begin to flow to disk. New messages will cease to flow to disk when + their cumulative size falls beneath 750MB.</p><p>Flow to disk is configured by Broker context variable + <code class="literal">broker.flowToDiskThreshold</code>. It is expressed as a size in bytes and defaults + to 75% of the JVM maximum heap size.</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-Close-Connection-When-No-Route.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-Consumers.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">9.5. Closing client connections on unroutable mandatory messages </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%"> 9.7. Consumers</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks!</a></li> + <li><a href="/security.html">Security</a></li> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2015 + The Apache Software Foundation; Licensed under + the <a href="http://www.apache.org/licenses/LICENSE-2.0";>Apache + License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton, + Proton, Apache, the Apache feather logo, and the Apache Qpid + project logo are trademarks of The Apache Software + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </div> + </body> +</html> http://git-wip-us.apache.org/repos/asf/qpid-site/blob/0e1f0cc4/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Handling-Undeliverable-Messages.html ---------------------------------------------------------------------- diff --git a/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Handling-Undeliverable-Messages.html b/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Handling-Undeliverable-Messages.html new file mode 100644 index 0000000..3832693 --- /dev/null +++ b/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Handling-Undeliverable-Messages.html @@ -0,0 +1,179 @@ +<!DOCTYPE html> +<!-- + - + - Licensed to the Apache Software Foundation (ASF) under one + - or more contributor license agreements. 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See the License for the + - specific language governing permissions and limitations + - under the License. + - +--> +<html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en"> + <head> + <title>9.4. Handing Undeliverable Messages - Apache Qpid™</title> + <meta http-equiv="X-UA-Compatible" content="IE=edge"/> + <meta name="viewport" content="width=device-width, initial-scale=1.0"/> + <link rel="stylesheet" href="/site.css" type="text/css" async="async"/> + <link rel="stylesheet" href="/deferred.css" type="text/css" defer="defer"/> + <script type="text/javascript">var _deferredFunctions = [];</script> + <script type="text/javascript" src="/deferred.js" defer="defer"></script> + <!--[if lte IE 8]> + <link rel="stylesheet" href="/ie.css" type="text/css"/> + <script type="text/javascript" src="/html5shiv.js"></script> + <![endif]--> + + <!-- Redirects for `go get` and godoc.org --> + <meta name="go-import" + content="qpid.apache.org git https://git-wip-us.apache.org/repos/asf/qpid-proton.git"/> + <meta name="go-source" + content="qpid.apache.org +https://github.com/apache/qpid-proton/blob/go1/README.md +https://github.com/apache/qpid-proton/tree/go1{/dir} +https://github.com/apache/qpid-proton/blob/go1{/dir}/{file}#L{line}"/> + </head> + <body> + <div id="-content"> + <div id="-top" class="panel"> + <a id="-menu-link"><img width="16" height="16" src="" alt="Menu"/></a> + + <a id="-search-link"><img width="22" height="16" src="" alt="Search"/></a> + + <ul id="-global-navigation"> + <li><a id="-logotype" href="/index.html">Apache Qpid<sup>™</sup></a></li> + <li><a href="/documentation.html">Documentation</a></li> + <li><a href="/download.html">Download</a></li> + <li><a href="/discussion.html">Discussion</a></li> + </ul> + </div> + + <div id="-menu" class="panel" style="display: none;"> + <div class="flex"> + <section> + <h3>Project</h3> + + <ul> + <li><a href="/overview.html">Overview</a></li> + <li><a href="/components/index.html">Components</a></li> + <li><a href="/releases/index.html">Releases</a></li> + </ul> + </section> + + <section> + <h3>Messaging APIs</h3> + + <ul> + <li><a href="/proton/index.html">Qpid Proton</a></li> + <li><a href="/components/jms/index.html">Qpid JMS</a></li> + <li><a href="/components/messaging-api/index.html">Qpid Messaging API</a></li> + </ul> + </section> + + <section> + <h3>Servers and tools</h3> + + <ul> + <li><a href="/components/broker-j/index.html">Broker-J</a></li> + <li><a href="/components/cpp-broker/index.html">C++ broker</a></li> + <li><a href="/components/dispatch-router/index.html">Dispatch router</a></li> + </ul> + </section> + + <section> + <h3>Resources</h3> + + <ul> + <li><a href="/dashboard.html">Dashboard</a></li> + <li><a href="https://cwiki.apache.org/confluence/display/qpid/Index";>Wiki</a></li> + <li><a href="/resources.html">More resources</a></li> + </ul> + </section> + </div> + </div> + + <div id="-search" class="panel" style="display: none;"> + <form action="http://www.google.com/search"; method="get"> + <input type="hidden" name="sitesearch" value="qpid.apache.org"/> + <input type="text" name="q" maxlength="255" autofocus="autofocus" tabindex="1"/> + <button type="submit">Search</button> + <a href="/search.html">More ways to search</a> + </form> + </div> + + <div id="-middle" class="panel"> + <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-broker-j-7.0.0/index.html">Qpid Broker-J 7.0.0</a></li><li><a href="/releases/qpid-broker-j-7.0.0/book/index.html">Apache Qpid Broker-J</a></li><li>9.4. Handing Undeliverable Messages</li></ul> + + <div id="-middle-content"> + <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">9.4. Handing Undeliverable Messages</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Runtime-Producer-Transaction-Timeout.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-Close-Connection-When-No-Route.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-Handling-Undeliverable-Messages"></a>9.4. Handing Undeliverable Messages</h2></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Handling-Undeliverable-Messages-Introduction"></a>9.4.1. Introduction</h3></div></div></div><p> Messages that cannot be delivered successfu lly to a consumer (for instance, because the + client is using a transacted session and rolls-back the transaction) can be made available on + the queue again and then subsequently be redelivered, depending on the precise session + acknowledgement mode and messaging model used by the application. This is normally desirable + behaviour that contributes to the ability of a system to withstand unexpected errors. However, it + leaves open the possibility for a message to be repeatedly redelivered (potentially indefinitely), + consuming system resources and preventing the delivery of other messages. Such undeliverable + messages are sometimes known as poison messages.</p><p>For an example, consider a stock ticker application that has been designed to consume prices + contained within JMS TextMessages. What if inadvertently a BytesMessage is placed onto the queue? + As the ticker application does not expect the BytesMessage, its processing might fail and cause it + to roll-back the transaction, however the default behavior of the Broker would mean that the + BytesMessage would be delivered over and over again, preventing the delivery of other legitimate + messages, until an operator intervenes and removes the erroneous message from the queue. </p><p>Qpid has maximum delivery count and dead-letter queue (DLQ) features which can be used in + concert to construct a system that automatically handles such a condition. These features are + described in the following sections.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Handling-Undeliverable-Messages-Maximum-Delivery-Count"></a>9.4.2. Maximum Delivery Count</h3></div></div></div><p> Maximum delivery count is an attribute of a queue. If a consumer application is unable to + process a message more than the specified number of times, then the Broker will either route the + message via the queue's <span class="emphasis"><em>alternate binding</em></span> (if one has been defined), or will + discard the message.</p><p>When using AMQP 1.0 the current delivery count of a message is available to the consuming + application via the<code class="literal">message-count</code> message header (exposed via the + <code class="literal">JMSXDeliveryCount</code> JMS message property when using JMS). When using the + AMQP 0-8..0-10 protocols this information is not available.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p> When using AMQP 0-8..0-10, in order for a maximum delivery count to be enforced, the consuming application + <span class="emphasis"><em>must</em></span> call <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/Session.html#rollback()" target="_top">Session#rollback()</a> (or <a class="link" href="http://docs.oracle.com/javaee/6/api/javax/jms/Session.html#recover()" target="_top">Session#recover()</a> if the session is not transacted). It is during the Broker's + processing of Session#rollback() (or Session#recover()) that if a message has been seen + at least the maximum number of times then it will move the message to the DLQ or discard the + message. If the consuming application fails in another manner, for instance, closes the connection, the + message will not be re-routed and consumer application will see the same poison message again + once it reconnects.</p><p> If the consuming application is using Qpid JMS Client 0-x and using AMQP 0-8, 0-9, or 0-9-1 + protocols, it is necessary to set the client system property <code class="varname">qpid.reject.behaviour</code> or + connection or binding URL option <code class="varname">rejectbehaviour</code> to the value <code class="literal">server</code>.</p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Handling-Undeliverable-Messages-Dead-Letter-Queues"></a>9.4.3. Alternate Binding</h3></div></div></div><p>Once the maximum delivery count is exceeded, if the queue has an <code class="literal">alternateBinding</code> + specified, the Broker automatically routes the message via the alternate binding. The alternate binding + would normally specify a queue designated for that purpose of receiving the undeliverable messages. + By convention such queues are known as dead-letter queues or simply DLQs.</p><div class="caution" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Avoid excessive queue depth</h3><p>Applications making use of DLQs <span class="emphasis"><em>should</em></span> make provision for the frequent + examination of messages arriving on DLQs so that both corrective actions can be taken to resolve + the underlying cause and organise for their timely removal from the DLQ. Messages on DLQs + consume system resources in the same manner as messages on normal queues so excessive queue + depths should not be permitted to develop.</p></div></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Runtime-Producer-Transaction-Timeout.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-Close-Connection-When-No-Route.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">9.3. Producer Transaction Timeout </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%"> 9.5. Closing client connections on unroutable mandatory messages</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks!</a></li> + <li><a href="/security.html">Security</a></li> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2015 + The Apache Software Foundation; Licensed under + the <a href="http://www.apache.org/licenses/LICENSE-2.0";>Apache + License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton, + Proton, Apache, the Apache feather logo, and the Apache Qpid + project logo are trademarks of The Apache Software + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </div> + </body> +</html> http://git-wip-us.apache.org/repos/asf/qpid-site/blob/0e1f0cc4/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Memory.html ---------------------------------------------------------------------- diff --git a/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Memory.html b/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Memory.html new file mode 100644 index 0000000..435c291 --- /dev/null +++ b/content/releases/qpid-broker-j-7.0.0/book/Java-Broker-Runtime-Memory.html @@ -0,0 +1,281 @@ +<!DOCTYPE html> +<!-- + - + - Licensed to the Apache Software Foundation (ASF) under one + - or more contributor license agreements. 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See the License for the + - specific language governing permissions and limitations + - under the License. + - +--> +<html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en"> + <head> + <title>9.11. Memory - Apache Qpid™</title> + <meta http-equiv="X-UA-Compatible" content="IE=edge"/> + <meta name="viewport" content="width=device-width, initial-scale=1.0"/> + <link rel="stylesheet" href="/site.css" type="text/css" async="async"/> + <link rel="stylesheet" href="/deferred.css" type="text/css" defer="defer"/> + <script type="text/javascript">var _deferredFunctions = [];</script> + <script type="text/javascript" src="/deferred.js" defer="defer"></script> + <!--[if lte IE 8]> + <link rel="stylesheet" href="/ie.css" type="text/css"/> + <script type="text/javascript" src="/html5shiv.js"></script> + <![endif]--> + + <!-- Redirects for `go get` and godoc.org --> + <meta name="go-import" + content="qpid.apache.org git https://git-wip-us.apache.org/repos/asf/qpid-proton.git"/> + <meta 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action="http://www.google.com/search"; method="get"> + <input type="hidden" name="sitesearch" value="qpid.apache.org"/> + <input type="text" name="q" maxlength="255" autofocus="autofocus" tabindex="1"/> + <button type="submit">Search</button> + <a href="/search.html">More ways to search</a> + </form> + </div> + + <div id="-middle" class="panel"> + <ul id="-path-navigation"><li><a href="/index.html">Home</a></li><li><a href="/releases/index.html">Releases</a></li><li><a href="/releases/qpid-broker-j-7.0.0/index.html">Qpid Broker-J 7.0.0</a></li><li><a href="/releases/qpid-broker-j-7.0.0/book/index.html">Apache Qpid Broker-J</a></li><li>9.11. Memory</li></ul> + + <div id="-middle-content"> + <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">9.11. Memory</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Runtime-Connection-Limit.html">Prev</a> </td><th align="center" width="60%">Chapter 9. Runtime</th><td align="right" width="20%"> <a accesskey="n" href="Java-Broker-High-Availability.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-Memory"></a>9.11. Memory</h2></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Memory-Introduction"></a>9.11.1. Introduction</h3></div></div></div><p> + Understanding how the Qpid broker uses memory is essential to running a high performing and reliable service. + A wrongly configured broker can exhibit poor performance or even crash with an <code class="literal">OutOfMemoryError</code>. + Unfortunately, memory usage is not a simple topic and thus requires some in depth explanations. + This page should give the required background information to make informed decisions on how to configure your broker. + </p><p> + <a class="xref" href="Java-Broker-Runtime-Memory.html#Java-Broker-Runtime-Memory-Types" title="9.11.2. Types of Memory">Section 9.11.2, “Types of Memory”</a> explains the two different kinds of Java memory most relevant to the broker. + <a class="xref" href="Java-Broker-Runtime-Memory.html#Java-Broker-Runtime-Memory-Usage" title="9.11.3. Memory Usage in the Broker">Section 9.11.3, “Memory Usage in the Broker”</a> goes on to explain which parts of the broker use what kind of memory. + <a class="xref" href="Java-Broker-Runtime-Memory.html#Java-Broker-Runtime-Memory-Low-Memory" title="9.11.4. Low Memory Conditions">Section 9.11.4, “Low Memory Conditions”</a> explains what happens when the system runs low on memory. + <a class="xref" href="Java-Broker-Runtime-Memory.html#Java-Broker-Runtime-Memory-Defaults" title="9.11.5. Defaults">Section 9.11.5, “Defaults”</a> lays out the default settings of the Qpid broker. + Finally, <a class="xref" href="Java-Broker-Runtime-Memory.html#Java-Broker-Runtime-Memory-Tuning" title="9.11.6. Memory Tuning the Broker">Section 9.11.6, “Memory Tuning the Broker”</a> gives some advice on tuning your broker. + </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Memory-Types"></a>9.11.2. Types of Memory</h3></div></div></div><p> + While Java has a couple of different internal memory types we will focus on the two types that are relevant to the Qpid broker. + Both of these memory types are taken from the same physical memory (RAM). + </p><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e6179"></a>9.11.2.1. Heap</h4></div></div></div><p> + Normally, all objects are allocated from Java's heap memory. + Once, nothing references an object it is cleaned up by the Java Garbage Collector and it's memory returned to the heap. + This works fine for most use cases. + However, when interacting with other parts of the operating system using Java's heap is not ideal. + This is where the so called direct memory comes into play. + </p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e6184"></a>9.11.2.2. Direct</h4></div></div></div><p> + The world outside of the JVM, in particular the operating system (OS), does not know about Java heap memory and uses other structures like C arrays. + In order to interact with these systems Java needs to copy data between its own heap memory and these native structures. + This can become a bottle neck when there is a lot of exchange between Java and the OS like in I/O (both disk and network) heavy applications. + Java's solution to this is to allow programmers to request <code class="literal">ByteBuffer</code>s from so called direct memory. + This is an opaque structure that <span class="emphasis"><em>might</em></span> have an underlying implementation that makes it efficient to interact with the OS. + Unfortunately, the GC is not good at tracking direct memory and in general it is inadvisable to use direct memory for regular objects. + </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Memory-Usage"></a>9.11.3. Memory Usage in the Broker</h3></div></div></div><p> + This section lists some note worthy users of memory within the broker and where possible lists their usage of heap and direct memory. + Note that to ensure smooth performance some heap memory should remain unused by the application and be reserved for the JVM to do house keeping and garbage collection. + <a class="link" href="https://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/util/DbCacheSize.html"; target="_top">Some guides</a> advise to reserve up to 30% of heap memory for the JVM. + </p><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e6203"></a>9.11.3.1. Broker</h4></div></div></div><p> + The broker itself uses a moderate amount of heap memory (≈15 MB). + However, each connection and session comes with a heap overhead of about 17 kB and 15 kB respectively. + In addition, each connection reserves 512 kB direct memory for network I/O. + </p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e6208"></a>9.11.3.2. Virtual Hosts</h4></div></div></div><p> + The amount of memory a Virtual Host uses depends on its type. + For a JSON Virtual Host Node with a BDB Virtual Host the heap memory usage is approximately 2 MB. + However, each BDB Virtual Hosts has a mandatory cache in heap memory which has an impact on performance. + See <a class="link" href="Java-Broker-Runtime-Memory.html#Java-Broker-Runtime-Memory-Usage-BDB" title="9.11.3.4. Message Store">below</a> for more information. + </p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e6216"></a>9.11.3.3. Messages</h4></div></div></div><p> + Messages and their headers are kept in direct memory and have an additional overhead of approximately 1 kB heap memory each. + This means that most brokers will want to have more direct memory than heap memory. + When many small messages accumulate on the broker the 1 kB heap memory overhead can become a <a class="link" href="Java-Broker-Runtime-Memory.html#Java-Broker-Runtime-Memory-Low-Memory-Heap" title="9.11.4.1. Low on Heap Memory">limiting factor</a>. + </p><p> + When the broker is <a class="link" href="Java-Broker-Runtime-Memory.html#Java-Broker-Runtime-Memory-Low-Memory-Direct" title="9.11.4.2. Low on Direct Memory">running low on direct memory</a> + it will evict enqueued messages from memory and <a class="link" href="Java-Broker-Runtime-Flow-To-Disk.html" title="9.6. Flow to Disk">flow them to disk</a>. + For persistent messages this only means freeing the direct memory representation because they always have an on-disk representation to guard against unexpected failure (e.g., a power cut). + For transient messages this implies additional disk I/O. + After being flowed to disk messages need to be re-read from disk before delivery. + </p><p>Please, note that messages from uncommitted transactions are not + <a class="link" href="Java-Broker-Runtime-Flow-To-Disk.html" title="9.6. Flow to Disk">flowed to disk</a> as part of + <a class="link" href="Java-Broker-Runtime-Memory.html#Java-Broker-Runtime-Memory-Low-Memory-Direct" title="9.11.4.2. Low on Direct Memory">running into low direct memory conditions</a>, + as they are not enqueued yet. The <code class="literal">Connection</code> has its own threshold for + keeping messages from uncommitted transactions in memory. Only when <code class="literal">Connection</code> threshold + is breached, the uncommitted messages on the connection are + <a class="link" href="Java-Broker-Runtime-Flow-To-Disk.html" title="9.6. Flow to Disk">flowed to disk</a>.</p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Runtime-Memory-Usage-BDB"></a>9.11.3.4. Message Store</h4></div></div></div><div class="section"><div class="titlepage"><div><div><h5 class="title"><a id="d0e6252"></a>Berkeley DB (BDB)</h5></div></div></div><p> + The broker can use Oracle's BDB JE (BDB) as a message store to persist messages by writing them to a database. + BDB uses a mandatory cache for navigating and organising its database structure. + Sizing and tuning this cache is a topic of its own and would go beyond the scope of this guide. + Suffice to say that by default Qpid uses 5% of heap memory for BDB caches (each Virtual Host uses a separate cache) or 10 MB per BDB store, whichever is greater. + See the <a class="link" href="http://www.oracle.com/us/products/database/berkeley-db/je"; target="_top">official webpage</a> especially <a class="link" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/util/DbCacheSize.html"; target="_top">this page</a> for more information. + For those interested, Qpid uses <a class="link" href="http://docs.oracle.com/cd/E17277_02/html/java/com/sleepycat/je/CacheMode.html#EVICT_LN"; target="_top">EVICT_LN</a> as its default JE cacheMode. + </p><p> + Note that due to licensing concerns Qpid does not ship the BDB JE jar files. + </p></div><div class="section"><div class="titlepage"><div><div><h5 class="title"><a id="d0e6268"></a>Derby</h5></div></div></div><p> + TODO + </p></div></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e6273"></a>9.11.3.5. HTTP Management</h4></div></div></div><p> + Qpid uses Jetty for the HTTP Management (both REST and Web Management Console). + When the management plugin is loaded it will allocate the memory it needs and should not require more memory during operation and can thus be largely ignored. + </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Memory-Low-Memory"></a>9.11.4. Low Memory Conditions</h3></div></div></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Runtime-Memory-Low-Memory-Heap"></a>9.11.4.1. Low on Heap Memory</h4></div></div></div><p> + When the broker runs low on heap memory performance will degrade because the JVM will trigger full garbage collection (GC) events in a struggle to free memory. + These full GC events are also called stop-the-world events as they completely halt the execution of the Java application. + Stop-the-world-events may take any where from a couple of milliseconds up to several minutes. + Should the heap memory demands rise even further the JVM will eventually throw an OutOfMemoryError which will cause the broker to shut down. + </p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="Java-Broker-Runtime-Memory-Low-Memory-Direct"></a>9.11.4.2. Low on Direct Memory</h4></div></div></div><p> + When the broker detects that it uses 75% of available direct memory it will start flowing incoming transient messages to disk and reading them back before delivery. + This will prevent the broker from running out of direct memory but may degrade performance by requiring disk I/O. + </p></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Memory-Defaults"></a>9.11.5. Defaults</h3></div></div></div><p> + By default Qpid uses these settings: + </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> + 0.5 GB heap memory + </li><li class="listitem"> + 1.5 GB direct memory + </li><li class="listitem"> + 5% of heap reserved for the BDB JE cache. + </li><li class="listitem"> + Start flow-to-disk at 75% direct memory utilisation. + </li></ul></div><p> + As an example, this would accommodate a broker with 50 connections, each serving 5 sessions, and each session having 1000 messages of 1 kB on queues in the broker. + This means a total of 250 concurrent sessions and a total of 250000 messages without flowing messages to disk. + </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Memory-Tuning"></a>9.11.6. Memory Tuning the Broker</h3></div></div></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e6309"></a>9.11.6.1. Java Tuning</h4></div></div></div><p> + Most of these options are implementation specific. It is assumed you are using Oracle Java 1.8. + </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> + Heap and direct memory can be configured through the <a class="link" href="Java-Broker-Appendix-Environment-Variables.html#Java-Broker-Appendix-Environment-Variables-Qpid-Java-Mem"><code class="literal">QPID_JAVA_MEM</code> environment variable</a>. + </li></ul></div><p> + </p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e6323"></a>9.11.6.2. Qpid Tuning</h4></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> + The system property <code class="literal">qpid.broker.bdbTotalCacheSize</code> sets the total amount of heap memory (in bytes) allocated to BDB caches. + </li><li class="listitem"> + The system property <code class="literal">broker.flowToDiskThreshold</code> sets the threshold (in bytes) for flowing transient messages to disk. + Should the broker use more than direct memory it will flow incoming messages to disk. + Should utilisation fall beneath the threshold it will stop flowing messages to disk. + </li><li class="listitem"> + The system property <code class="literal">connection.maxUncommittedInMemorySize</code> sets the threshold (in bytes) + for total messages sizes (in bytes) from connection uncommitted transactions when messages are hold in memory. + If threshold is exceeded, all messages from connection in-flight transactions are flowed to disk including + those arriving after breaching the threshold. + </li></ul></div></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e6342"></a>9.11.6.3. Formulae</h4></div></div></div><p> + We developed a simple formula which estimates the <span class="emphasis"><em>minimum</em></span> memory usage of the broker under certain usage. + These are rough estimate so we strongly recommend testing your configuration extensively. + Also, if your machine has more memory available by all means use more memory as it can only improve the performance and stability of your broker. + However, remember that both heap and direct memory are served from your computer's physical memory so their sum should never exceed the physically available RAM (minus what other processes use). + </p><p> + </p><div class="informalequation"><span class="mathphrase"> + memory<sub>heap</sub> = 15 MB + 20 kB * N<sub>sessions</sub> + 1.5 kB * N<sub>messages</sub> + 100 kB * N<sub>connections</sub> + </span></div><p> + </p><p> + </p><div class="informalequation"><span class="mathphrase"> + memory<sub>direct</sub> = 2 MB + (200 B + averageSize<sub>msg</sub> *2)* N<sub>messages</sub> + 1MB * N<sub>connections</sub> + </span></div><p> + </p><p> + Where <span class="mathphrase">N</span> denotes the total number of connections/sessions/messages on the broker. Furthermore, for direct memory only the messages that have not been flowed to disk are relevant. + </p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>The formulae assume the worst case in terms of memory usage: persistent messages and TLS connections. Transient messages consume less heap memory than persistent and plain connections consume less direct memory than TLS + connections. + </p></div></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e6394"></a>9.11.6.4. Things to Consider</h4></div></div></div><div class="section"><div class="titlepage"><div><div><h5 class="title"><a id="d0e6397"></a>Performance</h5></div></div></div><p> + Choosing a smaller direct memory size will lower the threshold for flowing transient messages to disk when messages accumulate on a queue. + This can have impact on performance in the transient case where otherwise no disk I/O would be involved. + </p><p> + Having too little heap memory will result in poor performance due to frequent garbage collection events. See <a class="xref" href="Java-Broker-Runtime-Memory.html#Java-Broker-Runtime-Memory-Low-Memory" title="9.11.4. Low Memory Conditions">Section 9.11.4, “Low Memory Conditions”</a> for more details. + </p></div><div class="section"><div class="titlepage"><div><div><h5 class="title"><a id="d0e6406"></a>OutOfMemoryError</h5></div></div></div><p> + Choosing too low heap memory can cause an OutOfMemoryError which will force the broker to shut down. + In this sense the available heap memory puts a hard limit on the number of messages you can have in the broker at the same time. + </p><p> + If the Java runs out of direct memory it also throws a OutOfMemoryError resulting the a broker shutdown. + Under normal circumstances this should not happen but needs to be considered when deviating from the default configuration, especially when changing the flowToDiskThreshold. + </p><p> + If you are sending very large messages you should accommodate for this by making sure you have enough direct memory. + </p></div></div></div></div><div class="navfooter"><hr /><table summary="Navigation footer" width="100%"><tr><td align="left" width="40%"><a accesskey="p" href="Java-Broker-Runtime-Connection-Limit.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-High-Availability.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">9.10. Connection Limits </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%"> Chapter 10. High Availability</td></tr></table></div></div> + + <hr/> + + <ul id="-apache-navigation"> + <li><a href="http://www.apache.org/";>Apache</a></li> + <li><a href="http://www.apache.org/licenses/";>License</a></li> + <li><a href="http://www.apache.org/foundation/sponsorship.html";>Sponsorship</a></li> + <li><a href="http://www.apache.org/foundation/thanks.html";>Thanks!</a></li> + <li><a href="/security.html">Security</a></li> + <li><a href="http://www.apache.org/";><img id="-apache-feather" width="48" height="14" src="" alt="Apache"/></a></li> + </ul> + + <p id="-legal"> + Apache Qpid, Messaging built on AMQP; Copyright © 2015 + The Apache Software Foundation; Licensed under + the <a href="http://www.apache.org/licenses/LICENSE-2.0";>Apache + License, Version 2.0</a>; Apache Qpid, Qpid, Qpid Proton, + Proton, Apache, the Apache feather logo, and the Apache Qpid + project logo are trademarks of The Apache Software + Foundation; All other marks mentioned may be trademarks or + registered trademarks of their respective owners + </p> + </div> + </div> + </div> + </body> +</html> --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@qpid.apache.org For additional commands, e-mail: commits-h...@qpid.apache.org
