content/releases/qpid-broker-j-7.1.9/book/Java-Broker-Runtime-Disk-Space-Management.html - qpid-site - Git at Google

 <!DOCTYPE html>
 <!--
  -
  - 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.
  -
 -->
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
   <head>
     <title>9.2.&#160;Disk Space Management - Apache Qpid&#8482;</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://gitbox.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>&#8482;</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-7.1.9/index.html">Qpid Broker-J 7.1.9</a></li><li><a href="/releases/qpid-broker-j-7.1.9/book/index.html">Apache Qpid Broker-J</a></li><li>9.2.&#160;Disk Space Management</li></ul>

         <div id="-middle-content">
           <div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">9.2.&#160;Disk Space Management</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Runtime.html">Prev</a>&#160;</td><th align="center" width="60%">Chapter&#160;9.&#160;Runtime</th><td align="right" width="20%">&#160;<a accesskey="n" href="Java-Broker-Runtime-Transaction-Timeout.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-Disk-Space-Management"></a>9.2.&#160;Disk Space Management</h2></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Disk-Space-Management-Producer-Flow-Control"></a>9.2.1.&#160;Disk quota-based flow control</h3></div></div></div><p>
         The Apache Qpid Broker-J supports a flow control mechanism which is triggered when a configured
         disk quota is exceeded. 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.&#160;Controlling Queue Size">Section&#160;4.7.5, &#8220;Controlling Queue Size&#8221;</a>.
         </p></div><div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="d0e5882"></a>9.2.1.1.&#160;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>&#160;</td><td align="center" width="20%"><a accesskey="u" href="Java-Broker-Runtime.html">Up</a></td><td align="right" width="40%">&#160;<a accesskey="n" href="Java-Broker-Runtime-Transaction-Timeout.html">Next</a></td></tr><tr><td align="left" valign="top" width="40%">Chapter&#160;9.&#160;Runtime&#160;</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%">&#160;9.3.&#160;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 &#169; 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>
	<!DOCTYPE html>
	<!--
	-
	- 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.
	-
	-->
	<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
	<head>
	<title>9.2. Disk Space Management - 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://gitbox.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-7.1.9/index.html">Qpid Broker-J 7.1.9</a></li><li><a href="/releases/qpid-broker-j-7.1.9/book/index.html">Apache Qpid Broker-J</a></li><li>9.2. Disk Space Management</li></ul>

	<div id="-middle-content">
	<div class="docbook"><div class="navheader"><table summary="Navigation header" width="100%"><tr><th align="center" colspan="3">9.2. Disk Space Management</th></tr><tr><td align="left" width="20%"><a accesskey="p" href="Java-Broker-Runtime.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-Transaction-Timeout.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-Disk-Space-Management"></a>9.2. Disk Space Management</h2></div></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="Java-Broker-Runtime-Disk-Space-Management-Producer-Flow-Control"></a>9.2.1. Disk quota-based flow control</h3></div></div></div><p>
	The Apache Qpid Broker-J supports a flow control mechanism which is triggered when a configured
	disk quota is exceeded. 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="d0e5882"></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-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. 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>