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From build...@apache.org
Subject svn commit: r997062 - in /websites/production/activemq/content: cache/main.pageCache per-destination-policies.html
Date Fri, 09 Sep 2016 21:22:17 GMT
Author: buildbot
Date: Fri Sep  9 21:22:16 2016
New Revision: 997062

Log:
Production update by buildbot for activemq

Modified:
    websites/production/activemq/content/cache/main.pageCache
    websites/production/activemq/content/per-destination-policies.html

Modified: websites/production/activemq/content/cache/main.pageCache
==============================================================================
Binary files - no diff available.

Modified: websites/production/activemq/content/per-destination-policies.html
==============================================================================
--- websites/production/activemq/content/per-destination-policies.html (original)
+++ websites/production/activemq/content/per-destination-policies.html Fri Sep  9 21:22:16
2016
@@ -81,7 +81,7 @@
   <tbody>
         <tr>
         <td valign="top" width="100%">
-<div class="wiki-content maincontent"><p>We support a number of different policies
which can be attached to individual destinations (queues, topics) or to wildcards of queue/topic
hierarchies. This makes it easy to configure how different regions of the JMS destination
space are handled.</p><p>The properties you can set on a Destination are as follows:</p><div
class="table-wrap"><table class="confluenceTable"><tbody><tr><th colspan="1"
rowspan="1" class="confluenceTh"><p>Common Property</p></th><th colspan="1"
rowspan="1" class="confluenceTh"><p>Default Value</p></th><th colspan="1"
rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryForConsumed</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message when a message
is consumed by a client.</p></td></tr><tr><td colspan="1" rowspan="1"
class="c
 onfluenceTd"><p><code>advisoryForDelivery</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message when a message
is sent to a client.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><code>advisoryForFastProducers</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message if a producer
is deemed fast.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryForSlowConsumers</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message if a consumer
is deemed slow.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryWhenFull</code></p></td><td
colspan="1" rowspan="1" class="conf
 luenceTd"><p><code>false</code></p></td><td colspan="1"
rowspan="1" class="confluenceTd"><p>Send an advisory message when a limit (memory,
store, temp disk) is full.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><code>cursorMemoryHighWaterMark</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>70</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The percentage (%) threshold applied
either to the&#160;<strong><code>&lt;systemUsage&gt;/&lt;memoryUsage&gt;</code></strong>
or the destination's&#160;<strong><code>memoryLimit</code></strong>
(when defined) which when exceeded will cause the destination's cursor to either block or
write to disk.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>enableAudit</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>When&#160;<strong><code>true</code></strong>
the broker 
 will track duplicate messages. Duplicates can happen for non-persistent messages during failover.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>gcInactiveDestinations</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Garbage collect inactive destinations.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>inactiveTimoutBeforeGC</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>5000</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The timeout (in ms) after which a
destination is considered inactive.</p></td></tr><tr><td colspan="1"
rowspan="1" class="confluenceTd"><p><code>includeBodyForAdvisory</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Includes the body of the original
message that triggered th
 e advisory as part of the&#160;<strong><code>dataStructure</code></strong>
field in the advisory message (where applicable). Normally the message body is cleared.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>maxBrowsePageSize</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>400</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The maximum number of messages to
page in from the store at one time for a browser.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>maxDestinations</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>-1</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>(v5.12) If&#160;<strong><code>0</code></strong>
or greater, sets the maximum number of destinations that can be created. This parameter is
intended to limit the number of hierarchical destinations that can be created under a wildcard
destination.</p></td></tr><tr><td colspan="1"
  rowspan="1" class="confluenceTd"><p><code>maxPageSize</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>200</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The maximum number of messages to
page in from the store at one time. Increase this value to improve performance for queue destination's
that contain grouped messages that are consumed by multiple concurrent consumers.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>memoryLimit</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The memory limit (in bytes) of the
destination's cursor.</p><p>This memory limit is subordinate to the system level
memory limit, as specified by the&#160;<a shape="rect" href="producer-flow-control.html"><code>&lt;systemUsage&gt;/&lt;memoryUsage&gt;</code></a>
<span class="confluence-link">attribute</span>. There is no default for this value;
it
  simply acts as a child to the overall broker memory until the broker memory is exhausted.</p><p><strong>Note</strong>:
when this limit is specified the destination's&#160;<strong><code>cursorMemoryHighWaterMark</code></strong>
will be applied against it and not the&#160;<strong><code>&lt;systemUsage&gt;/&gt;&lt;memoryUsage&gt;</code></strong>
memory limit.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>minimumMessageSize</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>1024</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>For non-serialized messages (embedded
broker) - the assumed size of the message used for memory usage calculation. Serialized messages
use the serialized size as the basis for the memory calculation.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>prioritizedMessages</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colsp
 an="1" rowspan="1" class="confluenceTd"><p>Persist message priority information.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>producerFlowControl</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>If <strong><code>true</code></strong>
the broker will throttle (flow-control) the producer. Throttling is achieved either by withholding
the producer's ACK or by raising a&#160;<strong><code>javax.jms.ResourceAllocationException</code></strong>
(that's propagated back to the client) when local resources e.g., memory and/or storage, have
been exhausted.</p><p>If&#160;<strong><code>false</code></strong>
excess messages will be written to the message store to prevent memory exhaustion. However,
when the message store reaches capacity the producer will be throttled until resources are
freed.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>slowCo
 nsumerStrategy</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>null</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the strategy for handling slow
consumers. See <a shape="rect" class="external-link" href="http://svn.apache.org/repos/asf/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/policy/AbortSlowConsumerStrategy.java">abortSlowConsumerStrategy.</a></p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>storeUsageHighWaterMark</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>100</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The percentage (%) threshold of the&#160;<strong><code>&lt;systemUsage&gt;/&lt;storeUsage&gt;</code></strong>
store limit which when exceeded causes a send to block.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>useCache</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><co
 de>true</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>If&#160;<strong><code>true</code></strong>
persistent messages are cached for fast retrieval from store.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><span><code>usePrefetchExtension</code><br
clear="none"></span></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The prefetch extension is used when
a&#160;message is delivered but not ACK'ed, such that the broker can dispatch&#160;another
message, e.g., <code>prefetch == 0</code>, the idea being that there will always
be prefetch number of messages pending. It also allows a transaction batch to exceed the prefetch&#160;value.</p></td></tr></tbody></table></div><p>Additional
properties for a Queue</p><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th
colspan="1" rowspan="1" class="confluenceTh"><p>Queue Only Property</p></th><th
col
 span="1" rowspan="1" class="confluenceTh"><p>Default Value</p></th><th
colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>consumersBeforeDispatchStarts</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>0</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>When the first consumer connects,
wait for specified number of consumers before message dispatching starts.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>expireMessagesPeriod</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>30000</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The period (in ms) of checks for
message expiry on queued messages, value of 0 disables.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>lazyDispatch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></t
 d><td colspan="1" rowspan="1" class="confluenceTd"><p>Only page in from store
the number of messages that can be dispatched at time.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>optimizedDispatch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Don't use a separate thread for dispatching
from a Queue.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>persistJMSRedelivered</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>(v 5.10) If true, before a persistent
message is dispatched by the broker for the first time, the message is rewritten to reflect
the possible delivery.</p><p>This ensures the message&#160;<strong><code>JMSRedelivered</code></strong>
header is a reliable indication of possible duplicate delivery.</p></td></tr><tr><td
colsp
 an="1" rowspan="1" class="confluenceTd"><p><code>queuePrefetch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the prefetch for consumers that
are using the default value.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><code>strictOrderDispatch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>If&#160;<strong><code>true</code></strong>
queue will not round robin consumers, but it'll use a single one until its prefetch buffer
is full.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>timeBeforeDispatchStarts</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>0</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>When the first consumer connects,
wait for specified time (in ms) before message dispatching start
 s.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>useConsumerPriority</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Use the priority of a consumer when
dispatching messages from a Queue.</p></td></tr></tbody></table></div><p>Additional
properties for a Topic</p><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th
colspan="1" rowspan="1" class="confluenceTh"><p>Topic Only Property</p></th><th
colspan="1" rowspan="1" class="confluenceTh"><p>Default Value</p></th><th
colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryForDiscardingMessages</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory when a message is
discarded from a non durable subscript
 ion.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><span
style="color: rgb(0,0,0);"><code>alwaysRetroactive</code><br clear="none"></span></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Makes all subscribers retroactive
negating the need to modify the clients to enable this feature.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>durableTopicPrefetch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the prefetch for durable topic
consumers that are using the default value.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><span style="color: rgb(0,0,0);"><code>expireMessagesPeriod</code><br
clear="none"></span></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>30000</code></p></td><td
colspan="1" rowspan="1" cla
 ss="confluenceTd"><p>The interval (in ms) between message expiration checks on inactive
durable subscribers.</p><p><strong>Note</strong>: set to <strong><code>0</code></strong>
to disable message expiration checking.</p></td></tr><tr><td colspan="1"
rowspan="1" class="confluenceTd"><p><code>topicPrefetch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the prefetch for topic consumers
that are using the default value.</p></td></tr></tbody></table></div><p><span
style="line-height: 1.4285715;">The following are examples of different policies that can
be customized on a per destination basis:</span></p><ul><li><a
shape="rect" href="dispatch-policies.html">Dispatch Policies</a></li></ul><p>Here
is an <a shape="rect" class="external-link" href="http://svn.apache.org/repos/asf/activemq/trunk/activemq-unit-tests/src/test/resources/org/apache/activemq/xbean/activemq-policy.xml">example</a>
o
 f this in use:</p><div class="code panel pdl" style="border-width: 1px;"><div
class="codeContent panelContent pdl">
+<div class="wiki-content maincontent"><p>We support a number of different policies
which can be attached to individual destinations (queues, topics) or to wildcards of queue/topic
hierarchies. This makes it easy to configure how different regions of the JMS destination
space are handled.</p><p>The properties you can set on a Destination are as follows:</p><div
class="table-wrap"><table class="confluenceTable"><tbody><tr><th colspan="1"
rowspan="1" class="confluenceTh"><p>Common Property</p></th><th colspan="1"
rowspan="1" class="confluenceTh"><p>Default Value</p></th><th colspan="1"
rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryForConsumed</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message when a message
is consumed by a client.</p></td></tr><tr><td colspan="1" rowspan="1"
class="c
 onfluenceTd"><p><code>advisoryForDelivery</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message when a message
is sent to a client.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><code>advisoryForFastProducers</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message if a producer
is deemed fast.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryForSlowConsumers</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory message if a consumer
is deemed slow.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryWhenFull</code></p></td><td
colspan="1" rowspan="1" class="conf
 luenceTd"><p><code>false</code></p></td><td colspan="1"
rowspan="1" class="confluenceTd"><p>Send an advisory message when a limit (memory,
store, temp disk) is full.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><code>cursorMemoryHighWaterMark</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>70</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The percentage (%) threshold applied
either to the&#160;<strong><code>&lt;systemUsage&gt;/&lt;memoryUsage&gt;</code></strong>
or the destination's&#160;<strong><code>memoryLimit</code></strong>
(when defined) which when exceeded will cause the destination's cursor to either block or
write to disk.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>enableAudit</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>When&#160;<strong><code>true</code></strong>
the broker 
 will track duplicate messages. Duplicates can happen for non-persistent messages during failover.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>gcInactiveDestinations</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Garbage collect inactive destinations.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>inactiveTimoutBeforeGC</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>5000</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The timeout (in ms) after which a
destination is considered inactive.</p></td></tr><tr><td colspan="1"
rowspan="1" class="confluenceTd"><p><code>includeBodyForAdvisory</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Includes the body of the original
message that triggered th
 e advisory as part of the&#160;<strong><code>dataStructure</code></strong>
field in the advisory message (where applicable). Normally the message body is cleared.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>maxBrowsePageSize</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>400</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The maximum number of messages to
page in from the store at one time for a browser.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>maxDestinations</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>-1</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>(v5.12) If&#160;<strong><code>0</code></strong>
or greater, sets the maximum number of destinations that can be created. This parameter is
intended to limit the number of hierarchical destinations that can be created under a wildcard
destination.</p></td></tr><tr><td colspan="1"
  rowspan="1" class="confluenceTd"><p><code>maxPageSize</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>200</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The maximum number of messages to
page in from the store at one time. Increase this value to improve performance for queue destination's
that contain grouped messages that are consumed by multiple concurrent consumers.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>memoryLimit</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The memory limit (in bytes) of the
destination's cursor.</p><p>This memory limit is subordinate to the system level
memory limit, as specified by the&#160;<a shape="rect" href="producer-flow-control.html"><code>&lt;systemUsage&gt;/&lt;memoryUsage&gt;</code></a>
<span class="confluence-link">attribute</span>. There is no default for this value;
it
  simply acts as a child to the overall broker memory until the broker memory is exhausted.</p><p><strong>Note</strong>:
when this limit is specified the destination's&#160;<strong><code>cursorMemoryHighWaterMark</code></strong>
will be applied against it and not the&#160;<strong><code>&lt;systemUsage&gt;/&gt;&lt;memoryUsage&gt;</code></strong>
memory limit.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>minimumMessageSize</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>1024</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>For non-serialized messages (embedded
broker) - the assumed size of the message used for memory usage calculation. Serialized messages
use the serialized size as the basis for the memory calculation.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>prioritizedMessages</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colsp
 an="1" rowspan="1" class="confluenceTd"><p>Persist message priority information.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>producerFlowControl</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>If <strong><code>true</code></strong>
the broker will throttle (flow-control) the producer. Throttling is achieved either by withholding
the producer's ACK or by raising a&#160;<strong><code>javax.jms.ResourceAllocationException</code></strong>
(that's propagated back to the client) when local resources e.g., memory and/or storage, have
been exhausted.</p><p>If&#160;<strong><code>false</code></strong>
excess messages will be written to the message store to prevent memory exhaustion. However,
when the message store reaches capacity the producer will be throttled until resources are
freed.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>slowCo
 nsumerStrategy</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>null</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the strategy for handling slow
consumers. See <a shape="rect" class="external-link" href="https://github.com/apache/activemq/blob/master/activemq-broker/src/main/java/org/apache/activemq/broker/region/policy/AbortSlowConsumerStrategy.java"
rel="nofollow">AbortSlowConsumerStrategy.</a></p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>storeUsageHighWaterMark</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>100</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The percentage (%) threshold of the&#160;<strong><code>&lt;systemUsage&gt;/&lt;storeUsage&gt;</code></strong>
store limit which when exceeded causes a send to block.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>useCache</code></p></td><td
colspan="1" rowspan="1" class="con
 fluenceTd"><p><code>true</code></p></td><td colspan="1"
rowspan="1" class="confluenceTd"><p>If&#160;<strong><code>true</code></strong>
persistent messages are cached for fast retrieval from store.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><span><code>usePrefetchExtension</code><br
clear="none"></span></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The prefetch extension is used when
a&#160;message is delivered but not ACK'ed, such that the broker can dispatch&#160;another
message, e.g., <code>prefetch == 0</code>, the idea being that there will always
be prefetch number of messages pending. It also allows a transaction batch to exceed the prefetch&#160;value.</p></td></tr></tbody></table></div><p>Additional
properties for a Queue</p><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th
colspan="1" rowspan="1" class="confluenceTh"><p>Queue Only Propert
 y</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Default
Value</p></th><th colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>consumersBeforeDispatchStarts</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>0</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>When the first consumer connects,
wait for specified number of consumers before message dispatching starts.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>expireMessagesPeriod</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>30000</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>The period (in ms) of checks for
message expiry on queued messages, value of 0 disables.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>lazyDispatch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>fa
 lse</code></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p>Only
page in from store the number of messages that can be dispatched at time.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>optimizedDispatch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Don't use a separate thread for dispatching
from a Queue.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>persistJMSRedelivered</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>(v 5.10) If true, before a persistent
message is dispatched by the broker for the first time, the message is rewritten to reflect
the possible delivery.</p><p>This ensures the message&#160;<strong><code>JMSRedelivered</code></strong>
header is a reliable indication of possible duplicate delivery.</p></td><
 /tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>queuePrefetch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the prefetch for consumers that
are using the default value.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><code>strictOrderDispatch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>If&#160;<strong><code>true</code></strong>
queue will not round robin consumers, but it'll use a single one until its prefetch buffer
is full.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>timeBeforeDispatchStarts</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>0</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>When the first consumer connects,
wait for specified time (in ms) before message 
 dispatching starts.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><code>useConsumerPriority</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>true</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Use the priority of a consumer when
dispatching messages from a Queue.</p></td></tr></tbody></table></div><p>Additional
properties for a Topic</p><div class="table-wrap"><table class="confluenceTable"><tbody><tr><th
colspan="1" rowspan="1" class="confluenceTh"><p>Topic Only Property</p></th><th
colspan="1" rowspan="1" class="confluenceTh"><p>Default Value</p></th><th
colspan="1" rowspan="1" class="confluenceTh"><p>Description</p></th></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>advisoryForDiscardingMessages</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Send an advisory when a message is
discarded from a non 
 durable subscription.</p></td></tr><tr><td colspan="1" rowspan="1"
class="confluenceTd"><p><span style="color: rgb(0,0,0);"><code>alwaysRetroactive</code><br
clear="none"></span></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Makes all subscribers retroactive
negating the need to modify the clients to enable this feature.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>durableTopicPrefetch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the prefetch for durable topic
consumers that are using the default value.</p></td></tr><tr><td
colspan="1" rowspan="1" class="confluenceTd"><p><span style="color: rgb(0,0,0);"><code>expireMessagesPeriod</code><br
clear="none"></span></p></td><td colspan="1" rowspan="1" class="confluenceTd"><p><code>30000</code></p></td><td
colspan="1
 " rowspan="1" class="confluenceTd"><p>The interval (in ms) between message expiration
checks on inactive durable subscribers.</p><p><strong>Note</strong>:
set to <strong><code>0</code></strong> to disable message expiration
checking.</p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p><code>topicPrefetch</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p><code>n/a</code></p></td><td
colspan="1" rowspan="1" class="confluenceTd"><p>Sets the prefetch for topic consumers
that are using the default value.</p></td></tr></tbody></table></div><p><span
style="line-height: 1.4285715;">The following are examples of different policies that can
be customized on a per destination basis:</span></p><ul><li><a
shape="rect" href="dispatch-policies.html">Dispatch Policies</a></li></ul><p>Here
is an <a shape="rect" class="external-link" href="http://svn.apache.org/repos/asf/activemq/trunk/activemq-unit-tests/src/test/resources/org/apache/activemq/xbean/activemq-policy.x
 ml">example</a> of this in use:</p><div class="code panel pdl" style="border-width:
1px;"><div class="codeContent panelContent pdl">
 <pre class="brush: xml; gutter: true; theme: Default" style="font-size:12px;">&lt;beans
xmlns="http://www.springframework.org/schema/beans" 
        xmlns:amq="http://activemq.apache.org/schema/core"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"



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