main.pageCache per-destination-policies.html

buildbot Fri, 25 Aug 2017 02:24:08 -0700

Author: buildbot
Date: Fri Aug 25 09:23:43 2017
New Revision: 1017267

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
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     Apache ActiveMQ &#8482; -- Per Destination Policies
@@ -80,8 +71,7 @@
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-<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>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 the 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="conflue
 nceTd"><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 
colspan="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.ResourceAllocationExc
 eption</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>slowConsumerStrategy</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>storeUsageHighWat
 erMark</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><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 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>allConsumersExclusiveByDefault</code></p></td><td 
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td 
colspan="1" rowspan="1" 
class="confluenceTd"><p>When&#160;<strong><code>true</code></strong> all 
consumers will be exclusive. See <a shape="rect" 
href="nms/activemq-exclusive-consumers.html">
 ActiveMQ Exclusive Consumers</a></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>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></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"><pre>maxExpirePageSize</pre></td><td colspan="1" 
rowspan="1" class="confluenceTd"><pre>400</pre></td><td colspan="1" rowspan="1" 
class="confluenceTd"><p>The maximum number of messages to page in when 
periodically expiring messages.</p><p>Messages are paged in according to this 
setting if the number of messages in memory pending dispatch is less than t
 his value, and there are messages in the store to page in. Messages are 
expired during this paging step as they are brought into memory from the 
store.</p><p>Once the paging process is completed, messages are expired from 
the list of those that are in memory and pending dispatch, then from the list 
of those that are in memory but not yet targeted at a 
subscription.</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 t
 ime, 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>advisoryForDis
 cardingMessages</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><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 to 
the&#160;<strong><code>&lt;systemUsage&gt;/&lt;memoryUsage&gt;</code></strong> 
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><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 al
 l 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</co
 de></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>
 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"; 
+<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>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 the 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="conflue
 nceTd"><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 
colspan="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.ResourceAllocationExc
 eption</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>slowConsumerStrategy</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>storeUsageHighWat
 erMark</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><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 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>allConsumersExclusiveByDefault</code></p></td><td 
colspan="1" rowspan="1" class="confluenceTd"><p><code>false</code></p></td><td 
colspan="1" rowspan="1" 
class="confluenceTd"><p>When&#160;<strong><code>true</code></strong> all 
consumers will be exclusive. See <a shape="rect" 
href="nms/activemq-exclusive-consumers.html">
 ActiveMQ Exclusive Consumers</a></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>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></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"><pre>maxExpirePageSize</pre></td><td colspan="1" 
rowspan="1" class="confluenceTd"><pre>400</pre></td><td colspan="1" rowspan="1" 
class="confluenceTd"><p>The maximum number of messages to page in when 
periodically expiring messages.</p><p>Messages are paged in according to this 
setting if the number of messages in memory pending dispatch is less than t
 his value, and there are messages in the store to page in. Messages are 
expired during this paging step as they are brought into memory from the 
store.</p><p>Once the paging process is completed, messages are expired from 
the list of those that are in memory and pending dispatch, then from the list 
of those that are in memory but not yet targeted at a 
subscription.</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 t
 ime, 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>advisoryForDis
 cardingMessages</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><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 to 
the&#160;<strong><code>&lt;systemUsage&gt;/&lt;memoryUsage&gt;</code></strong> 
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><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 al
 l 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</co
 de></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>
 of this in use:</p><parameter ac:name="language">xml</parameter><parameter 
ac:name="linenumbers">true</parameter><plain-text-body>&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";
        xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
@@ -132,8 +122,7 @@
       &lt;/policyMap&gt;
     &lt;/destinationPolicy&gt;
   &lt;/broker&gt;
-&lt;/beans&gt;</pre>
-</div></div></div>
+&lt;/beans&gt;</plain-text-body></div>
         </td>
         <td valign="top">
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