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From "Paul Gale (Confluence)" <conflue...@apache.org>
Subject [CONF] Apache ActiveMQ > Total Ordering
Date Wed, 25 Jan 2017 16:29:35 GMT
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<td class="notification-comment-pattern-container mobile-resize-text" style="padding: 0px;
border-collapse: collapse; padding: 0px"><strong>Change comment:</strong> Fix
formatting.</td> 
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title="Total Ordering" style="color: #3b73af; text-decoration: none">Total Ordering</a></span></td>

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<table class="content-excerpt-pattern" cellspacing="0" cellpadding="0" border="0" width="100%"
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<tbody> 
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<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px;
border-collapse: collapse; padding: 0 0 0 24px"> <p class="diff-block-target diff-block-context"
style="margin: 10px 0 0 0; margin-top: 0">Sometimes it can be useful to ensure that every
topic consumer sees messages arriving on the topic in exactly the same order. Normally <span
class="diff-html-removed" id="removed-diff-1" style="font-size: 100%; background-color: #ffe7e7;
text-decoration: line-through;">we guarrentee </span>the <span class="diff-html-added"
id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">broker will guarantee
the </span>order of all messages sent by the same producer<span class="diff-html-removed"
id="removed-diff-2" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">;
however due to multi-threading </span><span class="diff-html-added" id="added-diff-1"
style="font-size: 100%; background-color: #ddfade;">. However, owing to the broker's use
of multiple threads </span>and asynchronous processing, <span class="diff-html-removed"
id="removed-diff-3" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">the
</span>messages from different producers could arrive in different consumers in different
orders.</p> <p class="diff-block-target diff-block-context" style="margin: 10px 0
0 0"> <span class="diff-html-removed" id="removed-diff-4" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">e.g. </span><span class="diff-html-added"
id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">For example, </span>if
we have <span class="diff-html-removed" id="removed-diff-5" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">producers </span><span class="diff-html-added"
id="added-diff-3" style="font-size: 100%; background-color: #ddfade;">producers&nbsp;</span><strong><code
style="font-family: monospace"><span class="diff-html-changed" id="changed-diff-0" style="background-color:
#d6f0ff;">P</span></code></strong><span class="diff-html-removed"
style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span
class="diff-html-removed" id="removed-diff-6" style="font-size: 100%; background-color: #ffe7e7;
text-decoration: line-through;">and </span><span class="diff-html-added" id="added-diff-4"
style="font-size: 100%; background-color: #ddfade;">and&nbsp;</span><strong><code
style="font-family: monospace"><span class="diff-html-changed" id="changed-diff-1" style="background-color:
#d6f0ff;">Q</span></code></strong><span class="diff-html-changed"
style="background-color: #d6f0ff;"> </span>sending messages such that at about the
same <span class="diff-html-removed" id="removed-diff-7" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">time </span><span class="diff-html-added"
id="added-diff-5" style="font-size: 100%; background-color: #ddfade;">time&nbsp;</span><strong><code
style="font-family: monospace"><span class="diff-html-changed" id="changed-diff-2" style="background-color:
#d6f0ff;">P</span></code></strong><span class="diff-html-changed"
style="background-color: #d6f0ff;"> </span>sends <strong><code style="font-family:
monospace"><span class="diff-html-changed" id="changed-diff-3" style="background-color:
#d6f0ff;">P1</span></code><span class="diff-html-changed" id="changed-diff-4"
style="background-color: #d6f0ff;">, </span><code style="font-family: monospace"><span
class="diff-html-changed" id="changed-diff-5" style="background-color: #d6f0ff;">P2</span></code></strong>,<span
class="diff-html-added" id="added-diff-6" style="font-size: 100%; background-color: #ddfade;">&nbsp;</span><strong><code
style="font-family: monospace"><span class="diff-html-changed" id="changed-diff-6" style="background-color:
#d6f0ff;">P3</span></code></strong><span class="diff-html-removed"
style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span
class="diff-html-removed" id="removed-diff-8" style="font-size: 100%; background-color: #ffe7e7;
text-decoration: line-through;">and </span><span class="diff-html-added" id="added-diff-7"
style="font-size: 100%; background-color: #ddfade;">and&nbsp;</span><strong><code
style="font-family: monospace"><span class="diff-html-changed" id="changed-diff-7" style="background-color:
#d6f0ff;">Q</span></code></strong><span class="diff-html-changed"
style="background-color: #d6f0ff;"> </span>sends <strong><code style="font-family:
monospace"><span class="diff-html-changed" id="changed-diff-8" style="background-color:
#d6f0ff;">Q1</span></code><span class="diff-html-changed" id="changed-diff-9"
style="background-color: #d6f0ff;">, </span><code style="font-family: monospace"><span
class="diff-html-changed" id="changed-diff-10" style="background-color: #d6f0ff;">Q2</span></code></strong>.
<span class="diff-html-removed" id="removed-diff-9" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">Then 2 different consumeres </span><span
class="diff-html-added" id="added-diff-8" style="font-size: 100%; background-color: #ddfade;">Therefore,
two different consumers </span><em><span class="diff-html-changed" id="changed-diff-11"
style="background-color: #d6f0ff;">could</span></em><span class="diff-html-changed"
style="background-color: #d6f0ff;"> </span>see messages arrive in <span class="diff-html-removed"
id="removed-diff-10" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">this
order...</span><span class="diff-html-added" id="added-diff-9" style="font-size:
100%; background-color: #ddfade;">the following order:</span> </p> 
<table class="diff-macro diff-block-target diff-block-context" style="background-color:
#f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;; border-collapse:
collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333"> 
<thead> 
<tr> 
<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight:
normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color:
;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB/5982/f2b47fb3d636c8bc9fd0b11c0ec6d0ae18646be7.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code"
style="padding-right: 5px; vertical-align: text-bottom;"> </span>Code Block</th>

</tr> 
</thead> 
<tbody> 
<tr> 
<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding:
10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top:
0">
<span class="diff-html-removed" id="removed-diff-11" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">
</span>consumer1: P1 P2 Q1 P3 Q2
consumer2: P1 Q1 Q2 P2 P3
</pre> </td> 
</tr> 
</tbody> 
</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0
0"> <span class="diff-html-removed" id="removed-diff-12" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">i.e. each producers messages are in order; but
</span><span class="diff-html-added" id="added-diff-10" style="font-size: 100%; background-color:
#ddfade;">In this example each producer's message's are in self-relative order. However,
</span>the streams of messages across producers can get intermixed.</p> <p
class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <em>Total
<span class="diff-html-removed" id="removed-diff-13" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">ordering</span><span class="diff-html-added"
id="added-diff-11" style="font-size: 100%; background-color: #ddfade;">Ordering</span></em><span
class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> </span>of
a destination in ActiveMQ ensures that each consumer will see the same total order on that
topic. This has a <span class="diff-html-removed" id="removed-diff-14" style="font-size:
100%; background-color: #ffe7e7; text-decoration: line-through;">peformance </span><span
class="diff-html-added" id="added-diff-12" style="font-size: 100%; background-color: #ddfade;">performance
</span>cost, since <span class="diff-html-removed" id="removed-diff-15" style="font-size:
100%; background-color: #ffe7e7; text-decoration: line-through;">more </span><span
class="diff-html-added" id="added-diff-13" style="font-size: 100%; background-color: #ddfade;">greater
</span>synchronization is required<span class="diff-html-removed" id="removed-diff-16"
style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">, but
</span><span class="diff-html-added" id="added-diff-14" style="font-size: 100%; background-color:
#ddfade;">. This </span>can be useful<span class="diff-html-removed" style="font-size:
100%; background-color: #ffe7e7; text-decoration: line-through;"> </span><span
class="diff-html-removed" id="removed-diff-17" style="font-size: 100%; background-color: #ffe7e7;
text-decoration: line-through;">- e.g. particularly in times when you want to implement
</span><span class="diff-html-added" id="added-diff-15" style="font-size: 100%; background-color:
#ddfade;">, particularly when </span>very fast optimistic transactions <span class="diff-html-added"
id="added-diff-16" style="font-size: 100%; background-color: #ddfade;">are required</span>.
With total ordering the messages would arrive like this<span class="diff-html-removed"
id="removed-diff-18" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">...</span><span
class="diff-html-added" id="added-diff-17" style="font-size: 100%; background-color: #ddfade;">:</span>
</p> 
<table class="diff-macro diff-block-target diff-block-context" style="background-color:
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<thead> 
<tr> 
<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight:
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;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB/5982/f2b47fb3d636c8bc9fd0b11c0ec6d0ae18646be7.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code"
style="padding-right: 5px; vertical-align: text-bottom;"> </span>Code Block</th>

</tr> 
</thead> 
<tbody> 
<tr> 
<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding:
10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top:
0">
<span class="diff-html-removed" id="removed-diff-19" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">
</span>consumer1: P1 P2 Q1 P3 Q2
consumer2: P1 P2 Q1 P3 Q2
</pre> </td> 
</tr> 
</tbody> 
</table> <h2 id="TotalOrdering-ConfiguringTotalOrdering" class="diff-block-context"
style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin:
40px 0 0 0">Configuring Total Ordering</h2> <p class="diff-block-target diff-block-context"
style="margin: 10px 0 0 0">Enable <span class="diff-html-removed" id="removed-diff-20"
style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">the
</span><span class="diff-html-added" id="added-diff-18" style="font-size: 100%; background-color:
#ddfade;">the&nbsp;</span><strong><code style="font-family: monospace"><span
class="diff-html-changed" id="changed-diff-12" style="background-color: #d6f0ff;">&lt;strictOrderDispatchPolicy/&gt;</span></code></strong><span
class="diff-html-changed" style="background-color: #d6f0ff;"> </span>on the <a
href="/confluence/pages/viewpage.action?pageId=35854" style="color: #3b73af; text-decoration:
none">Per Destination Policies</a>. Here's an example</p> 
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solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;; border-collapse: collapse;
mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333"> 
<thead> 
<tr> 
<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight:
normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color:
;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB/5982/f2b47fb3d636c8bc9fd0b11c0ec6d0ae18646be7.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code"
style="padding-right: 5px; vertical-align: text-bottom;"> </span>Code Block</th>

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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding:
10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top:
0">
<span class="diff-html-removed" id="removed-diff-21" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">
    </span>&lt;destinationPolicy&gt;
  <span class="diff-html-removed" id="removed-diff-22" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">    </span>&lt;policyMap&gt;
    <span class="diff-html-removed" id="removed-diff-23" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">    </span>&lt;policyEntries&gt;
      <span class="diff-html-removed" id="removed-diff-24" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">    </span>&lt;policyEntry topic="&gt;"&gt;
        <span class="diff-html-removed" id="removed-diff-25" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">    </span>&lt;dispatchPolicy&gt;
          <span class="diff-html-removed" id="removed-diff-26" style="font-size: 100%;
background-color: #ffe7e7; text-decoration: line-through;">    </span>&lt;strictOrderDispatchPolicy<span
class="diff-html-removed" id="removed-diff-27" style="font-size: 100%; background-color: #ffe7e7;
text-decoration: line-through;"> </span>/&gt;
        <span class="diff-html-removed" id="removed-diff-28" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">    </span>&lt;/dispatchPolicy&gt;
      <span class="diff-html-removed" id="removed-diff-29" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">    </span>&lt;/policyEntry&gt;
  <span class="diff-html-added" id="added-diff-19" style="font-size: 100%; background-color:
#ddfade;">&lt;/policyEntries&gt;</span>
 <span class="diff-html-removed" id="removed-diff-30" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">  </span>&lt;/<span class="diff-html-removed"
id="removed-diff-31" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">policyEntries&gt;&lt;/</span>policyMap&gt;
<span class="diff-html-removed" id="removed-diff-32" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">    </span>&lt;/destinationPolicy&gt;
</pre> </td> 
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