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From conflue...@apache.org
Subject [CONF] Apache Qpid: FAQ (page edited)
Date Sat, 17 Jan 2009 01:09:00 GMT
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<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/qpid">qpid</a>
:
            <a href="http://cwiki.apache.org/confluence/display/qpid/FAQ">FAQ</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/qpid/FAQ">FAQ</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~cctrieloff">Carl
Trieloff</a>
            <span class="smallfont">(Jan 16, 2009)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=107647&originalVersion=9&revisedVersion=10">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><div>
<ul>
  <li><a href='#FAQ-FAQ'>FAQ</a>
<ul>
  <li><a href='#FAQ-AboutAMQP'>About AMQP</a>
<ul>
  <li><a href='#FAQ-WhatisAMQP%3F'>What is AMQP?</a></li>
  <li><a href='#FAQ-WheredidAMQPcomefrom'>Where did AMQP come from</a></li>
  <li><a href='#FAQ-WhyuseAMQP%3F'>Why use AMQP?</a></li>
</ul></li>
  <li><a href='#FAQ-Qpid%26AMQP'>Qpid &amp; AMQP</a>
<ul>
  <li><a href='#FAQ-IsQpidAMQPCompliant%3F'>Is Qpid AMQP Compliant?</a></li>
  <li><a href='#FAQ-WhatClientsupportdoesQpidhave%3F'>What Client support does
Qpid have?</a></li>
</ul></li>
  <li><a href='#FAQ-WhatmessagingtopologiesaresupportedbyAMQPandQpid%3F'>What
messaging topologies are supported by AMQP and Qpid?</a></li>
  <li><a href='#FAQ-Performance'>Performance</a>
<ul>
  <li><a href='#FAQ-DoesQpidPerform%28Latency%2FThroughput%29%3F'>Does Qpid Perform
(Latency/Throughput)?</a></li>
</ul></li>
</ul></li>
  <li><a href='#FAQ-HowTo'>How To</a>
<ul>
  <li>
<ul>
  <li><a href='#FAQ-HowtouseRDMAwithQpid'>How to use RDMA with Qpid</a></li>
  <li><a href='#FAQ-MessageTTL%2Cautoexpire'>Message TTL, auto expire</a></li>
  <li><a href='#FAQ-Howtoinstalltheqpidtoolsforcbooker%3F'>How to install the
qpid-tools for c++ booker?</a></li>
</ul></li>
</ul></li>
</ul></div>


<p><b>This page is a collection of FAQ and How to-s for Qpid. If you have a question,
post it to the users list and we will place the answer here to build out our FAQ/ How to.</b></p>

<h1><a name="FAQ-FAQ"></a>FAQ</h1>

<h2><a name="FAQ-AboutAMQP"></a>About AMQP</h2>

<h3><a name="FAQ-WhatisAMQP%3F"></a>What is AMQP?</h3>

<p>AMQP is a wire-level protocol and model for high performance enterprise messaging.</p>

<p><span class="nobr"><a href="http://www.amqp.org" title="Visit page outside
Confluence" rel="nofollow">From the AMQP website:<sup><img class="rendericon"
src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt=""
border="0"/></sup></a></span></p>

<p> AMQP is an Open Standard for Messaging Middleware.</p>

<p> By complying to the AMQP standard, middleware products written for different platforms
and in different languages can send messages to one another. AMQP addresses the problem of
transporting value-bearing messages across and between organizations in a timely manner.</p>

<p> AMQP enables complete interoperability for messaging middleware; both the networking
protocol and the semantics of broker services are defined in AMQP.</p>

<h3><a name="FAQ-WheredidAMQPcomefrom"></a>Where did AMQP come from</h3>

<p>AMQP was born out from Frustration by John O'Hara at JPMC. He started a project internally
to create commodity messaging that was easy to use. Carl Trieloff from Red Hat had started
a project to build messaging for both users and for use in infrastructure, while looking around
spoke to John about his work. Out of these discussion was born the AMQP working Group with
6 initial members, under an agreement that it will be eternally be licensed for everyone to
use.</p>

<p>Since then the Working Group has had many join, and has been making solid progress
working on revisions of the specification. <span class="nobr"><a href="http://jira.amqp.org/confluence/display/AMQP/About+AMQP"
title="Visit page outside Confluence" rel="nofollow">For more details see.<sup><img
class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span></p>

<h3><a name="FAQ-WhyuseAMQP%3F"></a>Why use AMQP?</h3>

<p>AMQP is has been designed to be able to handle the hardest workloads, scale to the
largest systems, but also deal with reduction of change and maintenance costs by doing a refresh
on many aged practices. The specification is also not language specific allowing the freedom
from language and platform lock in, without compromise on user experience, security, scalability
and consistently excellent performance.</p>

<p><span class="nobr"><a href="http://jira.amqp.org/confluence/display/AMQP/About+AMQP"
title="Visit page outside Confluence" rel="nofollow">Text mostly taken from<sup><img
class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle"
alt="" border="0"/></sup></a></span></p>

<h2><a name="FAQ-Qpid%26AMQP"></a>Qpid &amp; AMQP</h2>


<h3><a name="FAQ-IsQpidAMQPCompliant%3F"></a>Is Qpid AMQP Compliant?</h3>

<p>Yes, Apache Qpid implements the latest AMQP specifications, providing transaction
management, queuing, distribution, security, management, clustering, federation and heterogeneous
multi-platform support and a lot more. And Apache Qpid is extremely fast. <a href="/confluence/display/qpid/AMQP+compatibility"
title="AMQP compatibility">Apache Qpid aims to be 100% AMQP Compliant</a>.</p>

<h3><a name="FAQ-WhatClientsupportdoesQpidhave%3F"></a>What Client support
does Qpid have?</h3>

<p>Apache Qpid provides AMQP Client APIs for the following languages:</p>
<ul>
	<li>C+&#43;</li>
	<li>C# .NET, using WCF</li>
	<li>Ruby</li>
	<li>Python</li>
	<li>Java JMS, fully conformant with Java CTS1.1</li>
</ul>


<p>If you need another client, join the lists and ask or feel free to contribute one.</p>

<h2><a name="FAQ-WhatmessagingtopologiesaresupportedbyAMQPandQpid%3F"></a>What
messaging topologies are supported by AMQP and Qpid?</h2>

<p>AMQP provides the ability to do Point-to-Point, Peer-to-Peer, Pub-Sub, and Eventing.
This allows many patterns to be craeted:</p>

<p><ins><b>Point-to-point</b></ins></p>

<p>This is one of the simplest use-cases. AMQP allows for this in a few ways. <br/>
 a.) A client can create a named queue allowing the producer to publish the message to the
direct exchange with the key mapping the queue name. This will route the message to that queue.<br/>
 b.) The above pattern can be extended by specifying a reply-to address in the published messages
allowing for the consumer to reply the producer without knowing who it was send from prior
to receiving the message.</p>

<p><ins><b>One-to-many</b></ins></p>

<p>There are a few patterns that can be used.</p>

<p>     a.) AMQP provides a 'fanout' exchange which will send a message to all the queues
that have been bound to it. Different domains or topics are created with the 'fanout' exchange
by declaring different named fan-out exchanges.</p>

<p>    b.) A 'topic' or 'headers' exchange can also be used. in this case the pattern
match is used to send the message to all the bound queues. It can be thought of as a filter
allowing you to create just about any One-to-many routing patterns.</p>

<p><ins><b>Pub-Sub</b></ins></p>

<p>Topic can be created with the 'topic' or other 'direct' exchange to allow consumer
to bind to into the steams of data they care about. This pattern combined with the use of
reply-to and Alternate-routing is the staple of what most people use messaging for today.</p>

<p><ins><b>FAST Reliable Messaging</b></ins></p>

<p>AMQP 0-10 allows for fully reliable transfers between any two peers. This means that
you can publish or subscribe to the broker fully reliable without requiring the need for transactions.
This can all be done in async mode with the C++ broker allowing for high throughput while
running entirely reliable.</p>

<p><ins><b>Transactional</b></ins></p>

<p>AMQP supports two types of transactions in AMQP 0-10, TX and DTX. This allows for
local (1PC), and 2PC transaction and the ability to coordinate with a TM (Transaction Manager).
The Java broker supports TX, the C++ broker support TX, DTX, XA, JTA for fully ACID transactions.
This allows you to commit a single unit of work with may contain enqueues &amp; dequeues
either locally on the broker, or in coordination with other transactional resource like RDBMS.</p>

<p><ins><b>Transient message delivery</b></ins></p>

<p>By default messages are transient. Transient message can be sent to queues that are
durable. They will not be safe stored or recovered, and will perform as any other transient
message - fast!</p>

<p><ins><b>Durable message delivery</b></ins></p>

<p>There is a header on each message where the message properties are specified, one
of these is durability. Messages that are marked as durable and published to a durable queue
will be safe stored. Durable messages will survive restart of the broker or cluster.</p>

<p><ins><b>Federation (Hub-spoke, Trees, graphs)</b></ins></p>

<p>As AMQP 0-10 is symmetric for peer-to-peer communication all the building block are
in place for creating networks of brokers. The C++ broker allows you to link the brokers together
using 'qpid-route' and then create routes between the brokers either statically or with dynamic
routes. </p>

<p>This allows for a message to be published to one broker and consumed from another
broker in the federated broker network. This feature is great to create data-center, or project
isolation, but allow cross communication. It also allows networks to be created to scaled.
<a href="/confluence/display/qpid/Using+Broker+Federation" title="Using Broker Federation">For
more details see</a></p>

<p><ins><b>And many others, including custom pattern</b></ins></p>

<p><ins><b>Message Reply, Rings, Initial Value Caches, Last Value Messaging</b></ins></p>

<p>All the above cases can be constructed using the AMQP and features of Qpid. For example
reply can be constructed using message browsing and setting TTL on the messages. The C++ broker
also support ring queues, last value queues, initial value caches on exchanges. With a bit
of throught many additional patterns can be constructed.</p>

<p><b><ins>Store-and-forward</ins></b></p>

<p>Store-and-forward can be achieved by publishing to well know durable queues, that
are not marked with auto delete. Consumers will be able to 'came back' to consume then at
any time, even after restarts.</p>



<h2><a name="FAQ-Performance"></a>Performance</h2>

<h3><a name="FAQ-DoesQpidPerform%28Latency%2FThroughput%29%3F"></a>Does
Qpid Perform (Latency/Throughput)?</h3>

<p>Yes, The Qpid C++ broker has been achieved great benchmark results in published papers
by those that redistribute it. <span class="nobr"><a href="http://www.redhat.com/mrg"
title="Visit page outside Confluence" rel="nofollow">Red Hat MRG<sup><img class="rendericon"
src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt=""
border="0"/></sup></a></span> product build on Qpid has shown 760,000msg/sec
ingress on an 8 way box or 6,000,000msg/sec OPRA messages.</p>

<p>Latencies have been recored as low as 180-250us (.18ms-.3ms) for TCP round trip and
60-80us for RDMA round trip using the C++ broker.</p>

<h1><a name="FAQ-HowTo"></a>How To</h1>


<h3><a name="FAQ-HowtouseRDMAwithQpid"></a>How to use RDMA with Qpid</h3>

<p>The RDMA plugin uses native OFED1.3 and puts AMQP directly onto the DMA. When using
the RDMA plug-in for Qpid note the following</p>
<ul>
	<li>IP over IB or Fibre needs to be setup for the initial negociation</li>
	<li>You need to make sure you have enough memory to pin for DMA use ulimit &#45;l
something large</li>
	<li>you might need to edit /etc/security/limits.conf first then log in again</li>
</ul>


<p>Once you have it up and running, use latencytest to make sure it is working. You
should see latencies between 50 and 80us round trip.</p>

<h3><a name="FAQ-MessageTTL%2Cautoexpire"></a>Message TTL, auto expire</h3>

<p>I need to be able to set time for a message that I send to be removed from the queue
if it is not read by my subscriber.  For example: I enqueue a message and I want it to be
automatically dequeued after a certain amount of time has passed.Is there a feature like this
in qpid?</p>

<p>yes, the TTL can be set in the message headers and the messages get dequeued if TTL
expires</p>

<p>E.g. from c++:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">Message m(<span class="code-quote">"Hello World!"</span>);
    m.getDeliveryProperties().setTtl(500);</pre>
</div></div>
<p>Sets a 500 millisecond timeout.</p>

<h3><a name="FAQ-Howtoinstalltheqpidtoolsforcbooker%3F"></a>How to install
the qpid-tools for c++ booker?</h3>

<p>I see</p>
<div class="code"><div class="codeContent">
<pre class="code-java">[commands]$ ./qpid-queue-stats
 Traceback (most recent call last):
 File <span class="code-quote">"./qpid-queue-stats"</span>, line 29, in
 from qmf.console <span class="code-keyword">import</span> Session, Console
 ImportError: No module named qmf.console</pre>
</div></div>

<p>This problem occurs because the PYTHONPATH environment variable does not include
the location of the qpid python files.  If you are running from the SVN checkout, add &lt;path&gt;/qpid/python
to PYTHONPATH (where &lt;path&gt; is the location of your SVN tree).  If you are installing
from source, make sure you configure with the same prefix where Python is installed.  This
is most likely:</p>

<div class="code"><div class="codeContent">
<pre class="code-java"># configure --prefix=/usr
# make
# make install</pre>
</div></div>
<p>If you are running from vendor RPMs, this should work automatically.</p></div>


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