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+ <a href="." >Core Bridges</a>
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+
+ <h1 id="core-bridges">Core Bridges</h1>
+<p>The function of a bridge is to consume messages from a source queue, and
+forward them to a target address, typically on a different Apache ActiveMQ Artemis
+server.</p>
+<p>The source and target servers do not have to be in the same cluster
+which makes bridging suitable for reliably sending messages from one
+cluster to another, for instance across a WAN, or internet and where the
+connection may be unreliable.</p>
+<p>The bridge has built in resilience to failure so if the target server
+connection is lost, e.g. due to network failure, the bridge will retry
+connecting to the target until it comes back online. When it comes back
+online it will resume operation as normal.</p>
+<p>In summary, bridges are a way to reliably connect two separate Apache ActiveMQ Artemis
+servers together. With a core bridge both source and target servers must
+be Apache ActiveMQ Artemis servers.</p>
+<p>Bridges can be configured to provide <em>once and only once</em> delivery
+guarantees even in the event of the failure of the source or the target
+server. They do this by using duplicate detection (described in <a href="duplicate-detection.html">Duplicate Detection</a>).</p>
+<blockquote>
+<p><strong>Note</strong></p>
+<p>Although they have similar function, don't confuse core bridges with
+JMS bridges!</p>
+<p>Core bridges are for linking an Apache ActiveMQ Artemis node with another Apache ActiveMQ Artemis
+node and do not use the JMS API. A JMS Bridge is used for linking any
+two JMS 1.1 compliant JMS providers. So, a JMS Bridge could be used
+for bridging to or from different JMS compliant messaging system. It's
+always preferable to use a core bridge if you can. Core bridges use
+duplicate detection to provide <em>once and only once</em> guarantees. To
+provide the same guarantee using a JMS bridge you would have to use XA
+which has a higher overhead and is more complex to configure.</p>
+</blockquote>
+<h2 id="configuring-bridges">Configuring Bridges</h2>
+<p>Bridges are configured in <code>broker.xml</code>. Let's kick off
+with an example (this is actually from the bridge example):</p>
+<pre><code><bridge name="my-bridge">
+ <queue-name>sausage-factory</queue-name>
+ <forwarding-address>mincing-machine</forwarding-address>
+ <filter string="name='aardvark'"/>
+ <transformer-class-name>
+ org.apache.activemq.artemis.jms.example.HatColourChangeTransformer
+ </transformer-class-name>
+ <retry-interval>1000</retry-interval>
+ <ha>true</ha>
+ <retry-interval-multiplier>1.0</retry-interval-multiplier>
+ <initial-connect-attempts>-1</initial-connect-attempts>
+ <reconnect-attempts>-1</reconnect-attempts>
+ <failover-on-server-shutdown>false</failover-on-server-shutdown>
+ <use-duplicate-detection>true</use-duplicate-detection>
+ <confirmation-window-size>10000000</confirmation-window-size>
+ <user>foouser</user>
+ <password>foopassword</password>
+ <static-connectors>
+ <connector-ref>remote-connector</connector-ref>
+ </static-connectors>
+ <!-- alternative to static-connectors
+ <discovery-group-ref discovery-group-name="bridge-discovery-group"/>
+ -->
+</bridge>
+</code></pre><p>In the above example we have shown all the parameters its possible to
+configure for a bridge. In practice you might use many of the defaults
+so it won't be necessary to specify them all explicitly.</p>
+<p>Let's take a look at all the parameters in turn:</p>
+<ul>
+<li><p><code>name</code> attribute. All bridges must have a unique name in the server.</p>
+</li>
+<li><p><code>queue-name</code>. This is the unique name of the local queue that the
+bridge consumes from, it's a mandatory parameter.</p>
+<p>The queue must already exist by the time the bridge is instantiated
+at start-up.</p>
+</li>
+<li><p><code>forwarding-address</code>. This is the address on the target server that
+the message will be forwarded to. If a forwarding address is not
+specified, then the original address of the message will be
+retained.</p>
+</li>
+<li><p><code>filter-string</code>. An optional filter string can be supplied. If
+specified then only messages which match the filter expression
+specified in the filter string will be forwarded. The filter string
+follows the ActiveMQ Artemis filter expression syntax described in <a href="filter-expressions.html">Filter Expressions</a>.</p>
+</li>
+<li><p><code>transformer-class-name</code>. An optional transformer-class-name can be
+specified. This is the name of a user-defined class which implements
+the <code>org.apache.activemq.artemis.core.server.cluster.Transformer</code> interface.</p>
+<p>If this is specified then the transformer's <code>transform()</code> method
+will be invoked with the message before it is forwarded. This gives
+you the opportunity to transform the message's header or body before
+forwarding it.</p>
+</li>
+<li><p><code>ha</code>. This optional parameter determines whether or not this bridge
+should support high availability. True means it will connect to any
+available server in a cluster and support failover. The default
+value is <code>false</code>.</p>
+</li>
+<li><p><code>retry-interval</code>. This optional parameter determines the period in
+milliseconds between subsequent reconnection attempts, if the
+connection to the target server has failed. The default value is
+<code>2000</code>milliseconds.</p>
+</li>
+<li><p><code>retry-interval-multiplier</code>. This optional parameter determines
+determines a multiplier to apply to the time since the last retry to
+compute the time to the next retry.</p>
+<p>This allows you to implement an <em>exponential backoff</em> between retry
+attempts.</p>
+<p>Let's take an example:</p>
+<p>If we set <code>retry-interval</code>to <code>1000</code> ms and we set
+<code>retry-interval-multiplier</code> to <code>2.0</code>, then, if the first reconnect
+attempt fails, we will wait <code>1000</code> ms then <code>2000</code> ms then <code>4000</code> ms
+between subsequent reconnection attempts.</p>
+<p>The default value is <code>1.0</code> meaning each reconnect attempt is spaced
+at equal intervals.</p>
+</li>
+<li><p><code>initial-connect-attempts</code>. This optional parameter determines the
+total number of initial connect attempts the bridge will make before
+giving up and shutting down. A value of <code>-1</code> signifies an unlimited
+number of attempts. The default value is <code>-1</code>.</p>
+</li>
+<li><p><code>reconnect-attempts</code>. This optional parameter determines the total
+number of reconnect attempts the bridge will make before giving up
+and shutting down. A value of <code>-1</code> signifies an unlimited number of
+attempts. The default value is <code>-1</code>.</p>
+</li>
+<li><p><code>failover-on-server-shutdown</code>. This optional parameter determines
+whether the bridge will attempt to failover onto a backup server (if
+specified) when the target server is cleanly shutdown rather than
+crashed.</p>
+<p>The bridge connector can specify both a live and a backup server, if
+it specifies a backup server and this parameter is set to <code>true</code>
+then if the target server is <em>cleanly</em> shutdown the bridge
+connection will attempt to failover onto its backup. If the bridge
+connector has no backup server configured then this parameter has no
+effect.</p>
+<p>Sometimes you want a bridge configured with a live and a backup
+target server, but you don't want to failover to the backup if the
+live server is simply taken down temporarily for maintenance, this
+is when this parameter comes in handy.</p>
+<p>The default value for this parameter is <code>false</code>.</p>
+</li>
+<li><p><code>use-duplicate-detection</code>. This optional parameter determines
+whether the bridge will automatically insert a duplicate id property
+into each message that it forwards.</p>
+<p>Doing so, allows the target server to perform duplicate detection on
+messages it receives from the source server. If the connection fails
+or server crashes, then, when the bridge resumes it will resend
+unacknowledged messages. This might result in duplicate messages
+being sent to the target server. By enabling duplicate detection
+allows these duplicates to be screened out and ignored.</p>
+<p>This allows the bridge to provide a <em>once and only once</em> delivery
+guarantee without using heavyweight methods such as XA (see <a href="duplicate-detection.html">Duplicate Detection</a> for
+more information).</p>
+<p>The default value for this parameter is <code>true</code>.</p>
+</li>
+<li><p><code>confirmation-window-size</code>. This optional parameter determines the
+<code>confirmation-window-size</code> to use for the connection used to forward
+messages to the target node. This attribute is described in section
+<a href="client-reconnection.html">Reconnection and Session Reattachment</a></p>
+<blockquote>
+<p><strong>Warning</strong></p>
+<p>When using the bridge to forward messages to an address which uses
+the <code>BLOCK</code> <code>address-full-policy</code> from a queue which has a
+<code>max-size-bytes</code> set it's important that
+<code>confirmation-window-size</code> is less than or equal to
+<code>max-size-bytes</code> to prevent the flow of messages from ceasing.</p>
+</blockquote>
+</li>
+<li><p><code>producer-window-size</code>. This optional parameter determines the
+producer flow control through the bridge. You usually leave this off
+unless you are dealing with huge large messages. </p>
+<p>Default=-1 (disabled)</p>
+</li>
+<li><p><code>user</code>. This optional parameter determines the user name to use when
+creating the bridge connection to the remote server. If it is not
+specified the default cluster user specified by <code>cluster-user</code> in
+<code>broker.xml</code> will be used.</p>
+</li>
+<li><p><code>password</code>. This optional parameter determines the password to use
+when creating the bridge connection to the remote server. If it is
+not specified the default cluster password specified by
+<code>cluster-password</code> in <code>broker.xml</code> will be used.</p>
+</li>
+<li><p><code>static-connectors</code> or <code>discovery-group-ref</code>. Pick either of these
+options to connect the bridge to the target server.</p>
+<p>The <code>static-connectors</code> is a list of <code>connector-ref</code> elements
+pointing to <code>connector</code> elements defined elsewhere. A <em>connector</em>
+encapsulates knowledge of what transport to use (TCP, SSL, HTTP etc)
+as well as the server connection parameters (host, port etc). For
+more information about what connectors are and how to configure
+them, please see <a href="configuring-transports.html">Configuring the Transport</a>.</p>
+<p>The <code>discovery-group-ref</code> element has one attribute -
+<code>discovery-group-name</code>. This attribute points to a <code>discovery-group</code>
+defined elsewhere. For more information about what discovery-groups
+are and how to configure them, please see <a href="clusters.html">Discovery Groups</a>.</p>
+</li>
+</ul>
+
+
+ </section>
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--- websites/production/activemq/content/artemis/docs/latest/critical-analysis.html (added)
+++ websites/production/activemq/content/artemis/docs/latest/critical-analysis.html Thu Sep 14 19:48:11 2017
@@ -0,0 +1,1147 @@
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+ Mapping JMS Concepts to the Core API
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+ Routing Messages With Wild Cards
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+ <li class="chapter " data-level="1.16" data-path="wildcard-syntax.html">
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+ Understanding the Apache ActiveMQ Artemis Wildcard Syntax
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+ Filter Expressions
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+ <a href="configuring-transports.html">
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+ Configuring Transports
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+ <a href="connection-ttl.html">
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+ Detecting Dead Connections
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+ Detecting Slow Consumers
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+ Avoiding Network Isolation
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+ <a href="critical-analysis.html">
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+ Detecting Broker Issues (Critical Analysis)
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+ </a>
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+ <a href="transaction-config.html">
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+ Resource Manager Configuration
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+ Flow Control
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+ Guarantees of sends and commits
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+ Message Redelivery and Undelivered Messages
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+ Message Expiry
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+ Large Messages
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+ Queue Attributes
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+ Scheduled Messages
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+
+ <a href="last-value-queues.html">
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+ Last-Value Queues
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+ <a href="message-grouping.html">
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+ Message Grouping
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+ Extra Acknowledge Modes
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+ <li class="chapter " data-level="1.43" data-path="client-reconnection.html">
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+ <a href="client-reconnection.html">
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+ Client Reconnection and Session Reattachment
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+ <li class="chapter " data-level="1.44" data-path="diverts.html">
+
+ <a href="diverts.html">
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+ Diverting and Splitting Message Flows
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+ </a>
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+ </li>
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+ <li class="chapter " data-level="1.45" data-path="core-bridges.html">
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+ Core Bridges
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+ <li class="chapter " data-level="1.46" data-path="duplicate-detection.html">
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+ Duplicate Message Detection
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+ Graceful Server Shutdown
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+ <h1>
+ <i class="fa fa-circle-o-notch fa-spin"></i>
+ <a href="." >Detecting Broker Issues (Critical Analysis)</a>
+ </h1>
+</div>
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+
+ <h1 id="critical-analysis-of-the-broker">Critical Analysis of the broker</h1>
+<p>There are a few things that can go wrong on a production environment:</p>
+<ul>
+<li>Bugs, for more than we try they still happen! We always try to correct them, but that's the only constant in software development.</li>
+<li>IO Errors, disks and hardware can go bad</li>
+<li>Memory issues, the CPU can go crazy by another process</li>
+</ul>
+<p>For cases like this, we added a protection to the broker to shut itself down when bad things happen.</p>
+<p>This is a feature I hope you won't need it, think it as a safeguard:</p>
+<p>We measure time response in places like:</p>
+<ul>
+<li>Queue delivery (add to the queue)</li>
+<li>Journal storage</li>
+<li>Paging operations</li>
+</ul>
+<p>If the response time goes beyond a configured timeout, the broker is considered unstable and an action will be taken to either shutdown the broker or halt the VM.</p>
+<p>You can use these following configuration options on broker.xml to configure how the critical analysis is performed.</p>
+<table>
+<thead>
+<tr>
+<th style="text-align:left">Name</th>
+<th style="text-align:left">Description</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td style="text-align:left">critical-analyzer</td>
+<td style="text-align:left">Enable or disable the critical analysis (default true)</td>
+</tr>
+<tr>
+<td style="text-align:left">critical-analyzer-timeout</td>
+<td style="text-align:left">Timeout used to do the critical analysis (default 120000 milliseconds)</td>
+</tr>
+<tr>
+<td style="text-align:left">critical-analyzer-check-period</td>
+<td style="text-align:left">Time used to check the response times (default half of critical-analyzer-timeout)</td>
+</tr>
+<tr>
+<td style="text-align:left">critical-analyzer-policy</td>
+<td style="text-align:left">Should the server log, be halted or shutdown upon failures (default <code>LOG</code>)</td>
+</tr>
+</tbody>
+</table>
+<p>The default for critical-analyzer-policy is <code>LOG</code>, however the generated broker.xml will have it set to <code>HALT</code>. That is because we cannot halt the VM if you are embedding ActiveMQ Artemis into an application server or on a multi tenant environment.</p>
+<p>The broker on the distribution will then have it set to <code>HALT</code>, but if you use it in any other way the default will be <code>LOG</code>.</p>
+<h2 id="what-would-you-expect">What would you expect</h2>
+<ul>
+<li>You will see some logs</li>
+</ul>
+<p>If you have critical-analyzer-policy=HALT</p>
+<pre><code>[Artemis Critical Analyzer] 18:10:00,831 ERROR [org.apache.activemq.artemis.core.server] AMQ224079: The process for the virtual machine will be killed, as component org.apache.activemq.artemis.tests.integration.critical.CriticalSimpleTest$2@5af97850 is not responsive
+</code></pre><p>While if you have critical-analyzer-policy=SHUTDOWN</p>
+<pre><code>[Artemis Critical Analyzer] 18:07:53,475 ERROR [org.apache.activemq.artemis.core.server] AMQ224080: The server process will now be stopped, as component org.apache.activemq.artemis.tests.integration.critical.CriticalSimpleTest$2@5af97850 is not responsive
+</code></pre><p>Or if you have critical-analyzer-policy=LOG</p>
+<pre><code>[Artemis Critical Analyzer] 18:11:52,145 WARN [org.apache.activemq.artemis.core.server] AMQ224081: The component org.apache.activemq.artemis.tests.integration.critical.CriticalSimpleTest$2@5af97850 is not responsive
+</code></pre><p>You will see a simple thread dump of the server</p>
+<pre><code>[Artemis Critical Analyzer] 18:10:00,836 WARN [org.apache.activemq.artemis.core.server] AMQ222199: Thread dump: AMQ119001: Generating thread dump
+*******************************************************************************
+===============================================================================
+AMQ119002: Thread Thread[Thread-1 (ActiveMQ-scheduled-threads),5,main] name = Thread-1 (ActiveMQ-scheduled-threads) id = 19 group = java.lang.ThreadGroup[name=main,maxpri=10]
+
+sun.misc.Unsafe.park(Native Method)
+java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
+java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
+java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1088)
+java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
+java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
+java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
+java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
+java.lang.Thread.run(Thread.java:745)
+===============================================================================
+
+
+..... blablablablaba ..........
+
+
+===============================================================================
+AMQ119003: End Thread dump
+*******************************************************************************
+</code></pre><ul>
+<li><p>The Server will be halted if configured to <code>HALT</code></p>
+</li>
+<li><p>The system will be stopped if <code>SHUTDOWN</code> is used:</p>
+</li>
+<li>Notice that if the system is not behaving well, there is no guarantees the stop will work.</li>
+</ul>
+
+
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