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| <h1>Critical Analysis of the broker</h1> |
| <div id="toc" class="toc2"> |
| <div id="toctitle"><a href="index.html">User Manual for 2.32.0</a></div> |
| <ul class="sectlevel1"> |
| <li><a href="#what-to-expect">1. What to Expect</a></li> |
| </ul> |
| </div> |
| </div> |
| <div id="content"> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>There are a few things that can go wrong on a production environment:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Bugs, for more than we try they still happen! |
| We always try to correct them, but that’s the only constant in software development.</p> |
| </li> |
| <li> |
| <p>IO Errors, disks and hardware can go bad</p> |
| </li> |
| <li> |
| <p>Memory issues, the CPU can go crazy by another process</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>For cases like this, we added a protection to the broker to shut itself down when bad things happen.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This is a feature I hope you won’t need it, think it as a safeguard:</p> |
| </div> |
| <div class="paragraph"> |
| <p>We measure time response in places like:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Queue delivery (add to the queue)</p> |
| </li> |
| <li> |
| <p>Journal storage</p> |
| </li> |
| <li> |
| <p>Paging operations</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <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> |
| </div> |
| <div class="paragraph"> |
| <p>You can use these following configuration options on broker.xml to configure how the critical analysis is performed.</p> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">critical-analyzer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Enable or disable the critical analysis (default true)</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">critical-analyzer-timeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timeout used to do the critical analysis (default 120000 milliseconds)</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">critical-analyzer-check-period</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Time used to check the response times (default half of critical-analyzer-timeout)</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">critical-analyzer-policy</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Should the server log, be halted or shutdown upon failures (default <code>LOG</code>)</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <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> |
| </div> |
| <div class="paragraph"> |
| <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> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="what-to-expect"><a class="anchor" href="#what-to-expect"></a><a class="link" href="#what-to-expect">1. What to Expect</a></h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>You will see some logs</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>If you have critical-analyzer-policy=HALT</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="nowrap">[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</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>While if you have critical-analyzer-policy=<code>SHUTDOWN</code></p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="nowrap">[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</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Or if you have critical-analyzer-policy=LOG</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="nowrap">[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$2@5af97850 is not responsive</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>You will see a simple thread dump of the server</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="nowrap">[Artemis Critical Analyzer] 18:10:00,836 WARN [org.apache.activemq.artemis.core.server] AMQ222199: Thread dump: AMQ119001: Generating thread dump |
| ******************************************************************************* |
| =============================================================================== |
| AMQ119002: Thread Thread[Thread-1 (ActiveMQ-scheduled-threads),5,main] name = Thread-1 (ActiveMQ-scheduled-threads) id = 19 group = java.lang.ThreadGroup[name=main,maxpri=10] |
| |
| sun.misc.Unsafe.park(Native Method) |
| java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) |
| java.util.concurrent.locks.AbstractQueuedSynchronizer$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 |
| *******************************************************************************</pre> |
| </div> |
| </div> |
| <div class="ulist"> |
| <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. |
| <strong>Notice</strong>: If the system is not behaving well, there is no guarantees the stop will work.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
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