92 lines
4.3 KiB
Markdown
92 lines
4.3 KiB
Markdown
# Critical Analysis of the broker
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There are a few things that can go wrong on a production environment:
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- Bugs, for more than we try they still happen! We always try to correct them, but that's the only constant in software development.
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- IO Errors, disks and hardware can go bad
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- Memory issues, the CPU can go crazy by another process
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For cases like this, we added a protection to the broker to shut itself down when bad things happen.
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This is a feature I hope you won't need it, think it as a safeguard:
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We measure time response in places like:
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- Queue delivery (add to the queue)
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- Journal storage
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- Paging operations
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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.
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You can use these following configuration options on broker.xml to configure how the critical analysis is performed.
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Name | Description
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:--- | :---
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critical-analyzer | Enable or disable the critical analysis (default true)
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critical-analyzer-timeout | Timeout used to do the critical analysis (default 120000 milliseconds)
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critical-analyzer-check-period | Time used to check the response times (default half of critical-analyzer-timeout)
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critical-analyzer-policy | Should the server log, be halted or shutdown upon failures (default `LOG`)
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The default for critical-analyzer-policy is `LOG`, however the generated broker.xml will have it set to `HALT`. That is because we cannot halt the VM if you are embedding ActiveMQ Artemis into an application server or on a multi tenant environment.
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The broker on the distribution will then have it set to `HALT`, but if you use it in any other way the default will be `LOG`.
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## What to Expect
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- You will see some logs
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If you have critical-analyzer-policy=HALT
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```
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[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
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```
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While if you have critical-analyzer-policy=SHUTDOWN
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```
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[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
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```
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Or if you have critical-analyzer-policy=LOG
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```
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[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$2@5af97850 is not responsive
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```
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You will see a simple thread dump of the server
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```
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[Artemis Critical Analyzer] 18:10:00,836 WARN [org.apache.activemq.artemis.core.server] AMQ222199: Thread dump: AMQ119001: Generating thread dump
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*******************************************************************************
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===============================================================================
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AMQ119002: Thread Thread[Thread-1 (ActiveMQ-scheduled-threads),5,main] name = Thread-1 (ActiveMQ-scheduled-threads) id = 19 group = java.lang.ThreadGroup[name=main,maxpri=10]
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sun.misc.Unsafe.park(Native Method)
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java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
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java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
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java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1088)
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java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
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java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
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java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
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java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
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java.lang.Thread.run(Thread.java:745)
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===============================================================================
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..... blablablablaba ..........
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===============================================================================
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AMQ119003: End Thread dump
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*******************************************************************************
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```
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- The Server will be halted if configured to `HALT`
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- The system will be stopped if `SHUTDOWN` is used:
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* Notice that if the system is not behaving well, there is no guarantees the stop will work.
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