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https://issues.apache.org/jira/browse/AMQ-6062?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dumitru HUSLEAG updated AMQ-6062:
---------------------------------
Attachment: (was: Thread dump analysis - screenshot.png)
> Broker goes 100% CPU on multi-queue command line browse
> -------------------------------------------------------
>
> Key: AMQ-6062
> URL: https://issues.apache.org/jira/browse/AMQ-6062
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.9.1, 5.12.0
> Environment: Linux Ubuntu, Aix, with both Java 6 and Java 7 (either
> IBM or Oracle)
> Reporter: Dumitru HUSLEAG
> Priority: Critical
> Attachments: ActiveMQ_BrowseInfiniteLoopUseCase.jmx,
> ThreadStatusAnalysis_2015-11-25_14h13m33s.png
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> Hello,
> The case happend in a production environment forcing us to kill the broker
> and restart because he was nor responding anymore to clients.
> The Broker may enter a state of high CPU consumption (100% or 200% if 2
> browse enter the infinite loop in the same time on a multi-core).
> I assume the infinite loop based on successive thread dumps that show the
> browse thread remaines in the same place:
> Another IBM Link:
> http://www-01.ibm.com/support/docview.wss?uid=swg21597581
> {quote}
> at java/util/HashMap.rehash(HashMap.java:782(Compiled Code))
> at java/util/HashMap.rehash(HashMap.java:819(Compiled Code))
> at java/util/HashMap.putImpl(HashMap.java:702(Compiled Code))
> at java/util/HashMap.put(HashMap.java:680(Compiled Code))
> at
> org/apache/activemq/broker/region/QueueBrowserSubscription.isDuplicate(QueueBrowserSubscription.java:72(Compiled
> Code))
> at org/apache/activemq/broker/region/Queue.iterate(Queue.java:1688(Compiled
> Code))
> at
> org/apache/activemq/thread/PooledTaskRunner.runTask(PooledTaskRunner.java:133(Compiled
> Code)).
> {quote}
> Tested versions: 5.9.1 and the last, 5.12.0, but of course I suppose all in
> beetwen are affected.
> The cause seems to be the non-threadsafe usage of the audit HashMap member of
> QueueBrowserSubscription.java class.
> The scenario may be produced with a fresh non modified install (default
> config) of ActiveMQ broker:
> 1. set ACTIVEMQ_HOME, JAVA_HOME and PATH to point accordingly to the right
> activemq, and Java version.
> 2. cd $ACTIVEMQ_HOME/bin; ./activemq start
> 3. inject at least 2000 messages in each of two ques, say QA.ONE and QA.TWO
> 4. $ $ACTIVEMQ_HOME/bin/activemq browse --view JMSDestination,JMSMessageID
> --amqurl tcp://localhost:61616 QA.*
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