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From "Hadrian Zbarcea (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AMQ-5337) Bug in ConcurrentLinkedQueue leads to excessive CPU-consumption by ActiveMQ process
Date Thu, 18 Dec 2014 00:52:13 GMT

     [ https://issues.apache.org/jira/browse/AMQ-5337?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hadrian Zbarcea updated AMQ-5337:
---------------------------------
    Fix Version/s: 5.10.1

> Bug in ConcurrentLinkedQueue leads to excessive CPU-consumption by ActiveMQ process
> -----------------------------------------------------------------------------------
>
>                 Key: AMQ-5337
>                 URL: https://issues.apache.org/jira/browse/AMQ-5337
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.9.0, 5.9.1, 5.10.0
>         Environment: Linux Ubuntu
>            Reporter: Wawan
>             Fix For: 5.10.1, 5.11.0
>
>
> The AdvisoryBroker use a ConcurrentLinkedQueue to store consumers.
> This standard JDK class has a bug which can lead to an OutOfMemory : https://bugs.openjdk.java.net/browse/JDK-8054446
> In our environment we observe that ActiveMQ process cpu usage is continually climbing
and that the ConcurrentLinkedQueue in the AdvisoryBroker grows indefinitely.
> The ConcurrentLinkedQueue is a non-blocking concurrent FIFO datastructure provided by
the core Java Development Kit API starting from Java 5. 
> AdvisoryBroker use offer() method to add a new consumer in the ConcurrentLinkedQueue,
and remove() method to remove it.
> When the consumer removed is the last element of the queue, the Consumer object is nulled
but a node remain in the queue. The null node is then never garbage collected. This is true
only for the last element of the queue. Any other element is removed safely.
> Related bug : https://issues.apache.org/jira/browse/AMQ-4853



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