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From "Jayson Minard (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQ-1971) ConcurrentModificationException in high volume broker
Date Sat, 11 Oct 2008 22:57:52 GMT

    [ https://issues.apache.org/activemq/browse/AMQ-1971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=46374#action_46374
] 

Jayson Minard commented on AMQ-1971:
------------------------------------

This is on 5.2.0 built from SVN tag of the same name.  Client producer/consumers use POM 5.2.0
from staging server.

Bug also exists when running on 1 broker without a network of brokers.  

The series of queues basically are via Camel:

File -> parsing -> queue
queue -> normalization -> queue
queue -> database transactions -> queue
queue -> external systems 

> ConcurrentModificationException in high volume broker 
> ------------------------------------------------------
>
>                 Key: AMQ-1971
>                 URL: https://issues.apache.org/activemq/browse/AMQ-1971
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.2.0
>            Reporter: Jayson Minard
>
> This is occurring in the thousands as messages come through.    We have a network of
5 brokers although they do most of their work internally (publisher/consumer for queue are
only on same broker) and do less work crossing to a central broker.
> java.util.ConcurrentModificationException
> 	at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:373)
> 	at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:392)
> 	at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:391)
> 	at org.apache.activemq.broker.region.cursors.AbstractStoreCursor.next(AbstractStoreCursor.java:136)
> 	at org.apache.activemq.broker.region.cursors.StoreQueueCursor.next(StoreQueueCursor.java:140)
> 	at org.apache.activemq.broker.region.Queue.doPageIn(Queue.java:1178)
> 	at org.apache.activemq.broker.region.Queue.pageInMessages(Queue.java:1290)
> 	at org.apache.activemq.broker.region.Queue.iterate(Queue.java:1004)
> 	at org.apache.activemq.thread.DeterministicTaskRunner.runTask(DeterministicTaskRunner.java:84)
> 	at org.apache.activemq.thread.DeterministicTaskRunner$1.run(DeterministicTaskRunner.java:41)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> 	at java.lang.Thread.run(Thread.java:619)

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