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From "Hiranya Jayathilaka (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SYNAPSE-661) ConcurrentModifucationException at StatisticsRecord
Date Wed, 09 Jun 2010 11:49:13 GMT

    [ https://issues.apache.org/jira/browse/SYNAPSE-661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12877053#action_12877053
] 

Hiranya Jayathilaka commented on SYNAPSE-661:
---------------------------------------------

How about using a ConcurrentLinkedQueue instead of ArrayList?

> ConcurrentModifucationException at StatisticsRecord
> ---------------------------------------------------
>
>                 Key: SYNAPSE-661
>                 URL: https://issues.apache.org/jira/browse/SYNAPSE-661
>             Project: Synapse
>          Issue Type: Bug
>    Affects Versions: 1.2
>            Reporter: Hiranya Jayathilaka
>            Assignee: indika priyantha kumara
>             Fix For: 2.0
>
>
> When running load tests (concurrency level > 15) with statistics enabled, every now
and then, I get the following exception:
> Exception in thread "Thread-20" java.util.ConcurrentModificationException
> 	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
> 	at java.util.AbstractList$Itr.next(AbstractList.java:343)
> 	at org.apache.synapse.aspects.statistics.StatisticsRecord.getAllLogIds(StatisticsRecord.java:90)
> 	at org.apache.synapse.aspects.statistics.view.SystemViewStrategy.determineView(SystemViewStrategy.java:61)
> Here I also have some custom code which tries to get the latest stats from Synapse periodically.
When the custom code tries to access a StatisticsRecord, if it also gets updated, the above
error is thrown. I think we should use a more thread safe data structure in the StatisticsRecord
class, instead of an ArrayList.

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