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From "Hiranya Jayathilaka (JIRA)" <j...@apache.org>
Subject [jira] Created: (SYNAPSE-661) ConcurrentModifucationException at StatisticsRecord
Date Wed, 09 Jun 2010 11:41:14 GMT
ConcurrentModifucationException at StatisticsRecord
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                 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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