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https://issues.apache.org/jira/browse/SYNAPSE-853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hiranya Jayathilaka resolved SYNAPSE-853.
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Resolution: Fixed
Thanks for pointing this out. The CopyOnWriteArrayList seems to be costly. It
duplicates the underlying array on each write. I fixed the issue by using a
ConcurrentLinkedQueue instead, which uses a more efficient wait-free
synchronization algorithm.
> When sending concurrent requests to a statistics enabled sequence, getting
> "concurrent modification exception"
> --------------------------------------------------------------------------------------------------------------
>
> Key: SYNAPSE-853
> URL: https://issues.apache.org/jira/browse/SYNAPSE-853
> Project: Synapse
> Issue Type: Bug
> Components: Tracing and Statistics
> Affects Versions: 2.1
> Reporter: Vijayaratha Vijayasingam
> Assignee: Hiranya Jayathilaka
> Priority: Critical
> Fix For: NIGHTLY
>
> Attachments: statisticsReport.patch
>
>
> When sending concurrent requests(tps~=250) for a statistics enabled sequence,
> I'm getting "ConcurrentModificationException" [1]
> @ StatisticsRecord class, Arraylist(which is not thread safe), is used to
> collect all statistics logs. ..
> Instead of Arraylist, we can use "CopyOnWriteArrayList" which is thread safe
> and allows multiple concurrent reads, and for reads to occur concurrently
> with a write..
> I tested with this option and did not notice any considerable performance
> change..
> [1][2012-03-14 22:10:16,398] ERROR - StatisticsReporterThread Error while
> collecting and reporting mediation statistics
> 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:88)
> at
> org.apache.synapse.aspects.statistics.view.SystemViewStrategy.determineView(SystemViewStrategy.java:61)
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