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From "Vijayaratha Vijayasingam (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SYNAPSE-853) When sending concurrent requests to a statistics enabled sequence, getting "concurrent modification exception"
Date Wed, 14 Mar 2012 17:04:41 GMT

     [ https://issues.apache.org/jira/browse/SYNAPSE-853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vijayaratha Vijayasingam updated SYNAPSE-853:
---------------------------------------------

    Attachment: statisticsReport.patch

attaching the patch, please review and commit
                
> 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
>            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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