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From "Vijayaratha Vijayasingam (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SYNAPSE-853) When sending concurrent requests to a statistics enabled sequence, getting "concurrent modification exception"
Date Wed, 14 Mar 2012 17:02:45 GMT
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


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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