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https://issues.apache.org/jira/browse/SYNAPSE-342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Asankha C. Perera resolved SYNAPSE-342.
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    Resolution: Fixed

fixed for 1.2

> Improvements for issues found during Performance and Load testing
> -----------------------------------------------------------------
>
>                 Key: SYNAPSE-342
>                 URL: https://issues.apache.org/jira/browse/SYNAPSE-342
>             Project: Synapse
>          Issue Type: Bug
>          Components: Core, Transports
>    Affects Versions: 1.2-beta1
>            Reporter: Asankha C. Perera
>            Assignee: Asankha C. Perera
>            Priority: Blocker
>             Fix For: 1.2
>
>
> During load testing, I encountered an error for about once in 300,000 to 
> 400,000 requests of 1K, iterating 1000 messages at 80 user concurrency. The 
> issue resulted in a 'Transfer-Encoding header already present' error, but the 
> cause was the Axis2FlexibleMEPClient.send()'s last two lines, which needs to 
> switch the request to skip the 202 accepted message with the 
> mepclient.execute() which could take time even with async NIO sender
> On performance front, I came across a few places where we used Axiom's 
> serialize() method instead of serializeAndConsume() - which was due to a bad 
> merge from the 1.1 codebase
> I am also adding a connection.isStale() check before returning a keepalive 
> connection for reuse to improve stability

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