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amazon-web-servicessessionjmeterautoscalingcookiemanager

Jmeter Cookie manager impact of AWS sticky sessions

I have created a Jmeter script to check the performance of a site. The website is hosted in AWS with elastic scaling and with sticky sessions. Basically the AWS load balancer will assign a session cookie to each user so the load balancer can direct the user to the correct instance.

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My problem is, as I'm using a cookie manager and clearing all the cookies with each iteration. Does it clear these assigned cookies too? I suspect this because the script error rate is lower when we execute the script on a single AWS instance than in auto-scaling ( multiple instances )

Any idea ?

Solution

  • The problem was not with the JMeter script. It's with the AWS ELB in a elastic server config. We had configured a Alarm to remove the instance from load balancer, so even with the stickey sessions enabled when the instance is removed it generated the error. After moving the session managemet to a Elasticache - Redid based solution, this issue will be fixed.

    Thank you all who supported.