Hi William, Thanks for the feedback. Have 1 question:
On Tue, Apr 20, 2010 at 10:12 PM, William Oberman <ober...@gmail.com> wrote: > > 2.) For a given ELB IP, there seems to be a static mapping of client IP <-> > backend instance. This is a slightly complicated statement that assumes a > some knowledge of how amazon in general, and ELBs in particular, work. If > it's still up, this page: > Are you referring to HTTP stickiness here, or did you find that client IP <-> backend instance is mapped for TCP connections too? (have been discussing this on the forums, and not getting an answer to this). On the 7th of April, Amazon introduced sticky HTTP sessions on ELB (check the sticky forum post for more info - http://developer.amazonwebservices.com/connect/ann.jspa?annID=646). This should result in each thread in a jmeter test plan going through to the same node if you have a cookie manager. Then again, if there is indeed a static mapping of client IP to instance, you would need to use multiple instances of jmeter-server with a central controller to effectively test load balancing One of the responses to my post contained the link below, which states "According to user reports in other forum posts, clients from a single IP address will tend to be connected to the same back-end instance." but i was wondering if you have been able to verify this? Our scenario is greatly affected by this characteristic of ELB, as our entire web app is HTTPS-based. > > http://www.shlomoswidler.com/2009/07/elastic-in-elastic-load-balancing-elb.html > has pretty much everything you need to know.
