[Deploying Sakai] Load balancer issues with heavy load

Aaron Zeckoski azeckoski at unicon.net
Thu Sep 1 10:24:04 PDT 2011

I believe that Sakai pretty much requires sticky sessions unless you
are using the terracotta stuff to share the session across lots of
servers. Something may have changed here that I am unaware of but I am
pretty positive this is still the case.


On Thu, Sep 1, 2011 at 12:38 PM, Maurer, Christopher Wayne
<chmaurer at iupui.edu> wrote:
> We have seen this periodically before, but never to the extent that we have
> for this start of semester.
> What is happening is that folks start out on one server in our cluster and
> the load balancer decides that that node is too busy and sends them over to
> a different node.  For "normal" navigation activity, it's not really a big
> deal.  It does become a big deal when they are in the middle of taking an
> assessment, or posting an announcement or something like that.  As far as
> the user knows, they hit submit and they expect that their transaction
> completed.  But it didn't, because they got sent to a new node.
> Do other institutions see these types of issues?  Just today we finally
> changed the setting to keep people locked to one server, so we're hoping
> that helps in a positive way.
> Thoughts from others?
> Chris
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Aaron Zeckoski - Software Architect - http://tinyurl.com/azprofile

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