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From Jonathan Zuckerman <j.zucker...@gmail.com>
Subject Re: [users@httpd] Re: Load balancing between different versions of a web application
Date Tue, 07 Jul 2009 01:04:36 GMT
On Mon, Jul 6, 2009 at 5:56 PM, Pranjal Thakur<pranjalt@gmail.com> wrote:
> I am using the apache mod_proxy load balancer:
> http://httpd.apache.org/docs/2.2/mod/mod_proxy_balancer.html
>
> I am not able to find any configuration change that I could make to achieve
> this.
> Here is the situation:
> my web application has 2 versions say N and N+1. N has 5 instances and N+1
> has 5 instances running on the same cloud.
> A user gets to an instance of N the first time. I want all the following
> requests from that user to go to any of the 5 instances of N and not go to
> any instance of N+1 at all.
>
>
> On Mon, Jul 6, 2009 at 7:26 PM, Jonathan Zuckerman <j.zuckerman@gmail.com>
> wrote:
>>
>> On Mon, Jul 6, 2009 at 1:49 PM, Pranjal Thakur<pranjalt@gmail.com> wrote:
>> > Hello,
>> > My problem is mentioned in the previous post (see below). I want to add
>> > that
>> > I cannot use sticky sessions as the cloud that hosts our sessions is
>> > fully
>> > clustered and so has the ability to send requests to a different server
>> > instance in case the current instance fails.
>> >
>> > let me know if there is a way to achieve this.
>> > thanks.
>> >
>> > On Mon, Jul 6, 2009 at 11:24 AM, Pranjal Thakur <pranjalt@gmail.com>
>> > wrote:
>> >>
>> >> This is more of a theoretical question.
>> >> I want to know if it is possible to do this:
>> >>
>> >> I have various versions of a web application, each running certain
>> >> number
>> >> of instances.
>> >> When a request comes in, it goes to a certain instance of some version.
>> >> I want the load balancer to now route further requests from this user
>> >> to
>> >> only the instances of the version it was first routed to.
>> >> I can maintain a cookie or some other way to save the version number of
>> >> the instance. But I need the load balancer to now take that into
>> >> consideration for further requests.
>> >> Is this possible and Is there any plugin available for this?
>> >>
>> >> Any help will be appreciated. thank you.
>> >
>> >
>>
>> Probably will need to contact whoever hosts your app for more info,
>> but theoretically I don't see why this can't be achieved, what type of
>> load balancer are you using?  I used netscaler briefly in the past and
>> it was infinitely configurable..
>>
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>
>

I've written a few APIs and we always include the version in the URL
somewhere (querystring, subdomain, whatever), so that new versions
won't break compatibility.  Is this an option?

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