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Date: Tue, 16 Sep 2008 22:20:01 +0200
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To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: Balance and sync data
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Martin Spinassi wrote:
> On Tue, 2008-09-16 at 08:56 -0700, Hassan Schroeder wrote:
>> On Tue, Sep 16, 2008 at 8:17 AM, Martin Spinassi
>> <martins.listz@gmail.com> wrote:
>>
>>>> Why not have your upload servlet invoke rsync when a new file has
>>>> been stored?
>>> Can you give me some more details or where to get some more info?
>> Runtime.exec("/usr/bin/rsync")  -- though you may want to instead
>> invoke a script file containing the appropriate rsync arguments.
>>
>> This works fine. I've even used rsync's "dry-run" mode to create a list
>> of files that differed between two systems (e.g. staging and production)
>> to generate a form page and allow the user to pick which ones to sync.
>>
>> HTH,
> 
> Thanks Hassan!
> 
> I'll talk to developers to give it a try at our test environment.
> 
> 
The question I've been holding back since your initial post, is why 
exactly you do want to load-balance similar requests to 2 Tomcats ?

Just an idea :

If it is because you have a) "image stuff" and b) "non-image stuff", and 
they each represent about 50% of the load, then maybe you do not really 
want to balance (with the problems of sharing and/or duplicating the 
images), but you could just use a front-end to split the image stuff and 
send it to Tomcat-1, and the non-image stuff and send it to Tomcat-2.
(Apache + mod_rewrite + mod_proxy).
This way, only Tomcat-1 would need to handle the images (up and down) 
and it would always be up-to-date.


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