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Date: Mon, 8 Feb 2010 09:38:03 -0800
Message-ID: <353769791002080938ke17994fp61b4a9b9f7bc95a@mail.gmail.com>
Subject: Re: Automatic scaling decisions based on performance metrics
From: anthonyvierra@gmail.com
To: Tomcat Users List <users@tomcat.apache.org>, pid@pidster.com
Content-Type: text/plain; charset=ISO-8859-1

Amazon EC2 has a scale feature that allows scaling based on
configuration of settings such as memory, processor, etc. Is this the
service your configuring?

On 2/8/10, Pid <pid@pidster.com> wrote:
> On 08/02/2010 13:05, Shashank Rachamalla wrote:
>> Hi
>>
>> I am currently involved in developing a module which performs automatic
>> scaling of application server instances based on their performance. I am
>> using JMX to pull data pertaining to server and underlying jvm on which
>> the applications are deployed. I can also collect performance data for
>> guest operating system.  We are using mod_jk as load balancer. The
>> challenging task here is to decide when to scale out and when to scale
>> in. Please suggest some strategies used to determine the load at a
>> cluster level based on which scaling decisions can be taken. Also can
>> any scaling decisions be taken by considering performance statistics of
>> a single instance in a cluster.
>
> Excellent!  This sounds like a great idea for an open source project.
> Where is it hosted?  I might be interested in contributing...
>
>
> p
>
>> The following are parameters currently monitored for each server
>> instance.
>>
>> Guest OS
>>
>> 1) CPU Usage
>> 2) Swap Usage
>>
>> JVM
>>
>> 1) JVM Free Memory
>>
>> App Server ( context is / )
>>
>> 1) Maximum Request Processing Time.
>> 2) Number of errors processing requests.
>> 3) Number of errors encountered while processing requests.
>>
>> Regards,
>> Shashank
>>
>>
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