Custom scaling algorithms

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Srinivasan Subramanian

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Feb 10, 2012, 11:55:21 AM2/10/12
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given our webapp is based on Jboss I am thinking of setting up custom scaling conditions based on metrics like JVM memory demand etc.

Any pointers to how this could be achieved?

One idea is to use zabix to monitor? How would I use those metrics from scalr? Iam a little lost here. Any help appreciated.

Thanks
Srini
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Surat Singh Bhati

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Feb 10, 2012, 12:58:38 PM2/10/12
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Srini,

Just in case you don't want to change the code, workaround is to use URLResponse time scaling option. You can write custom script on server, that can change the URL response time based on whatever criteria you want to check. 

-Surat 



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Sebastian Stadil

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Feb 10, 2012, 1:46:21 PM2/10/12
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Write a script that fetches this information from Jboss and outputs an integer, then create a custom scaling metric for it. Set the path to that script in the custom metric, choose the 'execute' option (instead of 'read'). Then you can set scaling thresholds for it.

Val

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Apr 24, 2012, 6:15:23 PM4/24/12
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I am posting to this thread because my question is still on the topic of Custom Scaling Algorithms.

I wrote a script that fetches the number of claimed slots from my batch queues and placed it on my worker nodes in the farm.  I then wrote a "File-Execute" custom scaling metric and gave it the path to my script on the worker nodes.  When the scaling cron runs it returns zero for my custom metric. I have confirmed that the script is not run on the worker nodes. Am I doing this correctly? If so, could it be a configuration problem with my scalr installation?  

Any clues would be most appreciated.

-Val

Robin Piedeleu

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May 1, 2012, 1:05:14 PM5/1/12
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Hello Val,

Sorry it took so long to get back to you. What version of the Scalr agent (scalarizr) are you running? There was an issue that was fixed a few weeks ago.

Regards,

Robin

Val

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May 1, 2012, 11:24:06 PM5/1/12
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Robin,
I have the following installed on Centos 5.7

scalarizr-base.noarch                                           0.7.220-1.el5                                     installed
scalarizr-ec2.noarch                                            0.7.220-1.el5                                     installed

Igor Savchenko

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May 2, 2012, 12:55:40 AM5/2/12
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And custom scaling metrics still doesn't work?

Regards,
Igor
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Val

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May 2, 2012, 2:06:41 AM5/2/12
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On Friday, February 10, 2012 8:55:21 AM UTC-8, Srini wrote:

Val

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May 2, 2012, 7:16:29 PM5/2/12
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I finally got custom scaling to work.  Here is what I needed to do:

  1. Restart the scalarizr after I updated it
  2. Set the Client account to isactive =1.  I did this manually in the mysqldb
I also found that every time I modified my custom scaling metric script on the nodes that the scalarizr needed to be restarted for the changes to be reflected. Another sticking point was that the executed metric script could not have a new line at the end of the file.

Sebastian Stadil

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May 2, 2012, 7:27:38 PM5/2/12
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Haha, yes. Client isactive is how we track paying customers in the hosted service. We should probably change the default for new accounts created to be active.

We're adding this to the documentation.

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Srinivasan S

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May 2, 2012, 9:46:43 PM5/2/12
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Hey Val

Any chance you can document the steps on the wiki with a sample scaling script? Will be a big help.

Cheers
Srini
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From: Val <vche...@lbl.gov>
Date: Wed, 2 May 2012 16:16:29 -0700 (PDT)
Subject: Re: Custom scaling algorithms
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Val

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May 3, 2012, 11:13:00 PM5/3/12
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Absolutely!  


On Wednesday, May 2, 2012 6:46:43 PM UTC-7, Srini wrote:
Hey Val

Any chance you can document the steps on the wiki with a sample scaling script? Will be a big help.

Cheers
Srini
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From: Val <vche...@lbl.gov>
Date: Wed, 2 May 2012 16:16:29 -0700 (PDT)

Val

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May 14, 2012, 5:36:38 PM5/14/12
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I have discovered what I think to be a bug with the "File-execute" custom scaling metric.  The file is executed once and returns the correct value. However, the subsequent times the cron job is run it still returns the original value no matter if that value has indeed changed.  The only way to force the correct value to be return is to restart the scalarizr on all the nodes with the scaling metric.  What am I missing?

-Val

Sebastian Stadil

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May 14, 2012, 5:39:38 PM5/14/12
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Sounds like a bug. Igor?

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Igor Savchenko

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May 14, 2012, 11:44:23 PM5/14/12
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That was fixed on scalr.net and will be available on OS version within the next release.

Regards,
Igor

Val

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May 15, 2012, 1:24:52 PM5/15/12
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What is the time frame for the next release? This is a key feature for us.

Sebastian Stadil

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May 15, 2012, 2:33:57 PM5/15/12
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As soon as we finish stabilizing some features, the next stable build will be released. I'm thinking about a week.

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Val

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May 25, 2012, 3:15:09 PM5/25/12
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I have confirmed that this is a but with both File-Execute and File-Read
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