svn commit: r1596162 - /incubator/stratos/site/trunk/content/about/why-apache-stratos.mdtext

[ma...@apache.org]

Author: madhura
Date: Tue May 20 09:28:57 2014
New Revision: 1596162

URL: http://svn.apache.org/r1596162
Log: (empty)

Modified:
    incubator/stratos/site/trunk/content/about/why-apache-stratos.mdtext

Modified: incubator/stratos/site/trunk/content/about/why-apache-stratos.mdtext
URL: http://svn.apache.org/viewvc/incubator/stratos/site/trunk/content/about/why-apache-stratos.mdtext?rev=1596162&r1=1596161&r2=1596162&view=diff
==============================================================================
--- incubator/stratos/site/trunk/content/about/why-apache-stratos.mdtext (original)
+++ incubator/stratos/site/trunk/content/about/why-apache-stratos.mdtext Tue May 20 09:28:57 2014
@@ -46,4 +46,10 @@ Notice:    Licensed to the Apache Softwa
 <h2>Predicting future loads</h2>
 <p>Another important capability of Apache Stratos is predicting immediate future load, based on current health statistics. All cartridges, Load balances, health monitors are publishing health status into CEP (Complex Event Processor) via real time event bus. CEP will aggregate all these events and calculate first derivative, second derivative for a given time window frame and paas resulting streams to Auto scaler via reliable message bus.</p>
 <p>Auto Scaler used motion equation to get immediate (next minute) future load.</p>
-<span>s = ut+ 1/2 at<sup>2</sup></span>
\ No newline at end of file
+<span>s = ut+ 1/2 at<sup>2</sup></span>
+<ul>
+<li>S = predicted load</li>
+<li>u  = first derivative (eg. first derivative of current load average)</li>
+<li>t  = time interval (eg. one minute)</li>
+<li>a  = second derivative (eg. second derivative of current load average)</li>
+</ul>
\ No newline at end of file