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
