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From "Nirmal Fernando (JIRA)" <j...@apache.org>
Subject [jira] [Created] (STRATOS-112) Integrate Stratos with a CEP Engine in order to aggregate/summarize various events
Date Fri, 18 Oct 2013 14:02:41 GMT
Nirmal Fernando created STRATOS-112:
---------------------------------------

             Summary: Integrate Stratos with a CEP Engine in order to aggregate/summarize
various events
                 Key: STRATOS-112
                 URL: https://issues.apache.org/jira/browse/STRATOS-112
             Project: Stratos
          Issue Type: New Feature
            Reporter: Nirmal Fernando
            Assignee: Nirmal Fernando
            Priority: Critical
             Fix For: 4.0.0 M1


With the new architecture, real-time events such as in-flight requests of a load balancer,
health of a Cartridge instance etc. would get published directly to a Complex Event Processor
(CEP). It's the duty of the CEP to emit an aggregated version of the events it received, to
the reliable message broker so that auto-scaler could act upon the aggregated events.

So, what would be these aggregated events? Certainly it is not primitive as in-flight requests
count at a given time and also not to the extreme of deciding whether to spawn a new instance,
but some critical information, lies in between. Some examples would be,

    Average requests-in-flight count / load-average of an instance.
    Gradient of requests-in-flight / load-average of an instance.
    Second Derivative of requests-in-flight / load-average of an instance. (to detect whether
the gradient is increasing or decreasing over a time period)
    Summarize failed requests.
    Pattern detection.

etc.



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