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From "Imesh Gunaratne (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (STRATOS-112) Integrate Stratos with a CEP Engine in order to aggregate/summarize various events
Date Wed, 13 Nov 2013 01:56:18 GMT

     [ https://issues.apache.org/jira/browse/STRATOS-112?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Imesh Gunaratne updated STRATOS-112:
------------------------------------

    Fix Version/s:     (was: 4.0.0 M2)
                   4.0.0 M3

> 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 M3
>
>
> 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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