Autoscaling in Windows Azure

Question

Hi,

I'm trying to setup an autoscaling solution for my Azure apps. I've got it to react to constraintRules but just can't make it to react to reactiveRules.

I'm using diagnostics to log all the messages from the Autoscaling (using P&P autoscaling block) - so I can see that the autoscaler sees my reactive rules, but the target is not being identified. Such as this:

<TraceSource>Autoscaling General</TraceSource>
<Object>Rule match.
[BEGIN DATA]{"EvaluationId":"67281173-085f-49a1-95f8-0b9c50a4de7d","MatchingRules":[{"RuleName":"Default constraints for all roles","RuleDescription":"SLA rule","Targets":["JobsRole","RESTAPI","Web"]},{"RuleName":"scaleWebApi","RuleDescription":"Scale up when cpu average over 5%","Targets":[]},{"RuleName":"scaledownWebApi","RuleDescription":"Scale down when cpu avg under 5%","Targets":[]}]}</Object>

Where as the reactive rules are defined as:

<reactiveRules>
    <rule name="scaleWebApi" description="Scale up when cpu average over 5%" rank="2" enabled="true">
        <when>
            <any>
                <greater operand="RESTAPI_CPU_Avg" than="5" />
            </any>
        </when>
        <actions>
            <scale target="RESTAPI" by="1" />
        </actions>
    </rule>
    <rule name="scaledownWebApi" rank="2" enabled="true" description="Scale down when cpu avg under 5%">
        <when>
            <all>
                <lessOrEqual operand="RESTAPI_CPU_Avg" than="5" />
            </all>
        </when>

        <actions>
            <scale target="RESTAPI" by="-1" />
        </actions>
    </rule>
  </reactiveRules>

What could be the problem and how can I try and make sense out of it? :)

Many thanks, Roman

Answer 1

Hi,

I am trying to involve someone familiar with this topic to further look at this issue. There might be some time delay.
 
Appreciate your patience.

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Answer 2

Thank you :) Will wait patiently.

Answer 3

Hi Roman,

Patterns & practices – Enterprise Library has a community at http://entlib.codeplex.com/ where questions are being closely monitored and answered. I believe your questions about the Azure autoScalling block will be better answered there.

-Emma

Answer 4

Thank you Emma. Will do.