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Exam AZ-300 topic 2 question 5 discussion

Actual exam question from Microsoft's AZ-300

Question #: 5
Topic #: 2

HOTSPOT -
You are developing a back-end Azure App Service that scales based on the number of messages contained in a Service Bus queue.
A rule already exists to scale up the App Service when the average queue length of unprocessed and valid queue messages is greater than 1000.
You need to add a new rule that will continuously scale down the App Service as long as the scale up condition is not met.
How should you configure the Scale rule? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
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by wlfjck at Jan. 2, 2020, 5:24 a.m.

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Ekramy_Elnaggar

Highly Voted 5 years, 6 months ago

1) Service Bus queue 2) Message count 3) Average 4) Less than or Equal to 5) Decrease Count by

upvoted 67 times

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AnshMan

Highly Voted 5 years, 1 month ago

This is the Order: 1]Service Bus Queue 2] Active Message Count 3] Average (Grain statistics) (You will not have COUNT) 4] Less than or equal to 5] Decrease count by Average queue length means w.r.t to the number of instances and valid queue messages means "Active Messages". https://blog.tomkerkhove.be/2017/10/16/autoscaling-your-platform-with-azure-monitor/ https://docs.microsoft.com/en-us/azure/azure-monitor/platform/autoscale-best-practices#considerations-for-scaling-threshold-values-for-special-metrics

upvoted 25 times

Shunya

4 years, 12 months ago

Agree to your answer

upvoted 1 times

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Juanlu

4 years, 4 months ago

Totally Agree !

upvoted 1 times

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Prash85

Most Recent 5 years ago

Box 3 is Average not count.

upvoted 6 times

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kondapaturi

5 years ago

Box 1: Service bus queue - Box 2: ActiveMessage Count - Box 3: Count - Box 4: Less than or equal to - Box 5: Decrease count by -

upvoted 4 times

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kondapaturi

5 years ago

complete question - https://vceguide.com/how-should-you-configure-the-scale-rule/

upvoted 7 times

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AnujD

5 years, 1 month ago

It should be 'ActiveMessageCount' as that would be the actual 'unprocessed' message count.

upvoted 5 times

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Rishabhjain

5 years, 2 months ago

since the scale out rule mentions Valid message, the scale in rule should also include Active Message Count, rather than Message count which will include dead lettered messaged. https://docs.microsoft.com/en-us/azure/service-bus-messaging/message-counters

upvoted 13 times

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Karen_12321

5 years, 3 months ago

And why average instead of total?

upvoted 1 times

Yannor

5 years, 3 months ago

Because it says "A rule already exists to scale up the App Service when the average queue length of unprocessed and valid queue messages is greater than 1000."

upvoted 14 times

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magpi

4 years, 9 months ago

Because the count is already done by "Active message count". If you select count, you are counting the number of signals coming from that metric. So, if azure decide to assess this rule, it will pick several signals from that metric (e.g. 1250, 1000,1100, and 900) the counting would be 4 (I'm not sure how many signals Azure pick), the total would be the sum 1250+1000+1100+900, and the average the answer you are looking for.

upvoted 2 times

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wlfjck

5 years, 6 months ago

Shouldn't be ActiveMessage? As MessageCount include deadletter and transfered

upvoted 22 times

tartar

4 years, 9 months ago

Service Bus Queue Active Message Count Average COUNT Less than or equal to Decrease count by

upvoted 11 times

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