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Exam AZ-203 topic 3 question 17 discussion

Actual exam question from Microsoft's AZ-203

Question #: 17
Topic #: 3

Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.
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You are developing an Azure solution to collect point-of-sale (POS) device data from 2,000 stores located throughout the world. A single device can produce 2 megabytes (MB) of data every 24 hours. Each store location has one to five devices that send data.
You must store the device in Azure Blob storage. Device data must be correlated based on a device identifier. Additional stores are expected to open in the future.
You need to implement a solution to receive the device data.
Solution: Provision an Azure Event Hub. Configure the machine identifier as the partition key and enable capture.
Does the solution meet the goal?

A. Yes
B. No

Show Suggested Answer

Suggested Answer: A 🗳️
References:
https://docs.microsoft.com/en-us/azure/event-hubs/event-hubs-programming-guide

by nickbilak at June 14, 2020, 11:32 a.m.

Comments

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Larry616

Highly Voted 4 years, 10 months ago

Answer should be B-No Because total partitions has a max# of 32, but in the question it uses machine idetifier as partation key, there're 2000 * 5 = 10,000 machines here https://docs.microsoft.com/en-us/azure/event-hubs/event-hubs-features#partitions The number of partitions is specified at creation and must be between 2 and 32

upvoted 12 times

Brak

4 years, 5 months ago

Wrong. See my response above.

upvoted 1 times

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clarionprogrammer

4 years, 2 months ago

This is wrong. You're confusing Partition Keys with creating partitions.

upvoted 4 times

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Secure01

Highly Voted 4 years, 7 months ago

1. Partition Key is not mapped 1:1 to partition. 2. Store not accumulate data per each device. Each device send data separately. 3. 2MB per 24 hours are not sent at once. 4. Event Hub supposed to take events/messages from big amount of devices. 5. Event still a message (small one). You can put information you need to store in Blob. 6. To store message in Blob with Event Hub is easy. Just switch on capture setting.

upvoted 8 times

Brak

4 years, 5 months ago

Correct. Event Hub + Capture is a no-code solution that can scale.

upvoted 1 times

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meoukg

Most Recent 3 years, 3 months ago

Got it on 03/2022, I chose A. Yes

upvoted 2 times

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RahulKate

4 years, 5 months ago

Partitions - 2000 per CU - Dedicated Plan - So we can have 2K+ partitions in Event Hub Size allowed - Yes https://docs.microsoft.com/en-us/azure/event-hubs/event-hubs-dedicated-overview#event-hubs-dedicated-quotas-and-limits

upvoted 2 times

Esward

2 years, 4 months ago

Yes is the correct answer https://learn.microsoft.com/en-us/azure/event-hubs/event-hubs-dedicated-overview#event-hubs-dedicated-quotas-and-limits

upvoted 1 times

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ExamStudent123

4 years, 10 months ago

It is not Event Hub for the following reasons: - "The event data has information about what happened but doesn't have the data that triggered the event." https://docs.microsoft.com/en-us/azure/event-grid/compare-messaging-services - "Maximum size of Event Hubs event: 1 MB (standard)". From the question "A single device can produce 2 megabytes (MB) of data every 24 hours. Each store location has one to five devices that send data." That means the max size from one store could be 2MB to 10MB. Service Bus is correct for the following reasons: - "A message is raw data produced by a service to be consumed or stored elsewhere." - "Order processing and financial transactions" https://docs.microsoft.com/en-us/azure/event-grid/compare-messaging-services

upvoted 7 times

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godsbane

4 years, 12 months ago

Answer should be NO. https://azure.microsoft.com/es-es/blog/events-data-points-and-messages-choosing-the-right-azure-messaging-service-for-your-data/

upvoted 5 times

LTiwana

4 years, 11 months ago

In this like MS is talking about using device identity for partition key under Event Hub: The temperature sensors discussed earlier each emit a distinct stream that will be kept together using the Event Hub partitioning model, using the identity of the device as the partitioning key.

upvoted 1 times

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nickbilak

5 years ago

but, if we should transfer each sale from POS (not the entire daily batch at once), I'd go with Service Bus

upvoted 1 times

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nickbilak

5 years ago

scratch that, eventdatabatch.tryadd is not for service bus, but for event hub. SB has 256K limit. then the right solution could be event grid triggered event for consumers upon blob upload, that event will have id/link to the blob with 2MB of POS data. Event hub can have only up to 32 partitions, so answer A has no sense.

upvoted 2 times

Brak

4 years, 5 months ago

32 is the limit for physical partitions. Each device id is hashed to choose a physical partition.

upvoted 1 times

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nickbilak

5 years ago

I think Service Bus is correct as it's used for financial transactions (with guaranteed delivery) and allows batches up to 4MB - https://docs.microsoft.com/en-us/dotnet/api/microsoft.servicebus.messaging.eventdatabatch.tryadd?view=azure-dotnet#remarks

upvoted 5 times

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nickbilak

5 years ago

The event hub message size limit is 1MB. How can be answer A be correct, if the requirement is 2MB of data?

upvoted 2 times

LTiwana

4 years, 11 months ago

But the question mentions 2MB data every 24 hours and doesn't specify if the data needs to batched or streamed (Event Hub accepts both). It's confusion, but the answer might be correct. Here is a good comparison between the three services: https://docs.microsoft.com/en-us/azure/event-grid/compare-messaging-services

upvoted 6 times

rrongcheng

4 years, 11 months ago

I think it's Yes. In this linked doc, it gives an example at the end. The example use Event hubs to 'Capture file' to Storage, and then 'Capture event' to next step.

upvoted 3 times

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