Azure Event Grid Partner Topic for Thousands of Customers?

AZ-204 By islever Editorial Last updated

Develop event-based solutions

Short answer

B Publishing events to a partner topic fails because it cannot support the required thousands of event subscriptions.

Question

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. After you answer a question in this section, you will NOT be able to return to it. As a result, these questions will not appear in the review screen. You are implementing an application by using Azure Event Grid to push near-real-time information to customers. You have the following requirements: • You must send events to thousands of customers that include hundreds of various event types. • The events must be filtered by event type before processing. • Authentication and authorization must be handled by using Microsoft Entra ID. • The events must be published to a single endpoint. You need to implement Azure Event Grid. Solution: Publish events to a partner topic. Create an event subscription for each customer. Does the solution meet the goal?
  1. Yes
  2. No Correct Answer

Key Takeaways

Partner topics are restricted by subscription limits (500 per topic) and cannot handle thousands of customers; Event Domains are required for multi-tenant routing at scale.

Publishing events to an Azure Event Grid partner topic fails to meet the goal of routing events to thousands of customers due to subscription limits. The correct architectural choice for this scenario is an Event Domain, which supports massive subscription counts and a single publishing endpoint.

Common mistake: Choosing Yes because partner topics sound like they handle partner/customer routing, ignoring the hard quota limits on event subscriptions per topic.

Expert Analysis

Why the Answer Is Correct

The correct answer is "No" because a partner topic is subject to Azure Event Grid quota limits, specifically a maximum of 500 event subscriptions per topic. The requirement explicitly states the need to send events to thousands of customers, which translates to thousands of event subscriptions. Partner topics are designed for SaaS providers to broadcast events to Azure subscribers, but they lack the scale required for this specific requirement.

Why the Other Options Are Wrong

Option A ("Yes") is incorrect because it assumes a partner topic can handle thousands of individual customer subscriptions, which violates Azure's service quotas. Furthermore, partner topics are intended for SaaS-to-Azure integrations, not for an application pushing near-real-time information to thousands of its own customers. The architecture that actually meets these requirements is an Event Domain, which provides a single endpoint and can manage thousands of topics and subscriptions.

Community Comment Notes

Community members correctly point out that a partner topic cannot meet the goal due to subscription limits, as overhill noted, "Partner topics doesn't support thousands of subscriptions. only 100 per Azure Subscription". Raymond_abcd also highlighted that "The only possible solution is an event domain" because custom and partner topics are limited to 500 subscriptions. Robertical clarified the purpose of partner topics, stating they are for a "customer to send events to another system or application", which doesn't fit this scenario.

Official Reference

https://learn.microsoft.com/en-us/azure/event-grid/quotas-limits

This link opens the official vendor documentation in a new tab.

Exam Strategy

For Event Grid questions requiring a single endpoint for thousands of customers or topics, immediately identify Event Domains as the solution. Be aware of Event Grid quotas, such as the 500 subscription limit per custom or partner topic.

Community Votes

B
82%
A
18%

82% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 9 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 9

  1. raymond_abcd 👍 3 Answered B
    The only possible solution is an event domain, not a custom topic. Because a custom topic is limited to 500 subscriptions. Which does not meet the requirement.
  2. robertical 👍 2 Answered B
    No. Partner topic is for customer to send events to another system or application. "This feature also enables customers to send events to partner systems that support receiving and routing events to customer's solutions/endpoints in their platform. Typically, partners are software-as-a-service (SaaS) or ERP providers, but they might be corporate platforms wishing to make their events available to internal teams." https://learn.microsoft.com/en-us/azure/event-grid/partner-events-overview
  3. emysa341 👍 1 Answered A
    https://github.com/MicrosoftDocs/azure-docs/blob/main/articles/event-grid/partner-events-overview-for-partners.md#:~:text=You%20want%20a%20mechanism%20to%20make%20your%20events%20available%20to%20your%20customers%20on%20Azure.%20Your%20users%20can%20filter%20and%20route%20those%20events%20by%20using%20partner%20topics%20and%20event%20subscriptions%20they%20own%20and%20manage.%20You%20could%20use%20other%20integration%20approaches%20such%20as%20topics%20and%20domains.
  4. overhill 👍 1
    Partner topics doesn't support thousands of subscriptions. only 100 per Azure Subscription https://learn.microsoft.com/en-us/azure/event-grid/quotas-limits
  5. james2033 👍 1 Answered B
    The question is wrong. Change 'partner topic' to 'custom topic' . With 'custom topic', it did not meet the goal, need 'event domain'
Show 4 more comments
  1. 4cca361 👍 1
    Solution B. We should create Event Subscriptions with Filtering not just Event Subscriptions
  2. 4d6c887 👍 1 Answered B
    I don't think that parter topic si correct. Should be custom topic.
  3. dom271219 👍 2 Answered B
    No. It sould be custom topic.
  4. Ciupaz 👍 1 Answered A
    Yes is the correct answer.

Reader comments & corrections

No reader corrections yet — spotted an error or have a note? Share it below.

Log in to comment, report an error, or add a note about this question.

Submitted for moderation before publishing. Keep it helpful and respectful.

How Do You Mitigate Azure Cache for Redis Maintenance Performance Issues?

S-grade

Azure Service Bus FIFO Processing Order

S-grade

How Do You Increase Read Cache in Azure Cache for Redis?

S-grade

Which Cosmos DB consistency level avoids out-of-order writes in multi-region reads?

S-grade

← Back to AZ-204 Study Guide