Microsoft Azure Developer Associate AZ-204 Practice Question
You are building a telemetry ingestion solution that uses an Azure Event Hubs Standard namespace with one event hub configured for four partitions and the default consumer group. An Azure Function app processes the stream. During peak traffic, the function logs QuotaExceededException errors that originate from Event Hubs throttling. You must eliminate the throttling without changing application code while keeping the Standard tier. What should you do?
Increase the number of partitions from four to eight.
Enable Event Hubs Capture to Azure Blob Storage.
Purchase additional throughput units for the namespace.
Add an additional consumer group to the event hub.
QuotaExceededException occurs when an Event Hubs namespace exceeds the throughput unit (TU) capacity that has been purchased for the Standard tier. Each TU entitles the namespace to 1 MB/s ingress, 2 MB/s egress, and up to 1,000 events per second. Adding consumer groups, enabling Capture, or increasing partitions does not change these limits. Increasing the number of partitions only spreads load across more partitions but the aggregate ingress/egress is still capped by the number of TUs. Capture is a storage feature and does not relieve throttling. Adding consumer groups affects parallel consumption, not throughput limits. Therefore, purchasing additional throughput units is the correct way to prevent the throttling while remaining on the Standard tier and requiring no code changes.
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What is a throughput unit (TU) in Azure Event Hubs?
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How does changing the number of partitions in Event Hubs impact performance?
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What is Event Hubs Capture, and why doesn’t it help with throttling?
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Microsoft Azure Developer Associate AZ-204
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