Professional Data Engineer

By Google · Question Mode

QuestionQ62

Ingesting and processing the data

You have Node.js Cloud Functions that pull messages from Cloud Pub/Sub and write the data to BigQuery. You notice that the Pub/Sub topic’s message-processing rate is orders of magnitude higher than expected, with no error recorded in Cloud Logging. What are the two most likely causes of this issue?

Choose two
Explanation

Pub/Sub redelivers messages that are not acknowledged before the acknowledgment deadline. A subscriber that cannot keep pace can let acknowledgments expire, producing duplicate deliveries and potentially an escalating redelivery load. A subscriber that does not acknowledge pulled messages likewise causes repeated delivery of those messages.

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