Google Updated Professional-Data-Engineer Exam Questions and Answers by jonathan

 To update a streaming pipeline with improved business logic and reprocess the previous two days of delivered Pub/Sub messages, you should use Pub/Sub Seek with a timestamp and Pub/Sub Snapshot capture two days before the deployment. Pub/Sub Seek allows you to replay or purge messages in a subscription based on a time or a snapshot. Pub/Sub Snapshot allows you to capture the state of a subscription at a given point in time and replay messages from that point. By using these features, you can ensure that the updated pipeline can process the messages that were delivered in the past two days without losing any data. References:

Pub/Sub Seek

Pub/Sub Snapshot

To minimize the cost of storing and retrieving objects in a Cloud Storage bucket while ensuring that cost optimization efforts are transparent to the users and applications, enabling Autoclass is the best approach. Here’s why:

Autoclass Feature:

Autoclassautomatically transitions objects between different storage classes (Standard, Nearline, Coldline, and Archive) based on their access patterns.

It ensures that frequently accessed data is kept in lower-latency, higher-cost storage classes and infrequently accessed data is moved to higher-latency, lower-cost storage classes.

Cost Optimization:

Autoclass optimizes storage costs by automatically moving objects to the most cost-effective storage class based on actual usage patterns, without manual intervention.

This feature ensures that objects are stored in the most economical class appropriate for their access frequency, reducing storage costs over time.

Transparency to Users:

The transition of objects between storage classes is handled automatically by Cloud Storage, making the process transparent to users and applications.

Users and applications interact with the objects in the same way, regardless of the underlying storage class, ensuring seamless access.

Steps to Implement:

Create a Cloud Storage Bucket:

When creating a new Cloud Storage bucket, enable the Autoclass feature.

Configure Autoclass:

Autoclass configuration is typically a straightforward process in the Google Cloud Console, where you enable it during bucket creation.

Monitor and Adjust:

Monitor the storage and access patterns through the Google Cloud Console to ensure that Autoclass is optimizing costs as expected.

Reference Links:

Google Cloud Storage Autoclass

Optimizing Storage Costs with Autoclass