I'd go with B: real-time is requested, and the only scenario for real time (in the 4 presented) is the use of pub/sub with push.

D The need is to collate the messages in real-time. We need to de-dupe the messages based on timestamp of when the event occurred. This can be done by publishing ot Pub-Sub and consuming via Dataflow.

This is the most suitable solution for the requirements. Google Cloud Pub/Sub can handle high throughput and low-latency data ingestion. Coupled with Google Cloud Dataflow, which can process data streams in real time, this setup allows for immediate processing of bid events. Dataflow can also handle ordering and timestamp extraction, crucial for determining which bid came first. This architecture supports scalability and real-time analytics, which are essential for a global auction system.

the Answer should be D for the following Real-time Processing Centralized Processing Winner Determination also, B is unsuitable as While Pub/Sub can ingest data, Cloud SQL is a relational database not designed for real-time processing at this scale. Maintaining a custom endpoint adds complexity.

Google Cloud Pub/Sub is a scalable and reliable messaging service that can handle high volumes of data and deliver messages in real-time. By having each application server publish bid events to Cloud Pub/Sub, you ensure that all bid events are collected centrally. Using Cloud Dataflow with a pull subscription allows you to process the bid events in real-time. Cloud Dataflow provides a managed service for stream and batch processing, and it can handle the real-time processing requirements efficiently. By processing the bid events with Cloud Dataflow, you can determine which user bid first by applying the appropriate logic within your Dataflow pipeline. This approach ensures scalability, reliability, and real-time processing capabilities, making it suitable for handling bid events from multiple application servers.

B should be the answer, because it writes the bid into Cloud SQL to a distributed system. This way the customer know if they get the bid or not, immediately. Also, push requests are faster than pull requests, hence they are better for realtime experience.

pub/sub for entry time stamp + event time dataflow for processing and dataflow is better for real time

To accurately determine who bid first in a globally distributed auction application, utilizing a push mechanism instead of a pull mechanism is generally considered the more reliable approach. B should be correct answer.

key words is "single location in real time"

Answer : D We need to de-dupe the messages based on timestamp of when the event occurred. This can be done by publishing ot Pub-Sub and consuming via Dataflow. D sounds like a complete answer. B does not.

D. Have each application server write the bid events to Google Cloud Pub/Sub as they occur. Use a pull subscription to pull the bid events using Google Cloud. This approach leverages Google Cloud Pub/Sub for real-time data ingestion and Google Cloud Dataflow for real-time data processing, ensuring that bids are processed as they occur, which aligns with real-time requirements. It's not B because there is a step involving a custom endpoint that writes data into Cloud SQL. This additional step could introduce some latency, and it's important to ensure that the custom endpoint and Cloud SQL database can handle the real-time load effectively.

D. Have each application server write the bid events to Google Cloud Pub/Sub as they occur. Use a pull subscription to pull the bid events using Google Cloud Dataflow. Give the bid for each item to the user in the bid event that is processed first.

B. Have each application server write the bid events to Cloud Pub/Sub as they occur. Push the events from Cloud Pub/Sub to a custom endpoint that writes the bid event information into Cloud SQL. is correct

Correct Answer is B. option D is based on processing first and not based on event first. so option D cannot be right answer

D is the best solution because it is both real-time and scalable. Google Cloud Dataflow can process the bid events in the order in which they occurred and give the bid for each item to the user in the bid event that is processed first.

B.here is why Option B is like using special messaging balloons that quickly carry all the bids to a special spot. From there, a super-fast friend checks them and tells us who bid first. This way, we find out quickly! Option D is like having all the bids sent to a special magic box that quickly sends them to a smart computer friend. This friend looks at the bids right away and tells us who should get the toy based on who bid first. In conclusion, Option B (Cloud Pub/Sub and Cloud SQL) or Option D (Google Cloud Pub/Sub and Cloud Dataflow) are the most suitable choices for real-time processing of bids and determining the first bidder. They offer efficient, scalable, and real-time solutions for handling bid events in a globally distributed auction application. The final decision would depend on factors such as the specific requirements, infrastructure, and expertise of the development team.

B is correct, As push provides near-real time