Q1: Fastest Way to Aggregate Multi-Continent Data into One S3 Bucket

Problem Info

Domain	Design High-Performing Architectures
Services	Amazon S3, S3 Transfer Acceleration
Difficulty	Easy–Medium

Question

A company collects data for temperature, humidity, and atmospheric pressure in cities across multiple continents. Each site generates about 500 GB of data daily and has a high-speed internet connection. The company wants to aggregate the data from every global site into a single Amazon S3 bucket as quickly as possible, while keeping operational complexity to a minimum.

Which solution meets these requirements?

Correct Answer

Turn on S3 Transfer Acceleration on the destination S3 bucket, and use multipart uploads to send site data directly to it.

Why this is correct

Break the requirements down:

• Global sites, high-speed links → the bottleneck isn’t local bandwidth, it’s the long round-trip distance to a single regional S3 endpoint.
• “As fast as possible” → rules out slow/manual options like physical shipping.
• “Minimize operational complexity” → rules out building custom relay infrastructure.

S3 Transfer Acceleration solves exactly this. It routes uploads through the nearest CloudFront edge location and carries them over Amazon’s optimized backbone network to the bucket’s region, instead of over the public internet the whole way. AWS advertises accelerated transfers as 50–500% faster than a standard upload for long-distance transfers. You enable it with one setting on the bucket — no extra servers, no custom software — which is exactly the “least operational complexity” signal in the question.

Pairing it with multipart upload lets each 500 GB daily payload be split into parallel parts, uploaded concurrently, and reassembled in the bucket — improving throughput and resilience to individual part failures (only a failed part needs retrying, not the whole object).

Why the alternatives fall short

• Snowball / physical transfer devices — great for one-time bulk migrations (see Q6), but hopeless for a recurring daily 500 GB feed from many sites; the round-trip time defeats “as fast as possible.”
• Setting up Direct Connect per site — technically fast, but wildly high operational and cost overhead for dozens of remote sites; violates “minimize operational complexity.”
• Uploading directly to S3 without acceleration — works, but over long intercontinental distances the standard TCP path is slower and more variable than the accelerated path, especially for large daily payloads.

Exam Tip

Whenever you see “long-distance,” “multiple continents/regions,” or “partners uploading to our bucket” combined with “speed up”, think S3 Transfer Acceleration. If the scenario instead says “one-time,” “petabytes,” “no network,” or “limited bandwidth,” think Snowball/Snowmobile. Multipart upload is a complementary technique, not a competing answer — it’s almost always the right pairing for any large object upload to S3.