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Learn how to download large files from AWS S3 and compress them into `ZIP` files without causing memory overflow. This guide provides step-by-step methods to stream and manage large file zipping efficiently.
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Managing Large File Compression with AWS S3: A Guide to Creating ZIP Files in Chunks

The challenge of downloading large files from AWS S3 and compressing them into a single ZIP file has become increasingly important, especially in serverless setups where memory and storage limitations need to be carefully navigated. Imagine having an S3 bucket containing files of several gigabytes, and needing to provide clients the ability to download all these files in a zipped format without overloading your server’s resources.

In this guide, we will explore how to approach this problem successfully, discussing how you can chunk files during download, create ZIP files incrementally, and handle streaming directly to the client.

Understanding the Problem

Let’s say you have the following files stored in your S3 bucket:

file1: 2GB

file2: 3GB

file3: 1.9GB

file4: 5GB

The goal is to allow users to download all files as a single ZIP while ensuring that:

You do not load all files into memory.

You do not require extensive disk storage on your server.

The process remains efficient and seamless.

Proposed Solution Overview

To achieve the above goal, you can follow a series of organized steps as outlined below:

Initiate a multipart upload job on S3.

Download each file from S3 in chunks to avoid memory overflow.

Compress the downloaded chunks into a zip file while streaming.

Finish the multipart job once the compression is complete, or stream the file directly to the user.

Step-by-Step Breakdown

Step 1: Start the Multipart Upload on S3

Using the boto3 library, you will first need to initiate a multipart upload job to S3 to start uploading the zipped chunks.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Download Each File in Chunks

You’ll want to use a method that reads files in chunks. This prevents excessive memory use and allows for better control over the process.

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Compressing Chunks into the ZIP File

In Python, you can make use of the zipfile module while creating a custom stream class to manage the data flow:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Streaming the Final ZIP File

Once the ZIP file is ready, you can either upload it back to S3 or stream the file directly to the client, avoiding any unnecessary storage.

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

This approach allows you to efficiently download large files from AWS S3, compress them into ZIP files without overwhelming memory, and directly stream content to clients. While implementing this solution may seem daunting due to complexities surrounding file handling and streaming, breaking it down into manageable steps makes it tractable and effective.

Final Thoughts

Always remember to test your implementation, as handling large datasets can introduce unforeseen challenges. Additionally, consider using AWS services like CloudFront for improved data handling if the files were smaller. Happy coding!