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Learn how to use `boto3` to effectively retrieve files stored in the S3 Glacier Instant Retrieval storage class. This guide solves common errors and provides a clear code example.
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Retrieving S3 Glacier Instant Retrieval Objects with Boto3

When working with AWS S3, many developers use different storage classes to optimize costs and access speeds. One such storage class is S3 Glacier Instant Retrieval (GLACIER_IR), which is designed for objects that are rarely accessed but still need to be retrieved quickly. However, a common challenge arises: how to correctly retrieve objects stored in this class using boto3, the Amazon Web Services (AWS) SDK for Python.

In this guide, we will describe how to perform this retrieval process smoothly and resolve common errors that you might encounter, like the infamous ObjectNotInActiveTierError.

The Problem: Object Not in Active Tier

You may have successfully stored an object into the GLACIER_IR storage class, but when attempting to retrieve it, you might encounter an error indicating that the object is not in the active tier:

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This error occurs because GLACIER_IR objects are not instantly available for reading or copying until they have been restored first. Fortunately, the solution is straightforward once you know the correct steps to follow.

Solution: Using boto3 to Restore and Retrieve the Object

To retrieve an object stored in the S3 Glacier Instant Retrieval class, follow these steps:

Step 1: Restore the Object

First, you need to initiate the restoration of the object from the GLACIER_IR storage class. This allows AWS to make a copy of the data available for access.

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Bucket: The specific bucket where your GLACIER_IR object is stored.

Key: The key for the object you want to restore.

RestoreRequest: This specifies how long you want the object to be available once restored (in this case, 1 day).

Step 2: Wait for the Restoration

After initiating the restoration request, it may take some time for AWS to complete it. Use a waiter to check for the object's existence before attempting to copy it.

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Step 3: Copy the Object

Once the object is confirmed to be restored, you can now copy it to the desired destination bucket. Be sure to reference the same copy_source you used to restore the object.

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Complete Code Example

Here’s how the complete code looks with all the steps integrated:

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Conclusion

Retrieving files from the S3 Glacier Instant Retrieval storage class using boto3 requires a two-step approach: first, restoring the object, and then copying it to your desired destination. By following the provided steps, you can avoid common pitfalls and ensure smooth retrieval of your data.

Feel free to use this guide not only as a quick reference but also to share with others who may encounter the same issue. Happy coding!