Use S3 Batch Operations replication to retry objects that failed to replicate

DOP-C02 By islever Editorial Last updated Oct 7, 2026

Implement automated recovery processes to meet RTO and RPO requirements. Design and build automated solutions for complex tasks and large-scale environments.

Short answer

D Use an S3 Batch Replication job to retry replication for objects that failed to replicate.

Question

A company deploys an application to two AWS Regions. The application creates and stores objects in an Amazon S3 bucket that is in the same Region as the application. Both deployments of the application need to have access to all the objects and their metadata from both Regions. The company has configured two-way replication between the S3 buckets and has enabled S3 Replication metrics on each S3 bucket. A DevOps engineer needs to implement a solution that retries the replication process if an object fails to replicate. Which solution will meet these requirements?

Create an Amazon EventBridge rule that listens to S3 event notifications for failed replication events. Create an AWS Lambda function that downloads the failed replication object and then runs a PutObject command for the object to the destination bucket. Configure the EventBridge rule to invoke the Lambda function to handle the object that failed to replicate.
Create an Amazon Simple Queue Service (Amazon SQS) queue. Configure S3 event notifications to send failed replication notifications to the SQS queue. Create an AWS Lambda function that downloads the failed replication object and then runs a PutObject command for the object to the destination bucket. Configure the Lambda function to poll the queue for notifications to process.
Create an Amazon EventBridge rule that listens to S3 event notifications for failed replications. Create an AWS Lambda function that downloads the failed replication object and then runs a PutObject command for the object to the destination bucket.
Create an AWS Lambda function that will use S3 batch operations to retry the replication on the existing object for a failed replication. Configure S3 event notifications to send failed replication notifications to the Lambda function. Correct Answer

Key Takeaways

S3 Batch Replication exists specifically to retry failed replications, producing a manifest of failed objects and re-replicating them, which is exactly the requirement (D). Option A wires EventBridge to a Lambda that downloads and re-Puts the failed object, but S3 does not emit an EventBridge event for replication failures, so the trigger described does not exist; option B routes notifications through SQS with the Lambda polling, adding queue infrastructure for the same manual re-Put logic.

With two-way S3 replication configured and replication metrics enabled, the requirement is to retry replication for objects that failed. Amazon S3 Batch Operations provides a dedicated Batch Replication capability that generates a replication manifest for objects that previously failed to replicate and re-replicates them in batches, which is the purpose-built retry mechanism. A Lambda plus EventBridge or SQS would have to reimplement the retry logic and would still have to identify failed objects.

Common mistake: Building an EventBridge rule that listens for S3 replication failure events (A and C)—S3 does not publish replication failure events to EventBridge, so the trigger would never fire; this was the decisive objection raised against option A. Polling an SQS queue with a Lambda that re-Puts the object (B)—it re-creates the retry logic manually and requires the queue to be polled, whereas the built-in operation handles manifest generation and retries.

Expert Analysis

Why the Answer Is Correct

Amazon S3 Batch Replication is an S3 Batch Operations job type built specifically for this situation: it creates a replication manifest covering objects that existed before replication was configured, objects already replicated, and objects that failed to replicate, then re-replicates them. That is precisely the requested retry of failed replications, and it is a native, managed operation rather than custom code, which also aligns with the stated use of replication metrics.

Why the Other Options Are Wrong

A and C both propose an EventBridge rule that listens for S3 event notifications for failed replications. S3 does not emit an EventBridge event for replication failures, so no such event would ever trigger the rule, and C additionally omits the step that invokes the Lambda. B routes the notifications through an SQS queue and has a Lambda poll it and re-Put the object, which reimplements the retry manually and adds a queue to operate. D is the purpose-built choice.

Community Comment Notes

Community voted D (85), with A a 15 percent minority. Commenters quoted the AWS documentation that S3 Batch Replication replicates objects that existed before replication was configured, objects previously replicated, and objects that failed to replicate. One commenter favored A for being streamlined, but the mechanism it depends on does not exist.

Official Reference

https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-batch-replication-batch.html

This link opens the official vendor documentation in a new tab.

Community Votes

85%

15%

85% of anonymous learners picked answer D. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 8 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 8

r4nd0m1z3r 👍 6 Answered D

S3 Batch Replication provides you a way to replicate objects that existed before a replication configuration was in place, objects that have previously been replicated, and objects that have failed replication. https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-batch-replication-batch.html
L1_ 👍 5 Answered D

This post suggests D: https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-batch-replication-batch.html
iulian0585 👍 4 Answered D

By using S3 Batch Replication, you can replicate the following types of objects: Objects that existed before a replication configuration was in place Objects that have previously been replicated Objects that have failed replication
c3518fc 👍 3 Answered D

S3 Batch Replication provides you a way to replicate objects that existed before a replication configuration was in place, objects that have previously been replicated, and objects that have failed replication. This is done through the use of a Batch Operations job. https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-batch-replication-batch.html
WhyIronMan 👍 3 Answered D

D, https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-batch-replication-batch.html

Show 3 more comments

xdkonorek2 👍 2 Answered D

100% D S3 Batch Replication is one of actions provided by S3 batch operations https://docs.aws.amazon.com/AmazonS3/latest/userguide/batch-ops-operations.html batch operations can be used for objects that failed replication https://docs.aws.amazon.com/AmazonS3/latest/userguide/s3-batch-replication-batch.html#:~:text=Objects%20that%20have%20failed%20replication
Srikantha 👍 1 Answered A

Option A provides the most efficient and streamlined solution by using EventBridge and Lambda to automatically retry replication failures
CloudHell 👍 3 Answered A

It's A for me.

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