Question 1

Should I use DynamoDB cross-region library or AWS Global Tables?

Accepted Answer

AWS Global Tables is the preferred server-side managed service for most use cases, reducing operational complexity. This library is better for custom client-side logic or when Global Tables aren't feasible, but it requires more hands-on management.

Question 2

How to set up multi-process replication for high throughput?

Accepted Answer

Launch multiple jar executables with the same taskName on different machines; the processes automatically coordinate via a DynamoDB checkpoint table to distribute work, as detailed in the advanced configuration section.

Question 3

What happens if the replication process stops?

Accepted Answer

Replication halts until the process is restarted, but it resumes from the last checkpoint using the DynamoDB checkpoint table. However, you must use external tools to ensure continuous uptime, as noted in the README.

Question 4

Can I replicate multiple tables with a single process?

Accepted Answer

No, each jar executable handles only one source-to-destination table pair. For multiple tables or replicas, separate processes are required, as explained in the replication scenarios.

Question 5

Does this library work with DynamoDB Local for testing?

Accepted Answer

Yes, you can override endpoints using command-line arguments like --sourceEndpoint to point to DynamoDB Local instances, enabling local testing setups without AWS cloud resources.

Question 6

How to monitor replication performance and logs?

Accepted Answer

The library publishes default CloudWatch metrics for records and bytes processed, and produces local logs via log4j. You can disable metrics with --dontPublishCloudwatch and use CloudWatch agents for log aggregation.

dynamodb-cross-region-library

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