As in the title, Java SDK for DynamoDB library used by YCSB is supported only by the end of the year (https://aws.amazon.com/blogs/developer/announcing-end-of-support-for-aws-sdk-for-java-v1-x-on-december-31-2025/) and migration to AWS SDK for Java v2.x is recommended.
This pull request #3 (and original github.com/brianfrankcooper/pull/1624) are still not merged.
Migrated to Jira: QATOOLS-2