dennisylyung opened a new pull request #12583: URL: https://github.com/apache/beam/pull/12583
DynamoDBIO.Write will throw a duplicate key error when write requests in the batch contains duplicate keys. An optional deduplication mechanism is added to avoid this error, taking reference from the implementation in [the official Python SDK of DynamoDB](https://github.com/boto/boto3/blob/develop/boto3/dynamodb/table.py). Changes to the ver1 module (beam-sdks-java-io-amazon-web-services) has been tested on an actual DynamoDB table with writes with duplicate keys. The job throws duplicate error if overwriteByPKeys are not specified, but ran successfully if the table's partition and sort keys are provided, as expected. Changes have been ported to the ver2 module (beam-sdks-java-io-amazon-web-services2), but not tested on an actual dynamodb table. It passed local unit tests as did v1. tests are updated to include provision of overwriteByPKeys, but a dedicated test for duplicate keys has not been written, since the mock dynamodb does not seem to throw on duplicate keys anyhow. 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