Question: Can Amazon Data Firehose write to DynamoDB?

Answer

Amazon Data Firehose does not provide DynamoDB as a native delivery destination. Its built-in destinations include services such as S3, Redshift and OpenSearch, plus supported third-party and HTTP endpoints.

If your producer uses Kinesis Data Streams, attach a Lambda consumer that writes to DynamoDB. If queued processing fits better, use SQS with a worker or Lambda function. In either design, map each record to a stable item key, validate it and handle retries without creating duplicate business effects.

BatchWriteItem can group independent puts and deletes, but it is not atomic and can return unprocessed items. Retry those items with backoff. Use conditional writes or transactions when ingestion must enforce uniqueness or other invariants.

You can build a Firehose HTTP destination that receives batches and writes to DynamoDB, but that is a custom integration. You own the endpoint's acknowledgment behavior, capacity, authentication and retry handling; selecting an HTTP destination does not turn DynamoDB into a supported direct target.

The reverse direction is different: DynamoDB changes can flow through Kinesis Data Streams and then Firehose for analytics delivery. See Streams vs Kinesis and batch writes.

Source: Firehose destination list.