DEA-C01 Data Operations and Support Practice Question

Correct answer & explanation

Configuring a Dead Letter Queue (DLQ) for the Kinesis Data Firehose delivery stream allows failed records to be captured and stored for later analysis and reprocessing. While Firehose automatically retries delivery, persistent failures can lead to data loss. A DLQ (or error backup destination) ensures that records that cannot be delivered are preserved. Option A: Decreasing the buffer interval from 60 to 30 seconds would cause more frequent deliveries, increasing the likelihood of transient failures affecting smaller batches and not reducing overall data loss. Option B: Increasing the buffer size to 10 MB does not prevent data loss; it only changes the threshold for flushing data. Since the data rate is 2 MB/min, the buffer size is rarely the trigger (interval is more likely). Option D: Enabling data transformation with AWS Lambda to compress data reduces the size of records but does not address delivery failures; it could even introduce additional failure points from the Lambda function. Thus, only C directly addresses data loss by capturing failed records.