AWS - Serverless Architecture
In a Lambda function triggered by DynamoDB Streams, how can you ensure that only records with the event type 'MODIFY' are processed, ignoring 'INSERT' and 'REMOVE' events?
In a Lambda function triggered by DynamoDB Streams, how can you ensure that only records with the event type 'MODIFY' are processed, ignoring 'INSERT' and 'REMOVE' events?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand event filtering
DynamoDB Streams send all events (INSERT, MODIFY, REMOVE) to Lambda by default.Step 2: Implement event type check in Lambda
Within the Lambda handler, checkrecord['eventName']and process only if it equals 'MODIFY'.Step 3: Evaluate other options
Process all records without checking event type, then filter in downstream logic processes all events unnecessarily; Use a DynamoDB Stream filter to exclude 'INSERT' and 'REMOVE' events before Lambda invocation is not supported natively; Configure the Lambda trigger to only invoke on 'MODIFY' events in the AWS Console is not configurable in AWS Console.Final Answer:
Check ifrecord['eventName'] == 'MODIFY'before processing each record -> Option CQuick Check:
Event filtering must be done in code [OK]
Quick Trick: Filter events inside Lambda by checking eventName [OK]
Common Mistakes:
- Assuming AWS Console can filter stream events by type
- Processing all events without filtering
- Expecting DynamoDB Streams to send only MODIFY events
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