title: How to Process Multiple Related Files uploaded to s3 as one group using aws Lambda
body: <p>I have multiple related files being uploaded to S3 bucket as group, which I want to process using aws Lambda. For examples externaly, inventory.txt, orders.txt, order_details.txt are received in one folder in s3 bucket. These are part of one batch. Someone else will send the same files in another folder in the same bucket.
  I want to process these files(cleanse,combine, etc) at the same time (so 3 files at the same time) as a batch.</p>
  
  <p>I have dabbled with Lambda, on S3 create object event level but it gets triggered for each file being uploaded. I want the lambda to trigger for the 3 files (and for the additional 3 files in another directory if applicable).</p>