AWS Glue Crawlers can now be started using Amazon S3 event notifications

AWS Glue includes crawlers, a capability that make discovering datasets simpler by scanning data in Amazon S3 and relational databases, extracting their schema and automatically populating the AWS Glue Data Catalog, which keeps the metadata current. This reduces the time to insight by making newly ingested data quickly available for analysis with your favorite analytics and machine learning tools.

Source:: Amazon AWS