AWS Glue Crawler Not Creating Table

Question

I have a crawler I created in AWS Glue that does not create a table in the Data Catalog after it successfully completes.

The crawler takes roughly 20 seconds to run and the logs show it successfully completed. CloudWatch log shows:

• Benchmark: Running Start Crawl for Crawler
• Benchmark: Classification Complete, writing results to DB
• Benchmark: Finished writing to Catalog
• Benchmark: Crawler has finished running and is in ready state

I am at a loss as to why the tables in the data catalog are not being created. AWS Docs are not of much help debugging.

Answer 1

check the IAM role associated with the crawler. Most likely you don't have correct permission.

When you create the crawler, if you choose to create an IAM role(the default setting), then it will create a policy for S3 object you specified only. if later you edit the crawler and change the S3 path only. The role associated with the crawler won't have permission to the new S3 path.

Answer 2

I had the same issue, as advised by others I tried to revise the existing IAM role, to include the new S3 bucket as the resource, but for some reason it did not work. Then I created a completely new role from scratch... this time it worked. Also, one big question I have for AWS is "why this access denied error due to a wrong attached IAM policy does not show up in Cloud watch log??" That makes it difficult to debug.