No CSV extension on Glue pyspark job in Amazon S3

Thanks Gonzalo, is there a way to change also naming convention of Glue for run-[timestamp]-part-r-[number} ?

I'd recommend looking at the logs for the job to find the root cause of the error. If the jobs did execute successfully, check to see you have the proper IAM permissions to be able to view the files in Amazon S3. But by starting with the logs, you'll be able to share a better picture of the status.

DynamicFrame doesn't add the extension for CSV; in big data the extension is optional because you normally work with folders.
The files you get under the destination folder with names like: run-[timestamp]-part-r-[number} are csv even if they have no extension.
If you really need the extension, you could rename after but in s3 it means copying the files, so it might be easier if you just write using DataFrame (.toDF().write.csv())