So what I am trying to do is to crawl data on S3 bucket with AWS Glue. Data stored as nested json and path looks like this:
s3://my-bucket/some_id/some_subfolder/datetime.json
When running default crawler (no custom classifiers) it does partition it based on path and deserializes json as expected, however, I would like to get a timestamp from the file name as well in a separate field. For now Crawler omits it.
For example if I run crawler on:
s3://my-bucket/10001/fromage/2017-10-10.json
I get table schema like this:
- Partition 1: 10001
- Partition 2: fromage
- Array: JSON data
I did try to add custom classifier based on Grok pattern:
%{INT:id}/%{WORD:source}/%{TIMESTAMP_ISO8601:timestamp}
However, whenever I re-run crawler it skips custom classifier and uses default JSON one. As a solution obviously I could append file name to the JSON itself before running a crawler, but was wondering if I can avoid this step?