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In my case, I had 2 connections on my glue job and I only required the JDBC connection to redshift. I had an additional network connection which wasn't required since everything was on the same network
Notice that Glue is trying to use the MySQL driver driver, which will use a different port and connectivity.
Doublecheck you are using the right connection and that is well defined (or point the target directly to Redshift without a connection/table)
Double check your Glue connection was set up for Redshift and not generic JDBC (as was pointed out, your connection thinks it is MySQL). Also as a reminder, when using Glue with Redshift we also strongly recommend using Glue 4.0 as the newest connectors are exponentially better than the old.
For running queries before or after a data load I recommend using the redshift_connector python library on pypi via --additional-python-modules.
'Communications link failure' typically indicates that the Glue job is unable to reach the source and/or destination target.
Check the vpc setup, like the subnets and the security groups, refer the below documentation for reference
[+] Redshift connections - Set up Amazon VPC - https://docs.aws.amazon.com/glue/latest/dg/aws-glue-programming-etl-connect-redshift-home.html#aws-glue-programming-etl-redshift-config-vpc
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Hey Gonzalo thanks very much for your response. Currently, I have picked the appropriate connection to my database in redshift, and also picked the schema and the table to ingest into in redshift. What do you mean by point to redshift without the connection/table? Where would the data end up going then?