https://community.cloudera.com/t5/Support-Questions/Spark-ports-to-connect-to-rdbms-source-using-jdbc/m-p/323438#M229114 <P>Hi</P><P>&nbsp;</P><P>Apache spark will initiate connection to your db on that port only via jdbc , so you can open a firewall where sources are your nodes ips and destination is your db server ip on the port you specified.</P><P>&nbsp;</P><P>Best Regards&nbsp;</P> Tue, 31 Aug 2021 20:58:30 GMT tarekabouzeid91 2021-08-31T20:58:30Z