https://community.cloudera.com/t5/Support-Questions/Spark-ports-to-connect-to-rdbms-source-using-jdbc/m-p/322933#M228970 <P>Hello</P><P>&nbsp;</P><P>I have a spark cluster on CHD 6.3.3<BR />1 master node and 3 worker nodes</P><P>I will read huge data from external RDBMS”mssql” using jdbc driver&nbsp;</P><P>And I need to open the port in the firewall</P><P>My external RDBMS port is 99766</P><P>But my problem is what port should I open from the spark side for each node so I can read and write data using the master and all workers in my spark application.</P><P>&nbsp;</P><P>Thank you&nbsp;</P> Sat, 21 Aug 2021 16:16:26 GMT KhASQ 2021-08-21T16:16:26Z