https://community.cloudera.com/t5/Support-Questions/Failed-to-start-Hadoop/m-p/313006#M225366 <P>We are seeing port bind exception in the error stack trace which basically means the secondary NN service is unable to register itself on that port. Port 50090 is the internal port defined by this property "dfs.secondary.http.address or dfs.namenode. secondary. http-address".</P><P>&nbsp;</P><P>So please run "netstat -anp | grep 50090" and see which process is using the port in question. Stop that process and try starting Secondary NN service or else we need to change the default port in the abovementioned property to some other non-used port.</P><P>&nbsp;</P> Mon, 15 Mar 2021 04:02:01 GMT amk 2021-03-15T04:02:01Z