@Mazin Mohammed Great to hear that your problem has been resolved. If you find my reply useful, please accept it as answer, so that other facing similar issue can know what to look for. Thanks. ... View more

Hello @Mazin Mohammed, The "Failed to find any Kerberos credentials" error in Namenode log, could also mean wrong / bad Kerberos credential for Namenode process. It does not necessarily always mean client credential. Please check during NameNode startup that if the daemon was able to use nn.service.keytab and spnego.service.keytab both to secure a kerberos credential for itself. You also might want to enable Kerberos debug for NameNode by adding "-Dsun.security.krb5.debug=true" to Namenode command-line argument list. Let us know. Happy hunting ! ... View more