Hi all, I followed this guide to enable SSL for HDFS as root user on my NameNode server. Then I copied the keystore and the truststore on my DataNode servers (as suggested here at step 4) because when I tried to start HDFS service I received a FileNotFoundException on /tmp/keystore.jks. After coping files on DataNode servers I tried to start HDFS service but starting DataNode servers I receive an "Permission Denied" error on the same file: here at step 6 it suggests to change permissions on the server key location, but when I execute chgrp -R yarn:hadoop /tmp/ I receive following error chgrp: invalid group: ‘yarn:hadoop’ any suggestions for me? Thanks in advance! ... View more