Hello  @du_datafactory  , Thank you for reaching out to the Cloudera Community. May I ask if you're experiencing the same issue that @learndeb  reported, or are you seeing a different error? Based on the logs shared in the original post, the issue appears to be related to the communication between Impala/HiveServer2 and Ranger, rather than an issue with Impala query processing itself. The "Received NULL response" while downloading Ranger policies is typically a secondary symptom that can occur if Impala or HiveServer2 is unable to successfully authenticate (for example, due to TLS or Kerberos authentication issues) before retrieving authorization policies from Ranger Admin. If you could share the exact error you're encountering, along with any initial troubleshooting you've performed (for example, relevant Impala, HiveServer2, or Ranger logs), we'd be happy to help you investigate the issue further. ... View more

@Malrashed Has the reply helped resolve your issue? If so, please mark the appropriate reply as the solution, as it will make it easier for others to find the answer in the future. If you are still experiencing the issue, can you provide the information @jagarwal has requested? Thanks. ... View more

Your suggestion is very helpful, I'm going to check it. Thank you. ... View more

Thanks for the confirmation @syedshakir. Much appreciated.  ... View more

@Amn_468  did you resolve your issue? If so, please mark the appropriate reply as the solution, as it will make it easier for others to find the answer in the future.  ... View more

Hi @PrernaU, did @Sean464's solution help you?  If so, can you please mark the appropriate reply as the solution? It will make it easier for others to find the answer in the future.  ... View more

Great article! I faced the following error while trying adding data to ldap (Step 13.)   # ldapadd -x -W -D "cn=Manager,dc=example,dc=com" -f /root/ldap/base.ldif Enter LDAP Password: adding new entry "dc=example,dc=com" ldap_add: Invalid syntax (21) additional info: objectClass: value #1 invalid per syntax   After some research, found that we need to add the cosine and nis LDAP schemas before running the preceding command.    # ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/openldap/schema/cosine.ldif # ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/openldap/schema/nis.ldif # ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/openldap/schema/inetorgperson.ldif ... View more