Cloudera Enterprise 6.3.x | Other versions

REVOKE Statement (CDH 5.2 or higher only)

The REVOKE statement revokes roles or privileges on a specified object from groups.

Syntax:

REVOKE ROLE role_name FROM GROUP group_name

REVOKE [GRANT OPTION FOR] privilege ON object_type object_name
  FROM [ROLE] role_name

privilege ::= ALL | CREATE | INSERT | REFRESH | SELECT | SELECT(column_name)

object_type ::= SERVER | URI | DATABASE | TABLE

See GRANT Statement (CDH 5.2 or higher only) for the required privileges and the scope for SQL operations.

The ALL privilege is a distinct privilege and not a union of all other privileges. Revoking SELECT, INSERT, etc. from a role that only has the ALL privilege has no effect. To reduce the privileges of that role you must REVOKE ALL and GRANT the desired privileges.

You cannot revoke a privilege granted with the WITH GRANT OPTION. If a privilege is granted with the WITH GRANT OPTION, first revoke the grant option, and then revoke the privilege.

You cannot revoke the GRANT privilege from a role without also revoking the privilege. To revoke the GRANT privilege, revoke the privilege that it applies to and then grant that privilege again without the WITH GRANT OPTION clause.

You cannot revoke a privilege granted with the WITH GRANT OPTION. If a privilege is granted with the WITH GRANT OPTION, first revoke the grant option, and then revoke the privilege.

For example: 
GRANT ALL ON SERVER TO ROLE foo_role;
...
REVOKE GRANT OPTION FOR ALL ON SERVER FROM ROLE foo_role;
REVOKE ALL ON SERVER FROM ROLE foo_role;

Typically, the object name is an identifier. For URIs, it is a string literal.

The ability to grant or revoke SELECT privilege on specific columns is available in CDH 5.5 / Impala 2.3 and higher. See Hive SQL Syntax for Use with Sentry for details. for details.

Required privileges:

Only Sentry administrative users, users who belong to the groups defined in sentry.service.admin.group of the Sentry configuration can revoke a role from a group.

Compatibility:

  • The Impala REVOKE statement is available in CDH 5.2 / Impala 2.0 and higher.
  • In CDH 5.1 / Impala 1.4 and higher, Impala makes use of any roles and privileges specified by the GRANT and REVOKE statements in Hive, when your system is configured to use the Sentry service instead of the file-based policy mechanism.
  • The Impala REVOKE statements do not require the ROLE keyword to be repeated before each role name, unlike the equivalent Hive statements.
  • Currently, each Impala GRANT or REVOKE statement can only grant or revoke a single privilege to or from a single role.

Cancellation: Cannot be cancelled.

HDFS permissions: This statement does not touch any HDFS files or directories, therefore no HDFS permissions are required.

Kudu considerations:

Access to Kudu tables must be granted to and revoked from roles with the following considerations:
  • Only users with the ALL privilege on SERVER can create external Kudu tables.
  • The ALL privileges on SERVER is required to specify the kudu.master_addresses property in the CREATE TABLE statements for managed tables as well as external tables.
  • Access to Kudu tables is enforced at the table level and at the column level.
  • The SELECT- and INSERT-specific permissions are supported.
  • The DELETE, UPDATE, and UPSERT operations require the ALL privilege.
Because non-SQL APIs can access Kudu data without going through Sentry authorization, currently the Sentry support is considered preliminary and subject to change.

Related information:

Enabling Sentry Authorization for Impala, GRANT Statement (CDH 5.2 or higher only) CREATE ROLE Statement (CDH 5.2 or higher only), DROP ROLE Statement (CDH 5.2 or higher only), SHOW Statement

Page generated August 29, 2019.