docs/topics/impala_revoke.xml

<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept rev="2.0.0" id="revoke">

  <title>REVOKE Statement (<keyword keyref="impala20"/> or higher only)</title>

  <titlealts audience="PDF">

    <navtitle>REVOKE</navtitle>

  </titlealts>

  <prolog>
    <metadata>
      <data name="Category" value="Impala"/>
      <data name="Category" value="DDL"/>
      <data name="Category" value="SQL"/>
      <data name="Category" value="Security"/>
      <data name="Category" value="Sentry"/>
      <data name="Category" value="Roles"/>
      <data name="Category" value="Administrators"/>
      <data name="Category" value="Developers"/>
      <data name="Category" value="Data Analysts"/>
<!-- Consider whether to go deeper into categories like Security for the Sentry-related statements. -->
    </metadata>
  </prolog>

  <conbody>

    <p rev="2.0.0">
      The <codeph>REVOKE</codeph> statement revokes roles or privileges on a specified object
      from groups, roles, or users.
    </p>

    <p conref="../shared/impala_common.xml#common/syntax_blurb"/>

    <p>
      The following syntax is supported when Impala is using Senty to manage authorization.
    </p>

<codeblock rev="2.3.0 collevelauth">REVOKE ROLE <varname>role_name</varname> FROM GROUP <varname>group_name</varname>

REVOKE [GRANT OPTION FOR] <varname>privilege</varname> ON <varname>object_type</varname> <varname>object_name</varname>
  FROM [ROLE] <varname>role_name</varname>

<ph rev="3.0">
  <varname>privilege</varname> ::= ALL | ALTER | CREATE | DROP | INSERT | REFRESH | SELECT | SELECT(<varname>column_name</varname>)
</ph>
<ph id="priv_objs" rev="3.0"><varname>object_type</varname> ::= SERVER | URI | DATABASE | TABLE</ph></codeblock>

    <p>
      The following syntax is supported when Impala is using Ranger to manage authorization.
    </p>

<codeblock>REVOKE <varname>privilege</varname> ON <varname>object_type</varname> <varname>object_name</varname>
  FROM USER <varname>user_name</varname>

REVOKE <varname>privilege</varname> ON <varname>object_type</varname> <varname>object_name</varname>
  FROM GROUP <varname>group_name</varname>
<ph rev="3.0">

  privilege ::= ALL | ALTER | CREATE | DROP | INSERT | REFRESH | SELECT | SELECT(<varname>column_name</varname>)
</ph>
<ph rev="3.0">object_type ::= SERVER | URI | DATABASE | TABLE</ph></codeblock>

    <p>
      <b>Usage notes:</b>
    </p>

    <p>
      See <keyword keyref="grant"/> for the required privileges and the scope for SQL
      operations.
    </p>

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

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

    <p>
      For example:
<codeblock>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;</codeblock>
    </p>

    <p>
      Typically, the object name is an identifier. For URIs, it is a string literal.
    </p>

    <p rev="2.3.0 collevelauth">
      The ability to grant or revoke <codeph>SELECT</codeph> privilege on specific columns is
      available in <keyword keyref="impala23_full"/> and higher. See
      <xref keyref="sg_hive_sql"/> for details.
    </p>

    <p conref="../shared/impala_common.xml#common/privileges_blurb"/>

    <p>
      Only administrative users (those with <codeph>ALL</codeph> privileges on the server,
      defined in the Sentry policy file) can use this statement.
    </p>

    <p>
      Only Sentry administrative users can revoke the role from a group.
    </p>

    <p conref="../shared/impala_common.xml#common/compatibility_blurb"/>

    <p>
      <ul>
        <li>
          The <codeph>REVOKE</codeph> statements are available in
          <keyword
            keyref="impala20_full"/> and higher.
        </li>

        <li>
          In <keyword keyref="impala14_full"/> and higher, Impala makes use of any roles and
          privileges specified by the <codeph>GRANT</codeph> and <codeph>REVOKE</codeph>
          statements in Hive, when your system is configured to use the Sentry service instead
          of the file-based policy mechanism.
        </li>

        <li>
          The Impala <codeph>REVOKE</codeph> statements do not require the <codeph>ROLE</codeph>
          keyword to be repeated before each role name, unlike the equivalent Hive statements.
        </li>

        <li conref="../shared/impala_common.xml#common/grant_revoke_single"/>
      </ul>
    </p>

    <p conref="../shared/impala_common.xml#common/cancel_blurb_no"/>

    <p conref="../shared/impala_common.xml#common/permissions_blurb_no"/>

    <p rev="2.8.0" conref="../shared/impala_common.xml#common/kudu_blurb"/>

    <p conref="../shared/impala_common.xml#common/kudu_sentry_limitations"/>

    <p conref="../shared/impala_common.xml#common/related_info"/>

    <p>
      <xref href="impala_authorization.xml#authorization"/>,
      <xref href="impala_grant.xml#grant"/> <xref href="impala_create_role.xml#create_role"/>,
      <xref href="impala_drop_role.xml#drop_role"/>, <xref href="impala_show.xml#show"/>
    </p>

  </conbody>

</concept>