impala/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">
      <indexterm audience="hidden">REVOKE statement</indexterm>
<!-- Copied from Sentry docs. Turn into conref. I did some rewording for clarity. -->
      The <codeph>REVOKE</codeph> statement revokes roles or privileges on a specified object from groups. Only
      Sentry administrative users can revoke the role from a group. The revocation has a cascading effect. For
      example, revoking the <codeph>ALL</codeph> privilege on a database also revokes the same privilege for all
      the tables in that database.
    </p>

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

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

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

<ph rev="2.3.0">privilege ::= SELECT | SELECT(<varname>column_name</varname>) | INSERT | ALL</ph>
object_type ::= TABLE | DATABASE | SERVER | URI
</codeblock>

    <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 audience="integrated" href="sg_hive_sql.xml#concept_c2q_4qx_p4/col_level_auth_sentry"/><xref audience="standalone" href="https://www.cloudera.com/documentation/enterprise/latest/topics/sg_hive_sql.html" format="html" scope="external"/>
      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>

<!-- Turn compatibility info into a conref or series of conrefs. (In both GRANT and REVOKE.) -->

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

    <p>
      <ul>
        <li>
          The Impala <codeph>GRANT</codeph> and <codeph>REVOKE</codeph> statements are available in CDH 5.2 and
          higher.
        </li>

        <li>
          In <ph rev="upstream">CDH 5.1</ph> 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>GRANT</codeph> and <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 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>