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Comment: add intro and links to SQL Standard Based Auth doc

Hive Authorization

Table of Contents

Introduction

Hive provides multiple ways to authorize users:

Hive Client Authorization

This section describes Hive security using the basic authorization scheme, which regulates access to Hive metadata on the client side. Starting with Hive release 0.10, additional security measures can be enabled to regulate access on the metastore side, as described in Metastore Server Security below.

...

No Format
<property>
  <name>hive.security.metastore.authorization.manager</name>
  <value>org.apache.hadoop.hive.ql.security.authorization.DefaultHiveMetastoreAuthorizationProvider</value>
  <description>authorization manager class name to be used in the metastore for authorization.
  The user defined authorization class should implement interface
  org.apache.hadoop.hive.ql.security.authorization.HiveMetastoreAuthorizationProvider.
  </description>
 </property>

<property>
  <name>hive.security.metastore.authenticator.manager</name>
  <value>org.apache.hadoop.hive.ql.security.HadoopDefaultMetastoreAuthenticator</value>
  <description>authenticator manager class name to be used in the metastore for authentication.
  The user defined authenticator should implement interface 
  org.apache.hadoop.hive.ql.security.HiveAuthenticationProvider.
  </description>
</property>

<property>
  <name>hive.metastore.pre.event.listeners</name>
  <value> </value>
  <description>pre-event listener classes to be loaded on the metastore side to run code
  whenever databases, tables, and partitions are created, altered, or dropped.
  Set to org.apache.hadoop.hive.ql.security.authorization.AuthorizationPreEventListener
  if metastore-side authorization is desired.
  </description>
</property>

SQL Standards Based Authorization

Hive release 0.13.0 introduced authorization based on SQL standards.  See SQL Standard Based Hive Authorization for details.