HBASE-12421 Clarify ACL concepts and best practices
Signed-off-by: stack <stack@apache.org>
This commit is contained in:
Misty Stanley-Jones
stack
parent
822bcce91e
commit
8e5503baa8
|
|
@ -573,199 +573,196 @@ grant 'rest_server', 'RWCA'
|
|||
</note>
|
||||
<para>HBase has a simpler security model than relational databases, especially in terms of
|
||||
client operations. No distinction is made between an insert (new record) and update (of
|
||||
existing record), for example, as both collapse down into a Put. Accordingly, the
|
||||
important operations condense to four permissions: READ, WRITE, CREATE, and ADMIN.</para>
|
||||
existing record), for example, as both collapse down into a Put.</para>
|
||||
<section>
|
||||
<title>Understanding Access Levels</title>
|
||||
<para>HBase access levels are granted independently of each other and allow for different
|
||||
types of operations at a given scope.</para>
|
||||
<itemizedlist>
|
||||
<listitem>
|
||||
<para>Read (R) - can read data at the given scope</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><command>Write (W)</command> - can write data at the given scope</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><command>Execute (X)</command> - can execute coprocessor endpoints at the given
|
||||
scope</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><command>Create (C)</command> - can create tables or drop tables (even those
|
||||
they did not create) at the given scope</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><command>Admin (A)</command> - can perform cluster operations such as balancing
|
||||
the cluster or assigning regions at the given scope</para>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
<para>The possible scopes are:</para>
|
||||
<itemizedlist>
|
||||
<listitem>
|
||||
<para><command>Superuser</command> - superusers can perform any operation available in
|
||||
HBase, to any resource. The user who runs HBase on your cluster is a superuser, as
|
||||
are any principals assigned to the configuration property
|
||||
<code>hbase.superuser</code> in <filename>hbase-site.xml</filename> on the
|
||||
HMaster.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><command>Global</command> - permissions granted at <filename>global</filename>
|
||||
scope allow the admin to operate on all tables of the cluster.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><command>Namespace</command> - permissions granted at
|
||||
<filename>namespace</filename> scope apply to all tables within a given
|
||||
namespace.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><command>Table</command> - permissions granted at <filename>table</filename>
|
||||
scope apply to data or metadata within a given table.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><command>ColumnFamily</command> - permissions granted at
|
||||
<filename>ColumnFamily</filename> scope apply to cells within that
|
||||
ColumnFamily.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><command>Cell</command> - permissions granted at <filename>cell</filename> scope
|
||||
apply to that exact cell coordinate (key, value, timestamp). This allows for policy
|
||||
evolution along with data.</para>
|
||||
<para>To change an ACL on a specific cell, write an updated cell with new ACL to the
|
||||
precise coordinates of the original.</para>
|
||||
<para>If you have a multi-versioned schema and want to update ACLs on all visible
|
||||
versions, you need to write new cells for all visible versions. The application
|
||||
has complete control over policy evolution.</para>
|
||||
<para>The exception to the above rule is <code>append</code> and
|
||||
<code>increment</code> processing. Appends and increments can carry an ACL in the
|
||||
operation. If one is included in the operation, then it will be applied to the
|
||||
result of the <code>append</code> or <code>increment</code>. Otherwise, the ACL of
|
||||
the existing cell you are appending to or incrementing is preserved.</para>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
<para>The combination of access levels and scopes creates a matrix of possible access
|
||||
levels that can be granted to a user. In a production environment, it is useful to think
|
||||
of access levels in terms of what is needed to do a specific job. The following list
|
||||
describes appropriate access levels for some common types of HBase users. It is
|
||||
important not to grant more access than is required for a given user to perform their
|
||||
required tasks.</para>
|
||||
<itemizedlist>
|
||||
<listitem>
|
||||
<para>Superusers - In a production system, only the HBase user should have superuser
|
||||
access. In a development environment, an administrator may need superuser access in
|
||||
order to quickly control and manage the cluster. However, this type of administrator
|
||||
should usually be a Global Admin rather than a superuser.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Global Admins - A global admin can perform tasks and access every table in
|
||||
HBase. In a typical production environment, an admin should not have Read or Write
|
||||
permissions to data within tables.</para>
|
||||
<itemizedlist>
|
||||
<listitem>
|
||||
<para>A global admin with Admin permissions can perform cluster-wide operations on
|
||||
the cluster, such as balancing, assigning or unassigning regions, or calling an
|
||||
explicit major compaction. This is an operations role.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>A global admin with Create permissions can create or drop any table within
|
||||
HBase. This is more of a DBA-type role.</para>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
<para>In a production environment, it is likely that different users will have only
|
||||
one of Admin and Create permissions.</para>
|
||||
<warning>
|
||||
<para>In the current implementation, a Global Admin with <code>Admin</code>
|
||||
permission can grant himself <code>Read</code> and <code>Write</code> permissions
|
||||
on a table and gain access to that table's data. For this reason, only grant
|
||||
<code>Global Admin</code> permissions to trusted user who actually need
|
||||
them.</para>
|
||||
<para>Also be aware that a <code>Global Admin</code> with <code>Create</code>
|
||||
permission can perform a <code>Put</code> operation on the ACL table, simulating a
|
||||
<code>grant</code> or <code>revoke</code> and circumventing the authorization
|
||||
check for <code>Global Admin</code> permissions.</para>
|
||||
<para>Due to these issues, be cautious with granting <code>Global Admin</code>
|
||||
privileges.</para>
|
||||
</warning>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><command>Namespace Admins</command> - a namespace admin with <code>Create</code>
|
||||
permissions can create or drop tables within that namespace, and take and restore
|
||||
snapshots. A namespace admin with <code>Admin</code> permissions can perform
|
||||
operations such as splits or major compactions on tables within that
|
||||
namespace.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><command>Table Admins</command> - A table admin can perform administrative
|
||||
operations only on that table. A table admin with <code>Create</code> permissions
|
||||
can create snapshots from that table or restore that table from a snapshot. A table
|
||||
admin with <code>Admin</code> permissions can perform operations such as splits or
|
||||
major compactions on that table.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><command>Users</command> - Users can read or write data, or both. Users can also
|
||||
execute coprocessor endpoints, if given <code>Executable</code> permissions.</para>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
<table>
|
||||
<title>Operation To Permission Mapping</title>
|
||||
<tgroup cols="2" align="left" colsep="1" rowsep="1">
|
||||
<colspec colname="c1" align="center"/>
|
||||
<colspec colname="c2" align="left"/>
|
||||
<title>Real-World Example of Access Levels</title>
|
||||
<tgroup cols="4">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Permission</entry>
|
||||
<entry>Operation</entry>
|
||||
<entry>Job Title</entry>
|
||||
<entry>Scope</entry>
|
||||
<entry>Permissions</entry>
|
||||
<entry>Description</entry>
|
||||
</row>
|
||||
</thead>
|
||||
<tbody>
|
||||
<!-- READ -->
|
||||
<row>
|
||||
<entry>Read</entry>
|
||||
<entry>Get</entry>
|
||||
<entry><para>Senior Administrator</para></entry>
|
||||
<entry><para>Global</para></entry>
|
||||
<entry><para>Access, Create</para></entry>
|
||||
<entry><para>Manages the cluster and gives access to Junior
|
||||
Administrators.</para></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Exists</entry>
|
||||
<entry><para>Junior Administrator</para></entry>
|
||||
<entry><para>Global</para></entry>
|
||||
<entry><para>Create</para></entry>
|
||||
<entry><para>Creates tables and gives access to Table
|
||||
Administrators.</para></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Scan</entry>
|
||||
</row>
|
||||
<!-- WRITE -->
|
||||
<row>
|
||||
<entry>Write</entry>
|
||||
<entry>Put</entry>
|
||||
<entry><para>Table Administrator</para></entry>
|
||||
<entry><para>Table</para></entry>
|
||||
<entry><para>Access</para></entry>
|
||||
<entry><para>Maintains a table from an operations point of view.</para></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Delete</entry>
|
||||
<entry><para>Data Analyst</para></entry>
|
||||
<entry><para>Table</para></entry>
|
||||
<entry><para>Read</para></entry>
|
||||
<entry><para>Creates reports from HBase data.</para></entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>IncrementColumnValue</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>CheckAndDelete/Put</entry>
|
||||
</row>
|
||||
<!-- CREATE -->
|
||||
<row>
|
||||
<entry>Create</entry>
|
||||
<entry>Create</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Alter</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Drop</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Bulk Load</entry>
|
||||
</row>
|
||||
<!-- ADMIN -->
|
||||
<row>
|
||||
<entry>Admin</entry>
|
||||
<entry>Enable/Disable</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Snapshot/Restore/Clone</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Split</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Flush</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Compact</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Major Compact</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry />
|
||||
<entry>Roll HLog</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Grant</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Revoke</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry/>
|
||||
<entry>Shutdown</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>Execute</entry>
|
||||
<entry>Execute coprocessor endpoints</entry>
|
||||
<entry><para>Web Application</para></entry>
|
||||
<entry><para>Table</para></entry>
|
||||
<entry><para>Read, Write</para></entry>
|
||||
<entry><para>Puts data into HBase and uses HBase data to perform
|
||||
operations.</para></entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
<caption><para>This table shows how real-world titles might map to HBase permissions in
|
||||
a hypothetical company.</para></caption>
|
||||
|
||||
</table>
|
||||
<para> Permissions can be granted in any of the following scopes, though CREATE and ADMIN
|
||||
permissions are effective only at table, namespace, and global scopes. </para>
|
||||
<variablelist>
|
||||
<varlistentry>
|
||||
<term>Namespace</term>
|
||||
<listitem>
|
||||
<itemizedlist>
|
||||
<listitem>
|
||||
<para>Read: User can read any table in the namespace.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Write: User can write to any table in the namespace.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Create: User can create tables in the namespace.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Admin: User can alter table attributes; add, alter, or drop column families;
|
||||
and enable, disable, or drop the table. User can also trigger region
|
||||
(re)assignments or relocation.</para>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
<varlistentry>
|
||||
<term>Table</term>
|
||||
<listitem>
|
||||
<itemizedlist>
|
||||
<listitem>
|
||||
<para>Read: User can read from any column family in table</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Write: User can write to any column family in table</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Create: User can alter table attributes; add, alter, or drop column
|
||||
families; and drop the table.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Admin: User can alter table attributes; add, alter, or drop column families;
|
||||
and enable, disable, or drop the table. User can also trigger region
|
||||
(re)assignments or relocation.</para>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
<varlistentry>
|
||||
<term>Column Family / Column Qualifier / Cell</term>
|
||||
<listitem>
|
||||
<itemizedlist>
|
||||
<listitem>
|
||||
<para>Read: User can read at the specified scope.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>Write: User can write at the specified scope.</para>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
<varlistentry>
|
||||
<term>Coprocessor Endpoint</term>
|
||||
<listitem>
|
||||
<para>Execute: the user can execute the coprocessor endpoint.</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
<varlistentry>
|
||||
<term>Global</term>
|
||||
<listitem>
|
||||
<para>Superusers are specified as a comma-separated list of users and groups, in the
|
||||
<option>hbase.superuser</option> option in <filename>hbase-site.xml</filename>.
|
||||
The superuser is equivalent to the <literal>root</literal> user in a UNIX
|
||||
environment. As a minimum, the superuser should include the principal used to run
|
||||
the HMaster process. Global admin privileges, which are implicitly granted to the
|
||||
superuser, are required to create namespaces, switch the balancer on and off, or
|
||||
take other actions with global consequences. The superuser can also grant all
|
||||
permissions to all resources.</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
</variablelist>
|
||||
<formalpara>
|
||||
<title>ACL Matrix</title>
|
||||
<para>For more details on how ACLs map to specific HBase operations and tasks, see <xref
|
||||
linkend="appendix_acl_matrix"/>.</para>
|
||||
</formalpara>
|
||||
</section>
|
||||
<section>
|
||||
<title>Implementation Details</title>
|
||||
<para>Cell-level ACLs are implemented using tags (see <xref linkend="hbase.tags"/>). In
|
||||
order to use cell-level ACLs, you must be using HFile v3 and HBase 0.98 or newer.</para>
|
||||
<orderedlist>
|
||||
|
|
@ -788,7 +785,8 @@ grant 'rest_server', 'RWCA'
|
|||
<procedure>
|
||||
<step>
|
||||
<para>As a prerequisite, perform the steps in <xref
|
||||
linkend="security.data.basic.server.side"/>.</para></step>
|
||||
linkend="security.data.basic.server.side"/>.</para>
|
||||
</step>
|
||||
<step>
|
||||
<para>Install and configure the AccessController coprocessor, by setting the following
|
||||
properties in <filename>hbase-site.xml</filename>. These properties take a list of
|
||||
|
|
@ -798,7 +796,8 @@ grant 'rest_server', 'RWCA'
|
|||
AccessController must come first in the list, because with both components active,
|
||||
the VisibilityController will delegate access control on its system tables to the
|
||||
AccessController. For an example of using both together, see <xref
|
||||
linkend="security.example.config"/>.</para></note>
|
||||
linkend="security.example.config"/>.</para>
|
||||
</note>
|
||||
<programlisting language="xml"><![CDATA[
|
||||
<property>
|
||||
<name>hbase.coprocessor.region.classes</name>
|
||||
|
|
@ -818,8 +817,8 @@ grant 'rest_server', 'RWCA'
|
|||
</property>
|
||||
]]></programlisting>
|
||||
<para>Optionally, you can enable transport security, by setting
|
||||
<option>hbase.rpc.protection</option> to <literal>auth-conf</literal>. This requires
|
||||
HBase 0.98.4 or newer.</para>
|
||||
<option>hbase.rpc.protection</option> to <literal>auth-conf</literal>. This
|
||||
requires HBase 0.98.4 or newer.</para>
|
||||
</step>
|
||||
<step>
|
||||
<para>Set up the Hadoop group mapper in the Hadoop namenode's
|
||||
|
|
@ -873,13 +872,13 @@ grant 'rest_server', 'RWCA'
|
|||
</programlisting>
|
||||
</step>
|
||||
<step>
|
||||
<para>Optionally, enable the early-out evaluation strategy. Prior to HBase 0.98.0, if a
|
||||
user was not granted access to a column family, or at least a column qualifier, an
|
||||
AccessDeniedException would be thrown. HBase 0.98.0 removed this exception in order to
|
||||
allow cell-level exceptional grants. To restore the old behavior in HBase
|
||||
<para>Optionally, enable the early-out evaluation strategy. Prior to HBase 0.98.0, if
|
||||
a user was not granted access to a column family, or at least a column qualifier, an
|
||||
AccessDeniedException would be thrown. HBase 0.98.0 removed this exception in order
|
||||
to allow cell-level exceptional grants. To restore the old behavior in HBase
|
||||
0.98.0-0.98.6, set <option>hbase.security.access.early_out</option> to
|
||||
<literal>true</literal> in <filename>hbase-site.xml</filename>. In HBase 0.98.6, the
|
||||
default has been returned to <literal>true</literal>.</para>
|
||||
<literal>true</literal> in <filename>hbase-site.xml</filename>. In HBase 0.98.6,
|
||||
the default has been returned to <literal>true</literal>.</para>
|
||||
</step>
|
||||
<step>
|
||||
<para>Distribute your configuration and restart your cluster for changes to take
|
||||
|
|
@ -887,8 +886,8 @@ grant 'rest_server', 'RWCA'
|
|||
</step>
|
||||
<step>
|
||||
<para>To test your configuration, log into HBase Shell as a given user and use the
|
||||
<command>whoami</command> command to report the groups your user is part of. In this
|
||||
example, the user is reported as being a member of the <code>services</code>
|
||||
<command>whoami</command> command to report the groups your user is part of. In
|
||||
this example, the user is reported as being a member of the <code>services</code>
|
||||
group.</para>
|
||||
<screen>
|
||||
hbase> <userinput>whoami</userinput>
|
||||
|
|
@ -908,8 +907,8 @@ hbase> <userinput>whoami</userinput>
|
|||
and
|
||||
<filename>hbase-server/src/test/java/org/apache/hadoop/hbase/security/access/SecureTestUtil.java</filename>.</para>
|
||||
<para>Neither the examples, nor the source files they are taken from, are part of the
|
||||
public HBase API, and are provided for illustration only. Refer to the
|
||||
official API for usage instructions.</para>
|
||||
public HBase API, and are provided for illustration only. Refer to the official API
|
||||
for usage instructions.</para>
|
||||
</caution>
|
||||
<procedure>
|
||||
<step>
|
||||
|
|
@ -919,21 +918,22 @@ hbase> <userinput>whoami</userinput>
|
|||
<step>
|
||||
<title>Granting Access To A Namespace, Table, Column Family, or Cell</title>
|
||||
<para>There are a few different types of syntax for grant statements. The first, and
|
||||
most familiar, is as follows, with the table and column family being optional:</para>
|
||||
most familiar, is as follows, with the table and column family being
|
||||
optional:</para>
|
||||
<screen>grant 'user', 'RWXCA', 'TABLE', 'CF', 'CQ'</screen>
|
||||
<para>Groups and users are granted access in the same way, but groups are prefixed with
|
||||
an <literal>@</literal> symbol. In the same way, tables and namespaces are specified
|
||||
in the same way, but namespaces are prefixed with an <literal>@</literal>
|
||||
<para>Groups and users are granted access in the same way, but groups are prefixed
|
||||
with an <literal>@</literal> symbol. In the same way, tables and namespaces are
|
||||
specified in the same way, but namespaces are prefixed with an <literal>@</literal>
|
||||
symbol.</para>
|
||||
<para>It is also possible to grant multiple permissions against the same resource in a
|
||||
single statement, as in this example. The first sub-clause maps users to
|
||||
ACLs and the second sub-clause specifies the resource.</para>
|
||||
single statement, as in this example. The first sub-clause maps users to ACLs and
|
||||
the second sub-clause specifies the resource.</para>
|
||||
<note>
|
||||
<para>HBase Shell support for granting and revoking access at the cell level is for
|
||||
testing and verification support, and should not be employed for production use
|
||||
because it won't apply the permissions to cells that don't exist yet. The correct
|
||||
way to apply cell level permissions is to do so in the application code when storing
|
||||
the values.</para>
|
||||
way to apply cell level permissions is to do so in the application code when
|
||||
storing the values.</para>
|
||||
</note>
|
||||
<formalpara>
|
||||
<title>ACL Granularity and Evaluation Order</title>
|
||||
|
|
@ -982,15 +982,15 @@ hbase> <userinput>whoami</userinput>
|
|||
scope.</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para><replaceable><scanner-specification></replaceable> is the scanner
|
||||
specification syntax and conventions used by the 'scan' shell command. For
|
||||
some examples of scanner specifications, issue the following HBase Shell
|
||||
command.</para>
|
||||
<para><replaceable><scanner-specification></replaceable> is the
|
||||
scanner specification syntax and conventions used by the 'scan' shell
|
||||
command. For some examples of scanner specifications, issue the following
|
||||
HBase Shell command.</para>
|
||||
<screen>hbase> help "scan"</screen>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
<para>This example grants read access to the 'testuser' user and read/write access
|
||||
to the 'developers' group, on cells in the 'pii' column which match the
|
||||
<para>This example grants read access to the 'testuser' user and read/write
|
||||
access to the 'developers' group, on cells in the 'pii' column which match the
|
||||
filter.</para>
|
||||
<screen>hbase> grant 'user', \
|
||||
{ '@developers' => 'RW', 'testuser' => 'R' }, \
|
||||
|
|
@ -1002,8 +1002,7 @@ hbase> <userinput>whoami</userinput>
|
|||
</example>
|
||||
<example>
|
||||
<title>API</title>
|
||||
<para>The following example shows how to grant access at the
|
||||
table level.</para>
|
||||
<para>The following example shows how to grant access at the table level.</para>
|
||||
<programlisting language="java"><![CDATA[
|
||||
public static void grantOnTable(final HBaseTestingUtility util, final String user,
|
||||
final TableName table, final byte[] family, final byte[] qualifier,
|
||||
|
|
@ -1043,15 +1042,16 @@ put.setACL(“user1”, new Permission(Permission.Action.READ))
|
|||
<step>
|
||||
<title>Revoking Access Control From a Namespace, Table, Column Family, or Cell</title>
|
||||
<para>The <command>revoke</command> command and API are twins of the grant command and
|
||||
API, and the syntax is exactly the same. The only exception is that you cannot revoke
|
||||
permissions at the cell level. You can only revoke access that has previously been
|
||||
granted, and a <command>revoke</command> statement is not the same thing as explicit
|
||||
denial to a resource.</para>
|
||||
API, and the syntax is exactly the same. The only exception is that you cannot
|
||||
revoke permissions at the cell level. You can only revoke access that has previously
|
||||
been granted, and a <command>revoke</command> statement is not the same thing as
|
||||
explicit denial to a resource.</para>
|
||||
<note>
|
||||
<para>HBase Shell support for granting and revoking access is for testing and verification
|
||||
support, and should not be employed for production use because it won't apply the
|
||||
permissions to cells that don't exist yet. The correct way to apply cell-level
|
||||
permissions is to do so in the application code when storing the values.</para>
|
||||
<para>HBase Shell support for granting and revoking access is for testing and
|
||||
verification support, and should not be employed for production use because it
|
||||
won't apply the permissions to cells that don't exist yet. The correct way to
|
||||
apply cell-level permissions is to do so in the application code when storing the
|
||||
values.</para>
|
||||
</note>
|
||||
<example>
|
||||
<title>Revoking Access To a Table</title>
|
||||
|
|
@ -1109,6 +1109,7 @@ public static void verifyAllowed(User user, AccessTestAction action, int count)
|
|||
</procedure>
|
||||
</section>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
<section>
|
||||
<title>Visibility Labels</title>
|
||||
|
|
|
|||
Loading…
Reference in New Issue