Author: pzampino
Date: Sat Jun 30 16:31:19 2018
New Revision: 1834750
URL: http://svn.apache.org/viewvc?rev=1834750&view=rev
Log:
Added docs for namenode federation support as it relates to proxying WEBHDFS
Modified:
knox/site/books/knox-0-10-0/deployment-overview.png
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knox/site/books/knox-0-11-0/deployment-provider.png
knox/site/books/knox-0-11-0/deployment-service.png
knox/site/books/knox-0-11-0/general_saml_flow.png
knox/site/books/knox-0-11-0/runtime-overview.png
knox/site/books/knox-0-11-0/runtime-request-processing.png
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knox/site/books/knox-0-12-0/deployment-provider.png
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knox/site/books/knox-0-8-0/runtime-overview.png
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knox/site/books/knox-0-9-0/deployment-provider.png
knox/site/books/knox-0-9-0/deployment-service.png
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knox/site/project-info.html
knox/site/team-list.html
knox/trunk/books/1.1.0/service_webhdfs.md
Modified: knox/site/books/knox-0-10-0/deployment-overview.png
URL:
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URL:
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Modified: knox/site/books/knox-0-9-0/deployment-provider.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-0-9-0/deployment-provider.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-0-9-0/deployment-service.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-0-9-0/deployment-service.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-0-9-0/general_saml_flow.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-0-9-0/general_saml_flow.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-0-9-0/runtime-overview.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-0-9-0/runtime-overview.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-0-9-0/runtime-request-processing.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-0-9-0/runtime-request-processing.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-0-9-1/deployment-overview.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-0-9-1/deployment-overview.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-0-9-1/deployment-provider.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-0-9-1/deployment-provider.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-0-9-1/deployment-service.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-0-9-1/deployment-service.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-0-9-1/general_saml_flow.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-0-9-1/general_saml_flow.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-0-9-1/runtime-overview.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-0-9-1/runtime-overview.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-0-9-1/runtime-request-processing.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-0-9-1/runtime-request-processing.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-1-0-0/deployment-overview.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-1-0-0/deployment-overview.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-1-0-0/deployment-provider.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-1-0-0/deployment-provider.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-1-0-0/deployment-service.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-1-0-0/deployment-service.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-1-0-0/general_saml_flow.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-1-0-0/general_saml_flow.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-1-0-0/runtime-overview.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-1-0-0/runtime-overview.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-1-0-0/runtime-request-processing.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-1-0-0/runtime-request-processing.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-1-1-0/deployment-overview.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-1-1-0/deployment-overview.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-1-1-0/deployment-provider.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-1-1-0/deployment-provider.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-1-1-0/deployment-service.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-1-1-0/deployment-service.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-1-1-0/general_saml_flow.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-1-1-0/general_saml_flow.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-1-1-0/runtime-overview.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-1-1-0/runtime-overview.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-1-1-0/runtime-request-processing.png
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-1-1-0/runtime-request-processing.png?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
Binary files - no diff available.
Modified: knox/site/books/knox-1-1-0/user-guide.html
URL:
http://svn.apache.org/viewvc/knox/site/books/knox-1-1-0/user-guide.html?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
--- knox/site/books/knox-1-1-0/user-guide.html (original)
+++ knox/site/books/knox-1-1-0/user-guide.html Sat Jun 30 16:31:19 2018
@@ -4762,7 +4762,97 @@ dep/commons-codec-1.7.jar
<role>WEBHDFS</role>
<url>http://localhost:50070/webhdfs</url>
</service>
-</code></pre><p>The URL provided for the role NAMENODE does not result in an
endpoint being exposed by the gateway. This information is only required so
that other URLs can be rewritten that reference the Name Node’s RPC
address. This prevents clients from needing to be aware of the internal cluster
details.</p><p>By default the gateway is configured to use the HTTP endpoint
for WebHDFS in the Sandbox. This could alternatively be configured to use the
HTTPS endpoint by providing the correct address.</p><h4><a
id="WebHDFS+URL+Mapping">WebHDFS URL Mapping</a> <a
href="#WebHDFS+URL+Mapping"><img
src="markbook-section-link.png"/></a></h4><p>For Name Node URLs, the mapping of
Knox Gateway accessible WebHDFS URLs to direct WebHDFS URLs is simple.</p>
+</code></pre><p>The URL provided for the role NAMENODE does not result in an
endpoint being exposed by the gateway. This information is only required so
that other URLs can be rewritten that reference the Name Node’s RPC
address. This prevents clients from needing to be aware of the internal cluster
details.</p><p>By default the gateway is configured to use the HTTP endpoint
for WebHDFS in the Sandbox. This could alternatively be configured to use the
HTTPS endpoint by providing the correct address.</p><h5><a
id="HDFS+NameNode+Federation">HDFS NameNode Federation</a> <a
href="#HDFS+NameNode+Federation"><img
src="markbook-section-link.png"/></a></h5><p>NameNode federation introduces
some additional complexity when determining to which URL(s) Knox should proxy
HDFS-related requests.</p><p>The HDFS core-site.xml configuration includes
additional properties, which represent options in terms of the NameNode
endpoints.</p>
+<table>
+ <tbody>
+ <tr>
+ <td>Property Name </td>
+ <td>Description </td>
+ <td>Example Value </td>
+ </tr>
+ <tr>
+ <td>dfs.internal.nameservices </td>
+ <td>The list of defined namespaces </td>
+ <td>ns1,ns2 </td>
+ </tr>
+ </tbody>
+</table><p>For each value enumerated by <em>dfs.internal.nameservices</em>,
there is another property defined, for specifying the associated NameNode
names.</p>
+<table>
+ <tbody>
+ <tr>
+ <td>Property Name </td>
+ <td>Description </td>
+ <td>Example Value </td>
+ </tr>
+ <tr>
+ <td>dfs.ha.namenodes.ns1 </td>
+ <td>The NameNode identifiers associated with the ns1 namespace </td>
+ <td>nn1,nn2 </td>
+ </tr>
+ <tr>
+ <td>dfs.ha.namenodes.ns2 </td>
+ <td>The NameNode identifiers associated with the ns2 namespace </td>
+ <td>nn3,nn4 </td>
+ </tr>
+ </tbody>
+</table><p>For each namenode name enumerated by each of these properties,
there are other properties defined, for specifying the associated host
addresses.</p>
+<table>
+ <tbody>
+ <tr>
+ <td>Property Name </td>
+ <td>Description </td>
+ <td>Example Value </td>
+ </tr>
+ <tr>
+ <td>dfs.namenode.http-address.ns1.nn1 </td>
+ <td>The HTTP host address of nn1 NameNode in the ns1 namespace </td>
+ <td>host1:50070 </td>
+ </tr>
+ <tr>
+ <td>dfs.namenode.https-address.ns1.nn1 </td>
+ <td>The HTTPS host address of nn1 NameNode in the ns1 namespace </td>
+ <td>host1:50470 </td>
+ </tr>
+ <tr>
+ <td>dfs.namenode.http-address.ns1.nn2 </td>
+ <td>The HTTP host address of nn2 NameNode in the ns1 namespace </td>
+ <td>host2:50070 </td>
+ </tr>
+ <tr>
+ <td>dfs.namenode.https-address.ns1.nn2 </td>
+ <td>The HTTPS host address of nn2 NameNode in the ns1 namespace </td>
+ <td>host2:50470 </td>
+ </tr>
+ <tr>
+ <td>dfs.namenode.http-address.ns2.nn3 </td>
+ <td>The HTTP host address of nn3 NameNode in the ns2 namespace </td>
+ <td>host3:50070 </td>
+ </tr>
+ <tr>
+ <td>dfs.namenode.https-address.ns2.nn3 </td>
+ <td>The HTTPS host address of nn3 NameNode in the ns2 namespace </td>
+ <td>host3:50470 </td>
+ </tr>
+ <tr>
+ <td>dfs.namenode.http-address.ns2.nn4 </td>
+ <td>The HTTP host address of nn4 NameNode in the ns2 namespace </td>
+ <td>host4:50070 </td>
+ </tr>
+ <tr>
+ <td>dfs.namenode.https-address.ns2.nn4 </td>
+ <td>The HTTPS host address of nn4 NameNode in the ns2 namespace </td>
+ <td>host4:50470 </td>
+ </tr>
+ </tbody>
+</table><p>So, if Knox should proxy the NameNodes associated with
<em>ns1</em>, and the configuration does not dictate HTTPS, then the WEBHDFS
service must contain URLs based on the values of
<em>dfs.namenode.http-address.ns1.nn1</em> and
<em>dfs.namenode.http-address.ns1.nn2</em>. Likewise, if Knox should proxy the
NameNodes associated with <em>ns2</em>, the WEBHDFS service must contain URLs
based on the values of <em>dfs.namenode.http-address.ns2.nn3</em> and
<em>dfs.namenode.http-address.ns2.nn3</em>.</p><p>Fortunately, for
Ambari-managed clusters, <a href="#Simplified+Descriptor+Files">descriptors</a>
and service discovery can handle this complexity for administrators. In the
descriptor, the service can be declared without any endpoints, and the desired
namespace can be specified to disambiguate which endpoint(s) should be proxied
by way of a parameter named <em>discovery-namespace</em>.</p>
+<pre><code>"services": [
+ {
+ "name": "WEBHDFS",
+ "params": {
+ "discovery-nameservice": "ns2"
+ }
+ },
+</code></pre><p>If no namespace is specified, then the default namespace will
be applied. This default namespace is derived from the value of the property
named <em>fs.defaultFS</em> defined in the HDFS <em>core-site.xml</em>
configuration.</p><p><br></p><h4><a id="WebHDFS+URL+Mapping">WebHDFS URL
Mapping</a> <a href="#WebHDFS+URL+Mapping"><img
src="markbook-section-link.png"/></a></h4><p>For Name Node URLs, the mapping of
Knox Gateway accessible WebHDFS URLs to direct WebHDFS URLs is simple.</p>
<table>
<tbody>
<tr>
Modified: knox/site/index.html
URL:
http://svn.apache.org/viewvc/knox/site/index.html?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
--- knox/site/index.html (original)
+++ knox/site/index.html Sat Jun 30 16:31:19 2018
@@ -1,13 +1,13 @@
<!DOCTYPE html>
<!--
- | Generated by Apache Maven Doxia at 2018-06-29
+ | Generated by Apache Maven Doxia at 2018-06-30
| Rendered using Apache Maven Fluido Skin 1.3.0
-->
<html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
- <meta name="Date-Revision-yyyymmdd" content="20180629" />
+ <meta name="Date-Revision-yyyymmdd" content="20180630" />
<meta http-equiv="Content-Language" content="en" />
<title>Knox Gateway – Announcing Apache Knox 1.0.0!</title>
<link rel="stylesheet" href="./css/apache-maven-fluido-1.3.0.min.css" />
@@ -58,7 +58,7 @@
- <li id="publishDate" class="pull-right">Last Published:
2018-06-29</li>
+ <li id="publishDate" class="pull-right">Last Published:
2018-06-30</li>
</ul>
</div>
Modified: knox/site/issue-tracking.html
URL:
http://svn.apache.org/viewvc/knox/site/issue-tracking.html?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
--- knox/site/issue-tracking.html (original)
+++ knox/site/issue-tracking.html Sat Jun 30 16:31:19 2018
@@ -1,13 +1,13 @@
<!DOCTYPE html>
<!--
- | Generated by Apache Maven Doxia at 2018-06-29
+ | Generated by Apache Maven Doxia at 2018-06-30
| Rendered using Apache Maven Fluido Skin 1.3.0
-->
<html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
- <meta name="Date-Revision-yyyymmdd" content="20180629" />
+ <meta name="Date-Revision-yyyymmdd" content="20180630" />
<meta http-equiv="Content-Language" content="en" />
<title>Knox Gateway – Issue Tracking</title>
<link rel="stylesheet" href="./css/apache-maven-fluido-1.3.0.min.css" />
@@ -58,7 +58,7 @@
- <li id="publishDate" class="pull-right">Last Published:
2018-06-29</li>
+ <li id="publishDate" class="pull-right">Last Published:
2018-06-30</li>
</ul>
</div>
Modified: knox/site/license.html
URL:
http://svn.apache.org/viewvc/knox/site/license.html?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
--- knox/site/license.html (original)
+++ knox/site/license.html Sat Jun 30 16:31:19 2018
@@ -1,13 +1,13 @@
<!DOCTYPE html>
<!--
- | Generated by Apache Maven Doxia at 2018-06-29
+ | Generated by Apache Maven Doxia at 2018-06-30
| Rendered using Apache Maven Fluido Skin 1.3.0
-->
<html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
- <meta name="Date-Revision-yyyymmdd" content="20180629" />
+ <meta name="Date-Revision-yyyymmdd" content="20180630" />
<meta http-equiv="Content-Language" content="en" />
<title>Knox Gateway – Project License</title>
<link rel="stylesheet" href="./css/apache-maven-fluido-1.3.0.min.css" />
@@ -58,7 +58,7 @@
- <li id="publishDate" class="pull-right">Last Published:
2018-06-29</li>
+ <li id="publishDate" class="pull-right">Last Published:
2018-06-30</li>
</ul>
</div>
Modified: knox/site/mail-lists.html
URL:
http://svn.apache.org/viewvc/knox/site/mail-lists.html?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
--- knox/site/mail-lists.html (original)
+++ knox/site/mail-lists.html Sat Jun 30 16:31:19 2018
@@ -1,13 +1,13 @@
<!DOCTYPE html>
<!--
- | Generated by Apache Maven Doxia at 2018-06-29
+ | Generated by Apache Maven Doxia at 2018-06-30
| Rendered using Apache Maven Fluido Skin 1.3.0
-->
<html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
- <meta name="Date-Revision-yyyymmdd" content="20180629" />
+ <meta name="Date-Revision-yyyymmdd" content="20180630" />
<meta http-equiv="Content-Language" content="en" />
<title>Knox Gateway – Project Mailing Lists</title>
<link rel="stylesheet" href="./css/apache-maven-fluido-1.3.0.min.css" />
@@ -58,7 +58,7 @@
- <li id="publishDate" class="pull-right">Last Published:
2018-06-29</li>
+ <li id="publishDate" class="pull-right">Last Published:
2018-06-30</li>
</ul>
</div>
Modified: knox/site/project-info.html
URL:
http://svn.apache.org/viewvc/knox/site/project-info.html?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
--- knox/site/project-info.html (original)
+++ knox/site/project-info.html Sat Jun 30 16:31:19 2018
@@ -1,13 +1,13 @@
<!DOCTYPE html>
<!--
- | Generated by Apache Maven Doxia at 2018-06-29
+ | Generated by Apache Maven Doxia at 2018-06-30
| Rendered using Apache Maven Fluido Skin 1.3.0
-->
<html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
- <meta name="Date-Revision-yyyymmdd" content="20180629" />
+ <meta name="Date-Revision-yyyymmdd" content="20180630" />
<meta http-equiv="Content-Language" content="en" />
<title>Knox Gateway – Project Information</title>
<link rel="stylesheet" href="./css/apache-maven-fluido-1.3.0.min.css" />
@@ -58,7 +58,7 @@
- <li id="publishDate" class="pull-right">Last Published:
2018-06-29</li>
+ <li id="publishDate" class="pull-right">Last Published:
2018-06-30</li>
</ul>
</div>
Modified: knox/site/team-list.html
URL:
http://svn.apache.org/viewvc/knox/site/team-list.html?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
--- knox/site/team-list.html (original)
+++ knox/site/team-list.html Sat Jun 30 16:31:19 2018
@@ -1,13 +1,13 @@
<!DOCTYPE html>
<!--
- | Generated by Apache Maven Doxia at 2018-06-29
+ | Generated by Apache Maven Doxia at 2018-06-30
| Rendered using Apache Maven Fluido Skin 1.3.0
-->
<html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
- <meta name="Date-Revision-yyyymmdd" content="20180629" />
+ <meta name="Date-Revision-yyyymmdd" content="20180630" />
<meta http-equiv="Content-Language" content="en" />
<title>Knox Gateway – Team list</title>
<link rel="stylesheet" href="./css/apache-maven-fluido-1.3.0.min.css" />
@@ -58,7 +58,7 @@
- <li id="publishDate" class="pull-right">Last Published:
2018-06-29</li>
+ <li id="publishDate" class="pull-right">Last Published:
2018-06-30</li>
</ul>
</div>
Modified: knox/trunk/books/1.1.0/service_webhdfs.md
URL:
http://svn.apache.org/viewvc/knox/trunk/books/1.1.0/service_webhdfs.md?rev=1834750&r1=1834749&r2=1834750&view=diff
==============================================================================
--- knox/trunk/books/1.1.0/service_webhdfs.md (original)
+++ knox/trunk/books/1.1.0/service_webhdfs.md Sat Jun 30 16:31:19 2018
@@ -61,6 +61,58 @@ This prevents clients from needing to be
By default the gateway is configured to use the HTTP endpoint for WebHDFS in
the Sandbox.
This could alternatively be configured to use the HTTPS endpoint by providing
the correct address.
+##### HDFS NameNode Federation
+
+NameNode federation introduces some additional complexity when determining to
which URL(s) Knox should proxy HDFS-related requests.
+
+The HDFS core-site.xml configuration includes additional properties, which
represent options in terms of the NameNode endpoints.
+
+| ------- | ---------------------------------------------------- |
---------------------- |
+| Property Name | Description | Example
Value |
+| dfs.internal.nameservices | The list of defined namespaces | ns1,ns2
|
+
+For each value enumerated by *dfs.internal.nameservices*, there is another
property defined, for specifying the associated NameNode names.
+
+| ------- | ------------------------------------------------------------------
| ---------- |
+| Property Name | Description
| Example Value |
+| dfs.ha.namenodes.ns1 | The NameNode identifiers associated with the ns1
namespace | nn1,nn2 |
+| dfs.ha.namenodes.ns2 | The NameNode identifiers associated with the ns2
namespace | nn3,nn4 |
+
+For each namenode name enumerated by each of these properties, there are other
properties defined, for specifying the associated host addresses.
+
+| ------- | ---------------------------------------------------- |
---------------------- |
+| Property Name | Description | Example
Value |
+| dfs.namenode.http-address.ns1.nn1 | The HTTP host address of nn1 NameNode
in the ns1 namespace | host1:50070 |
+| dfs.namenode.https-address.ns1.nn1 | The HTTPS host address of nn1 NameNode
in the ns1 namespace | host1:50470 |
+| dfs.namenode.http-address.ns1.nn2 | The HTTP host address of nn2 NameNode
in the ns1 namespace | host2:50070 |
+| dfs.namenode.https-address.ns1.nn2 | The HTTPS host address of nn2 NameNode
in the ns1 namespace | host2:50470 |
+| dfs.namenode.http-address.ns2.nn3 | The HTTP host address of nn3 NameNode
in the ns2 namespace | host3:50070 |
+| dfs.namenode.https-address.ns2.nn3 | The HTTPS host address of nn3 NameNode
in the ns2 namespace | host3:50470 |
+| dfs.namenode.http-address.ns2.nn4 | The HTTP host address of nn4 NameNode
in the ns2 namespace | host4:50070 |
+| dfs.namenode.https-address.ns2.nn4 | The HTTPS host address of nn4 NameNode
in the ns2 namespace | host4:50470 |
+
+So, if Knox should proxy the NameNodes associated with *ns1*, and the
configuration does not dictate HTTPS, then the WEBHDFS service must
+contain URLs based on the values of *dfs.namenode.http-address.ns1.nn1* and
*dfs.namenode.http-address.ns1.nn2*. Likewise, if Knox should
+proxy the NameNodes associated with *ns2*, the WEBHDFS service must contain
URLs based on the values of *dfs.namenode.http-address.ns2.nn3*
+and *dfs.namenode.http-address.ns2.nn3*.
+
+Fortunately, for Ambari-managed clusters,
[descriptors](#Simplified+Descriptor+Files) and service discovery can handle
this complexity for administrators.
+In the descriptor, the service can be declared without any endpoints, and the
desired namespace can be specified to disambiguate which endpoint(s)
+should be proxied by way of a parameter named *discovery-namespace*.
+
+ "services": [
+ {
+ "name": "WEBHDFS",
+ "params": {
+ "discovery-nameservice": "ns2"
+ }
+ },
+
+If no namespace is specified, then the default namespace will be applied. This
default namespace is derived from the value of the
+property named *fs.defaultFS* defined in the HDFS *core-site.xml*
configuration.
+
+<br>
+
#### WebHDFS URL Mapping ####
For Name Node URLs, the mapping of Knox Gateway accessible WebHDFS URLs to
direct WebHDFS URLs is simple.
