Ambari Views - Overview

Ambari UX So Far…
Mostly for addressing “Operator” Concerns
Host went
down!
Disk is full!
Need to
tweak
configs
The
DataNodes
are down!
Need to
add hosts
Need to
secure
cluster
Need
NameNode
HA

Ambari UX So Far…
Some for addressing “Data Worker” Concerns
Hmm…why is
my query slow?

Across Hadoop…a whole bunch of
other UIs out there!
You may have used…
• Native UIs for various Hadoop ecosystem components:
MapReduce Job History, NameNode, ResourceManager,
HBase, Storm, Oozie, Falcon, etc.
• Hue
• Ambrose (Twitter)
• White Elephant (LinkedIn)
• Lipstick (Netflix)
• …and so on
!@#$

Ambari: Common UX for Hadoop
Provide a common, secure and pluggable
approach for UX across:
• Operators, System Admin
• Data Workers
• Application Developers
• …and others
Yay!
Yay!

Ambari Views: Goals
Single point of entry
✔ Common URL for common user communities
✔ “Views” embedded in Ambari UI
Pluggable UI Framework
✔ “Views” contributed and shared as plugins
✔ No code changes to the core
✔ Browse published Views and install

Ambari Views: Goals
Authorization
✔ Control who can access which views and which
aspects of views
✔ Deployment model supports connecting to different
LDAP/ADs by user community
Runs on Ambari Server
✔ No extra daemons needed
Runs Ambari “standalone”
✔ No need to deploy cluster via Ambari to use Views

Example Views
Operators
• Capacity Scheduler
Queue Manager
• YARN Resource Utilization
• Heatmaps
• HDFS / Hive Mirroring
Data Workers
• Pig Query Editor
• Hive Query Editor
• Workflow Design
• HDFS File Browser
• Hive/Tez
Visualization
Application Developers
• Job Visualization
• Streaming Topology Visualization

Views and the Framework
Views Framework
Views
Core to Ambari
Plugins to Ambari

Components of a View
VIEW
Client-side
assets
(.js, html)
AMBARI WEB
VIEW
Server-side
resources
(java)
AMBARI SERVER
{rest}
Hadoop
and other
systems

View Packaging
• View descriptor : view.xml
• Resource / Service classes : JAX-RS annotated
• UI classes : html, Servlets deployed as web app (WEB-INF/web.xml).
• Application logic : Supporting classes
• Dependencies : 3rd party jars or classes
├── WEB-INF
│ └── web.xml
├── org
│ └── apache
│ └── ambari
│ └── view
│ └── filebrowser
│ ├── DownloadService.class
│ ├── FileBrowserService.class
│ └── FileOperationService.class
└── view.xml
Page 11

View Versions + Instances
• Multiple versions of a View
• Multiple View Instances of each version
View Name
View
Instances
View
Versions
View
Versions
View
Instances
View
Instances
View
Instances

• View Context
– View and user information
• Instance Data
– Lightweight name/value (for prefs)
• Events
– Framework and Custom events
Framework Services
Client-Side Server-Side
ViewContext.getUsername()
ViewContext.getInstanceData()
ViewController.fireEvent()

View Events
• Server-side Framework and Custom events
onDeploy(), onCreate(), onDestroy()
Develop Deploy
Create
instances
Package
onDeploy() onCreate()
onDestroy()

Authentication
VIEW
AMBARI SERVER
Ambari
DB
LDAP
{rest}
<html>
User AuthN Source
User-Permission
Mapping
Authenticate
Provide principal
via ViewContext

Views Deployment
• Deploy Views as part of an operational Ambari Server
• Or deploy standalone “Ambari Views Server” for data
workers
Page 16
Ambari
Server
HADOOP
Store & Process
Ambari
Views
Server
Operators
manage the
cluster, may
have Views
deployed
Data Workers
use the cluster
and use the
Ambari Views
Server for
Views (no
agents)

Learn More
• Framework
https://github.com/apache/ambari/tree/trunk/ambari-views
https://github.com/apache/ambari/blob/trunk/ambari-
views/docs/index.md
• Framework Examples
https://github.com/apache/ambari/tree/trunk/ambari-
views/examples
• View Contribs
https://github.com/apache/ambari/tree/trunk/contrib/views

© Hortonworks Inc. 2014
The Deployed View
Page 19
• Views are deployed by placing the view package in the
Ambari view folder.
• Once deployed, views and view instances are available
through the Ambari REST API.
GET http://c6401.ambari.apache.org:8080/api/v1/views/WEATHER/
{
"href" : "http://c6401.ambari.apache.org:8080/api/v1/views/",
"items" : [
{
"href" : "http://c6401.ambari.apache.org:8080/api/v1/views/WEATHER",
"ViewInfo" : {
"view_name" : "WEATHER"
}
}
]
}

View Descriptor : view.xml
Page 20
• name – the internal name of the view (must be unique)
• label – the public display name of the view
• version – the version of the view
• parameter – metadata about view instance properties
• resource – the names of the classes required to support a view
sub-resource
• instance – optional property sets which define view instances.
<view>
<name>MYVIEW</name>
<label>My View</label>
<version>1.0.0</version>
<parameter>
<name>scope</name>
<description>The scope of the instance.</description>
<required>true</required>
</parameter>
</view>

View Descriptor : parameter
Page 21
• Values for view parameters are given as properties when a
view instance is defined.
–name – the name of the parameter
–description – a brief description of the parameter
–required – indicates whether the parameter is required for instance
definition
<view>
…
<parameter>
<name>scope</name>
</parameter>
<instance>
<name>GLOBAL_INSTANCE</name>
<property>
<key>scope</key>
<value>global</value>
</instance>
</view>

View Descriptor : instance
Page 22
• Values for view parameters are given as properties when
a view instance is defined.
• Multiple instance may be defined for a view.
–name – the name of the instance
–property– key / value pair. Name should match a view parameter.
<view>
…
<parameter>
<name>scope</name>
</parameter>
<instance>
<name>GLOBAL_INSTANCE</name>
<property>
<key>scope</key>
<value>global</value>
</instance>
</view>

View Descriptor : resource
Page 23
• The defined resources of a view plug into the Ambari REST
API.
–name – the name of the resource
–plural-name – the plural name as represented in the API
–id-property – the identifying property of the resource
–resource-class – the JavaBean resource class
–provider-class – the ResourceProvider implementation
–service-class – the JAX-RS annotated resource service class
<view>
…
<resource>
<name>city</name>
<plural-name>cities</plural-name>
<id-property>id</id-property>
<resource-class>org.apache.ambari.view.weather.CityResource</resource-class>
<provider-class>org.apache.ambari.view.weather.CityResourceProvider</provider-class>
<service-class>org.apache.ambari.view.weather.CityService</service-class>
</resource>
</view>

Page 24
A resource class can be any JavaBean. The resource
instances will be provided by an implementation of a
ResourceProvider, which is written by the view developer.
public class CityResource {
private String id;
private Map<String, Object> weather;
private String units;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
…
}

Page 25
A resource provider class should implement
ResourceProvider. Note the injected ViewContext in the
following example…
public class CityResourceProvider implements ResourceProvider<CityResource> {
@Inject
ViewContext viewContext;
@Override
public CityResource getResource(String resourceId, Set<String> propertyIds) throws
SystemException, NoSuchResourceException, UnsupportedPropertyException {
Map<String, String> properties = viewContext.getProperties();
String units = properties.get("units");
try {
return getResource(resourceId, units, propertyIds);
} catch (IOException e) {
throw new SystemException("Can't get city resource " + resourceId + ".", e);
}
}
…
}

Page 26
A resource service class should be annotated with JAX-RS
annotations to handle service requests. Note the injected
ViewResourceHandler in the following example…
public class CityService {
@Inject
ViewResourceHandler resourceHandler;
@GET
@Path("{cityName}")
@Produces({"text/plain", "application/json"})
public Response getCity(@Context HttpHeaders headers, @Context UriInfo ui,
@PathParam("cityName") String cityName) {
return resourceHandler.handleRequest(headers, ui, cityName);
}
…
}

Page 27
The defined resources of a view plug into the Ambari REST
API and are accessed through the given JAX-RS annotated
ResourceProvider implementation.
GET http://c6401.ambari.apache.org:8080/api/v1/views/WEATHER/versions/0.1.0/instances/US_WEST/
{
"ViewInstanceInfo" : {
"instance_name" : "US_WEST",
"view_name" : "WEATHER",
"properties" : {
"cities" : "Palo Alto, US;Los Angeles, US;Portland, US;Seattle, US",
"units" : "imperial"
}
},
"cities" : [
{
"href" : "http://….org:8080/api/v1/views/WEATHER/instances/US_WEST/cities/Los Angeles, US",
"id" : "Los Angeles, US",
"instance_name" : "US_WEST”
},
{
"href" : "http://…:8080/api/v1/views/WEATHER/instances/US_WEST/cities/Palo Alto, US",
"id" : "Palo Alto, US",
"instance_name" : "US_WEST”
},…

View Interfaces: ViewContext
Page 28
• Available to the view components through injection.
• Provides access to the view and instance attributes.
• Provides access to Ambari configuration.
• Provides access to run time information about the current
execution context.
public interface ViewContext {
public String getUsername();
public String getViewName();
public String getInstanceName();
public Map<String, String> getProperties();
public String getAmbariProperty(String key);
public ResourceProvider<?> getResourceProvider(String type);
public URLStreamProvider getURLStreamProvider();
}

View Interfaces : ResourceProvider
Page 29
• Optional SPI.
• Only required if the view defines a resource that needs to be
plugged into the Ambari API framework.
• Used to monitor and manage view sub-resources through
CRUD operations.
• The view developer may choose not to support all operations.
public interface ResourceProvider<T> {
public T getResource(String resourceId, Set<String> properties);
public Set<T> getResources(ReadRequest request;
public void createResource(
String resourceId, Map<String, Object> properties;
public boolean updateResource(
String resourceId, Map<String, Object> properties;
public boolean deleteResource(String resourceId);
}

View UI
Page 30
• Optional.
• A view package may include a WEB-INF/web.xml so that
the view may be deployed as a web app.
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-
app_2_4.xsd"
version="2.4">
<display-name>Weather Application</display-name>
<description>
This is the weather view application.
</description>
<servlet>
<servlet-name>WeatherServlet</servlet-name>
<servlet-class>org.apache.ambari.view.weather.WeatherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>WeatherServlet</servlet-name>
<url-pattern>/ui</url-pattern>
</servlet-mapping>
</web-app>

View UI
Page 31
• Servlet specified in web.xml.
• Note the use of the ViewContext in the following example
…
public class WeatherServlet extends HttpServlet {
private ViewContext viewContext;
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
ServletContext context = config.getServletContext();
viewContext = (ViewContext) context.getAttribute(ViewContext.CONTEXT_ATTRIBUTE);
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException
{
…
PrintWriter writer = response.getWriter();
writer.println("<h1>" + viewContext.getInstanceName() + " Weather</h1>");

View UI
Page 32
• Access View UI.
{
"href" : "http://c6401.ambari.apache.org:8080/api/v1/views/WEATHER/versions/0.1.0/instances/US_WEST/",
"ViewInstanceInfo" : {
"context_path" : "/views/WEATHER/US_WEST",
"instance_name" : "US_WEST",
"view_name" : "WEATHER",
"properties" : {
"cities" : "Palo Alto, US;Los Angeles, US;Portland, US;Seattle, US",
"units" : "imperial"
}
},

Ambari Views - Overview

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