1. How to change the JDK Version for an Existing Cluster

Re-run Ambari Server Setup.
ambari-server setup
At the prompt to change the JDK, Enter y.
Do you want to change Oracle JDK [y/n] (n)? y
At the prompt to choose a JDK, Enter 1 to change the JDK to v1.7.
[1] - Oracle JDK 1.7[2] - Oracle JDK 1.6 [3] - Custom JDK Enter choice: 3
If you choose Oracle JDK 1.7 or Oracle JDK 1.6, the JDK you choose downloads and installs automatically.
If you choose Custom JDK, verify or add the custom JDK path on all hosts in the cluster.
After setup completes, you must restart each component for the new JDK to be used by the Hadoop services.
Using the Ambari Web UI, do the following tasks:
- Restart each component
- Restart each host
- Restart all services

For more information about managing services in your cluster, see Managing Services.

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1. Installing Ambari Agents Manually1.  Download the Ambari Repo 
2. Install the Ambari Agents Manually
2. Configuring Ambari for Non-Root1. How to Configure Ambari Server for Non-Root
2. How to Configure an Ambari Agent for Non-Root2.1. Sudoer Configuration
2.2. Customizable Users
2.3. Non-Customizable Users
2.4. Commands
2.5. Sudo Defaults
3. Customizing HDP Services1. Defining Service Users and Groups for a HDP 2.x Stack
2. Setting Properties That Depend on Service Usernames/Groups
4. Configuring Storm for Supervision
5. Using Custom Host Names1. How to Customize the name of a host
6. Moving the Ambari Server1. Back up Current Data
2. Update Agents
3. Install the New Server and Populate the Databases
7. Configuring LZO Compression1. Configure core-site.xml for LZO
2. Running Compression with Hive Queries2.1. Create LZO Files
2.2. Write Custom Java to Create LZO Files
8. Using Non-Default Databases1. Using Non-Default Databases - Ambari1.1. Using Ambari with Oracle
1.2. Using Ambari with MySQL
1.3. Using Ambari with PostgreSQL
1.4. Troubleshooting Ambari1.4.1. Problem: Ambari Server Fails to Start: No Driver1.4.1.1. Solution
1.4.2. Problem: Ambari Server Fails to Start: No Connection1.4.2.1. Solution
1.4.3. Problem: Ambari Server Fails to Start: Bad Username1.4.3.1. Solution
1.4.4. Problem: Ambari Server Fails to Start: No Schema1.4.4.1. Solution
2. Using Non-Default Databases - Hive2.1. Using Hive with Oracle
2.2. Using Hive with MySQL
2.3. Using Hive with PostgreSQL
2.4. Troubleshooting Hive2.4.1. Problem: Hive Metastore Install Fails Using Oracle2.4.1.1. Solution
2.4.2. Problem: Install Warning when "Hive Check Execute" Fails Using
          Oracle2.4.2.1. Solution
2.4.3. Problem: Hive Check Execute may fail after completing an Ambari upgrade to version
          1.4.2 2.4.3.1. Solution
3. Using Non-Default Databases - Oozie3.1. Using Oozie with Oracle
3.2. Using Oozie with MySQL
3.3. Using Oozie with PostgreSQL
3.4. Troubleshooting Oozie3.4.1. Problem: Oozie Server Install Fails Using MySQL3.4.1.1. Solution
3.4.2. Problem: Oozie Server Install Fails Using Oracle or MySQL3.4.2.1. Solution
9. Setting up an Internet Proxy Server for Ambari1. How To Set Up an Internet Proxy Server for Ambari
10. Configuring Network Port Numbers1. Default Network Port Numbers - Ambari
2. Optional: Changing the Default Ambari Server Port
11. Changing the JDK Version on an Existing Cluster1. How to change the JDK Version for an Existing Cluster
12. Using Ambari Blueprints
13. Configuring HDP Stack Repositories for Red Hat Satellite1. How To Configure HDP Stack Repositories for Red Hat Satellite
14. Tuning Ambari Performance
15. Using Ambari Views1. Tez View1.1. Configuring Tez in Your Cluster
1.2. Deploying the Tez View
1.3. Hive SQL on Tez - DAG, Vertex and Task
1.4. Identify the Tez DAG for your job
1.5. Better Understand How your Job is being Executed
1.6. Identify the Cause of a Failed Job
1.7. See Details of Failing Tasks
1.8. Identify the Cause of a Slow-Performing Job
1.9. Counters at Vertex and Task Level
1.10. Monitor Task Progress for a Job
2. Using the Jobs View2.1. Deploying the Jobs View
3. Using the Slider View3.1. Deploying the Slider View

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