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Ambari User's Guide
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Abstract

The Hortonworks Data Platform, powered by Apache Hadoop, is a massively scalable and 100% open source platform for storing, processing and analyzing large volumes of data. It is designed to deal with data from many sources and formats in a very quick, easy and cost-effective manner. The Hortonworks Data Platform consists of the essential set of Apache Hadoop projects including MapReduce, Hadoop Distributed File System (HDFS), HCatalog, Pig, Hive, HBase, ZooKeeper and Ambari. Hortonworks is the major contributor of code and patches to many of these projects. These projects have been integrated and tested as part of the Hortonworks Data Platform release process and installation and configuration tools have also been included.

Unlike other providers of platforms built using Apache Hadoop, Hortonworks contributes 100% of our code back to the Apache Software Foundation. The Hortonworks Data Platform is Apache-licensed and completely open source. We sell only expert technical support, training and partner-enablement services. All of our technology is, and will remain free and open source.

Please visit the Hortonworks Data Platform page for more information on Hortonworks technology. For more information on Hortonworks services, please visit either the Support or Training page. Feel free to Contact Us directly to discuss your specific needs.

Contents

1. Overview: Ambari User's Guide
1. Architecture
1.1. Sessions
2. Accessing Ambari Web
2. Viewing the Ambari Dashboards
1. Viewing the Cluster Dashboard
1.1. Scanning Service Status
1.2. Widget Descriptions
1.3. Widget Details
1.4. Linking to Service UIs
1.5. Viewing Cluster-Wide Metrics
2. Modifying the Cluster Dashboard
2.1. Adding a Widget to the Dashboard
2.2. Resetting the Dashboard
2.3. Customizing Widget Display
3. Viewing Cluster Heatmaps
3. Managing Hosts
1. Working with Hosts
2. Determining Host Status
3. Filtering the Hosts List
4. Performing Host-Level Actions
5. Viewing Components on a Host
6. Decommissioning Masters and Slaves
6.1. How to Decommission a Component
7. How to Delete a Component
8. Deleting a Host from a Cluster
8.1. How to Delete a Host from a Cluster
9. Setting Maintenance Mode
9.1. Setting Maintenance Mode for Services, Components, and Hosts
9.2. How to Turn On Maintenance Mode for a Service
9.3. How to Turn On Maintenance Mode for a Host
9.4. How to Turn On Maintenance Mode for a Host (alternative using filtering for hosts)
9.5. Maintenance Mode Use Cases
10. Adding Hosts to a Cluster
11. Rack Awareness
4. Managing Services
1. Starting and Stopping All Services
2. Selecting a Service
3. Adding a Service
3.1. Adding a Service to your Hadoop cluster
4. Editing Service Config Properties
5. Viewing Service Summary and Alerts
5.1. Alerts and Health Checks
5.2. Modifying the Service Dashboard
6. Performing Service Actions
7. Monitoring Background Operations
8. Using Quick Links
9. Rolling Restarts
9.1. Setting Rolling Restart Parameters
9.2. Aborting a Rolling Restart
10. Managing YARN
10.1. Refreshing YARN Capacity Scheduler
11. Managing HDFS
11.1. Rebalancing HDFS
11.2. Tuning Garbage Collection
5. Managing Service High Availability
1. NameNode High Availability
1.1. How To Configure NameNode High Availability
1.2. How to Roll Back NameNode HA
2. ResourceManager High Availability
2.1. How to Configure ResourceManager High Availability
2.2. How to Disable ResourceManager High Availability
3. HBase High Availability
3.1. Adding an HBase Master Component
4. Hive High Availability
4.1. Adding a Hive Metastore Component
4.2. Adding a HiveServer2 Component
4.3. Adding a WebHCat Component
5. Storm High Availability
5.1. Adding a Nimbus Component
6. Oozie High Availability
6.1. Adding an Oozie Server Component
6. Managing Configurations
1. Configuring Services
1.1. Updating Service Properties
1.2. Restarting Components
2. Using Host Config Groups
3. Customizing Log Settings
4. Downloading Client Configs
5. Service Configuration Versions
5.1. Basic Concepts
5.2. Terminology
5.3. Saving a Change
5.4. Viewing History
5.5. Comparing Versions
5.6. Reverting a Change
5.7. Versioning and Host Config Groups
7. Administering the Cluster
1. Managing Stack and Versions
1.1. Register a Version
1.2. Install the Version
1.3. Perform Upgrade
1.4. Upgrade Prerequisites
2. Service Accounts
3. Kerberos
3.1. How To Regenerate Keytabs
3.2. How To Disable Kerberos
8. Monitoring and Alerts
1. Managing Alerts
1.1. Alert Types
2. Configuring Notifications
2.1. Customizing Notification Templates
3. List of Predefined Alerts
3.1. HDFS Service Alerts
3.2. YARN Alerts
3.3. MapReduce2 Alerts
3.4. HBase Service Alerts
3.5. Hive Alerts
3.6. Oozie Alerts
3.7. ZooKeeper Alerts
3.8. Ambari Alerts
3.9. Ambari Metrics Alerts
9. Using Ambari Metrics
1. AMS Architecture
2. Using Grafana
2.1. Accessing Grafana
2.2. Viewing Grafana Dashboards
2.3. Viewing Selected Metrics on Grafana Dashboards
2.4. Viewing Metrics for Selected Hosts
2.5. HDFS Dashboards
2.6. YARN Dashboards
2.7. HBase Dashboards
2.8. System Dashboards
2.9. Changing the Grafana Admin Password
2.10. Set Up HTTPS for Grafana
3. Performance Tuning
3.1. Metrics Collector Modes
3.2. Aggregated Metrics TTL Settings
3.3. Memory Settings
3.4. General Guidelines
4. Moving the Metrics Collector
5. (Optional) Enabling HBase Region and Table Metrics
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