Apache Ambari Operations
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Chapter 5. Managing Service High Availability

Ambari web provides a wizard-driven user experience that enables you to configure high availability of the components in many Hortonworks Data Platform (HDP) stack services. High availability is assured through establishing primary and secondary components. In the event that the primary component fails or becomes unavailable, the secondary component is available. After configuring high availability for a service, Ambari enables you to manage and disable (roll back) high availability of components in that service.