Configuring HiveServer high availability using a load balancer
To enable high availability for multiple HiveServer (HS2) hosts, you need to know how to configure a load balancer to manage them. First, you configure the Hive Delegation Token Store, next you add HS2 roles, and finally, you configure the load balancer.
HiveServer HA does not automatically fail and retry long-running Hive queries. If any of the HS2 instances fail, all queries running on that instance fail and are not retried. The client application must re-submit the queries.
After you enable HS2 high availability, ensure that all your clients reflect the load balancer's principal in the connection string. On Kerberos-enabled clusters, you must use the load balancer's principal to connect to HS2 directly; otherwise, after you enable HS2 high availability, direct connections to HS2 instances fail.
