1. Use Cases and Fail Over Scenarios

This section provides information on the use cases and fail over scenarios for high availability of the HDP Master Services (NameNode and JobTracker).

Use Cases

This solution enables the following Hadoop system administration use cases:

Planned downtime of the HDP Master Service (for maintenance tasks like software or hardware upgrade)
Unplanned failure of the HDP Master Service

Fail over scenarios

The solution deals with the following faults:

HDP Master service failure
HDP Master JVM failure
Hung HDP Master daemon or hung operating system
HDP Master operating system failure
Virtual machine failure
ESXi host failure
Failure of the NIC cards on ESXi hosts.
Network failure between ESXi hosts.
Note
Some double faults are not handled (such as failure of multiple ESXi hosts).

	Note
Some double faults are not handled (such as failure of multiple ESXi hosts).

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