Package org.apache.hadoop.ha

Interface Summary

ActiveStandbyElector.ActiveStandbyElectorCallback	Callback interface to interact with the ActiveStandbyElector object.
FenceMethod	A fencing method is a method by which one node can forcibly prevent another node from making continued progress.
HAServiceProtocol	Protocol interface that provides High Availability related primitives to monitor and fail-over the service.

Class Summary

HAServiceProtocolHelper	Helper for making HAServiceProtocol RPC calls.
HAServiceTarget	Represents a target of the client side HA administration commands.
ShellCommandFencer	Fencing method that runs a shell command.
SshFenceByTcpPort	This fencing implementation sshes to the target node and uses fuser to kill the process listening on the service's TCP port.

Enum Summary

HAServiceProtocol.HAServiceState

An HA service may be in active or standby state.

Exception Summary

ActiveStandbyElector.ActiveNotFoundException	Exception thrown when there is no active leader
BadFencingConfigurationException	Indicates that the operator has specified an invalid configuration for fencing methods.
FailoverFailedException	Exception thrown to indicate service failover has failed.
HealthCheckFailedException	Exception thrown to indicate that health check of a service failed.
ServiceFailedException	Exception thrown to indicate that an operation performed to modify the state of a service or application failed.