Package org.apache.hadoop.ha

Interface Summary

Interface	Description
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

Class	Description
HAAdmin.UsageInfo
HAServiceProtocol.StateChangeRequestInfo	Information describing the source for a request to change state.
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

Enum	Description
HAServiceProtocol.HAServiceState	An HA service may be in active or standby state.
HAServiceProtocol.RequestSource

Exception Summary

Exception	Description
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.