org.apache.hadoop.hive.registry

Interface ServiceInstanceSet<InstanceType extends ServiceInstance>

All Known Subinterfaces:

HiveServer2HAInstanceSet, LlapServiceInstanceSet

All Known Implementing Classes:

HS2ActivePassiveHARegistry

public interface ServiceInstanceSet<InstanceType extends ServiceInstance>

Note: For most of the implementations, there's no guarantee that the ServiceInstance returned by one invocation is the same as the instance returned by another invocation. e.g. the ZK registry returns a new ServiceInstance object each time a getInstance call is made.

Method Summary

Modifier and Type	Method and Description
Collection<InstanceType>	getAll() Get an instance mapping which map worker identity to each instance.
Set<InstanceType>	getByHost(String host) Get a list of service instances for a given host.
InstanceType	getInstance(String name) Get an instance by worker identity.
int	size() Get number of instances in the currently available.

Method Detail

getAll

Collection<InstanceType> getAll()

Get an instance mapping which map worker identity to each instance. The worker identity does not collide between restarts, so each restart will have a unique id, while having the same host/ip pair.

Returns:

instance list

getInstance

InstanceType getInstance(String name)

Get an instance by worker identity.

Parameters:

name - worker id

Returns:

instance

getByHost

Set<InstanceType> getByHost(String host)

Get a list of service instances for a given host. The list could include dead and alive instances.

Parameters:

host - hostname

Returns:

instance list

size

int size()

Get number of instances in the currently available.

Returns:

- number of instances