Package org.apache.phoenix.loadbalancer.service

Class LoadBalancer

java.lang.Object

org.apache.phoenix.loadbalancer.service.LoadBalancer

public class LoadBalancer
extends Object

LoadBalancer class is singleton , used by the client to find out about various location of PQS servers. The client needs to configure the HBase-site.xml with the needed properties i.e. location of zookeeper ( or service locator), username, password etc.

Field Summary

Fields

Modifier and Type	Field	Description
protected static final org.slf4j.Logger	LOG

Method Summary

Modifier and Type	Method	Description
List<HostAndPort>	getAllServiceLocation()	return locations of all Phoenix Query Servers in the form of a List of PQS servers
static LoadBalancer	getLoadBalancer()	Return Singleton Load Balancer every single time.
HostAndPort	getSingleServiceLocation()	It returns the location of Phoenix Query Server in form of a HostAndPort (copied from Guava) from the cache.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

LOG

protected static final org.slf4j.Logger LOG

Method Details

getLoadBalancer

public static LoadBalancer getLoadBalancer()

Return Singleton Load Balancer every single time.

Returns:

LoadBalancer

getSingleServiceLocation

public HostAndPort getSingleServiceLocation()
                                     throws Exception

It returns the location of Phoenix Query Server in form of a HostAndPort (copied from Guava) from the cache. The client should catch Exception incase the method is unable to fetch PQS location due to network failure or in-correct configuration issues.

Returns:

- return HostAndPort

Throws:

Exception

getAllServiceLocation

public List<HostAndPort> getAllServiceLocation()
                                        throws Exception

return locations of all Phoenix Query Servers in the form of a List of PQS servers

Returns:

- HostAndPort

Throws:

Exception