org.apache.storm.testing

Class AlternateRackDNSToSwitchMapping

java.lang.Object

org.apache.storm.networktopography.AbstractDNSToSwitchMapping

org.apache.storm.testing.AlternateRackDNSToSwitchMapping

All Implemented Interfaces:

DNSToSwitchMapping

public final class AlternateRackDNSToSwitchMapping
extends AbstractDNSToSwitchMapping

This class implements the DNSToSwitchMapping interface It alternates bewteen RACK1 and RACK2 for the hosts.

Field Summary

Fields inherited from interface org.apache.storm.networktopography.DNSToSwitchMapping

DEFAULT_RACK

Constructor Summary

Constructors

Constructor and Description
AlternateRackDNSToSwitchMapping()

Method Summary

Modifier and Type	Method and Description
Map<String,String>	resolve(List<String> names) Resolves a list of DNS-names/IP-address and returns back a map of DNS-name->switch information ( network paths).
String	toString()

Methods inherited from class org.apache.storm.networktopography.AbstractDNSToSwitchMapping

dumpTopology, getSwitchMap, isSingleSwitch

Methods inherited from class java.lang.Object

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

Constructor Detail

AlternateRackDNSToSwitchMapping

public AlternateRackDNSToSwitchMapping()

Method Detail

resolve

public Map<String,String> resolve(List<String> names)

Description copied from interface: DNSToSwitchMapping

Resolves a list of DNS-names/IP-address and returns back a map of DNS-name->switch information ( network paths). Consider an element in the argument list - x.y.com. The switch information that is returned must be a network path of the form /foo/rack, where / is the root, and ‘foo’ is the switch where ‘rack’ is connected. Note the hostname/ip-address is not part of the returned path. The network topology of the cluster would determine the number of components in the network path.

If a name cannot be resolved to a rack, the implementation should return {DEFAULT_RACK}. This is what the bundled implementations do, though it is not a formal requirement.

Parameters:

names - the list of hosts to resolve (can be empty)

Returns:

Map of hosts to resolved network paths. If names is empty, then return empty Map

toString

public String toString()

Overrides:

toString in class Object