Interface DNSToSwitchMapping
- All Known Implementing Classes:
AbstractDNSToSwitchMapping
,AlternateRackDNSToSwitchMapping
,DefaultRackDNSToSwitchMapping
public interface DNSToSwitchMapping
An interface that must be implemented to allow pluggable DNS-name/IP-address to RackID resolvers.
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Field Summary
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Method Summary
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Field Details
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DEFAULT_RACK
- See Also:
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Method Details
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resolve
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
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