Package org.apache.storm.networktopography

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.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final String
    DEFAULT_RACK
     

  • Method Summary

    Modifier and Type
    Method
    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).

  • Field Details

  • Method Details

    • resolve

      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). 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