Class DefaultRackDNSToSwitchMapping
java.lang.Object
org.apache.storm.networktopography.AbstractDNSToSwitchMapping
org.apache.storm.networktopography.DefaultRackDNSToSwitchMapping
- All Implemented Interfaces:
DNSToSwitchMapping
This class implements the
DNSToSwitchMapping
interface It returns the DEFAULT_RACK for every host.-
Field Summary
Fields inherited from interface org.apache.storm.networktopography.DNSToSwitchMapping
DEFAULT_RACK
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Constructor Summary
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Method Summary
Methods inherited from class org.apache.storm.networktopography.AbstractDNSToSwitchMapping
dumpTopology, getSwitchMap, isSingleSwitch
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Constructor Details
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DefaultRackDNSToSwitchMapping
public DefaultRackDNSToSwitchMapping()
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Method Details
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resolve
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
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toString
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