| Package | Description | 
|---|---|
| io.druid.server.lookup | |
| io.druid.server.lookup.jdbc | 
| Class and Description | 
|---|
| DataFetcher
 This class will be used to pull data from a given lookup table. 
 | 
| LoadingLookup
 Loading  lookup will load the key\value pair upon request on the key it self, the general algorithm is load key if absent. 
 | 
| PollingLookup | 
| Class and Description | 
|---|
| DataFetcher
 This class will be used to pull data from a given lookup table. 
 | 
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