| Class | Description | 
|---|---|
| AsyncQueryForwardingServlet | 
 This class does async query processing and should be merged with QueryResource at some point 
 | 
| BrokerQueryResource | |
| ClientInfoResource | |
| ClientQuerySegmentWalker | |
| DirectClientQuerySegmentWalker | |
| DruidNode | |
| GuiceServletConfig | |
| QueryLifecycle | 
 Class that helps a Druid server (broker, historical, etc) manage the lifecycle of a query that it is handling. 
 | 
| QueryLifecycle.QueryResponse | |
| QueryLifecycleFactory | |
| QueryManager | |
| QueryResource | |
| QueryResource.ResponseContext | |
| QueryStats | |
| RequestLogLine | |
| SegmentManager | 
 This class is responsible for managing data sources and their states like timeline, total segment size, and number of
 segments. 
 | 
| SegmentManager.DataSourceState | 
 Represent the state of a data source including the timeline, total segment size, and number of segments. 
 | 
| SetAndVerifyContextQueryRunner | 
 Use this QueryRunner to set and verify Query contexts. 
 | 
| StatusResource | |
| StatusResource.Memory | |
| StatusResource.ModuleVersion | |
| StatusResource.Status | |
| ZkPathsModule | 
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