| Interface | Description | 
|---|---|
| IDataLoader | an IDataLoader loads data on demand | 
| Class | Description | 
|---|---|
| BufferPullee<IK,IV> | load data into a buffer signaled by a  BufferPuller | 
| BufferPuller | actively signal a  BufferPulleeto load data into buffer and receive | 
| BufferPushee<OK,OV> | collect data when signaled | 
| BufferPusher<K,V> | actively push data into a buffer and signal a  BufferPusheeto collect it | 
| NativeCollectorOnlyHandler<K,V> | Java Record Reader + Java Mapper + Native Collector | 
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