| CheckpointUserData | 
 Checkpoint data representing the state of the basic system export job 
 | 
| ExportJobListener | 
  | 
| ExportPartitionAnalyzer | 
  | 
| ExportPartitionCollector | 
 Final step which is executed after the individual partitions have completed
 or the job has been terminated. 
 | 
| NopWriter | 
For the fast system export implementation, all processing is handled inside the  ResourcePayloadReader
 so the writer here is simply a NOP.  
 | 
| PartitionSummary | 
 The final status of a job partition. 
 | 
| ResourceExportCheckpointAlgorithm | 
 Bulk export fast implementation - custom checkpoint algorithm. 
 | 
| ResourcePayloadData | 
 A container holding the raw payload for a single resource. 
 | 
| ResourcePayloadReader | 
 A high-performance version of the bulk-export job which doesn't support typeFilter and so
 can use a more efficient mechanism to page through the set of resources filtered by _lastModified. 
 | 
| TransientUserData | 
 Used to share state information among partition processing objects
 such as the ResourcePayloadReader and ExportPartitionCollector. 
 |