| Interface | Description | 
|---|---|
| Matcher | A matcher interface for matching nodes. | 
| Class | Description | 
|---|---|
| Dispatcher.DBlock | A class for keeping track of block locations in the dispatcher. | 
| Dispatcher.DDatanode | A class that keeps track of a datanode. | 
| Dispatcher.StorageGroupMap<G extends Dispatcher.DDatanode.StorageGroup> | |
| MovedBlocks<L> | This window makes sure to keep blocks that have been moved within a fixed
 time interval (default is 1.5 hour). | 
| MovedBlocks.Locations<L> | A class for keeping track of a block and its locations | 
| Enum | Description | 
|---|---|
| ExitStatus | Exit status - The values associated with each exit status is directly mapped
 to the process's exit code in command line. | 
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