| Interface | Description | 
|---|---|
| ApplicationHistoryManager | |
| ApplicationHistoryReader | |
| ApplicationHistoryStore | This class is the abstract of the storage of the application history data. | 
| ApplicationHistoryWriter | It is the interface of writing the application history, exposing the methods
 of writing  ApplicationStartData,ApplicationFinishDataApplicationAttemptStartData,ApplicationAttemptFinishData,ContainerStartDataandContainerFinishData. | 
| Class | Description | 
|---|---|
| ApplicationHistoryClientService | |
| ApplicationHistoryManagerImpl | |
| ApplicationHistoryManagerOnTimelineStore | |
| ApplicationHistoryServer | History server that keeps track of all types of history in the cluster. | 
| FileSystemApplicationHistoryStore | File system implementation of  ApplicationHistoryStore. | 
| MemoryApplicationHistoryStore | In-memory implementation of  ApplicationHistoryStore. | 
| NullApplicationHistoryStore | Dummy implementation of  ApplicationHistoryStore. | 
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