| Package | Description | 
|---|---|
| org.apache.hadoop.mapreduce.v2.hs | |
| org.apache.hadoop.mapreduce.v2.hs.server | |
| org.apache.hadoop.mapreduce.v2.hs.webapp | 
| Class and Description | 
|---|
| HistoryClientService This module is responsible for talking to the
 JobClient (user facing). | 
| HistoryContext | 
| HistoryFileManager This class provides a way to interact with history files in a thread safe
 manor. | 
| HistoryFileManager.HistoryFileInfo | 
| HistoryServerStateStoreService | 
| HistoryServerStateStoreService.HistoryServerState | 
| HistoryStorage Provides an API to query jobs that have finished. | 
| JHSDelegationTokenSecretManager A MapReduce specific delegation token secret manager. | 
| Class and Description | 
|---|
| JobHistory Loads and manages the Job history cache. | 
| Class and Description | 
|---|
| HistoryContext | 
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