| Package | Description | 
|---|---|
| org.apache.hadoop.mapreduce | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | JobIDJobID represents the immutable and unique identifier for 
 the job. | 
| class  | TaskAttemptIDTaskAttemptID represents the immutable and unique identifier for 
 a task attempt. | 
| class  | TaskIDTaskID represents the immutable and unique identifier for 
 a Map or Reduce Task. | 
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