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- task id: TaskID object.
- startTime: System.currentTimeMillis()
- partition: The _i_th numBSPTasks
- RawSplit: The _i_th RawSplit if RawSplit not null
- SuccessfulTaskId: Set when TaskInProgress.completed() is called. TODO: isSuccessful
- firstTaskId: The first task id.
- currentTaskId:
- TaskStatus:
- Phase: Denote at which phase current task is. See Task Phase below.
- State: Denote the current state the task is. See Task State below.
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