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ContainerLogAppender.
ResourceManager and is used to generate 
 the globally unique JobId.
JobId
 which is unique for all applications started by a particular instance
 of the ResourceManager.
JobId represents the globally unique 
 identifier for a MapReduce job.UnsupportedOperationException
TokenIdentifier that identifies delegation tokens 
 issued by JobHistoryServer to delegate
 MR tasks talking to the JobHistoryServer.TaskAttemptId represents the unique identifier for a task
 attempt.TaskId represents the unique identifier for a Map or Reduce
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