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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
Task.
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