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Package org.apache.hadoop.mapred

Added Classes
CleanupQueue  
JobTrackerNotYetInitializedException This exception is thrown when the JobTracker is still initializing and not yet operational.
LocalJobRunner Implements MapReduce locally in-process for debugging.
 

Changed Classes and Interfaces
Counters.Group Group of counters comprising of counters from a particular counter Enum class.
JobConf A map/reduce job configuration.
JobEndNotifier  
JobHistory Provides methods for writing to and reading from job history.
JobHistory.HistoryCleaner Delete history files older than one month.
JobHistory.JobInfo Helper class for logging or reading back events related to job start finish or failure.
JobHistory.Keys Job history files contain key="value" pairs where keys belong to this enum.
JobHistory.MapAttempt Helper class for logging or reading back events related to start finish or failure of a Map Attempt on a node.
JobHistory.ReduceAttempt Helper class for logging or reading back events related to start finish or failure of a Map Attempt on a node.
JobInProgress JobInProgress maintains all the info for keeping a Job on the straight and narrow.
JobInProgress.Counter  
JobLocalizer Internal class responsible for initializing the job not intended for users.
JobTracker JobTracker is the central location for submitting and tracking MR jobs in a network environment.
RunningJob RunningJob is the user-interface to query for details on a running Map-Reduce job.