org.apache.hadoop.mapred
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`hadoop 0.20.2-cdh3u0` | Overview | Package | Class | Statistics | Help
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## Package `org.apache.hadoop.mapred`

Added Classes and Interfaces
`AdminOperationsProtocol` | Protocol for admin operations.
`DefaultTaskController` | The default implementation for controlling tasks.
`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.
`JobTrackerMXBean` | The MXBean interface for JobTrackerInfo
`JobTrackerPlugin` | JobTrackerPlugins are found in mapred.jobtracker.plugins and are started and stopped by a PluginDispatcher during JobTracker start-up.
`JvmTask` |
`MapTaskCompletionEventsUpdate` | A class that represents the communication between the tasktracker and child tasks w.r.t the map task completion events.
`Operation` | Generic operation that maps to the dependent set of ACLs that drive the authorization of the operation.
`Task` | Base class for tasks.
`Task.CombineOutputCollector` | OutputCollector for the combiner.
`Task.CombineValuesIterator` |
`Task.CombinerRunner` |
`Task.Counter` |
`Task.NewCombinerRunner` |
`Task.OldCombinerRunner` |
`Task.TaskReporter` |
`TaskController` | Controls initialization finalization and clean up of tasks and also the launching and killing of task JVMs.
`TaskInProgress` | TaskInProgress maintains all the info needed for a Task in the lifetime of its owning Job.
`TaskLogsTruncater` | The class for truncating the user logs.
`TaskStatus` | Describes the current status of a task.
`TaskStatus.Phase` |
`TaskStatus.State` |
`TaskTrackerMXBean` | MXBean interface for TaskTracker
`TaskTrackerStatus` | A TaskTrackerStatus is a MapReduce primitive.
`TaskTrackerStatus.ResourceStatus` | Class representing a collection of resources on this tasktracker.
`TaskUmbilicalProtocol` | Protocol that task child process uses to contact its parent process.
`UserLogCleaner` | This is used only in UserLogManager to manage cleanup of user logs.
`Utils` | A utility class.
`Utils.OutputFileUtils` |
`Utils.OutputFileUtils. OutputFilesFilter` | This class filters output(part) files from the given directory It does not accept files with filenames _logs and _SUCCESS.
`Utils.OutputFileUtils. OutputLogFilter` | This class filters log files from directory given It doesnt accept paths having _logs.

Changed Classes and Interfaces
ClusterStatus | Status information on the current state of the Map-Reduce cluster.
Counters | A set of named counters.
FileInputFormat | A base class for file-based InputFormat
FileOutputCommitter | An OutputCommitter that commits files specified in job output directory i.e.
FileSplit | A section of an input file.
InputFormat | `InputFormat` describes the input-specification for a Map-Reduce job.
InputSplit | `InputSplit` represents the data to be processed by an individual Mapper
InvalidJobConfException | This exception is thrown when jobconf misses some mendatory attributes or value of some attributes is invalid.
JobClient | `JobClient` is the primary interface for the user-job to interact with the JobTracker `JobClient` provides facilities to submit jobs track their progress access component-tasks' reports/logs get the Map-Reduce cluster status information etc.
JobConf | A map/reduce job configuration.
JobContext |
JobHistory | Provides methods for writing to and reading from job history.
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.
JobQueueInfo | Class that contains the information regarding the Job Queues which are maintained by the Hadoop Map/Reduce framework.
JobStatus | Describes the current status of a job.
JobTracker | JobTracker is the central location for submitting and tracking MR jobs in a network environment.
LineRecordReader | Treats keys as offset in file and value as line.
MapRunnable | Expert: Generic interface for
Mapper | Maps input key/value pairs to a set of intermediate key/value pairs.
OutputCommitter | `OutputCommitter` describes the commit of task output for a Map-Reduce job.
OutputFormat | `OutputFormat` describes the output-specification for a Map-Reduce job.
OutputLogFilter | This class filters log files from directory given It doesnt accept paths having _logs.
Partitioner | Partitions the key space.
Reducer | Reduces a set of intermediate values which share a key to a smaller set of values.
RunningJob | `RunningJob` is the user-interface to query for details on a running Map-Reduce job.
SequenceFileInputFormat | An InputFormat for SequenceFile}s
SequenceFileOutputFormat | An OutputFormat that writes SequenceFile}s
TaskAttemptContext |
TaskLog | A simple logger to handle the task-specific user logs.
TaskLogAppender | A simple log4j-appender for the task child's map-reduce system logs.
TaskTracker | TaskTracker is a process that starts and tracks MR Tasks in a networked environment.
TextInputFormat | An InputFormat for plain text files.
TextOutputFormat | An OutputFormat that writes plain text files.

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