org.apache.hadoop.mapred
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`hadoop 0.20.2-CDH3B4` | Overview | Package | Class | Statistics | Help
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## Package `org.apache.hadoop.mapred`

Removed Classes
`JobShell` | Provide command line parsing for JobSubmission job submission looks like hadoop jar -libjars -archives -files inputjar args
`StatusHttpServer` | A mapred http server.
`StatusHttpServer.TaskGraphServlet` | The servlet that outputs svg graphics for map / reduce task statuses

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` |
`MapReducePolicyProvider` | PolicyProvider for Map-Reduce protocols.
`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.
`RawKeyValueIterator` | `RawKeyValueIterator` is an iterator used to iterate over the raw keys and values during sort/merge of intermediate data.
`TIPStatus` | The states of a TaskInProgress as seen by the JobTracker.
`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.
`TaskGraphServlet` | The servlet that outputs svg graphics for map / reduce task statuses
`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.
Counters.Counter | A counter record comprising its name and value.
Counters.Group | `Group` of counters comprising of counters from a particular counter Enum class.
FileInputFormat | A base class for file-based InputFormat
FileOutputCommitter | An OutputCommitter that commits files specified in job output directory i.e.
FileOutputFormat | A base class for OutputFormat
FileSplit | A section of an input file.
ID | A general identifier which internally stores the id as an integer.
InputFormat | `InputFormat` describes the input-specification for a Map-Reduce job.
InvalidInputException | This class wraps a list of problems with the input so that the user can get a list of problems together instead of finding and fixing them one by one.
InvalidJobConfException | This exception is thrown when jobconf misses some mendatory attributes or value of some attributes is invalid.
IsolationRunner | IsolationRunner is intended to facilitate debugging by re-running a specific task given left-over task files for a (typically failed) past job.
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.
JobClient.TaskStatusFilter |
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.
JobHistory.Listener | Callback interface for reading back log events from JobHistory.
JobHistory.RecordTypes | Record types are identifiers for each line of log in history files.
JobHistory.Task | Helper class for logging or reading back events related to Task's start finish or failure.
JobHistory.Values | This enum contains some of the values commonly used by history log events.
JobID | JobID represents the immutable and unique identifier for the job.
JobPriority | Used to describe the priority of the running job.
JobProfile | A JobProfile is a MapReduce primitive.
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.
JobTracker.State |
KeyValueLineRecordReader | This class treats a line in the input as a key/value pair separated by a separator character.
KeyValueTextInputFormat | An InputFormat for plain text files.
LineRecordReader | Treats keys as offset in file and value as line.
MapFileOutputFormat | An OutputFormat that writes MapFile}s
MapRunnable | Expert: Generic interface for
MapRunner | Default MapRunnable implementation.
Mapper | Maps input key/value pairs to a set of intermediate key/value pairs.
MultiFileInputFormat | An abstract InputFormat that returns i int) method.
MultiFileSplit | A sub-collection of input files.
OutputCollector | Collects the `<key value>` pairs output by an
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.
RecordReader | `RecordReader` reads <key value> pairs from an InputSplit
RecordWriter | `RecordWriter` writes the output <key value> pairs to an output file.
Reducer | Reduces a set of intermediate values which share a key to a smaller set of values.
Reporter | A facility for Map-Reduce applications to report progress and update counters status information etc.
RunningJob | `RunningJob` is the user-interface to query for details on a running Map-Reduce job.
SequenceFileAsBinaryInputFormat | InputFormat reading keys values from SequenceFiles in binary (raw) format.
SequenceFileAsBinaryInputFormat. SequenceFileAsBinaryRecordReader | Read records from a SequenceFile as binary (raw) bytes.
SequenceFileAsBinaryOutputFormat | An OutputFormat that writes keys values to i binary(raw) format
SequenceFileAsTextInputFormat | This class is similar to SequenceFileInputFormat except it generates SequenceFileAsTextRecordReader which converts the input keys and values to their String forms by calling toString() method.
SequenceFileAsTextRecordReader | This class converts the input keys and values to their String forms by calling toString() method.
SequenceFileInputFilter | A class that allows a map/red job to work on a sample of sequence files.
SequenceFileInputFormat | An InputFormat for SequenceFile}s
SequenceFileOutputFormat | An OutputFormat that writes SequenceFile}s
SequenceFileRecordReader | An RecordReader for SequenceFile}s
TaskAttemptContext |
TaskAttemptID | TaskAttemptID represents the immutable and unique identifier for a task attempt.
TaskCompletionEvent.Status |
TaskID | TaskID represents the immutable and unique identifier for a Map or Reduce Task.
TaskLog | A simple logger to handle the task-specific user logs.
TaskLog.LogName | The filter for userlogs.
TaskLogAppender | A simple log4j-appender for the task child's map-reduce system logs.
TaskReport | A report on the state of a task.
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.
TextOutputFormat.LineRecordWriter |

`hadoop 0.20.2-CDH3B4` | Overview | Package | Class | Statistics | Help
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