Search Java Classes and Packages
#Org.apache.hadoop.mapreduce Classes and Interfaces - 162 results found.
| Name | Description | Type | Package | Framework |
| AbstractCounters | An abstract class to provide common implementation for the Counters container in both mapred and mapreduce packages. | Class | org.apache.hadoop.mapreduce.counters | Apache Hadoop |
| ArrayListBackedIterator | This class provides an implementation of ResetableIterator. | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| BigDecimalSplitter | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop | |
| BinaryPartitioner | Partition BinaryComparable keys using a configurable part of the bytes array returned by BinaryComparable. | Class | org.apache.hadoop.mapreduce.lib.partition | Apache Hadoop |
| BooleanSplitter | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop | |
| CancelDelegationTokenRequest | Interface | org.apache.hadoop.mapreduce.v2.api.protocolrecords | Apache Hadoop | |
| ChainMapper | The ChainMapper class allows to use multiple Mapper classes within a single The Mapper classes are invoked in a chained (or piped) fashion, the output of | Class | org.apache.hadoop.mapreduce.lib.chain | Apache Hadoop |
| ChainReducer | The ChainReducer class allows to chain multiple Mapper classes after a Reducer within the Reducer task. | Class | org.apache.hadoop.mapreduce.lib.chain | Apache Hadoop |
| Checkpointable | Contract representing to the framework that the task can be safely preempted and restarted between invocations of the user-defined function. | Class | org.apache.hadoop.mapreduce.task.annotation | Apache Hadoop |
| CLI | Class | org.apache.hadoop.mapreduce.tools | Apache Hadoop | |
| Cluster | Provides a way to access information about the map/reduce cluster. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| ClusterMetrics | Status information on the current state of the Map-Reduce cluster. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| CombineFileInputFormat | An abstract InputFormat that returns CombineFileSplit's in InputFormat. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| CombineFileRecordReader | A generic RecordReader that can hand out different recordReaders for each chunk in a CombineFileSplit. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| CombineFileRecordReaderWrapper | A wrapper class for a record reader that handles a single file split. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| CombineFileSplit | A sub-collection of input files. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| CombineSequenceFileInputFormat | Input format that is a CombineFileInputFormat-equivalent for SequenceFileInputFormat. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| CombineTextInputFormat | Input format that is a CombineFileInputFormat-equivalent forSee Also:CombineFileInputFormat | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| ComposableInputFormat | Refinement of InputFormat requiring implementors to provide ComposableRecordReader instead of RecordReader. | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| ComposableRecordReader | Additional operations required of a RecordReader to participate in a join. | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| CompositeInputFormat | An InputFormat capable of performing joins over a set of data sources sorted and partitioned the same way. | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| CompositeInputSplit | This InputSplit contains a set of child InputSplits. | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| CompositeRecordReader | A RecordReader that can effect joins of RecordReaders sharing a common key type and partitioning. | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| ControlledJob | This class encapsulates a MapReduce job and its dependency. | Class | org.apache.hadoop.mapreduce.lib.jobcontrol | Apache Hadoop |
| Counter | A named counter that tracks the progress of a map/reduce job. | Interface | org.apache.hadoop.mapreduce | Apache Hadoop |
| CounterGroup | A group of Counters that logically belong together. | Interface | org.apache.hadoop.mapreduce | Apache Hadoop |
| CounterGroupBase | The common counter group interface. | Interface | org.apache.hadoop.mapreduce.counters | Apache Hadoop |
| Counters | Counters holds per job/task counters, defined either by the Map-Reduce framework or applications. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| DataDrivenDBInputFormat | A InputFormat that reads input data from an SQL table. | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop |
| DataDrivenDBRecordReader | A RecordReader that reads records from a SQL table, using data-driven WHERE clause splits. | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop |
| DateSplitter | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop | |
| DBConfiguration | A container for configuration property names for jobs with DB input/output. | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop |
| DBInputFormat | A InputFormat that reads input data from an SQL table. | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop |
| DBOutputFormat | A OutputFormat that sends the reduce output to a SQL table. | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop |
| DBRecordReader | A RecordReader that reads records from a SQL table. | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop |
| DBSplitter | DBSplitter will generate DBInputSplits to use with DataDrivenDBInputFormat. | Interface | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop |
| DBWritable | Objects that are read from/written to a database should implement DBWritable. | Interface | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop |
| DoubleValueSum | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop | |
| FieldSelectionHelper | This class implements a mapper/reducer class that can be used to perform field selections in a manner similar to unix cut. | Class | org.apache.hadoop.mapreduce.lib.fieldsel | Apache Hadoop |
| FieldSelectionMapper | This class implements a mapper class that can be used to perform field selections in a manner similar to unix cut. | Class | org.apache.hadoop.mapreduce.lib.fieldsel | Apache Hadoop |
| FieldSelectionReducer | This class implements a reducer class that can be used to perform field selections in a manner similar to unix cut. | Class | org.apache.hadoop.mapreduce.lib.fieldsel | Apache Hadoop |
| FileInputFormat | A base class for file-based InputFormats. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| FileInputFormatCounter | enum FileInputFormatCounterEnum Constant Summary | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| FileOutputCommitter | An OutputCommitter that commits files specified in job output directory i. | Class | org.apache.hadoop.mapreduce.lib.output | Apache Hadoop |
| FileOutputFormat | A base class for OutputFormats that read from FileSystems. | Class | org.apache.hadoop.mapreduce.lib.output | Apache Hadoop |
| FileOutputFormatCounter | enum FileOutputFormatCounterEnum Constant Summary | Class | org.apache.hadoop.mapreduce.lib.output | Apache Hadoop |
| FileSplit | A section of an input file. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| FilterOutputFormat | FilterOutputFormat is a convenience class that wraps OutputFormat. | Class | org.apache.hadoop.mapreduce.lib.output | Apache Hadoop |
| FixedLengthInputFormat | FixedLengthInputFormat is an input format used to read input files which contain fixed length records. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| FloatSplitter | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop | |
| GetDelegationTokenRequest | Interface | org.apache.hadoop.mapreduce.v2.api.protocolrecords | Apache Hadoop | |
| HashPartitioner | Partition keys by their Object. | Class | org.apache.hadoop.mapreduce.lib.partition | Apache Hadoop |
| HistoryFileManager | Class | org.apache.hadoop.mapreduce.v2.hs | Apache Hadoop | |
| HistoryStorage | Provides an API to query jobs that have finished. | Interface | org.apache.hadoop.mapreduce.v2.hs | Apache Hadoop |
| ID | A general identifier, which internally stores the id as an integer. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| InnerJoinRecordReader | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop | |
| InputFormat | InputFormat describes the input-specification for a The Map-Reduce framework relies on the InputFormat of the | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| InputSampler | Utility for collecting samples and writing a partition file for TotalOrderPartitioner. | Class | org.apache.hadoop.mapreduce.lib.partition | Apache Hadoop |
| InputSplit | InputSplit represents the data to be processed by an individual Mapper. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| IntegerSplitter | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop | |
| IntSumReducer | Class | org.apache.hadoop.mapreduce.lib.reduce | Apache Hadoop | |
| 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 | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| InverseMapper | A Mapper that swaps keys and values. | Class | org.apache.hadoop.mapreduce.lib.map | Apache Hadoop |
| Job | The job submitter's view of the Job. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| JobContext | Interface | org.apache.hadoop.mapreduce | Apache Hadoop | |
| JobControl | This class encapsulates a set of MapReduce jobs and its dependency. | Class | org.apache.hadoop.mapreduce.lib.jobcontrol | Apache Hadoop |
| JobCounter | Class | org.apache.hadoop.mapreduce | Apache Hadoop | |
| JobID | JobID represents the immutable and unique identifier for the job. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| JobPriority | Used to describe the priority of the running job. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| JobStatus | Describes the current status of a job. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| JoinRecordReader | Base class for Composite joins returning Tuples of arbitrary Writables. | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| KeyFieldBasedComparator | This comparator implementation provides a subset of the features provided by the Unix/GNU Sort. | Class | org.apache.hadoop.mapreduce.lib.partition | Apache Hadoop |
| KeyFieldBasedPartitioner | Defines a way to partition keys based on certain key fields (also see KeyFieldBasedComparator. | Class | org.apache.hadoop.mapreduce.lib.partition | Apache Hadoop |
| KeyValueLineRecordReader | This class treats a line in the input as a key/value pair separated by a separator character. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| KeyValueTextInputFormat | An InputFormat for plain text files. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| LazyOutputFormat | A Convenience class that creates output lazily. | Class | org.apache.hadoop.mapreduce.lib.output | Apache Hadoop |
| LongSumReducer | Class | org.apache.hadoop.mapreduce.lib.reduce | Apache Hadoop | |
| LongValueMax | This class implements a value aggregator that maintain the maximum of a sequence of long values. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| LongValueMin | This class implements a value aggregator that maintain the minimum of a sequence of long values. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| LongValueSum | This class implements a value aggregator that sums up a sequence of long values. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| MapContext | The context that is given to the Mapper. | Interface | org.apache.hadoop.mapreduce | Apache Hadoop |
| MapFileOutputFormat | Class | org.apache.hadoop.mapreduce.lib.output | Apache Hadoop | |
| Mapper | Maps input key/value pairs to a set of intermediate key/value pairs. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| MarkableIterator | MarkableIterator is a wrapper iterator class that implements the MarkableIteratorInterface. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| MultiFilterRecordReader | Base class for Composite join returning values derived from multiple sources, but generally not tuples. | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| MultipleInputs | This class supports MapReduce jobs that have multiple input paths with a different InputFormat and Mapper for each path | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| MultipleOutputs | The MultipleOutputs class simplifies writing output data to multiple outputs | Class | org.apache.hadoop.mapreduce.lib.output | Apache Hadoop |
| MultithreadedMapper | Multithreaded implementation for @link org. | Class | org.apache.hadoop.mapreduce.lib.map | Apache Hadoop |
| MySQLDataDrivenDBRecordReader | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop | |
| MySQLDBRecordReader | A RecordReader that reads records from a MySQL table. | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop |
| NLineInputFormat | NLineInputFormat which splits N lines of input as one split. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| NullOutputFormat | Consume all outputs and put them in /dev/null. | Class | org.apache.hadoop.mapreduce.lib.output | Apache Hadoop |
| OracleDataDrivenDBInputFormat | A InputFormat that reads input data from an SQL table in an Oracle db. | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop |
| OracleDataDrivenDBRecordReader | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop | |
| OracleDateSplitter | Make use of logic from DateSplitter, since this just needs to use some Oracle-specific functions on the formatting end when generating | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop |
| OracleDBRecordReader | A RecordReader that reads records from an Oracle SQL table. | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop |
| OuterJoinRecordReader | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop | |
| OutputCommitter | OutputCommitter describes the commit of task output for a The Map-Reduce framework relies on the OutputCommitter of | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| OutputFormat | OutputFormat describes the output-specification for a The Map-Reduce framework relies on the OutputFormat of the | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| OverrideRecordReader | Prefer the "rightmost" data source for this key. | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| Parser | Very simple shift-reduce parser for join expressions. | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| Parser .Node | Class | org.apache.hadoop.mapreduce.lib.join.Parser | Apache Hadoop | |
| Parser .NodeToken | Class | org.apache.hadoop.mapreduce.lib.join.Parser | Apache Hadoop | |
| Parser .NumToken | Class | org.apache.hadoop.mapreduce.lib.join.Parser | Apache Hadoop | |
| Parser .StrToken | Class | org.apache.hadoop.mapreduce.lib.join.Parser | Apache Hadoop | |
| Parser .Token | Tagged-union type for tokens from the join expression. | Class | org.apache.hadoop.mapreduce.lib.join.Parser | Apache Hadoop |
| Parser .TType | Class | org.apache.hadoop.mapreduce.lib.join.Parser | Apache Hadoop | |
| PartialFileOutputCommitter | An OutputCommitter that commits files specified in job output directory i. | Class | org.apache.hadoop.mapreduce.lib.output | Apache Hadoop |
| PartialOutputCommitter | Interface for an OutputCommitter implementing partial commit of task output, as during preemption. | Interface | org.apache.hadoop.mapreduce.lib.output | Apache Hadoop |
| Partitioner | Partitions the key space. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| QueueAclsInfo | Class | org.apache.hadoop.mapreduce | Apache Hadoop | |
| QueueInfo | Class that contains the information regarding the Job Queues which are maintained by the Hadoop Map/Reduce framework. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| QueueState | Enum representing queue stateEnum Constant Summary | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| RecordReader | Class | org.apache.hadoop.mapreduce | Apache Hadoop | |
| RecordWriter | RecordWriter writes the output | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| ReduceContext | The context passed to the Reducer. | Interface | org.apache.hadoop.mapreduce | Apache Hadoop |
| Reducer | Reduces a set of intermediate values which share a key to a smaller set of Reducer implementations | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| RegexMapper | A Mapper that extracts text matching a regular expression. | Class | org.apache.hadoop.mapreduce.lib.map | Apache Hadoop |
| RenewDelegationTokenRequest | The request issued by the client to renew a delegation token from the ResourceManager. | Interface | org.apache.hadoop.mapreduce.v2.api.protocolrecords | Apache Hadoop |
| RenewDelegationTokenResponse | The response to a renewDelegationToken call to the ResourceManager. | Interface | org.apache.hadoop.mapreduce.v2.api.protocolrecords | Apache Hadoop |
| ResetableIterator | This defines an interface to a stateful Iterator that can replay elements added to it directly. | Interface | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| SequenceFileAsBinaryInputFormat | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop | |
| SequenceFileAsBinaryOutputFormat | An OutputFormat that writes keys, values to SequenceFiles in binary(raw) format | Class | org.apache.hadoop.mapreduce.lib.output | Apache Hadoop |
| SequenceFileAsTextInputFormat | This class is similar to SequenceFileInputFormat, except it generates SequenceFileAsTextRecordReader which converts the input keys and values | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| SequenceFileAsTextRecordReader | This class converts the input keys and values to their String forms by calling toString() method. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| SequenceFileInputFilter | A class that allows a map/red job to work on a sample of sequence files. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| SequenceFileInputFormat | An InputFormat for SequenceFiles. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| SequenceFileOutputFormat | An OutputFormat that writes SequenceFiles. | Class | org.apache.hadoop.mapreduce.lib.output | Apache Hadoop |
| SequenceFileRecordReader | An RecordReader for SequenceFiles. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| StreamBackedIterator | This class provides an implementation of ResetableIterator. | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| StringValueMax | This class implements a value aggregator that maintain the biggest of a sequence of strings. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| StringValueMin | This class implements a value aggregator that maintain the smallest of a sequence of strings. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| TaskAttemptContext | The context for task attempts. | Interface | org.apache.hadoop.mapreduce | Apache Hadoop |
| TaskAttemptID | TaskAttemptID represents the immutable and unique identifier for a task attempt. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| TaskCompletionEvent | Class | org.apache.hadoop.mapreduce | Apache Hadoop | |
| TaskCompletionEvent .Status | Task Event Attempt failed but there are attempts remaining. | Class | org.apache.hadoop.mapreduce.TaskCompletionEvent | Apache Hadoop |
| TaskCounter | Class | org.apache.hadoop.mapreduce | Apache Hadoop | |
| TaskID | TaskID represents the immutable and unique identifier for a Map or Reduce Task. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| TaskInputOutputContext | A context object that allows input and output from the task. | Interface | org.apache.hadoop.mapreduce | Apache Hadoop |
| TaskTrackerInfo | Information about TaskTracker. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| TaskType | Enum for map, reduce, job-setup, job-cleanup, task-cleanup task types. | Class | org.apache.hadoop.mapreduce | Apache Hadoop |
| TextInputFormat | An InputFormat for plain text files. | Class | org.apache.hadoop.mapreduce.lib.input | Apache Hadoop |
| TextOutputFormat | An OutputFormat that writes plain text files. | Class | org.apache.hadoop.mapreduce.lib.output | Apache Hadoop |
| TextSplitter | Class | org.apache.hadoop.mapreduce.lib.db | Apache Hadoop | |
| TokenCache | This class provides user facing APIs for transferring secrets from the job client to the tasks. | Class | org.apache.hadoop.mapreduce.security | Apache Hadoop |
| TokenCounterMapper | Tokenize the input values and emit each word with a count of 1. | Class | org.apache.hadoop.mapreduce.lib.map | Apache Hadoop |
| TotalOrderPartitioner | Partitioner effecting a total order by reading split points from an externally generated source. | Class | org.apache.hadoop.mapreduce.lib.partition | Apache Hadoop |
| TupleWritable | Writable type storing multiple Writables. | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| UniqValueCount | This class implements a value aggregator that dedupes a sequence of objects. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| UserDefinedValueAggregatorDescriptor | This class implements a wrapper for a user defined value aggregator descriptor. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| ValueAggregator | This interface defines the minimal protocol for value aggregators. | Interface | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| ValueAggregatorBaseDescriptor | This class implements the common functionalities of the subclasses of ValueAggregatorDescriptor class. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| ValueAggregatorCombiner | This class implements the generic combiner of Aggregate. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| ValueAggregatorDescriptor | This interface defines the contract a value aggregator descriptor must support. | Interface | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| ValueAggregatorJob | This is the main class for creating a map/reduce job using Aggregate framework. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| ValueAggregatorJobBase | This abstract class implements some common functionalities of the the generic mapper, reducer and combiner classes of Aggregate. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| ValueAggregatorMapper | This class implements the generic mapper of Aggregate. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| ValueAggregatorReducer | This class implements the generic reducer of Aggregate. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| ValueHistogram | This class implements a value aggregator that computes the histogram of a sequence of strings. | Class | org.apache.hadoop.mapreduce.lib.aggregate | Apache Hadoop |
| WrappedMapper | A Mapper which wraps a given one to allow custom Mapper. | Class | org.apache.hadoop.mapreduce.lib.map | Apache Hadoop |
| WrappedRecordReader | Proxy class for a RecordReader participating in the join framework. | Class | org.apache.hadoop.mapreduce.lib.join | Apache Hadoop |
| WrappedReducer | A Reducer which wraps a given one to allow for custom Reducer. | Class | org.apache.hadoop.mapreduce.lib.reduce | Apache Hadoop |