Uses of Interface
org.apache.hadoop.io.WritableComparable

Packages that use WritableComparable

Package	Description
org.apache.hadoop.io	Generic i/o code for use when reading and writing data to the network, to databases, and to files.
org.apache.hadoop.mapred
org.apache.hadoop.mapred.join
org.apache.hadoop.mapred.lib.aggregate
org.apache.hadoop.mapreduce
org.apache.hadoop.mapreduce.lib.aggregate
org.apache.hadoop.mapreduce.lib.join
org.apache.hadoop.mapreduce.lib.output
org.apache.hadoop.record	(DEPRECATED) Hadoop record I/O contains classes and a record description language translator for simplifying serialization and deserialization of records in a language-neutral manner.

Uses of WritableComparable in org.apache.hadoop.io

Classes in org.apache.hadoop.io with type parameters of type WritableComparable

Modifier and Type	Class and Description
class	SortedMapWritable<K extends WritableComparable<? super K>> A Writable SortedMap.

Classes in org.apache.hadoop.io that implement WritableComparable

Modifier and Type	Class and Description
class	BooleanWritable A WritableComparable for booleans.
class	BytesWritable A byte sequence that is usable as a key or value.
class	ByteWritable A WritableComparable for a single byte.
class	DoubleWritable Writable for Double values.
class	FloatWritable A WritableComparable for floats.
class	IntWritable A WritableComparable for ints.
class	LongWritable A WritableComparable for longs.
class	MD5Hash A Writable for MD5 hash values.
class	NullWritable Singleton Writable with no data.
class	ShortWritable A WritableComparable for shorts.
class	Text This class stores text using standard UTF8 encoding.
class	VIntWritable A WritableComparable for integer values stored in variable-length format.
class	VLongWritable A WritableComparable for longs in a variable-length format.

Methods in org.apache.hadoop.io that return WritableComparable

Modifier and Type	Method and Description
WritableComparable	WritableComparator.newKey() Construct a new WritableComparable instance.

Methods in org.apache.hadoop.io that return types with arguments of type WritableComparable

Modifier and Type	Method and Description
Class<? extends WritableComparable>	WritableComparator.getKeyClass() Returns the WritableComparable implementation class.

Methods in org.apache.hadoop.io with parameters of type WritableComparable

Modifier and Type	Method and Description
int	WritableComparator.compare(WritableComparable a, WritableComparable b) Compare two WritableComparables.
int	WritableComparator.compare(WritableComparable a, WritableComparable b) Compare two WritableComparables.

Method parameters in org.apache.hadoop.io with type arguments of type WritableComparable

Modifier and Type	Method and Description
static WritableComparator	WritableComparator.get(Class<? extends WritableComparable> c) For backwards compatibility.
static WritableComparator	WritableComparator.get(Class<? extends WritableComparable> c, Configuration conf) Get a comparator for a WritableComparable implementation.

Constructor parameters in org.apache.hadoop.io with type arguments of type WritableComparable

Constructor and Description
WritableComparator(Class<? extends WritableComparable> keyClass) Construct for a WritableComparable implementation.
WritableComparator(Class<? extends WritableComparable> keyClass, boolean createInstances)
WritableComparator(Class<? extends WritableComparable> keyClass, Configuration conf, boolean createInstances)

Uses of WritableComparable in org.apache.hadoop.mapred

Methods in org.apache.hadoop.mapred with type parameters of type WritableComparable

Modifier and Type	Method and Description
static <K extends WritableComparable,V extends Writable> Writable	MapFileOutputFormat.getEntry(org.apache.hadoop.io.MapFile.Reader[] readers, Partitioner<K,V> partitioner, K key, V value) Get an entry from output generated by this class.

Methods in org.apache.hadoop.mapred that return types with arguments of type WritableComparable

Modifier and Type	Method and Description
RecordWriter<WritableComparable,Writable>	MapFileOutputFormat.getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress)
static Class<? extends WritableComparable>	SequenceFileAsBinaryOutputFormat.getSequenceFileOutputKeyClass(JobConf conf) Get the key class for the SequenceFile

Uses of WritableComparable in org.apache.hadoop.mapred.join

Classes in org.apache.hadoop.mapred.join with type parameters of type WritableComparable

Modifier and Type	Interface and Description
interface	ComposableInputFormat<K extends WritableComparable,V extends Writable> Refinement of InputFormat requiring implementors to provide ComposableRecordReader instead of RecordReader.
interface	ComposableRecordReader<K extends WritableComparable,V extends Writable> Additional operations required of a RecordReader to participate in a join.
class	CompositeInputFormat<K extends WritableComparable> An InputFormat capable of performing joins over a set of data sources sorted and partitioned the same way.
class	CompositeRecordReader<K extends WritableComparable,V extends Writable,X extends Writable> A RecordReader that can effect joins of RecordReaders sharing a common key type and partitioning.
class	InnerJoinRecordReader<K extends WritableComparable> Full inner join.
class	JoinRecordReader<K extends WritableComparable> Base class for Composite joins returning Tuples of arbitrary Writables.
class	MultiFilterRecordReader<K extends WritableComparable,V extends Writable> Base class for Composite join returning values derived from multiple sources, but generally not tuples.
class	OuterJoinRecordReader<K extends WritableComparable> Full outer join.
class	OverrideRecordReader<K extends WritableComparable,V extends Writable> Prefer the "rightmost" data source for this key.
class	WrappedRecordReader<K extends WritableComparable,U extends Writable> Proxy class for a RecordReader participating in the join framework.

Uses of WritableComparable in org.apache.hadoop.mapred.lib.aggregate

Classes in org.apache.hadoop.mapred.lib.aggregate with type parameters of type WritableComparable

Modifier and Type	Class and Description
class	ValueAggregatorCombiner<K1 extends WritableComparable,V1 extends Writable> This class implements the generic combiner of Aggregate.
class	ValueAggregatorJobBase<K1 extends WritableComparable,V1 extends Writable> This abstract class implements some common functionalities of the the generic mapper, reducer and combiner classes of Aggregate.
class	ValueAggregatorMapper<K1 extends WritableComparable,V1 extends Writable> This class implements the generic mapper of Aggregate.
class	ValueAggregatorReducer<K1 extends WritableComparable,V1 extends Writable> This class implements the generic reducer of Aggregate.

Uses of WritableComparable in org.apache.hadoop.mapreduce

Classes in org.apache.hadoop.mapreduce that implement WritableComparable

Modifier and Type	Class and Description
class	ID A general identifier, which internally stores the id as an integer.
class	JobID JobID represents the immutable and unique identifier for the job.
class	TaskAttemptID TaskAttemptID represents the immutable and unique identifier for a task attempt.
class	TaskID TaskID represents the immutable and unique identifier for a Map or Reduce Task.

Uses of WritableComparable in org.apache.hadoop.mapreduce.lib.aggregate

Classes in org.apache.hadoop.mapreduce.lib.aggregate with type parameters of type WritableComparable

Modifier and Type	Class and Description
class	ValueAggregatorCombiner<K1 extends WritableComparable<?>,V1 extends Writable> This class implements the generic combiner of Aggregate.
class	ValueAggregatorJobBase<K1 extends WritableComparable<?>,V1 extends Writable> This abstract class implements some common functionalities of the the generic mapper, reducer and combiner classes of Aggregate.
class	ValueAggregatorMapper<K1 extends WritableComparable<?>,V1 extends Writable> This class implements the generic mapper of Aggregate.
class	ValueAggregatorReducer<K1 extends WritableComparable<?>,V1 extends Writable> This class implements the generic reducer of Aggregate.

Uses of WritableComparable in org.apache.hadoop.mapreduce.lib.join

Classes in org.apache.hadoop.mapreduce.lib.join with type parameters of type WritableComparable

Modifier and Type	Class and Description
class	ComposableInputFormat<K extends WritableComparable<?>,V extends Writable> Refinement of InputFormat requiring implementors to provide ComposableRecordReader instead of RecordReader.
class	ComposableRecordReader<K extends WritableComparable<?>,V extends Writable> Additional operations required of a RecordReader to participate in a join.
class	CompositeInputFormat<K extends WritableComparable> An InputFormat capable of performing joins over a set of data sources sorted and partitioned the same way.
class	CompositeRecordReader<K extends WritableComparable<?>,V extends Writable,X extends Writable> A RecordReader that can effect joins of RecordReaders sharing a common key type and partitioning.
class	InnerJoinRecordReader<K extends WritableComparable<?>> Full inner join.
class	JoinRecordReader<K extends WritableComparable<?>> Base class for Composite joins returning Tuples of arbitrary Writables.
class	MultiFilterRecordReader<K extends WritableComparable<?>,V extends Writable> Base class for Composite join returning values derived from multiple sources, but generally not tuples.
class	OuterJoinRecordReader<K extends WritableComparable<?>> Full outer join.
class	OverrideRecordReader<K extends WritableComparable<?>,V extends Writable> Prefer the "rightmost" data source for this key.
class	WrappedRecordReader<K extends WritableComparable<?>,U extends Writable> Proxy class for a RecordReader participating in the join framework.

Fields in org.apache.hadoop.mapreduce.lib.join declared as WritableComparable

Modifier and Type	Field and Description
protected K	CompositeRecordReader.key

Fields in org.apache.hadoop.mapreduce.lib.join with type parameters of type WritableComparable

Modifier and Type	Field and Description
protected Class<? extends WritableComparable>	CompositeRecordReader.keyclass

Uses of WritableComparable in org.apache.hadoop.mapreduce.lib.output

Methods in org.apache.hadoop.mapreduce.lib.output with type parameters of type WritableComparable

Modifier and Type	Method and Description
static <K extends WritableComparable<?>,V extends Writable> Writable	MapFileOutputFormat.getEntry(org.apache.hadoop.io.MapFile.Reader[] readers, Partitioner<K,V> partitioner, K key, V value) Get an entry from output generated by this class.

Methods in org.apache.hadoop.mapreduce.lib.output that return types with arguments of type WritableComparable

Modifier and Type	Method and Description
RecordWriter<WritableComparable<?>,Writable>	MapFileOutputFormat.getRecordWriter(TaskAttemptContext context)
static Class<? extends WritableComparable>	SequenceFileAsBinaryOutputFormat.getSequenceFileOutputKeyClass(JobContext job) Get the key class for the SequenceFile

Uses of WritableComparable in org.apache.hadoop.record

Classes in org.apache.hadoop.record that implement WritableComparable

Modifier and Type	Class and Description
class	Record Deprecated. Replaced by Avro.

Constructor parameters in org.apache.hadoop.record with type arguments of type WritableComparable

Constructor and Description
RecordComparator(Class<? extends WritableComparable> recordClass) Deprecated. Construct a raw Record comparison implementation.