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

Packages that use WritableComparable

org.apache.hadoop.contrib.index.mapred
org.apache.hadoop.dfs	A distributed implementation of FileSystem.
org.apache.hadoop.examples	Hadoop example code.
org.apache.hadoop.examples.dancing	This package is a distributed implementation of Knuth's dancing links algorithm that can run under Hadoop.
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	A software framework for easily writing applications which process vast amounts of data (multi-terabyte data-sets) parallelly on large clusters (thousands of nodes) built of commodity hardware in a reliable, fault-tolerant manner.
org.apache.hadoop.mapred.join	Given a set of sorted datasets keyed with the same class and yielding equal partitions, it is possible to effect a join of those datasets prior to the map.
org.apache.hadoop.mapred.lib.aggregate	Classes for performing various counting and aggregations.
org.apache.hadoop.record	Hadoop record I/O contains classes and a record description language translator for simplifying serialization and deserialization of records in a language-neutral manner.
org.apache.hadoop.record.meta

Uses of WritableComparable in org.apache.hadoop.contrib.index.mapred

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

interface	ILocalAnalysis<K extends WritableComparable,V extends Writable> Application specific local analysis.
class	IndexUpdateMapper<K extends WritableComparable,V extends Writable> This class applies local analysis on a key-value pair and then convert the result docid-operation pair to a shard-and-intermediate form pair.

Classes in org.apache.hadoop.contrib.index.mapred that implement WritableComparable

class	DocumentID The class represents a document id, which is of type text.
class	Shard This class represents the metadata of a shard.

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

static Class<? extends WritableComparable>	IndexUpdateMapper.getMapOutputKeyClass() Get the map output key class.
static Class<? extends WritableComparable>	IndexUpdateReducer.getOutputKeyClass() Get the reduce output key class.

Uses of WritableComparable in org.apache.hadoop.dfs

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

class	DatanodeDescriptor DatanodeDescriptor tracks stats on a given DataNode, such as available storage capacity, last update time, etc., and maintains a set of blocks stored on the datanode.
class	DatanodeID DatanodeID is composed of the data node name (hostname:portNumber) and the data storage ID, which it currently represents.
class	DatanodeInfo DatanodeInfo represents the status of a DataNode.

Uses of WritableComparable in org.apache.hadoop.examples

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

static class

MultiFileWordCount.WordOffset This record keeps <filename,offset> pairs.

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

void	PiEstimator.PiReducer.reduce(LongWritable key, Iterator<LongWritable> values, OutputCollector<WritableComparable,Writable> output, Reporter reporter) Reduce method.

Uses of WritableComparable in org.apache.hadoop.examples.dancing

Methods in org.apache.hadoop.examples.dancing with parameters of type WritableComparable

void	DistributedPentomino.PentMap.map(WritableComparable key, Text value, OutputCollector<Text,Text> output, Reporter reporter) Break the prefix string into moves (a sequence of integer row ids that will be selected for each column in order).

Uses of WritableComparable in org.apache.hadoop.io

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

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	Text This class stores text using standard UTF8 encoding.
class	UTF8 Deprecated. replaced by Text
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

WritableComparable	SortedMapWritable.firstKey()
WritableComparable	SetFile.Reader.get(WritableComparable key) Read the matching key from a set into key.
WritableComparable	MapFile.Reader.getClosest(WritableComparable key, Writable val) Finds the record that is the closest match to the specified key.
WritableComparable	MapFile.Reader.getClosest(WritableComparable key, Writable val, boolean before) Finds the record that is the closest match to the specified key.
WritableComparable	SortedMapWritable.lastKey()
WritableComparable	MapFile.Reader.midKey() Get the key at approximately the middle of the file.
WritableComparable	WritableComparator.newKey() Construct a new WritableComparable instance.

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

Comparator<? super WritableComparable>	SortedMapWritable.comparator()
Set<Map.Entry<WritableComparable,Writable>>	SortedMapWritable.entrySet()
SortedMap<WritableComparable,Writable>	SortedMapWritable.headMap(WritableComparable toKey)
Set<WritableComparable>	SortedMapWritable.keySet()
SortedMap<WritableComparable,Writable>	SortedMapWritable.subMap(WritableComparable fromKey, WritableComparable toKey)
SortedMap<WritableComparable,Writable>	SortedMapWritable.tailMap(WritableComparable fromKey)

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

void	SetFile.Writer.append(WritableComparable key) Append a key to a set.
void	MapFile.Writer.append(WritableComparable key, Writable val) Append a key/value pair to the map.
int	WritableComparator.compare(WritableComparable a, WritableComparable b) Compare two WritableComparables.
int	WritableComparator.compare(WritableComparable a, WritableComparable b) Compare two WritableComparables.
int	LongWritable.DecreasingComparator.compare(WritableComparable a, WritableComparable b)
int	LongWritable.DecreasingComparator.compare(WritableComparable a, WritableComparable b)
void	MapFile.Reader.finalKey(WritableComparable key) Reads the final key from the file.
WritableComparable	SetFile.Reader.get(WritableComparable key) Read the matching key from a set into key.
Writable	MapFile.Reader.get(WritableComparable key, Writable val) Return the value for the named key, or null if none exists.
WritableComparable	MapFile.Reader.getClosest(WritableComparable key, Writable val) Finds the record that is the closest match to the specified key.
WritableComparable	MapFile.Reader.getClosest(WritableComparable key, Writable val, boolean before) Finds the record that is the closest match to the specified key.
SortedMap<WritableComparable,Writable>	SortedMapWritable.headMap(WritableComparable toKey)
boolean	SetFile.Reader.next(WritableComparable key) Read the next key in a set into key.
boolean	MapFile.Reader.next(WritableComparable key, Writable val) Read the next key/value pair in the map into key and val.
Writable	SortedMapWritable.put(WritableComparable key, Writable value)
boolean	SetFile.Reader.seek(WritableComparable key)
boolean	MapFile.Reader.seek(WritableComparable key) Positions the reader at the named key, or if none such exists, at the first entry after the named key.
SortedMap<WritableComparable,Writable>	SortedMapWritable.subMap(WritableComparable fromKey, WritableComparable toKey)
SortedMap<WritableComparable,Writable>	SortedMapWritable.subMap(WritableComparable fromKey, WritableComparable toKey)
SortedMap<WritableComparable,Writable>	SortedMapWritable.tailMap(WritableComparable fromKey)

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

void	SortedMapWritable.putAll(Map<? extends WritableComparable,? extends Writable> t)

Uses of WritableComparable in org.apache.hadoop.mapred

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

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.

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

static <K extends WritableComparable,V extends Writable> Writable

MapFileOutputFormat.getEntry(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

RecordWriter<WritableComparable,Writable>

MapFileOutputFormat.getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress)

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

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

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

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.record

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

class

Record Abstract class that is extended by generated classes.

Uses of WritableComparable in org.apache.hadoop.record.meta

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

class

RecordTypeInfo A record's Type Information object which can read/write itself.