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

Packages that use WritableComparable

org.apache.hadoop.contrib.utils.join
org.apache.hadoop.dfs	A distributed implementation of FileSystem.
org.apache.hadoop.examples	Hadoop example code.
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 system for scalable, fault-tolerant, distributed computation over large data collections.
org.apache.hadoop.mapred.lib	Library of generally useful mappers, reducers, and partitioners.
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.streaming
org.apache.hadoop.tools
org.apache.hadoop.util	Common utilities.

Uses of WritableComparable in org.apache.hadoop.contrib.utils.join

Methods in org.apache.hadoop.contrib.utils.join with parameters of type WritableComparable

protected void	DataJoinReducerBase.collect(WritableComparable key, TaggedMapOutput aRecord, OutputCollector output, Reporter reporter) The subclass can overwrite this method to perform additional filtering and/or other processing logic before a value is collected.
void	DataJoinMapperBase.map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter)
void	DataJoinReducerBase.map(WritableComparable arg0, Writable arg1, OutputCollector arg2, Reporter arg3)
void	DataJoinMapperBase.reduce(WritableComparable arg0, Iterator arg1, OutputCollector arg2, Reporter arg3)
void	DataJoinReducerBase.reduce(WritableComparable key, Iterator values, OutputCollector output, Reporter reporter)

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

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

void	PiEstimator.PiMapper.map(WritableComparable key, Writable val, OutputCollector out, Reporter reporter) Map method.
void	WordCount.MapClass.map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter)
void	PiEstimator.PiReducer.reduce(WritableComparable key, Iterator values, OutputCollector output, Reporter reporter) Reduce method.
void	WordCount.Reduce.reduce(WritableComparable key, Iterator values, OutputCollector output, Reporter reporter)

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	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	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	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.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 with parameters of type WritableComparable

void	SetFile.Writer.append(WritableComparable key) Deprecated. Append a key to a set.
void	MapFile.Writer.append(WritableComparable key, Writable val) Append a key/value pair to the map.
int	LongWritable.DecreasingComparator.compare(WritableComparable a, WritableComparable b)
int	WritableComparator.compare(WritableComparable a, WritableComparable b) Compare two WritableComparables.
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.
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.
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.
boolean	SetFile.Reader.seek(WritableComparable key)

Uses of WritableComparable in org.apache.hadoop.mapred

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

WritableComparable	SequenceFileRecordReader.createKey()
WritableComparable	SequenceFileAsTextRecordReader.createKey()
WritableComparable	LineRecordReader.createKey()
WritableComparable	RecordReader.createKey() Create an object of the appropriate type to be used as a key.

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

Class<? extends WritableComparable>	JobConf.getMapOutputKeyClass() Get the key class for the map output data.
Class<? extends WritableComparable>	JobConf.getOutputKeyClass()

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

void	OutputCollector.collect(WritableComparable key, Writable value) Adds a key/value pair to the output.
static Writable	MapFileOutputFormat.getEntry(MapFile.Reader[] readers, Partitioner partitioner, WritableComparable key, Writable value) Get an entry from output generated by this class.
int	Partitioner.getPartition(WritableComparable key, Writable value, int numPartitions) Returns the paritition number for a given entry given the total number of partitions.
void	Mapper.map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter) Maps a single input key/value pair into intermediate key/value pairs.
void	Reducer.reduce(WritableComparable key, Iterator values, OutputCollector output, Reporter reporter) Combines values for a given key.
void	TextOutputFormat.LineRecordWriter.write(WritableComparable key, Writable value)
void	RecordWriter.write(WritableComparable key, Writable value) Writes a key/value pair.

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

void	JobConf.setMapOutputKeyClass(Class<? extends WritableComparable> theClass) Set the key class for the map output data.
void	JobConf.setOutputKeyClass(Class<? extends WritableComparable> theClass)

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

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

int	HashPartitioner.getPartition(WritableComparable key, Writable value, int numReduceTasks) Use Object.hashCode() to partition.
int	KeyFieldBasedPartitioner.getPartition(WritableComparable key, Writable value, int numReduceTasks) Use Object.hashCode() to partition.
void	FieldSelectionMapReduce.map(WritableComparable key, Writable val, OutputCollector output, Reporter reporter) The identify function.
void	IdentityMapper.map(WritableComparable key, Writable val, OutputCollector output, Reporter reporter) The identify function.
void	RegexMapper.map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter)
void	InverseMapper.map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter) The inverse function.
void	TokenCountMapper.map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter)
void	LongSumReducer.reduce(WritableComparable key, Iterator values, OutputCollector output, Reporter reporter)
void	FieldSelectionMapReduce.reduce(WritableComparable key, Iterator values, OutputCollector output, Reporter reporter)
void	IdentityReducer.reduce(WritableComparable key, Iterator values, OutputCollector output, Reporter reporter) Writes all keys and values directly to output.

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

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

void	ValueAggregatorMapper.map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter) the map function.
void	ValueAggregatorReducer.map(WritableComparable arg0, Writable arg1, OutputCollector arg2, Reporter arg3) Do nothing.
void	ValueAggregatorCombiner.map(WritableComparable arg0, Writable arg1, OutputCollector arg2, Reporter arg3) Do nothing.
void	ValueAggregatorMapper.reduce(WritableComparable arg0, Iterator arg1, OutputCollector arg2, Reporter arg3) Do nothing.
void	ValueAggregatorReducer.reduce(WritableComparable key, Iterator values, OutputCollector output, Reporter reporter)
void	ValueAggregatorCombiner.reduce(WritableComparable key, Iterator values, OutputCollector output, Reporter reporter) Combines values for a given key.

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.streaming

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

WritableComparable

StreamBaseRecordReader.createKey()

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

void	PipeMapper.map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter)
void	PipeReducer.reduce(WritableComparable key, Iterator values, OutputCollector output, Reporter reporter)

Uses of WritableComparable in org.apache.hadoop.tools

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

void	Logalyzer.LogRegexMapper.map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter)

Uses of WritableComparable in org.apache.hadoop.util

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

void	CopyFiles.FSCopyFilesMapper.map(WritableComparable key, Writable value, OutputCollector out, Reporter reporter) Map method.
void	CopyFiles.HTTPCopyFilesMapper.map(WritableComparable key, Writable val, OutputCollector out, Reporter reporter)