| 程序包 | 说明 |
|---|---|
| org.apache.hadoop.conf |
Configuration of system parameters.
|
| org.apache.hadoop.contrib.index.example | |
| org.apache.hadoop.contrib.index.mapred | |
| org.apache.hadoop.contrib.utils.join | |
| 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.examples.terasort |
This package consists of 3 map/reduce applications for Hadoop to
compete in the annual terabyte sort
competition.
|
| org.apache.hadoop.fs |
An abstract file system API.
|
| org.apache.hadoop.fs.permission | |
| org.apache.hadoop.hdfs |
A distributed implementation of
FileSystem. |
| org.apache.hadoop.hdfs.protocol | |
| org.apache.hadoop.hdfs.security.token.block | |
| org.apache.hadoop.hdfs.server.common | |
| org.apache.hadoop.hdfs.server.namenode | |
| org.apache.hadoop.hdfs.server.protocol | |
| org.apache.hadoop.hdfs.web | |
| 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.io.file.tfile | |
| org.apache.hadoop.io.serializer |
This package provides a mechanism for using different serialization frameworks
in Hadoop.
|
| org.apache.hadoop.ipc |
Tools to help define network clients and servers.
|
| 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 |
Library of generally useful mappers, reducers, and partitioners.
|
| org.apache.hadoop.mapred.lib.aggregate |
Classes for performing various counting and aggregations.
|
| org.apache.hadoop.mapred.lib.db |
org.apache.hadoop.mapred.lib.db Package
This package contains a library to read records from a database as an
input to a mapreduce job, and write the output records to the database.
|
| org.apache.hadoop.mapreduce | |
| org.apache.hadoop.mapreduce.lib.db | |
| org.apache.hadoop.mapreduce.lib.fieldsel | |
| org.apache.hadoop.mapreduce.lib.map | |
| org.apache.hadoop.mapreduce.lib.output | |
| org.apache.hadoop.mapreduce.lib.partition | |
| org.apache.hadoop.mapreduce.lib.reduce | |
| org.apache.hadoop.mapreduce.security | |
| org.apache.hadoop.mapreduce.security.token | |
| org.apache.hadoop.mapreduce.security.token.delegation | |
| org.apache.hadoop.mapreduce.split | |
| 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 | |
| org.apache.hadoop.security | |
| org.apache.hadoop.security.authorize | |
| org.apache.hadoop.security.token | |
| org.apache.hadoop.security.token.delegation | |
| org.apache.hadoop.streaming |
Hadoop Streaming is a utility which allows users to create and run
Map-Reduce jobs with any executables (e.g.
|
| org.apache.hadoop.streaming.io | |
| org.apache.hadoop.tools | |
| org.apache.hadoop.tools.distcp2.mapred | |
| org.apache.hadoop.tools.rumen |
Rumen is a data extraction and analysis tool built for
Apache Hadoop.
|
| org.apache.hadoop.typedbytes |
Typed bytes are sequences of bytes in which the first byte is a type code.
|
| org.apache.hadoop.util |
Common utilities.
|
| org.apache.hadoop.util.bloom |
| 类和说明 |
|---|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Closeable
已过时。
use java.io.Closeable
|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Closeable
已过时。
use java.io.Closeable
|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| 类和说明 |
|---|
| Closeable
已过时。
use java.io.Closeable
|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| BooleanWritable
A WritableComparable for booleans.
|
| Closeable
已过时。
use java.io.Closeable
|
| IntWritable
A WritableComparable for ints.
|
| LongWritable
A WritableComparable for longs.
|
| NullWritable
Singleton Writable with no data.
|
| RawComparator
A
Comparator that operates directly on byte representations of
objects. |
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| WritableComparator
A Comparator for
WritableComparables. |
| 类和说明 |
|---|
| Closeable
已过时。
use java.io.Closeable
|
| Text
This class stores text using standard UTF8 encoding.
|
| WritableComparable
A
Writable which is also Comparable. |
| 类和说明 |
|---|
| Closeable
已过时。
use java.io.Closeable
|
| LongWritable
A WritableComparable for longs.
|
| NullWritable
Singleton Writable with no data.
|
| Text
This class stores text using standard UTF8 encoding.
|
| 类和说明 |
|---|
| MD5Hash
A Writable for MD5 hash values.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Closeable
已过时。
use java.io.Closeable
|
| Text
This class stores text using standard UTF8 encoding.
|
| 类和说明 |
|---|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| 类和说明 |
|---|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| 类和说明 |
|---|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| 类和说明 |
|---|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| 类和说明 |
|---|
| Text
This class stores text using standard UTF8 encoding.
|
| 类和说明 |
|---|
| AbstractMapWritable
Abstract base class for MapWritable and SortedMapWritable
Unlike org.apache.nutch.crawl.MapWritable, this class allows creation of
MapWritable<Writable, MapWritable> so the CLASS_TO_ID and ID_TO_CLASS
maps travel with the class instead of being static.
|
| BinaryComparable
Interface supported by
WritableComparable
types supporting ordering/permutation by a representative set of bytes. |
| BytesWritable
A byte sequence that is usable as a key or value.
|
| DataOutputBuffer
A reusable
DataOutput implementation that writes to an in-memory
buffer. |
| LongWritable.Comparator
A Comparator optimized for LongWritable.
|
| MapFile
A file-based map from keys to values.
|
| MapFile.Reader
Provide access to an existing map.
|
| MapFile.Writer
Writes a new map.
|
| MapWritable
A Writable Map.
|
| MD5Hash
A Writable for MD5 hash values.
|
| NullWritable
Singleton Writable with no data.
|
| ObjectWritable
A polymorphic Writable that writes an instance with it's class name.
|
| OutputBuffer
A reusable
OutputStream implementation that writes to an in-memory
buffer. |
| RawComparator
A
Comparator that operates directly on byte representations of
objects. |
| ReadaheadPool
Manages a pool of threads which can issue readahead requests on file descriptors.
|
| ReadaheadPool.ReadaheadRequest
An outstanding readahead request that has been submitted to
the pool.
|
| SequenceFile.CompressionType
The compression type used to compress key/value pairs in the
SequenceFile. |
| SequenceFile.Metadata
The class encapsulating with the metadata of a file.
|
| SequenceFile.Reader
Reads key/value pairs from a sequence-format file.
|
| SequenceFile.Sorter.RawKeyValueIterator
The interface to iterate over raw keys/values of SequenceFiles.
|
| SequenceFile.Sorter.SegmentDescriptor
This class defines a merge segment.
|
| SequenceFile.ValueBytes
The interface to 'raw' values of SequenceFiles.
|
| SequenceFile.Writer
Write key/value pairs to a sequence-format file.
|
| SortedMapWritable
A Writable SortedMap.
|
| Stringifier
Stringifier interface offers two methods to convert an object
to a string representation and restore the object given its
string representation.
|
| Text
This class stores text using standard UTF8 encoding.
|
| UTF8
已过时。
replaced by Text
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| WritableComparator
A Comparator for
WritableComparables. |
| WritableFactory
A factory for a class of Writable.
|
| 类和说明 |
|---|
| BytesWritable
A byte sequence that is usable as a key or value.
|
| 类和说明 |
|---|
| RawComparator
A
Comparator that operates directly on byte representations of
objects. |
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| BytesWritable
A byte sequence that is usable as a key or value.
|
| Closeable
已过时。
use java.io.Closeable
|
| DataInputBuffer
A reusable
DataInput implementation that reads from an in-memory
buffer. |
| LongWritable
A WritableComparable for longs.
|
| MapFile.Reader
Provide access to an existing map.
|
| RawComparator
A
Comparator that operates directly on byte representations of
objects. |
| SequenceFile.CompressionType
The compression type used to compress key/value pairs in the
SequenceFile. |
| SequenceFile.Reader
Reads key/value pairs from a sequence-format file.
|
| SequenceFile.ValueBytes
The interface to 'raw' values of SequenceFiles.
|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| 类和说明 |
|---|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| WritableComparator
A Comparator for
WritableComparables. |
| 类和说明 |
|---|
| Closeable
已过时。
use java.io.Closeable
|
| LongWritable
A WritableComparable for longs.
|
| RawComparator
A
Comparator that operates directly on byte representations of
objects. |
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| WritableComparator
A Comparator for
WritableComparables. |
| 类和说明 |
|---|
| Closeable
已过时。
use java.io.Closeable
|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| 类和说明 |
|---|
| LongWritable
A WritableComparable for longs.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| RawComparator
A
Comparator that operates directly on byte representations of
objects. |
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| 类和说明 |
|---|
| LongWritable
A WritableComparable for longs.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Text
This class stores text using standard UTF8 encoding.
|
| 类和说明 |
|---|
| Text
This class stores text using standard UTF8 encoding.
|
| 类和说明 |
|---|
| SequenceFile.Writer
Write key/value pairs to a sequence-format file.
|
| 类和说明 |
|---|
| BinaryComparable
Interface supported by
WritableComparable
types supporting ordering/permutation by a representative set of bytes. |
| 类和说明 |
|---|
| IntWritable
A WritableComparable for ints.
|
| 类和说明 |
|---|
| Text
This class stores text using standard UTF8 encoding.
|
| 类和说明 |
|---|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| RawComparator
A
Comparator that operates directly on byte representations of
objects. |
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| WritableComparator
A Comparator for
WritableComparables. |
| 类和说明 |
|---|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| 类和说明 |
|---|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Closeable
已过时。
use java.io.Closeable
|
| Text
This class stores text using standard UTF8 encoding.
|
| 类和说明 |
|---|
| BytesWritable
A byte sequence that is usable as a key or value.
|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Closeable
已过时。
use java.io.Closeable
|
| LongWritable
A WritableComparable for longs.
|
| RawComparator
A
Comparator that operates directly on byte representations of
objects. |
| Text
This class stores text using standard UTF8 encoding.
|
| Text.Comparator
A WritableComparator optimized for Text keys.
|
| WritableComparable
A
Writable which is also Comparable. |
| WritableComparator
A Comparator for
WritableComparables. |
| 类和说明 |
|---|
| Text
This class stores text using standard UTF8 encoding.
|
| 类和说明 |
|---|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| ArrayWritable
A Writable for arrays containing instances of a class.
|
| BinaryComparable
Interface supported by
WritableComparable
types supporting ordering/permutation by a representative set of bytes. |
| BooleanWritable
A WritableComparable for booleans.
|
| BytesWritable
A byte sequence that is usable as a key or value.
|
| ByteWritable
A WritableComparable for a single byte.
|
| DoubleWritable
Writable for Double values.
|
| FloatWritable
A WritableComparable for floats.
|
| IntWritable
A WritableComparable for ints.
|
| LongWritable
A WritableComparable for longs.
|
| MapWritable
A Writable Map.
|
| SortedMapWritable
A Writable SortedMap.
|
| Text
This class stores text using standard UTF8 encoding.
|
| VIntWritable
A WritableComparable for integer values stored in variable-length format.
|
| VLongWritable
A WritableComparable for longs in a variable-length format.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
| 类和说明 |
|---|
| IntWritable
A WritableComparable for ints.
|
| Text
This class stores text using standard UTF8 encoding.
|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| 类和说明 |
|---|
| Writable
A serializable object which implements a simple, efficient, serialization
protocol, based on
DataInput and DataOutput. |
| WritableComparable
A
Writable which is also Comparable. |
Copyright © 2009 The Apache Software Foundation