## Uses of Package
org.apache.hadoop.io

Packages that use org.apache.hadoop.io
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.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
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.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

Classes in org.apache.hadoop.io used by org.apache.hadoop.conf
Writable A serializable object which implements a simple, efficient, serialization protocol, based on `DataInput` and `DataOutput`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.contrib.index.example
Closeable Deprecated. 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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.contrib.index.mapred
Closeable Deprecated. 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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.contrib.utils.join
Closeable Deprecated. 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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.examples
BooleanWritable A WritableComparable for booleans.
Closeable Deprecated. 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 `WritableComparable`s.

Classes in org.apache.hadoop.io used by org.apache.hadoop.examples.dancing
Closeable Deprecated. use java.io.Closeable
Text This class stores text using standard UTF8 encoding.
WritableComparable A `Writable` which is also `Comparable`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.examples.terasort
Closeable Deprecated. use java.io.Closeable
LongWritable A WritableComparable for longs.
NullWritable Singleton Writable with no data.
Text This class stores text using standard UTF8 encoding.

Classes in org.apache.hadoop.io used by org.apache.hadoop.fs
MD5Hash A Writable for MD5 hash values.
Writable A serializable object which implements a simple, efficient, serialization protocol, based on `DataInput` and `DataOutput`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.fs.permission
Writable A serializable object which implements a simple, efficient, serialization protocol, based on `DataInput` and `DataOutput`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.io
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 Deprecated. 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 `WritableComparable`s.
WritableFactory A factory for a class of Writable.

Classes in org.apache.hadoop.io used by org.apache.hadoop.io.file.tfile
BytesWritable A byte sequence that is usable as a key or value.

Classes in org.apache.hadoop.io used by org.apache.hadoop.io.serializer
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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.ipc
Writable A serializable object which implements a simple, efficient, serialization protocol, based on `DataInput` and `DataOutput`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapred
BytesWritable A byte sequence that is usable as a key or value.
Closeable Deprecated. 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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapred.join
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 `WritableComparable`s.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapred.lib
Closeable Deprecated. 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 `WritableComparable`s.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapred.lib.aggregate
Closeable Deprecated. 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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapred.lib.db
LongWritable A WritableComparable for longs.
Writable A serializable object which implements a simple, efficient, serialization protocol, based on `DataInput` and `DataOutput`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapreduce
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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapreduce.lib.db
LongWritable A WritableComparable for longs.
Writable A serializable object which implements a simple, efficient, serialization protocol, based on `DataInput` and `DataOutput`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapreduce.lib.fieldsel
Text This class stores text using standard UTF8 encoding.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapreduce.lib.map
Text This class stores text using standard UTF8 encoding.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapreduce.lib.output
SequenceFile.Writer Write key/value pairs to a sequence-format file.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapreduce.lib.partition
BinaryComparable Interface supported by `WritableComparable` types supporting ordering/permutation by a representative set of bytes.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapreduce.lib.reduce
IntWritable A WritableComparable for ints.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapreduce.security
Text This class stores text using standard UTF8 encoding.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapreduce.security.token
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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapreduce.security.token.delegation
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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.mapreduce.split
Writable A serializable object which implements a simple, efficient, serialization protocol, based on `DataInput` and `DataOutput`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.record
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 `WritableComparable`s.

Classes in org.apache.hadoop.io used by org.apache.hadoop.record.meta
Writable A serializable object which implements a simple, efficient, serialization protocol, based on `DataInput` and `DataOutput`.
WritableComparable A `Writable` which is also `Comparable`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.security
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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.security.authorize
Writable A serializable object which implements a simple, efficient, serialization protocol, based on `DataInput` and `DataOutput`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.security.token
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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.security.token.delegation
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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.streaming
Closeable Deprecated. use java.io.Closeable
Text This class stores text using standard UTF8 encoding.

Classes in org.apache.hadoop.io used by org.apache.hadoop.streaming.io
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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.typedbytes
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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.util
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`.

Classes in org.apache.hadoop.io used by org.apache.hadoop.util.bloom
Writable A serializable object which implements a simple, efficient, serialization protocol, based on `DataInput` and `DataOutput`.
WritableComparable A `Writable` which is also `Comparable`.

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