See: Description
| Interface | Description | 
|---|---|
| ByteBufferPool | |
| Closeable | Deprecated use java.io.Closeable | 
| RawComparator<T> | 
 A  Comparatorthat operates directly on byte representations of
 objects. | 
| Stringifier<T> | Stringifier interface offers two methods to convert an object 
 to a string representation and restore the object given its 
 string representation. | 
| Writable | A serializable object which implements a simple, efficient, serialization 
 protocol, based on  DataInputandDataOutput. | 
| WritableComparable<T> | A  Writablewhich is alsoComparable. | 
| WritableFactory | A factory for a class of Writable. | 
| Class | Description | 
|---|---|
| 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. | 
| ArrayFile | A dense file-based mapping from integers to values. | 
| ArrayPrimitiveWritable | This is a wrapper class. | 
| ArrayWritable | A Writable for arrays containing instances of a class. | 
| BinaryComparable | Interface supported by  WritableComparabletypes supporting ordering/permutation by a representative set of bytes. | 
| BloomMapFile | This class extends  MapFileand provides very much the same
 functionality. | 
| BooleanWritable | A WritableComparable for booleans. | 
| BytesWritable | A byte sequence that is usable as a key or value. | 
| ByteWritable | A WritableComparable for a single byte. | 
| CompressedWritable | A base-class for Writables which store themselves compressed and lazily
 inflate on field access. | 
| DataOutputOutputStream | OutputStream implementation that wraps a DataOutput. | 
| DefaultStringifier<T> | DefaultStringifier is the default implementation of the  Stringifierinterface which stringifies the objects using base64 encoding of the
 serialized version of the objects. | 
| DoubleWritable | Writable for Double values. | 
| ElasticByteBufferPool | This is a simple ByteBufferPool which just creates ByteBuffers as needed. | 
| EnumSetWritable<E extends Enum<E>> | A Writable wrapper for EnumSet. | 
| FloatWritable | A WritableComparable for floats. | 
| GenericWritable | A wrapper for Writable instances. | 
| IntWritable | A WritableComparable for ints. | 
| IOUtils | An utility class for I/O related functionality. | 
| LongWritable | A WritableComparable for longs. | 
| MapFile | A file-based map from keys to values. | 
| 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. | 
| SequenceFile | SequenceFiles are flat files consisting of binary key/value 
 pairs. | 
| SetFile | A file-based set of keys. | 
| ShortWritable | A WritableComparable for shorts. | 
| SortedMapWritable<K extends WritableComparable<? super K>> | A Writable SortedMap. | 
| Text | This class stores text using standard UTF8 encoding. | 
| TwoDArrayWritable | A Writable for 2D arrays containing a matrix of instances of a class. | 
| VersionedWritable | A base class for Writables that provides version checking. | 
| VIntWritable | A WritableComparable for integer values stored in variable-length format. | 
| VLongWritable | A WritableComparable for longs in a variable-length format. | 
| WritableComparator | A Comparator for  WritableComparables. | 
| WritableFactories | Factories for non-public writables. | 
| WritableUtils | 
| Exception | Description | 
|---|---|
| MultipleIOException | Encapsulate a list of  IOExceptioninto anIOException | 
| VersionMismatchException | Thrown by  VersionedWritable.readFields(DataInput)when the
 version of an object being read does not match the current implementation
 version as returned byVersionedWritable.getVersion(). | 
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