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See:
Description
Interface Summary | |
Writable | A simple, efficient, serialization protocol, based on DataInput and
DataOutput . |
WritableComparable | An interface which extends both Writable and Comparable . |
Class Summary | |
ArrayFile | A dense file-based mapping from integers to values. |
ArrayFile.Reader | Provide access to an existing array file. |
ArrayFile.Writer | Write a new array file. |
ArrayWritable | A Writable for arrays containing instances of a class. |
BooleanWritable | A WritableComparable for booleans. |
BooleanWritable.Comparator | A Comparator optimized for BooleanWritable. |
BytesWritable | A Writable for byte arrays. |
DataInputBuffer | A reusable DataInput implementation that reads from an in-memory
buffer. |
DataOutputBuffer | A reusable DataOutput implementation that writes to an in-memory
buffer. |
IntWritable | A WritableComparable for ints. |
IntWritable.Comparator | A Comparator optimized for IntWritable. |
LongWritable | A WritableComparable for longs. |
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. |
MD5Hash | A Writable for MD5 hash values. |
MD5Hash.Comparator | A WritableComparator optimized for MD5Hash keys. |
NullWritable | Singleton Writable with no data. |
SequenceFile | Support for flat files of binary key/value pairs. |
SequenceFile.Reader | Writes key/value pairs from a sequence-format file. |
SequenceFile.Sorter | Sorts key/value pairs in a sequence-format file. |
SequenceFile.Writer | Write key/value pairs to a sequence-format file. |
SetFile | A file-based set of keys. |
SetFile.Reader | Provide access to an existing set file. |
SetFile.Writer | Write a new set file. |
TwoDArrayWritable | A Writable for 2D arrays containing a matrix of instances of a class. |
UTF8 | A WritableComparable for strings that uses the UTF8 encoding. |
UTF8.Comparator | A WritableComparator optimized for UTF8 keys. |
VersionedWritable | A base class for Writables that provides version checking. |
WritableComparator | A Comparator for WritableComparable s. |
WritableName | Utility to permit renaming of Writable implementation classes without invalidiating files that contain their class name. |
WritableUtils |
Exception Summary | |
VersionMismatchException | Thrown by VersionedWritable.readFields(DataInput) when the
version of an object being read does not match the current implementation
version as returned by VersionedWritable.getVersion() . |
Generic i/o code for use when reading and writing data to the network, to databases, and to files.
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