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Package org.apache.hadoop.io

Added Classes
BloomMapFile This class extends MapFile and provides very much the same functionality.
BloomMapFile.Reader  
BloomMapFile.Writer  
SecureIOUtils This class provides secure APIs for opening and creating files on the local disk.
SecureIOUtils.AlreadyExistsException Signals that an attempt to create a file at a given pathname has failed because another file already existed at that path.
 

Changed Classes and Interfaces
ArrayFile.Writer Write a new array file.
ArrayWritable A Writable for arrays containing instances of a class.
BinaryComparable Interface supported by org.apache.hadoop.io.WritableComparable types supporting ordering/permutation by a representative set of bytes.
BytesWritable A byte sequence that is usable as a key or value.
DefaultStringifier DefaultStringifier is the default implementation of the Stringifier interface which stringifies the objects using base64 encoding of the serialized version of the objects.
IOUtils An utility class for I/O related functionality.
MD5Hash A Writable for MD5 hash values.
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.
MultipleIOException Encapsulate a list of IOException into an IOException
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.Metadata The class encapsulating with the metadata of a file.
SequenceFile.Reader Reads 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.Writer Write a new set 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.
WritableComparable A Writable which is also Comparable
WritableComparator A Comparator for
WritableFactories Factories for non-public writables.
WritableName Utility to permit renaming of Writable implementation classes without invalidiating files that contain their class name.
WritableUtils