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Package org.apache.hadoop.io

Added Classes
ByteWritable A WritableComparable for a single byte.
ByteWritable.Comparator A Comparator optimized for ByteWritable.
DoubleWritable Writable for Double values.
DoubleWritable.Comparator A Comparator optimized for DoubleWritable.
NullWritable.Comparator A Comparator "optimized" for NullWritable.
 

Changed Classes and Interfaces
Closeable use java.io.Closeable
DataInputBuffer A reusable DataInput implementation that reads from an in-memory buffer.
DataOutputBuffer A reusable DataOutput implementation that writes to an in-memory buffer.
IOUtils An utility class for I/O related functionality.
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.
WritableComparable A Writable which is also Comparable.
WritableComparator A Comparator for WritableComparables.