org.apache.hadoop.fs

Interface PositionedReadable

All Known Implementing Classes:

FSDataInputStream, HdfsDataInputStream

@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface PositionedReadable

Stream that permits positional reading.

Method Summary

Methods

Modifier and Type	Method and Description
int	read(long position, byte[] buffer, int offset, int length) Read upto the specified number of bytes, from a given position within a file, and return the number of bytes read.
void	readFully(long position, byte[] buffer) Read number of bytes equal to the length of the buffer, from a given position within a file.
void	readFully(long position, byte[] buffer, int offset, int length) Read the specified number of bytes, from a given position within a file.

Method Detail

read

int read(long position,
       byte[] buffer,
       int offset,
       int length)
         throws IOException

Read upto the specified number of bytes, from a given position within a file, and return the number of bytes read. This does not change the current offset of a file, and is thread-safe.

Throws:

IOException

readFully

void readFully(long position,
             byte[] buffer,
             int offset,
             int length)
               throws IOException

Read the specified number of bytes, from a given position within a file. This does not change the current offset of a file, and is thread-safe.

Throws:

IOException

readFully

void readFully(long position,
             byte[] buffer)
               throws IOException

Read number of bytes equal to the length of the buffer, from a given position within a file. This does not change the current offset of a file, and is thread-safe.

Throws:

IOException