Package org.apache.hadoop.hbase.regionserver.wal

Class Compressor

java.lang.Object

org.apache.hadoop.hbase.regionserver.wal.Compressor

@Private
public class Compressor
extends Object

A set of static functions for running our custom WAL compression/decompression. Also contains a command line tool to compress and uncompress WALs.

Constructor Summary

Constructors

Constructor	Description
Compressor()

Method Summary

Modifier and Type	Method	Description
static void	main(String[] args)	Command line tool to compress and uncompress WALs.
private static void	printHelp()
(package private) static byte[]	readCompressed(DataInput in, Dictionary dict)	Deprecated.
(package private) static short	toShort(byte hi, byte lo)
private static void	transformFile(org.apache.hadoop.fs.Path input, org.apache.hadoop.fs.Path output)
(package private) static int	uncompressIntoArray(byte[] to, int offset, DataInput in, Dictionary dict)	Deprecated.
(package private) static void	writeCompressed(byte[] data, int offset, int length, DataOutput out, Dictionary dict)	Deprecated.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Compressor

public Compressor()

Method Details

main

public static void main(String[] args)
                 throws IOException

Command line tool to compress and uncompress WALs.

Throws:

IOException

printHelp

private static void printHelp()

transformFile

private static void transformFile(org.apache.hadoop.fs.Path input,
 org.apache.hadoop.fs.Path output)
                           throws IOException

Throws:

IOException

readCompressed

@Deprecated
static byte[] readCompressed(DataInput in,
 Dictionary dict)
                      throws IOException

Deprecated.

Reads the next compressed entry and returns it as a byte array

Parameters:

in - the DataInput to read from

dict - the dictionary we use for our read.

Returns:

the uncompressed array.

Throws:

IOException

uncompressIntoArray

@Deprecated
static int uncompressIntoArray(byte[] to,
 int offset,
 DataInput in,
 Dictionary dict)
                        throws IOException

Deprecated.

Reads a compressed entry into an array. The output into the array ends up length-prefixed.

Parameters:

to - the array to write into

offset - array offset to start writing to

in - the DataInput to read from

dict - the dictionary to use for compression

Returns:

the length of the uncompressed data

Throws:

IOException

writeCompressed

@Deprecated
static void writeCompressed(byte[] data,
 int offset,
 int length,
 DataOutput out,
 Dictionary dict)
                     throws IOException

Deprecated.

Compresses and writes an array to a DataOutput

Parameters:

data - the array to write.

out - the DataOutput to write into

dict - the dictionary to use for compression

Throws:

IOException

toShort

static short toShort(byte hi,
 byte lo)