Package org.apache.hadoop.util

Class PureJavaCrc32

java.lang.Object

java.util.zip.CRC32

org.apache.hadoop.util.PureJavaCrc32

All Implemented Interfaces:

Checksum

@Public
@Stable
public class PureJavaCrc32
extends CRC32

The legacy PureJavaCrc32 implemented in HADOOP-6148 is much slower than JDK native implementation in modern JDKs, HADOOP-19839 rewrites it to delegate to JDK native CRC32.

See Also:

• CRC32

Constructor Summary

Constructors

Constructor	Description
PureJavaCrc32()

Method Summary

Modifier and Type	Method	Description
static int	mod(long x)	Compute x mod p, where p is the CRC32 polynomial.

Methods inherited from class java.util.zip.CRC32

getValue, reset, update, update, update

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.zip.Checksum

update

Constructor Details

PureJavaCrc32

public PureJavaCrc32()

Method Details

mod

public static int mod(long x)

Compute x mod p, where p is the CRC32 polynomial.

Parameters:

x - the input value

Returns:

x mod p