NAME

Digest::Pearson - Perl interface to Pearson hash

SYNOPSIS

  use Digest::Pearson qw(pearson);
  
  my $hash = pearson("abcdef012345");  # 0 <= $hash < 256

DESCRIPTION

Digest::Pearson is an implementation of Peter K. Pearson's hash algorithm presented in "Fast Hashing of Variable Length Text Strings" - ACM 1990. This hashing technique yields good distribution of hashed results for variable length input strings on the range 0-255, and thus, it is well suited for data load balancing.

The implementation is in C, so it is fast. If you prefer a pure Perl version and can tolerate slower speed, you might want to consider Digest::Pearson::PurePerl instead.

This module does not export anything by default. To use this hash function, do either of the following.

use Digest::Pearson qw(pearson);

Digest::Pearson::pearson($string)

ACKNOWLEDGEMENTS

The implementation is derived from RFC 3074 - DHC Load Balancing Algorithm.

SEE ALSO

Digest::FNV, Digest::DJB, Digest::Pearson::PurePerl.

BUGS

If you find any inaccurate or missing information, please send your comments to tnguyen@cpan.org. Your effort is certainly appreciated!