A prefix hash tree (PHT) is a distributed data structure that enables more sophisticated queries over a distributed hash table (DHT). The prefix hash tree uses the lookup interface of a DHT to construct a trie-based data structure that is both efficient (updates are doubly logarithmic in the size of the domain being indexed), and resilient (the failure of any given node in a Prefix Hash Tree does not affect the availability of data stored at other nodes).

External links

• http://berkeley.intel-research.net/sylvia/pht.pdf - Prefix Hash Tree: An Indexing Data Structure over Distributed Hash Tables
• http://pier.cs.berkeley.edu - PHT's were developed as part of work on the PIER project.

See also

• Prefix tree
• P-Grid