{'fraction_non_alphanumeric': 0.023255813953488372, 'fraction_numerical': 0.006001500375093774, 'mean_word_length': 5.175925925925926, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Systems : Data Management in Peer-to-Peer Systems Survey of Peer-to-Peer Systems

Peer-to-peer (P2P) networking has generated tremendous interest worldwide among Internet users as well as computer professionals. P2P systems like Kazaa and Napster rank amongst the most popular software applications ever. P2P systems have become popular Internet applications since the arrival of Napster and other P2P architectures used for music file sharing. Several businesses and Web sites have promoted P2P technology as the future of Internet networking. In recent years, peer-to-peer systems have emerged as an interesting architecture for implementing distributed file systems. In a P2P network, end users share resources which are able to exchange. Information is distributed among the member nodes instead of being concentrated at a single server. A successful P2P file-sharing network must have some desirable properties, such as ease of use, ability to expand over large numbers of peers, produce results despite node failures and find infrequent items. This survey of P2P systems presents different system architectures used for file-sharing and query routing protocols. We discuss more complex queries, such as range queries over one or more attributes and replication techniques. Finally, we refer to algorithms for updating replicas.