Moreno Puello, Oliver A.

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    Peer to peer catalog manager for nettraveler middleware system
    (2007) Moreno Puello, Oliver A.; Rodríguez Martínez, Manuel; College of Engineering; Vélez Rivera, Bienvenido; Rivera Vega, Pedro I.; Department of Electrical and Computer Engineering; Uwakweh, Oswald
    Distributed and mobile database systems hold the promise of interconnecting mobile de- vices, workstations, and enterprise servers to share data and computational resources. In these environments, query optimizers will be as good as the metadata they use in the optimization pro- cess. These metadata are kept in the catalog (data dictionary) of the system. Several approaches currently in use for metadata management assume that the catalog is either: a) centralized, b) fully replicated system-wide, or c) distributed among various well-known sites. However, the dynamic nature of mobile and wide-area networks results in constant changes to the metadata, as well as changes in the sites holding such metadata. Hence, it is of paramount importance to have a catalog system that dynamically adapts to these changes. This work presents a decentralized framework for metadata management that copes with this situation. Our approach is based on a Peer-to-Peer (P2P) catalog management organization, which uses consistent hashing as the mechanism to locate metadata objects throughout the system. Each metadata object is associated with a well-known key. Our framework makes the system more scalable since there is no central metadata repository, and metadata can be found through an efficient search mechanism. It also provides efficient mechanisms to handle the arrival and departure of hosts and the metadata associated with these hosts.