An Efficient approach of Integrated file Replication and Consistency Maintenance In peer-to-peer systems
R. Sakunthala, T. Pandikumar, G. S. Aiswarya · 2014
File replication is an effective method to deal with the problem of overload condition due to flash crowds or hot files. It distributes load over replica nodes and improves file query efficiency. File consistency maintenance to maintain the consistency between a file and its replicas is indispensable to file replication. In most current file replication methods, file owners rigidly specify replica nodes and the replica nodes passively accept replicas. The methods were designed without considering the efficiency of subsequent file consistency maintenance. The number of replicas has a significant impact on the overhead of file consistency maintenance. Large number of replicas needs more updates hence high consistency maintenance overhead and vice versa. So the methods lead to high overhead for unnecessary file replications and consistency maintenance. IRM integrates file replication and consistency maintenance in a harmonized and coordinated manner. IRM achieves high efficiency in file replication and consistency maintenance at a significantly lower cost. Each node actively decides to create or delete a replica and to poll for update based on file query and update rates in a totally decentralized and autonomous manner. IRM improves replica utilization, file query efficiency, and consistency fidelity. It avoids unnecessary file replications and updates by dynamically adapting to time varying