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In this paper, we present a hybrid message logging protocol consisting of three modules for two-level hierarchical and distributed architectures to address the drawbacks of sender-based message logging. The first module reduces the number of in-group control messages and, the rest, the number of inter-group control messages while localizing recovery. In addition, it can distribute the load of logging and keeping inter-group messages to group members as evenly as possible. The simulation results show the proposed protocol considerably outperforms the traditional protocol in terms of message logging overhead and scalability. key words: distributed system, hierarchical architecture, message logging, recovery, load balancing

Hybrid Message Logging Protocol with Little Overhead for Two-Level Hierarchical and Distributed Architectures