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We revisit the problem of distributed consensus in directed graphs tolerating crash failures; we improve the round and communication complexity of the existing protocols. Moreover, we prove that our protocol requires the optimal number of communication rounds, required by any protocol belonging to a specific class of crash-tolerant consensus protocols in directed graphs. 1998 ACM Subject Classification B.8.1 Reliability, Testing and Fault-Tolerance, E.1 Distributed data structures

Brief Announcement: Crash-Tolerant Consensus in Directed Graph Revisited