Daniele Sciascia

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This paper proposes Clock-RSM, a new state machine replication protocol that uses loosely synchronized physical clocks to totally order commands for geo-replicated services. Clock-RSM assumes realistic non-uniform latencies among replicas located at different data centers. It provides low-latency linearizable replication by overlapping 1) logging a command(More)
Deferred update replication is a well-known approach to building data management systems as it provides both high availability and high performance. High availability comes from the fact that any replica can execute client transactions; the crash of one or more replicas does not interrupt the system. High performance comes from the fact that only one(More)
This paper explores the possibility of implementing the widely deployed Paxos consensus protocol in network devices. We present two different approaches: (<i>i</i>) a detailed design description for implementing the full Paxos logic in SDN switches, which identifies a sufficient set of required OpenFlow extensions; and (<i>ii</i>) an alternative, optimistic(More)
Many database replication protocols are based on the deferred update replication technique. In deferred update replication, transactions are executed by a single server, and certified and possibly committed by every server. Thus, servers must store a full copy of the database. This assumption is detrimental to performance since servers may not be able to(More)
This paper proposes Clock-RSM, a new state machine replication protocol that uses loosely synchronized physical clocks to totally order commands for geo-replicated services. Clock-RSM assumes realistic non-uniform latencies among replicas located at different data centers. It provides low-latency linearizable replication by overlapping 1) logging a command(More)
Many current online services are deployed over geographically distributed sites (i.e., datacenters). Such distributed services call for geo-replicated storage, that is, storage distributed and replicated among many sites. Geographical distribution and replication can improve locality and availability of a service. Locality is achieved by moving data closer(More)
Deferred update replication (DUR) is an established approach to implementing highly efficient and available storage. While the throughput of read-only transactions scales linearly with the number of deployed replicas in DUR, the throughput of update transactions experiences limited improvements as replicas are added. This paper presents Parallel Deferred(More)
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