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Traditional coordination services for distributed applications do not scale well over wide-area networks (WAN): centralized coordination fails to scale with respect to the increasing distances in the WAN, and distributed coordination fails to scale with respect to the number of nodes involved. We argue that it is possible to achieve scalability over WAN using a hierarchical coordination architecture...
In order to take a consistent snapshot of a distributed system, it is necessary to collate and align local logs from each node to construct a pairwise concurrent cut. By leveraging NTP synchronized clocks, and augmenting them with logical clock causality information, Retroscope provides a lightweight solution for taking unplanned retrospective snapshots of past distributed system states. Instead of...
Coordination and consensus play an important role in datacenter and cloud computing, particularly in leader election, group membership, cluster management, service discovery, resource/access management, and consistent replication of the master nodes in services. Paxos protocols and systems provide a fault-tolerant solution to the distributed consensus problem and have attracted significant attention...
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