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In this paper, we describe our experiences and lessons learned from building a general-purpose in-memory key-value middleware, called HydraDB. HydraDB synthesizes a collection of state-of-the-art techniques, including continuous fault-tolerance, Remote Direct Memory Access (RDMA), as well as awareness for multicore systems, etc, to deliver a high-throughput, low-latency access service in a reliable...
Retransmissions serve as the basic building block that communication protocols use to achieve reliable data transfer. Until recently, the number of retransmissions was thought to follow a geometric (light-tailed) distribution. However, recent work shows that when the distribution of the packet sizes have infinite support, retransmission-based protocols may result in heavy-tailed delays and possibly...
Virtual machine (VM) provisioning is one of the fundamental components in virtualization-based cloud offerings. Modeling and analytically understanding the provisioning process is critical for the deployment and management of large-scale cloud. Based on extensive experiments on an example cloud system, we propose a queueing model to capture the important features related to scalability for the provisioning...
Distributed systems with multi-stage workflows are characterized by multiple logical stages which can either execute sequentially or concurrently and a single stage can be executed on one or more physical nodes. Knowing the mapping of logical stages to physical nodes is important to characterize performance and study resource bottlenecks. Often due to the physical magnitude of such systems and complexity...
Understanding the resource utilization in computing clouds is critical for efficient resource planning and better operational performance. In this paper, we propose two ways, from microscopic and macroscopic perspectives, to predict the resource consumption for data centers by statistically characterizing resource usage patterns. The first approach focuses on the usage prediction for a specific node...
Retransmissions serve as the basic building block that communication protocols use to achieve reliable data transfer. Until recently, the number of retransmissions were thought to follow a light tailed (in particular, a geometric) distribution. However, recent work seems to suggest that when the distribution of the packets have infinite support, retransmission-based protocols may result in heavy tailed...
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