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Memory price will continue dropping in the next few years according to Gartner. Such trend renders it affordable for in-memory key-value stores (IMKVs) to maintain redundant memory-resident copies of each key-value pair to provision enhanced reliability and high availability services. Though contemporary IMKVs have reached unprecedented performance, delivering single-digit microsecond-scale latency...
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...
Hadoop is a popular open source implementation of the MapReduce programming model for cloud computing. However, it faces a number of issues to achieve the best performance from the underlying systems. These include a serialization barrier that delays the reduce phase, repetitive merges, and disk accesses, and the lack of portability to different interconnects. To keep up with the increasing volume...
Hadoop employs Java-based network transport stack on top of the Java Virtual Machine (JVM) for its data shuffling and merging purposes. Our examination reveals that JVMintroduces a significant amount of overhead to data processing capability of the native interface. Furthermore, JVM constrains the use of high-performance networking mechanisms such as RDMA (Remote Direct Memory Access) which has established...
Hadoop is a popular open-source implementation of the MapReduce programming model for cloud computing. However, it faces a number of issues to achieve the best performance from the underlying system. These include a serialization barrier that delays the reduce phase, repetitive merges and disk access, and lack of capability to leverage latest high speed interconnects. We describe Hadoop-A, an acceleration...
Sensor networks can be used to sense, collect and process information of monitored objects and transfer the information to users. It has been applied in many domains, such as military, environment observation, calamity forecasting, geo-spatial explore. A sensor Web refers to web accessible sensor networks and archived sensor data that can be discovered and accessed using standard protocols and application...
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