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检索条件"任意字段=Proceedings of the 14th USENIX Conference on Networked Systems Design and Implementation"

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Aragog: Scalable Runtime Verification of Shardable networked systems 14

Aragog: Scalable Runtime Verification of Shardable Networked...

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14th usenix Symposium on Operating systems design and implementation (OSDI)

作者： Yaseen, Nofel Arzani, Behnaz Beckett, Ryan Ciraci, Selim Liu, Vincent Univ Penn Philadelphia PA 19104 USA Microsoft Res Redmond WA USA Microsoft Redmond WA USA

ISBN: (纸本)9781939133199

Network functions like firewalls, proxies, and NATs are instances of distributed systems that lie on the critical path for a substantial fraction of today's cloud applications. Unfortunately, validating these systems remains difficult due to their complex stateful, timed, and distributed behaviors. In this paper, we present the design and implementation of Aragog, a runtime verification system for distributed network functions that achieves high expressiveness, fidelity, and scalability. Given a property of interest, Aragog efficiently checks running systems for violations of the property with a scale-out architecture consisting of a collection of global verifiers and local monitors. To improve performance and reduce communication overhead, Aragog includes an array of optimizations that leverage properties of networked systems to suppress provably unnecessary system events and to shard verification over every available local and global component. We evaluate Aragog over several network functions including a NAT Gateway that powers Azure, identifying both design and implementation bugs in the process.

关键词： Gateways (computer networks)

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Aragog: scalable runtime verification of shardable networked systems 20

Aragog: scalable runtime verification of shardable networked...

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proceedings of the 14th usenix conference on Operating systems design and implementation

作者： Nofel Yaseen Behnaz Arzani Ryan Beckett Selim Ciraci Vincent Liu University of Pennsylvania Microsoft Research Microsoft

ISBN: (纸本)9781939133199

Network functions like firewalls, proxies, and NATs are instances of distributed systems that lie on the critical path for a substantial fraction of today's cloud applications. Unfortunately, validating these systems remains difficult due to their complex stateful, timed, and distributed *** this paper, we present the design and implementation of Aragog, a runtime verification system for distributed network functions that achieves high expressiveness, fidelity, and scalability. Given a property of interest, Aragog efficiently checks running systems for violations of the property with a scale-out architecture consisting of a collection of global verifiers and local monitors. To improve performance and reduce communication overhead, Aragog includes an array of optimizations that leverage properties of networked systems to suppress provably unnecessary system events and to shard verification over every available local and global component. We evaluate Aragog over several network functions including a NAT Gateway that powers Azure, identifying both design and implementation bugs in the process.

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proceedings of the 14th usenix Symposium on networked systems design and implementation, NSDI 2017

Proceedings of the 14th USENIX Symposium on Networked System...

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14th usenix Symposium on networked systems design and implementation, NSDI 2017

ISBN: (纸本)9781931971379

the proceedings contain 46 papers. the topics discussed include: datacenter RPCs can be general and fast;Eiffel: efficient and flexible software packet scheduling;loom: flexible and efficient NIC packet scheduling;exploiting commutativity for practical fast replication;flashield: a hybrid key-value cache that controls flash write amplification;size-aware sharding for improving tail latencies in in-memory key-value stores;FreeFlow: software-based virtual RDMA networking for containerized clouds;and blink: fast connectivity recovery entirely in the data plane.

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the CacheLib caching engine: design and experiences at scale 20

The CacheLib caching engine: design and experiences at scale

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proceedings of the 14th usenix conference on Operating systems design and implementation

作者： Benjamin Berg Daniel S. Berger Sara McAllister Isaac Grosof Sathya Gunasekar Jimmy Lu Michael Uhlar Jim Carrig Nathan Beckmann Mor Harchol-Balter Gregory R. Ganger Carnegie Mellon University Carnegie Mellon University and Microsoft Research Facebook

ISBN: (纸本)9781939133199

Web services rely on caching at nearly every layer of the system architecture. Commonly, each cache is implemented and maintained independently by a distinct team and is highly specialized to its function. For example, an application-data cache would be independent from a CDN cache. However, this approach ignores the difficult challenges that different caching systems have in common, greatly increasing the overall effort required to deploy, maintain, and scale each *** paper presents a different approach to cache development, successfully employed at Facebook, which extracts a core set of common requirements and functionality from otherwise disjoint caching systems. CacheLib is a general-purpose caching engine, designed based on experiences with a range of caching use cases at Facebook, that facilitates the easy development and maintenance of caches. CacheLib was first deployed at Facebook in 2017 and today powers over 70 services including CDN, storage, and application-data *** paper describes our experiences during the transition from independent, specialized caches to the widespread adoption of CacheLib. We explain how the characteristics of production workloads and use cases at Facebook drove important design decisions. We describe how caches at Facebook have evolved over time, including the significant benefits seen from deploying CacheLib. We also discuss the implications our experiences have for future caching design and research.

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A high-speed load-balancer design with guaranteed per-connection-consistency 20

A high-speed load-balancer design with guaranteed per-connec...

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proceedings of the 17th usenix conference on networked systems design and implementation

作者： Tom Barbette Chen Tang Haoran Yao Dejan Kostić Gerald Q. Maguire Panagiotis Papadimitratos Marco Chiesa KTH Royal Institute of Technology

ISBN: (纸本)9781939133137

Large service providers use load balancers to dispatch millions of incoming connections per second towards thousands of servers. there are two basic yet critical requirements for a load balancer: uniform load distribution of the incoming connections across the servers and per-connection-consistency (PCC), i.e., the ability to map packets belonging to the same connection to the same server even in the presence of changes in the number of active servers and load balancers. Yet, meeting both these requirements at the same time has been an elusive goal. Today's load balancers minimize PCC violations at the price of non-uniform load *** paper presents CHEETAH, a load balancer that supports uniform load distribution and PCC while being scalable, memory efficient, resilient to clogging attacks, and fast at processing packets. the CHEETAH LB design guarantees PCC for any realizable server selection load balancing mechanism and can be deployed in both a stateless and stateful manner, depending on the operational needs. We implemented CHEETAH on both a software and a Tofino-based hardware switch. Our evaluation shows that a stateless version of CHEETAH guarantees PCC, has negligible packet processing overheads, and can support load balancing mechanisms that reduce the flow completion time by a factor of 2-3x.

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the design, implementation, and Deployment of a System to Transparently Compress Hundreds of Petabytes of Image Files For a File-Storage Service 14

The Design, Implementation, and Deployment of a System to Tr...

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14th usenix Symposium on networked systems design and implementation (NSDI)

作者： Horn, Daniel Reiter Elkabany, Ken Lesniewski-Laas, Chris Winstein, Keith Dropbox San Francisco CA 94107 USA Stanford Univ Stanford CA 94305 USA

ISBN: (纸本)9781931971379

We report the design, implementation, and deployment of Lepton, a fault-tolerant system that losslessly compresses JPEG images to 77% of their original size on average. Lepton replaces the lowest layer of baseline JPEG compression-a Huffman code-with a parallelized arithmetic code, so that the exact bytes of the original JPEG file can be recovered quickly. Lepton matches the compression efficiency of the best prior work, while decoding more than nine times faster and in a streaming manner. Lepton has been released as open-source software and has been deployed for a year on the Dropbox file-storage backend. As of February 2017, it had compressed more than 203 PiB of user JPEG files, saving more than 46 PiB.

关键词： Open source software

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the design, implementation, and deployment of a system to transparently compress hundreds of petabytes of image files for a file-storage service 17

The design, implementation, and deployment of a system to tr...

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proceedings of the 14th usenix conference on networked systems design and implementation

作者： Daniel Reiter Horn Ken Elkabany Chris Lesniewski-Laas Keith Winstein Dropbox Stanford University

ISBN: (纸本)9781931971379

We report the design, implementation, and deployment of Lepton, a fault-tolerant system that losslessly compresses JPEG images to 77% of their original size on average. Lepton replaces the lowest layer of baseline JPEG compression--a Huffman code--with a parallelized arithmetic code, so that the exact bytes of the original JPEG file can be recovered quickly. Lepton matches the compression efficiency of the best prior work, while decoding more than nine times faster and in a streaming manner. Lepton has been released as open-source software and has been deployed for a year on the Dropbox file-storage backend. As of February 2017, it had compressed more than 203 PiB of user JPEG files, saving more than 46 PiB.

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BTrDB: Optimizing Storage System design for Timeseries Processing 14

BTrDB: Optimizing Storage System Design for Timeseries Proce...

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14th usenix conference on File and Storage Technologies (FAST)

作者： Andersen, Michael P. Culler, David E. Univ Calif Berkeley Berkeley CA 94720 USA

ISBN: (纸本)9781931971287

the increase in high-precision, high-sample-rate telemetry timeseries poses a problem for existing timeseries databases which can neither cope with the throughput demands of these streams nor provide the necessary primitives for effective analysis of them. We present a novel abstraction for telemetry timeseries data and a data structure for providing this abstraction: a time-partitioning version-annotated copy-on-write tree. An implementation in Go is shown to outperform existing solutions, demonstrating a throughput of 53 million inserted values per second and 119 million queried values per second on a four-node cluster. the system achieves a 2.9x compression ratio and satisfies statistical queries spanning a year of data in under 200ms, as demonstrated on a year-long production deployment storing 2.1 trillion data points. the principles and design of this database are generally applicable to a large variety of timeseries types and represent a significant advance in the development of technology for the Internet of things.

关键词： Digital storage

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the design and implementation of the Warp Transactional Filesystem 16

The design and implementation of the Warp Transactional File...

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proceedings of the 13th usenix conference on networked systems design and implementation

作者： Robert Escriva Emin Gün Sirer Computer Science Department Cornell University

ISBN: (纸本)9781931971294

this paper introduces the Warp Transactional Filesystem (WTF), a novel, transactional, POSIX-compatible filesystem based on a new file slicing API that enables efficient zero-copy file transformations. WTF provides transactional access spanning multiple files in a distributed filesystem. Further, the file slicing API enables applications to construct files from the contents of other files without having to rewrite or relocate data. Combined, these enable a new class of high-performance applications. Experiments show that WTF can qualitatively outperform the industry-standard HDFS distributed filesystem, up to a factor of four in a sorting benchmark, by reducing I/O costs. Microbenchmarks indicate that the new features of WTF impose only a modest overhead on top of the POSIX-compatible API.

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An Empirical Study of the design Space of Smart Home Routers 14th

An Empirical Study of the Design Space of Smart Home Routers

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14th International conference on Smart Homes and Health Telematics (ICOST)

作者： Zahid, Tausif Dar, Fouad Yousuf Hei, Xiaojun Cheng, Wenqing Huazhong Univ Sci & Technol Sch Elect Informat & Commun Wuhan 430074 Peoples R China

ISBN: (纸本)9783319396019;9783319396002

Home networks are becoming increasingly complex with the rising number of networked smart appliances with communication and control capabilities. these smart devices alongside diverse user applications usually share a single broadband access link via a router to access the Internet. the traffic streams competing for bandwidth on a best-effort basis may lead to poor quality-of-experience for users or malfunctioning of smart devices. Home routers used to only serve as dumb networking devices. Nevertheless, we expect that these routers will play a central role in communicating, networking and controlling emerging smart-home appliances. they should be programmable in a cost-effective way to efficiently transmit the real-time data, flexible in aggregating resources and convenient in providing management interfaces to upper-layer applications. the emerging software defined networking (SDN) offers a high degree of flexibility for implementing novel networking solutions to improve performances of distributed systems such as smart homes. the switching performance of the programmable switches is important for the forwarding service of the data plane after the traffic policies are deployed by the controller. In this paper, we conducted a measurement-based empirical study of the design space of different OpenFlow switches in multiple scenarios of a smart home network. Our testbed includes the performance of off-the-shelf commercial switches and FPGA-based networking boards. Our results demonstrate the trade-off between performance and flexibility for the OpenFlow switches. this empirical study focused on the throughput performance which is measured for different software-based OpenFlow switches. Zynq-based FPGA boards with networking capabilities demonstrate good potentials to facilitate the experimentation and implementation with high flexibility and sufficiently good performance. Our experiment results may provide insights into constructing evolvable and cost-effective softwa

关键词： Home networks

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