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Strong consistency is not hard to get: Twophase locking and twophase commit on thousands of cores 46th

Strong consistency is not hard to get: Twophase locking and ...

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46th International Conference on Very Large Data Bases, VLDB 2020

作者： Barthels, Claude Müller, Ingo Taranov, Konstantin Alonso, Gustavo Hoefler, Torsten Systems Group Department of Computer Science ETH Zurich Switzerland Scalable Parallel Computing Lab Department of Computer Science ETH Zurich Switzerland

Concurrency control is a cornerstone of distributed database engines and storage systems. In pursuit of scalability, a common assumption is that Two-Phase Locking (2PL) and Two-Phase Commit (2PC) are not viable solutions due to their communication overhead. Recent results, however, have hinted that 2PL and 2PC might not have such a bad performance. Nevertheless, there has been no attempt to actually measure how a state-of-the-art implementation of 2PL and 2PC would perform on modern hardware. The goal of this paper is to establish a baseline for concurrency control mechanisms on thousands of cores connected through a lowlatency network. We develop a distributed lock table supporting all the standard locking modes used in database engines. We focus on strong consistency in the form of strict serializability implemented through strict 2PL, but also explore read-committed and repeatableread, two common isolation levels used in many *** do not leverage any known optimizations in the locking or commit parts of the protocols. The surprising result is that, for TPC-C, 2PL and 2PC can be made to scale to thousands of cores and hundreds of machines, reaching a throughput of over 21 million transactions per second with 9.5 million New Order operations per second. Since most existing relational database engines use some form of locking for implementing concurrency control, our findings provide a path for such systems to scale without having to significantly redesign transaction management. To achieve these results, our implementation relies on Remote Direct Memory Access (RDMA). Today, this technology is commonly available on both Infiniband as well as Ethernet networks, making the results valid across a wide range of systems and platforms, including database appliances, data centers, and cloud environments. © VLDB Endowment.

关键词： Concurrency control

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Fine-Grained Re-Execution for Efficient Batched Commit of distributed Transactions 49th

Fine-Grained Re-Execution for Efficient Batched Commit of Di...

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49th International Conference on Very Large Data Bases, VLDB 2023

作者： Dong, Zhiyuan Wang, Zhaoguo Zhang, Xiaodong Xu, Xian Zhao, Changgeng Chen, Haibo Panda, Aurojit Li, Jinyang Institute of Parallel and Distributed Systems Shanghai Jiao Tong University China Department of Computer Science New York University United States

distributed transaction systems incur extensive cross-node communication to execute and commit serializable OLTP transactions. As a result, their performance greatly suffers. Caching data at nodes that execute transactions can cut down remote reads. Batching transactions for validation and persistence can amortize the communication cost during committing. However, caching and batching can significantly increase the likelihood of conflicts, causing expensive aborts. In this paper, we develop Hackwrench to address the challenge of caching and batching. Instead of aborting conflicted transactions, Hackwrench tries to repair them using fine-grained re-execution by tracking the dependencies of operations among a batch of transactions. Tracked dependencies allowHackwrench to selectively invalidate and re-execute only those operations necessary to "fix" the conflict, which is cheaper than aborting and executing an entire batch of transactions. Evaluations using TPC-C and other micro-benchmarks show that Hackwrench can outperform existing commercial and research systems including FoundationDB, Calvin,COCO, and Sundial under comparable settings. © 2023, VLDB Endowment. All rights reserved.

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Database Deadlock Diagnosis for Large-Scale ORM-Based Web Applications 39

Database Deadlock Diagnosis for Large-Scale ORM-Based Web Ap...

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39th IEEE International Conference on Data Engineering, ICDE 2023

作者： Dong, Zhiyuan Wang, Zhaoguo Yi, Chuanwei Xu, Xian Zhang, Jinyuan Li, Jinyang Chen, Haibo Shanghai Jiao Tong University Institute of Parallel and Distributed Systems China New York University Department of Computer Science United States

ISBN: (纸本)9798350322279

Today, most database-backed web applications depend on the database to handle deadlocks. At runtime, the database monitors the progress of transaction execution to detect deadlocks and abort affected transactions. However, this common detect-and-recover strategy is costly to performance as aborted transactions waste CPU *** avoid deadlock-induced performance degradation, developers aim to reorganize the application code to remove deadlocks. Unfortunately, doing so is difficult for web applications. Not only do their implementations include hundreds of thousands of LoCs, but they also use third-party object-relational mapping (ORM) frameworks which hide database access details. Consequently, it is hard for developers to accurately diagnose *** propose WeSEER, a deadlock diagnosis tool for web applications. To overcome the opacity of ORMs, WeSEER performs concolic execution on unit tests to extract a web application's transactions as a sequence of template statements with symbolic inputs as well as path conditions that enable the sequence. WeSEER then analyzes the extracted transactions based on fine-grained lock modeling to identify potential deadlocks and report the code locations that cause them. We implement WeSEER for Java-based (OpenJDK) web applications, and use it to analyze two popular open-source e-commerce applications, Broadleaf and Shopizer. WeSEER has successfully identified 18 potential deadlocks in Broadleaf and Shopizer. Eliminating these identified deadlocks can result in up to 39.5× and 4.5× throughput improvement for Broadleaf and Shopizer, respectively. © 2023 IEEE.

关键词： Database systems

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chitSMS: Community health information tracking system using short message service

chitSMS: Community health information tracking system using ...

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2010 3rd International Conference on Human-Centric Computing, HumanCom 2010

作者： Manguni Jr., Reynaldo Navarro, Mel Leandro Rosario, Kathleen Festin, Cedric Angelo Department of Computer Science Networks and Distributed Systems Group University of Philippines Diliman Quezon City Philippines

ISBN: (纸本)9781424475704

Community Health Information Tracking System using Short Message Service (chitSMS) is an extension of CHITS which is a system that stores health records of patients in the barangay. Another project incorporated a mobile component in CHITS, enabling the health worker to visit the patient, do routine check-ups and medical services, and update CHITS when the health worker returns to the health center. Without a remote connection, however, the health worker has to return frequently to the usually distant health center to update the CHITS database with the data gathered from the field consult. chitSMS addresses this by using SMS as a mode of remote data transfer. It ensures the reliable transmission of the data by implementing a modified selective repeat protocol. Furthermore, it performs the Deflate algorithm for compression of the data being sent to minimize the cost. © 2010 IEEE.

关键词： Data transfer

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Towards a generic architecture for mobile object-oriented applications

Towards a generic architecture for mobile object-oriented ap...

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Workshop on IEEE Service Portability and Virtual Customer Environments, IEEE Globecom 2000

作者： Haahr, M. Cunningham, R. Cahill, V. Distributed Systems Group Department of Computer Science University of Dublin Trinity College Dublin 2 Ireland

ISBN: (纸本)078037133X

Our previous work in mobility support for CORBA applications resulted in the design and implementation of the Architecture for Location-Independent CORBA Environments (ALICE). The first version of ALICE enabled CORBA objects running on mobile devices to interact transparently with objects hosted by off-the-shelf CORBA implementations without relying on a centralised location register to keep track of their whereabouts. This paper presents the second version of ALICE on which work is ongoing. The improved architecture retains the features of the original and adds support for disconnected operation in the form of caching of server functionality on the client side. Furthermore, the architecture is being generalised beyond CORBA in order to make it applicable to other distribution infrastructures, such as Java RMI and DCOM. © 2001 IEEE.

关键词： Common object request broker architecture (CORBA)

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Utilization of Database Spatial Queries for Region of Interest Extraction in Stored Images

Utilization of Database Spatial Queries for Region of Intere...

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2022 IEEE Region 10 International Conference, TENCON 2022

作者： Valdez, Julian Troy C. Tan, Wilson M. University of the Philippines Diliman Department of Computer Science Networks and Distributed Systems Group Quezon City Philippines

ISBN: (数字)9781665450959

ISBN: (纸本)9781665450959

Image processing, specifically extracting regions of interest, being a costly operation would benefit from a method of storing its output region and input image data in a database for future querying so as to prevent re-execution of the processing operation. This study investigates the performance of using built-in spatial queries found in a couple of modern Database systems to store and retrieve specific regions of image data. After testing two widely used Database software: MongoDB and Postgresql, results have shown that MongoDB performs better in terms of average and tail latency as well as efficiency in disk space consumption. © 2022 IEEE.

关键词： Query processing

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ADVISE – A framework for evaluating cloud service elasticity behavior 12

ADVISE – A framework for evaluating cloud service elasticit...

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12th International Conference on Service-Oriented Computing, ICSOC 2014

作者： Copil, Georgiana Trihinas, Demetris Truong, Hong-Linh Moldovan, Daniel Pallis, George Dustdar, Schahram Dikaiakos, Marios Distributed Systems Group Vienna University of Technology Austria Computer Science Department University of Cyprus Cyprus

ISBN: (纸本)9783662453902

Complex cloud services rely on different elasticity control processes to deal with dynamic requirement changes and workloads. However, enforcing an elasticity control process to a cloud service does not always lead to an optimal gain in terms of quality or cost, due to the complexity of service structures, deployment strategies, and underlying infrastructure dynamics. Therefore, being able, a priori, to estimate and evaluate the relation between cloud service elasticity behavior and elasticity control processes is crucial for runtime choices of appropriate elasticity control processes. In this paper we present ADVISE, a framework for estimating and evaluating cloud service elasticity behavior. ADVISE gathers service structure, deployment, service runtime, control processes, and cloud infrastructure information. Based on this information, ADVISE utilizes clustering techniques to identify cloud elasticity behavior produced by elasticity control. Our experiments show that ADVISE can estimate the expected elasticity behavior, in time, for different cloud services thus being a useful tool to elasticity controllers for improving the quality of runtime elasticity control decisions. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Elasticity

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WifiGO: Assessment of PUV Viability for Opportunistic Coverage Mapping of WiFi Networks

WifiGO: Assessment of PUV Viability for Opportunistic Covera...

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2024 IEEE International Conference on Internet of Things and Intelligence systems, IoTaIS 2024

作者： Pecson, Jeff Nereo G. Tan, Wilson M. Festin, Cedric Angelo M. Dulva, Philip Angelo Y. Networks and Distributed Systems Group Department of Computer Science University of the Philippines - Diliman Metro Manila Philippines

ISBN: (纸本)9798331521219

Current methods in mapping the availability of WiFi networks, such as crowdsourcing platforms (e.g. Project BASS and CoverageMap) and dedicated wardriving, face limitations in terms of data recency, volume, and cost-effectiveness. Due to the downsides of both these methods, opportunistic wardriving is proposed which utilizes public utility vehicles (PUVs). This study investigates the feasibility of PUVs as potential wardriving vehicles for opportunistic coverage mapping. This method is cost-efficient and removes the problem of data recency because of its continuous daily trips. The findings suggest that opportunistic wardriving with PUVs is viable for wardriving with its capability to detect a high volume of access points (APs). Multiple runs within the University of the Philippines Diliman campus showed the PUVs’ effectiveness in detecting a significant number of APs, with higher success rates at closer distances. Comparatively, warwalking detected fewer APs, but there was a significant overlap between the methods. The study also highlighted significant differences in detected AP types, with wardriving finding more mobile hotspots and miscellaneous devices than warwalking. Overall, the results underline the effectiveness of PUVs in providing extensive WiFi coverage data and further enhancements to the detection system could optimize the approach. ©2024 IEEE.

关键词： Wireless local area networks (WLAN)

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Some ideas on support for fault tolerance in COMANDOS, an object oriented distributed system 4

Some ideas on support for fault tolerance in COMANDOS, an ob...

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4th Workshop on ACM SIGOPS European Workshop, EW 1990

作者： Tangney, Brendan Cahill, Vinny Horn, Chris Herity, Dominic Judge, Alan Starovic, Gradimir Sheppard, Mark Distributed Systems Group Department of Computer Science Trinity College University of Dublin Dublin 2 Ireland

ISBN: (纸本)9781450373371

The distributed systems group in Trinity have been concerned with fault tolerance for a number years and are now turning our attention to the topic with renewed interest (and urgency). Specifically we are concerned to provide mechanisms for fault tolerance in thc Oisin kernel [5] - the local implementation of the COMANDOS object oriented distributed system [12]. This short position paper outlines our experience gained to date, some of the lessons we have learned and the avenues which we are currently investigating in order to make Oisin reliable. © 1990 Association for Computing Machinery Inc. All rights reserved.

关键词： Fault tolerance

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Conformance, genericity, inheritance and enhancement

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European Conference on Object-Oriented Programming, ECOOP 1987

作者： Horn, Chris Distributed Systems Group Department of Computer Science Trinity College Dublin IRL Dublin 2 Ireland

ISBN: (纸本)9783540183532

A recent paper by Meyer compared the usefulness of Genericity and Inheritance as a basis fur static type checking in object oriented systems. Conformance is also being considered by some researchers, and Meyer’s paper is reexamined here using Conformance. Some problems result related to the conformance of formal and actual parameters of operations. Additional rules for conformance are introduced to overcome these problem and these lead naturally to the concept of Enhancement as a union of the techniques of Conformance, Genericity and Inheritance. This work has been partially sponsored under the ESPRIT programme, in project 834 Comandos - Construction and Management of distributed Office systems. © 1987, Springer-Verlag Berlin Heidelberg.

关键词： Object oriented programming

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