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7 results on '"saga pattern"'

1. Identification of monolith functionality refactorings for microservices migration.

Author

Correia, José and Rito Silva, António

Subjects
HEURISTIC, SYSTEMS development, DATABASES
Abstract

In the process of migrating a monolith to a microservice architecture, functionalities which execute on top of a single database as ACID transactions, have their execution split between several databases, one for each microservice. Therefore, the complexity of functionality migration increases, because of the lack of isolation of the functionality execution, which has to be handled by following an eventual consistency model. On the other hand, the object‐oriented approach, commonly followed in the development of monolith systems, promotes fine‐grained interactions in the functionalities implementation, which further increases the migration effort due to the large number of remote invocations between microservices, because it increases the number of microservices transactions that have to eventually be consistent. The main contribution of this paper is a heuristic method to help the software architect on the identification of functionality refactorings, to reduce the effort required to migrate the functionality to microservices when applying the SAGA pattern in the functionality microservices implementation. The heuristic accuracy and efficiency of the method is evaluated using a dataset extracted from 78 codebases and by comparing the results with expert refactorizations. Additionally, a performance analysis of the heuristic implementation is done. [ABSTRACT FROM AUTHOR]

Published
2022
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2. Enhancing Saga Pattern for Distributed Transactions within a Microservices Architecture.

Author

Daraghmi, Eman, Zhang, Cheng-Pu, and Yuan, Shyan-Ming

Subjects
CACHE memory, DATABASES
Abstract

The saga pattern manages transactions and maintains data consistency across distributed microservices via utilizing local sequential transactions that update each service and publish messages to trigger the next ones. Failure by one transaction causes the execution of compensating transactions that counteract the preceding one. However, saga lacks isolation, meaning that reading and writing data from an incomplete transaction is allowed. Therefore, this research proposes an enhanced saga pattern that resolves the lack of isolation issue via the use of the quota cache and the commit-sync service. Some transactions will be transferred from the database layer to the memory layer. Thus, no wrong commit to the main database will occur. If a microservice fails to be completed, the other microservices will run compensation transactions to rollback the changes that only affect the cache layer instead of the database layer. Database commit will be performed when all transactions are completed successfully. A lightweight microservices-based e-commerce system was implemented for comparison. Experiments were conducted for validation and evaluation. Results demonstrate that the proposal has the capability of resolving the lack of isolation. Results indicate that the proposal achieves better performance not only in typical cases but also in the scenario that needs to handle exceptions. [ABSTRACT FROM AUTHOR]

Published
2022
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3. Enhancing Saga Pattern for Distributed Transactions within a Microservices Architecture

Author

Eman Daraghmi, Cheng-Pu Zhang, and Shyan-Ming Yuan

Subjects
microservice, saga pattern, distributed transaction, read isolation, Technology, Engineering (General). Civil engineering (General), TA1-2040, Biology (General), QH301-705.5, Physics, QC1-999, Chemistry, QD1-999
Abstract

The saga pattern manages transactions and maintains data consistency across distributed microservices via utilizing local sequential transactions that update each service and publish messages to trigger the next ones. Failure by one transaction causes the execution of compensating transactions that counteract the preceding one. However, saga lacks isolation, meaning that reading and writing data from an incomplete transaction is allowed. Therefore, this research proposes an enhanced saga pattern that resolves the lack of isolation issue via the use of the quota cache and the commit-sync service. Some transactions will be transferred from the database layer to the memory layer. Thus, no wrong commit to the main database will occur. If a microservice fails to be completed, the other microservices will run compensation transactions to rollback the changes that only affect the cache layer instead of the database layer. Database commit will be performed when all transactions are completed successfully. A lightweight microservices-based e-commerce system was implemented for comparison. Experiments were conducted for validation and evaluation. Results demonstrate that the proposal has the capability of resolving the lack of isolation. Results indicate that the proposal achieves better performance not only in typical cases but also in the scenario that needs to handle exceptions.

Published
2022
Full Text
View/download PDF

4. Comparison of Choreography vs Orchestration Based Saga Patterns in Microservices

Author

Aydın, Şahin, Çebi, Cem Berke, Işık Üniversitesi, İktisadi, İdari ve Sosyal Bilimler Fakültesi, Enformasyon Teknolojileri Bölümü, Işık University, Faculty of Economics, Administrative and Social Sciences, Department of Information Technologies, Işık Üniversitesi, Mühendislik ve Doğa Bilimleri Fakültesi, Bilgisayar Mühendisliği Bölümü, Işık University, Faculty of Engineering and Natural Sciences, Department of Computer Engineering, Aydın, Şahin, and Çebi, Cem Berke

Subjects
Styling, Architecture patterns, Orchestration, Choreography, Saga pattern, Design patterns, Transaction processing, Software project, Stream processing, Key, Database systems, SQL database, Microservice architecture, Concurrency control
Abstract

Microservice Architecture (MSA) is a design and architecture pattern created to deal with the challenges of conventional software programs in terms of stream processing, highly available flexibility, and infrastructural agility. Despite the many advantages of MSA, designing isolated services using the autonomous Databases per Services paradigm is difficult. We realized that because each microservice will have its repository, ensuring data coherence between databases becomes difficult, especially in reversals, where operations transcend different sites. Distributed networked transactions and rollbacks can be efficiently handled using two-phase commitment methods in hardware virtualization using RDBMS databases. However, these approaches can't be used in micro-services with segregated NoSQL servers. Three issues have been addressed in this study: (i) investigate the implementation of event choreography and orchestration methods for the Saga pattern execution in MSA, (ii) existing reality suggestions on the saga pattern adoption and implementation besides the use cases, and (iii) introduce the disbursed transaction records and rollbacks challenges in isolated No-SQL databases with reliant collections in MSA. Publisher's Version

Published
2022

5. Arquitectura de microservicios en Kubernetes

Author

López Rico, Sergio, Otón Tortosa, Salvador, and Universidad de Alcalá. Escuela Politécnica Superior

Subjects
Informática, CICD, Docker, Microservicios, Kubernetes, Saga pattern, Computer science
Abstract

El desarrollo de aplicaciones online está en constante crecimiento. Cada vez hay un mayor número de usuarios, lo que se traduce en necesitar más recursos de hardware para atender sus peticiones. Además, con el tiempo las aplicaciones van teniendo más complejidad de software, cosa que complica los despliegues en producción y con el crecimiento de la aplicación crece el número de desarrolladores trabajando en ella, lo que dificulta la organización del proyecto. Por eso surgen, entre otros, los siguientes problemas que trataré en este trabajo: ● Satisfacer la demanda en momentos de carga elevada. ● Uso de metodología que facilite el desarrollo de estas aplicaciones., The development of online applications is constantly growing. As time goes by, there are more users, and therefore, we need more hardware resources in order to process their requests. Furthermore, the application's software complexity increases, so releasing them to production becomes harder. Finally, as more complex applications, the more developers we are going to need working on it, so, also, the project management gains complexity. For that reason, I am going to discuss about the surging problems during this project: ● Satisfy demand in heavy load times. ● Methodologies that ease the development of these applications., Grado en Ingeniería de Computadores

Published
2022

6. Distributed transaction management in microservice architecture

Author

Gördesli, Mustafa, Varol, Asaf, and Maltepe Üniversitesi, Lisansüstü Eğitim Enstitüsü

Subjects
Docker, REST mimari, Microservices, Mikroservis, REST architecture, 2PC, Cloud computing, Event based architecture, Saga pattern, Bulut bilişim, Servis tabanlı mimari
Abstract

Bu çalışmada mikroservis mimarisi ile oluşturulmuş servisler üzerinde gerçekleşen birbirinden bağımlı ya da bağımsız dağıtık işlemlerin yönetim şekilleri ele alınmıştır. Monolitik yapılarda tüm işlemler tek bir sistem tarafından kontrol edildiği için dağıtık işlemlerin kontrolü de bu servis tarafından rahatlıkla yapılabilmektedir. Ancak, Monolitik yapılardan mikroservis mimarisine geçişte en çok karşılaşılan problemlerden biri, dağıtık işlemlerin birbiri ile ilişkisi olmayan mikroservislerde düzenli bir biçimde nasıl işleneceğidir. Bu probleme getirilen çözümler, mikroservislerin kuyruk sistemi ile olay tabanlı bir şekilde birbiri ile iletişimi ya da yönetici bir servis ile mikroservislerin sıralı ve düzenli bir şekilde kontrol edilmesidir. Bu çözümler daha çok mikroservislerin sıralı bir şekilde çalışması ile ilişkilidir. Bu tezde bu probleme çözüm olarak, çıktı kontrol servisi ile dağıtık işlemlerin paralel bir şekilde mikroservislerin çıktıları işlenmiştir. Bunun yanı sıra dağıtık işlemlerin işlenmesi sırasında oluşabilecek bir hata sonrası yapılacak olan geri alma işlemlerinin nasıl yapılabileceği ele alınmıştır., In this study, the management of dependent or independent distributed transactions in microservice architecture are discussed. Since all transactions in monolithic architecture are controlled by a single system, the control of distributed transactions can be easily done by this service. However, one of the most encountered problems in migration from monolithic architecture to microservice architecture is handling distributed transactions. For the solutions, the event-based communication of microservices with a message queue system or the sequential control of microservices with a manager service can be offered. These solutions were mostly related to the sequential operation of microservices. In this thesis, the solution to this problem is to process the outputs of microservices in parallel with the output control service. In addition, it is also discussed how to make rollback operations after an error that may occur during the processing of distributed transactions.

Published
2022

7. Technical Challenges of Microservices Migration

Author

Neves, João Carlos Ribeiro Dias and Azevedo, Isabel de Fátima Silva

Subjects
Industry survey, Transações distribuídas, Migração, Microservices, Systematic mapping study, Distributed transactions, Questionário à industria, Saga pattern, Migration
Abstract

Submitted by Ana Rebelo (amsr@isep.ipp.pt) on 2020-03-18T09:32:21Z No. of bitstreams: 1 DM_JoaoNeves_2019_MEI.pdf: 6486454 bytes, checksum: 321a1088f21a3081213706006fe2fcc2 (MD5) Approved for entry into archive by Ana Rebelo (amsr@isep.ipp.pt) on 2020-03-18T09:33:06Z (GMT) No. of bitstreams: 1 DM_JoaoNeves_2019_MEI.pdf: 6486454 bytes, checksum: 321a1088f21a3081213706006fe2fcc2 (MD5) Made available in DSpace on 2020-03-18T09:33:06Z (GMT). No. of bitstreams: 1 DM_JoaoNeves_2019_MEI.pdf: 6486454 bytes, checksum: 321a1088f21a3081213706006fe2fcc2 (MD5) Previous issue date: 2019

Published
2019

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