Load Test pada Microservice yang menerapkan CQRS dan Event Sourcing

Abstract. Load Test on Microservice implementing CQRS and Event Sourcing. In developing an application, determining the architecture is a very important job. This research implements microservice architecture with CQRS pattern and event sourcing on OpenAPI, API-driven and event-driven integration between services. Applying the right architecture can make the performance of the application faster. There are two test activities that are useful to find out the difference in the frequency of requests for APIdriven and event-driven that can affect response time, error rate and throughput, as well as analyze which architecture has better performance. The test is carried out using a load test technique using the JMeter tool. This study proves that microservices with CQRS and Event Sourcing patterns have 3.7% faster performance compared to API-driven, and communication between services has no effect on error rate and throughput. Keywords: microservice, load test, CQRS, event sourcing, software architecture Abstrak. Dalam pengembangan sebuah aplikasi, penentuan arsitektur merupakan pekerjaan yang sangat penting. Penelitian ini mengimplementasikan arsitektur microservice dengan pola CQRS dan event sourcing pada OpenAPI, integrasi antar service berbasis API-driven dan event-driven. Penerapan arsitektur yang tepat dapat membuat performansi dari aplikasi menjadi lebih cepat. Terdapat dua aktivitas pengujian yang berguna untuk mengetahui perbedaan frekuensi request pada API-driven dan eventdriven yang dapat mempengaruhi response time, error rate dan juga throughput, serta menganalisis arsitektur mana yang memiliki performa yang lebih baik. Pengujian dilakukan dengan teknik load test yang menggunuakan tool JMeter. Penelitian ini membuktikan bahwa microservice dengan pola CQRS dan Event Sourcing memiliki performansi lebih cepat 3,7% dibandingkan dengan API-driven, serta komunikasi antar service tidak berpengaruh pada error rate dan throughput.Kata Kunci: microservice, load Test, CQRS, event sourcing, software arsitektu

Microservices architectures in healthcare with Apache Kafka

Dissertação de mestrado em Informatics EngineeringOver the past few years, we have seen an exponential increase in the amount of data produced. This increase in data is due, in large part, to the massive use of sensors, as well as the immense amount of existing applications. Due to this factor, and in order to obtain relevant information through the data, companies, institutions and the scientific community are constantly looking for new solutions to be able to respond to the challenges. One of the areas where evolution is most needed is the area of healthcare, an area on which we all depend as a society. Every day, traditional healthcare information systems produce a large amount of data, making it complex to manage. Much of this data is produced by IoT devices, such as vital signs monitors, and in many cases can be critical to the patient’s health, as in the case of Intensive Care Units. In this sense, the main objective of this dissertation is to expose the advantages and disadvantages of the applicability of microservices architectures and the use of Apache Kafka in the health area, more specifically in Intensive Care Units where the information flow is critical. In order to support these objectives, a Proof of Concept was developed, based on a future real applicability, which will support the carrying out of analyzes and tests.Durante os últimos anos, temos assistido a um aumento exponencial da quantidade de dados produzida. Este aumento de dados deve-se, em grande parte, à utilização massiva de sensores, assim como à enorme quantidade de aplicações existentes. Devido a esse fator, e de forma a conseguir obter informações relevantes através dos dados, empresas, instituições e comunidade científica, estão constantemente à procura de novas soluções para conseguir responder aos desafios. Uma das áreas onde a evolução é mais necessária é a área da saúde, uma área da qual todos dependemos enquanto sociedade. Todos os dias, os sistemas tradicionais de informação em saúde produzem uma grande quantidade de dados, tornando-os complexos de gerir. Muitos destes dados são produzidos pelos dispositivos IoT, como os monitores de sinais vitais, e em muitos dos casos podem ser fulcrais para a saúde do paciente, como é o caso das Unidade de Cuidados Intensivos. Neste sentido, a presente dissertação tem como objetivo principal expor as vantagens e desvantagens da aplicabilidade das arquiteturas de microservices e da utilização do Apache Kafka na área da saúde, mais concretamente nas Unidades de Cuidados Intensivos onde o fluxo de informação é crítico. De forma a auxiliar estes objetivos, foi desenvolvido uma Prova de Conceito, tendo por base uma futura aplicabilidade real, que servirá de suporte à realização de análises e testes

Automated test-based learning and verification of performance models for microservices systems

Effective and automated verification techniques able to provide assurances of performance and scalability are highly demanded in the context of microservices systems. In this paper, we introduce a methodology that applies specification-driven load testing to learn the behavior of the target microservices system under multiple deployment configurations. Testing is driven by realistic workload conditions sampled in production. The sampling produces a formal description of the users' behavior through a Discrete Time Markov Chain. This model drives multiple load testing sessions that query the system under test and feed a Bayesian inference process which incrementally refines the initial model to obtain a complete specification from run-time evidence as a Continuous Time Markov Chain. The complete specification is then used to conduct automated verification by using probabilistic model checking and to compute a configuration score that evaluates alternative deployment options. This paper introduces the methodology, its theoretical foundation, and the toolchain we developed to automate it. Our empirical evaluation shows its applicability, benefits, and costs on a representative microservices system benchmark. We show that the methodology detects performance issues, traces them back to system-level requirements, and, thanks to the configuration score, provides engineers with insights on deployment options. The comparison between our approach and a selected state-of-the-art baseline shows that we are able to reduce the cost up to 73% in terms of number of tests. The verification stage requires negligible execution time and memory consumption. We observed that the verification of 360 system-level requirements took ~1 minute by consuming at most 34 KB. The computation of the score involved the verification of ~7k (automatically generated) properties verified in ~72 seconds using at most ~50 KB. (C)& nbsp;2022 The Author(s). Published by Elsevier Inc.& nbsp

A Design-Science-Research Approach

Neue Organisationsformen, wie evolutionäre Organisationen, bilden in vielen Kooperationsszenarien sozio-technische Konstrukte mit modernen CSCW Anwendungen aus. Daher erfordern Veränderungen dieser sozialen Systeme eine kontinuierliche Anpassung der technischen Tools an die neuen sozialen Konfigurationen. Diese Dissertation ist als Design Science Research (DSR) Projekt konzipiert und addressiert die folgende Forschungsfrage (RQ): “Wie können soziotechnische, evolutionäre Organisationen die Herausforderungen der joint optimization und des organizational choice während ihrer autopoietischen Veränderungsprozesse addressieren?” Die Fallstudie Viva con Agua de St. Pauli e.V. wurde mittels qualitativer und ethnographischer Methoden im Rahmen der entsprechenden DSR Zyklen untersucht. Das Forschungsprojekt fokussiert die Entwicklung von Artefakten indem sowohl eine technische, als auch eine soziale Perspektive eingenommen wird. Aus der technische Perspektive wird die RQ durch eine Microservice-Plattform adressiert. Die Architektur dient der Verteilung von Verantwortlichkeit für die Software in einem heterogenen Netzwerk von Entwickler:innen. Dabei müssen diverse neue Herausforderungen beachtet werden, wie etwa die Verteilung des User Interface. Durch die Betrachtung der RQ aus der sozialen Perspektive wird der USMU Workshop entwickelt. Dieses Artefakt dient der Verbindung der Charakteristika evolutionärer Organisationen mit agiler Software Entwicklung und mit Methoden des partizipativen Designs. Die Studien zeigen, dass beide Artefakte die RQ adressieren. Zudem konnte ich für beide Artefakte wertvolle Verbesserungsmöglichkeiten aufzeigen. Somit motivieren die Ergebnisse den nächsten Schritt des Projekts und die vorliegende Thesis wird Bestandteil des zyklischen Ablaufs eines DSR Projekts.The emergence of new types of organizational structures, such as evolutionary-teal organizations, almost always leads to the development of socio-technical constructs when it comes to working in collaboration with modern CSCW applications. A consequence of this is that the social system’s autopoietic change processes create challenges that compel one to adjust the implementation of the technical tool to the social system’s new configuration. This thesis is structured according to the design science research (DSR) approach and focuses on the research question (RQ): “How can socio-technical evolutionary-teal organizations address the challenges of joint optimization and organizational choice during their autopoietic processes?” For this purpose, the case study Viva con Agua de St. Pauli e.V. is investigated using a qualitative ethnographical approach during the DSR cycles. Addressing the RQ, two artifacts are designed from a technical as well as a social perspective. While the technical perspective primarily investigates the adjustments of technology, the social perspective focuses on the management of change in socio-technical evolutionary-teal organizations. I propose a microservice platform as an artifact that addresses the RQ from a technical perspective. The microservice architecture aims at spreading the responsibility for the software through a heterogeneous ecosystem of developers. The newly designed USMU workshop is addressing the RQ from the social perspective. It strives to intertwine the characteristics of evolutionary-teal organizations with agile software development and participatory design methods. In my studies, I examine the fact that both artifacts can be used to address the RQ. Additionally, I was able to identify valuable improvements for both of my artifacts. Hence, the project follows the lifecycle of a DSR project by reasoning through the results presented here for its next iteration