Speaking

Sometimes, it’s ok to wait for correct results of a long Extract-Transform-Load data process. Sometimes, it’s not: better have slightly correct results sooner. But if one still wants to have both, there’s an architecture for that. It’s called Lambda architecture, and it has been documented. One of the issues of Lambda architecture is that one needs to maintain two processes: the standard correct batching model, and the new real-time but incomplete streaming model. This translates to higher development costs, and can lead very higher maintenance costs. What if one could get the benefits of both worlds? In this talk, I’ll present the Lambda architecture, its foundations, and how it’s usually implemented. I’ll also present the Kappa architecture that solves issues from the Lambda architecture. This will be done via some use-cases, banking and/or e-commerce. Finally, I’ll demo a sample of the Kappa architecture in action.

While 'software is eating the world', those who are able to manage the huge mass of data will emerge out on the top. The batch processing model has been faithfully serving us for decades. However, it might have reached the end of its usefulness for all but some very specific use-cases. As the pace of businesses increases, most of the time, decision makers prefer slightly wrong data sooner, than 100% accurate data later. Stream processing matches this usage: instead of managing the entire bulk of data, manage pieces of them as soon as they become available. In this talk, I’ll define the context in which the batch processing model was born, the reasons that are behind the new stream processing one, how they compare, what are their pros and cons, and a list of existing technologies implementing the latter with their most characteristics. I’ll conclude by describing one possible use-case of data streaming that is not possible with batches: display in (near) real-time all trains in Switzerland and their position on a map. I’ll go through all requirements and the design. Finally, using an OpenData endpoint and the Hazelcast platform, I’ll try to impress attendees with a demo of it.

While 'software is eating the world', those who are able to manage the huge mass of data will emerge out on the top. The batch processing model has been faithfully serving us for decades. However, it might have reached the end of its usefulness for all but some very specific use-cases. As the pace of businesses increases, most of the time, decision makers prefer slightly wrong data sooner, than 100% accurate data later. Stream processing matches this usage: instead of managing the entire bulk of data, manage pieces of them as soon as they become available. In this talk, I’ll define the context in which the batch processing model was born, the reasons that are behind the new stream processing one, how they compare, what are their pros and cons, and a list of existing technologies implementing the latter with their most characteristics. I’ll conclude by describing one possible use-case of data streaming that is not possible with batches: display in (near) real-time all trains in Switzerland and their position on a map. I’ll go through all requirements and the design. Finally, using an OpenData endpoint and the Hazelcast platform, I’ll try to impress attendees with a demo of it.

Sometimes, it’s ok to wait for correct results of a long Extract-Transform-Load data process. Sometimes, it’s not: better have slightly correct results sooner. But if one still wants to have both, there’s an architecture for that. It’s called Lambda architecture, and it has been documented. One of the issues of Lambda architecture is that one needs to maintain two processes: the standard correct batching model, and the new real-time but incomplete streaming model. This translates to higher development costs, and can lead very higher maintenance costs. What if one could get the benefits of both worlds? In this talk, I’ll present the Lambda architecture, its foundations, and how it’s usually implemented. I’ll also present the Kappa architecture that solves issues from the Lambda architecture. This will be done via some use-cases, banking and/or e-commerce. Finally, I’ll demo a sample of the Kappa architecture in action.

Sometimes, it’s ok to wait for correct results of a long Extract-Transform-Load data process. Sometimes, it’s not: better have slightly correct results sooner. But if one still wants to have both, there’s an architecture for that. It’s called Lambda architecture, and it has been documented. One of the issues of Lambda architecture is that one needs to maintain two processes: the standard correct batching model, and the new real-time but incomplete streaming model. This translates to higher development costs, and can lead very higher maintenance costs. What if one could get the benefits of both worlds? In this talk, I’ll present the Lambda architecture, its foundations, and how it’s usually implemented. I’ll also present the Kappa architecture that solves issues from the Lambda architecture. This will be done via some use-cases, banking and/or e-commerce. Finally, I’ll demo a sample of the Kappa architecture in action.

While a microservices architecture is more scalable than a monolith, it has a direct hit on performance. To cope with that, one performance improvement is to set up a cache. It can be configured for database access, for REST calls or just to store session state across a cluster. In this demo-based talk, I’ll show how Hazelcast In-Memory Data Grid can help you in each one of those areas and how to configure it. Hint: it’s much easier than one would expect.

While "software is eating the world", those who are able to best manage the huge mass of data will emerge out on the top. Some countries in Europe understand the potential there's in existing data that sits behind closed fences, and passed laws to make this data available to everyone. On the other hand, the batch processing model gets more and more obsolete: users want the information as soon as possible. While there’s a trade-off between correctness of data, and its speed of delivery, most business decisions do not rely on 100% correct data. In this talk, I’ll explain how one can leverage the data related to public transportation in Switzerland, to display them in (near) real-time on a map.

While a microservices architecture is more scalable than a monolith, it has a direct hit on performance. To cope with that, one performance improvement is to set up a cache. It can be configured for database access, for REST calls or just to store session state across a cluster. In this demo-based talk, I’ll show how Hazelcast In-Memory Data Grid can help you in each one of those areas and how to configure it. Hint: it’s much easier than one would expect.

So, you’ve migrated your application to Reactive Microservices to get the last ounce of performance from your servers. Perhaps you forgot about the logs: they be a huge roadblock on the road. Application produce logs, and they need to be stored e.g. in Elasticsearch, with the minimum of fuss and the fastest way possible. I’ll show you some insider tips and tricks taken from our experience to put you on the track toward fast(er) log management.

Kubernetes allows a lot. After discovering its features, it’s easy to think it can magically transform your application deployment process into a painless no-event. For Hello World applications, that is the case. Unfortunately, not many of us do deploy such applications day-to-day. You need to think about application backward compatibility, possible rollback, database schema migration, etc. I believe the later is one of the biggest pain point. In this talk, I’ll demo how to update a Spring Boot app deployed on a Kubernetes cluster with a non-trivial database schema migration with the help of Flyway, while keeping the service up during the entire update process.

While a microservices architecture is more scalable than a monolith, it has a direct hit on performance. To cope with that, one performance improvement is to set up a cache. It can be configured for database access, for REST calls or just to store session state across a cluster of server nodes. In this demo-based talk, I'll show how Hazelcast In-Memory Data Grid can help you in each one of those areas and how to configure it. Hint: it's much easier than one would expect.

In the latest years, there has been some push-back against frameworks, and more specifically annotations: some call them magic Obviously, they make understanding the flow of the application harder Spring and Spring Boot latest versions go along this trend, by offering an additional way to configure beans with explicit code instead of annotations It's declarative in the sense it looks like configuration, though it's based on Domain-Specific Language(s) This talk aims to demo a step-by-step process to achieve that.

While a microservices architecture is more scalable than a monolith, it has a direct hit on performance. To cope with that, one performance improvement is to set up a cache. It can be configured for database access, for REST calls or just to store session state across a cluster. In this demo-based talk, I’ll show how Hazelcast In-Memory Data Grid can help you in each one of those areas and how to configure it. Hint: it’s much easier than one would expect.

Si une architecture en microservices est plus évolutive qu’une approche monolithique, elle a toutefois un impact direct sur les performances. Pour adresser cela, une amélioration de performance peut être obtenue en mettant en oeuvre un cache. II peut servir aux accés bases de données, aux invocations REST ou simplement pour conserver un état de session dans un cluster de noeuds serveur. Dans cette présentation basée sur des démonstrations, je vais vous montrer comment la solution Hazelcast "In Memory Data Grid" peut vous aider dans chacun de ces domaines et comment le configurer. Un petit indice: c’est beaucoup plus simple que vous pourriez le penser

While "software is eating the world", those who are able to best manage the huge mass of data will emerge out on the top. Some countries in Europe understand the potential there's in existing data that sits behind closed fences, and passed laws to make this data available to everyone. On the other hand, the batch processing model gets more and more obsolete: users want the information as soon as possible. While there’s a trade-off between correctness of data, and its speed of delivery, most business decisions do not rely on 100% correct data. In this talk, I’ll explain how one can leverage the data related to public transportation in Switzerland, to display them in (near) real-time on a map.

In Kubernetes, operators allow the API to be extended to your heart content. If one task requires too much YAML, it’s easy to create an operator to take care of the repetitive cruft, and only require a minimum amount of YAML. On the other hand, since its beginnings, the Go language has been advertised as closer to the hardware, and is now ubiquitous in low-level programming. Kubernetes has been rewritten from Java to Go, and its whole ecosystem revolves around Go. For that reason, It’s only natural that Kubernetes provides a Go-based framework to create your own operator. While it makes sense, it requires organizations willing to go down this road to have Go developers, and/or train their teams in Go. While perfectly acceptable, this is not the only option. In fact, since Kubernetes is based on REST, why settle for Go and not use your own favorite language? In this talk, I’ll describe what is an operator, how they work, how to design one, and finally demo a Java-based operator that is as good as a Go one.

Kotlin is one of those 'new' JVM languages that are currently rocking the boat. Although it’s made a great impact on Android, it’s equally good on the server side. As Domain-Specific Languages are constrained by the language they run on, Kotlin frees developers from Java fluent builders to propose something better. Using the Vaadin web framework as an example, I’ll demo how one could design its own DSL with Kotlin.

In Kubernetes, operators allow the API to be extended to your heart content. If one task requires too much YAML, it’s easy to create an operator to take care of the repetitive cruft, and only require a minimum amount of YAML. On the other hand, since its beginnings, the Go language has been advertised as closer to the hardware, and is now ubiquitous in low-level programming. Kubernetes has been rewritten from Java to Go, and its whole ecosystem revolves around Go. For that reason, It’s only natural that Kubernetes provides a Go-based framework to create your own operator. While it makes sense, it requires organizations willing to go down this road to have Go developers, and/or train their teams in Go. While perfectly acceptable, this is not the only option. In fact, since Kubernetes is based on REST, why settle for Go and not use your own favorite language? In this talk, I’ll describe what is an operator, how they work, how to design one, and finally demo a Java-based operator that is as good as a Go one.

Unit testing ensures your production code is relevant. But what does ensure your testing code is relevant? Come discover mutation testing and make sure your never forget another assert again. In the realm of testing, the code coverage metrics is the most often talked about. However, it doesn't mean that the test has been useful or even that an assert has been coded. Mutation testing is a strategy to make sure that the test code is relevant. In this talk, we will explain how Code Coverage is computed, what its inherent flaw is and how Mutation Testing can help us in this regard.

Kotlin is one of those 'new' JVM languages that are currently rocking the boat. Although it’s made a great impact on Android, it’s equally good on the server side. As Domain-Specific Languages are constrained by the language they run on, Kotlin frees developers from Java fluent builders to propose something better. Using the Vaadin web framework as an example, I’ll demo how one could design its own DSL with Kotlin.