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Docker and Jenkins – Orchestrating Continuous Delivery

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Past week I had the honour of speaking in Docker Barcelona Meetup about how to use Jenkins for doing typical Docker tasks like creating images, publishing them or having a trace of what has occurred on them. Finally I introduced the new (or not so new) Jenkins Pipeline plugin which allows you to create your continuous delivery pipeline by coding ...

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Gartner 2016 Magic Quadrant for Data Warehouse and Database Management Solutions for Analytics

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We are excited to share with you that Gartner has named MapR a Visionary in the Gartner 2016 Magic Quadrant for Data Warehouse and Data Management Solutions for Analytics. Gartner evaluated 21 software vendors on 15 criteria for the quadrant. The MapR Converged Data Platform enables customers to leverage a real-time, reliable analytics platform for global data-driven applications. MAGIC QUADRANT ...

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Tools of the Trade for Performance and Load Testing

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Solve App Problems 10x Faster with AppDynamics – Monitor production apps at code-level depth with minimal overhead. Start a FREE Trial! Your application is fast and scalable, right? How do you know? How often do you run performance or load tests? In this post I will give an overview of the tools of the trade for performance and load testing ...

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@Autowired and optional dependencies

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@Autowired annotation makes our lives easier. It also can result in decreased amount of code if we are using it on properties of the class. We need neither constructors nor setter methods. It looks great at first glance, but the benefits rarely come without cost. Today I want to make you aware of the costs that have to be paid. ...

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Grouping, transforming and reduction with Java 8

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1. Introduction In this previous post, I wrote about how we can group collections of objects with streams and grouping. This is useful but does not cover specific use cases. For example, sometimes we do not only need to group things but also transform the result into a more appropriate object. In this post, we will learn how to apply ...

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Kubernetes Namespaces, Resource Quota, and Limits for QoS in Cluster

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By default, all resources in Kubernetes cluster are created in a default namespace. A pod will run with unbounded CPU and memory requests/limits. A Kubernetes namespace allows to partition created resources into a logically named group. Each namespace provides: a unique scope for resources to avoid name collisions policiesto ensure appropriate authority to trusted users ability to specify constraints for resource consumption This ...

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Kotlin Month Post 2: Inheritance and Defaults

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Intro Continuing on with Kotlin Month, this week, I’ll be discussing topics in Kotlin that have to do with inheritance and default values. Composition Over Inheritance Kotlin has put in a feature and a couple defaults that help developers keep the principle of Composition Over Inheritance at the forefront of their mind. The first of these is a feature that ...

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SQL: Counting Groups of Rows Sharing Common Column Values

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In this post, I focus on using simple SQL SELECT statements to count the number of rows in a table meeting a particular condition with the results grouped by a certain column of the table. These are all basic SQL concepts, but mixing them allows for different and useful representations of data stored in a relational database. The specific aspects ...

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Iterate over all keys in a Redis Cluster

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Redis provides a neat command to iterate over all keys on a node. It’s the SCAN command that is used to scan over keys and to return a cursor to resume then the scanning from the cursor position. Complexity comes in when using Redis Cluster. In the previous scenario, all keys are located on one Redis node. With Redis Cluster ...

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12 Awesome Spring Data Tutorials to Kick-Start your Data Projects

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Spring Data’s mission is to provide a familiar and consistent, Spring-based programming model for data access while still retaining the special traits of the underlying data store. It makes it easy to use data access technologies, relational and non-relational databases, map-reduce frameworks, and cloud-based data services. This is an umbrella project which contains many subprojects that are specific to a ...

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