はてなブックマーク

Machine learning (ML) now impacts a wide swath of business, engineering, and research domains, to the extent where you’d be hard-pressed to find a niche where machine learning is totally uninvolved. Progress in ML has come on the coattails of broader trends in software and automation: Wherever human activity depends on doing repetitive tasks that can be readily described in a way that a computer c

In today’s ever-evolving digital world, having a functional and powerful mobile app has become mandatory for businesses of all shapes and sizes. Choosing the right technology framework is vital for building a successful mobile application, be it iOS or Android. The purpose of this post is to help you identify the right cross-platform app development framework by comparing important factors like pe

Node.js backend development has become extremely popular among software developers. In order to keep up with modern technologies, it is necessary to know what is Node.js, what are the reasons to use it, where to hire developers, etc. Answers to these questions will be discovered in this article. Node.js back-end development is nothing new and you can find its implementation in many products like N

when practicing continuous delivery, it is nessesary sometimes to safely migrate one's database to another database without downtime. the question is how to do it safely with minimum disruption to production. at wix.com we do database migrations several times a year (on different products) with much success. you can use this pattern to migrate between two different databases, for instance between

Kotlin coroutines are much more than just lightweight threads — they are a new paradigm that helps developers to deal with concurrency in a structured and idiomatic way. When developing an Android app, one should consider many different things: taking long-running operations off the UI thread, handling lifecycle events, canceling subscriptions, switching back to the UI thread to update the user in

In this post, we'll define a Kubernetes Custom Resource Definition (CRD) and then write a controller (or operator) to manage it — all in 60 lines of Rust code. Over the last several months, I have been writing more and more Kubernetes-specific code in Rust. Even though Kubernetes itself was written in Go, I am finding that I can typically write more concise, readable, and stable Kubernetes code in

Reliability is key to a microservices architecture. Circuit breakers are a design pattern to create resilient microservices by limiting the impact of service failures and latencies. One of the primary goals of the Circuit Breaker pattern is to handle failures gracefully so that no cascading failures occur. In a microservice landscape, failing fast is critical. Circuit breakers do a great job of pr

With the rapidly changing business and technology landscape of today, developers, data scientists, and IT operations are working together to build intelligent applications with new technologies and dynamic architectures because of the flexibility, speed of delivery, and maintainability that they make possible. This post will go over the technologies that are facilitating evolutionary architectures

If you are a Java developer and looking for some awesome resources, e.g. books and courses, to improve your multithreading and concurrency skills in Java, then you have come to the right place! In the past, I have shared books and tutorials on Java concurrency and multithreading, and in this article, I am going to talk about some of the best free and paid courses to learn multithreading and concur

We will be writing an Angular 2 app that uses JWT for authentication. Grab the Github repo if you would like to follow along. The rise of single page applications (SPAs) and decoupling of the front-end from the back-end is in full force. Frameworks like Angular, React, and Vue allow developers to build bigger, better, and more performant single page applications than ever before. Token-based authe

A lot of articles address the role of tech leads and engineering managers. One common theme we often come across is how to increase a team’s productivity. But before you focus your energy trying to increase their productivity, you might first want to consider what’s destroying it, to have a sound base on which you can build. Unfortunately, even though Peopleware was published almost 30 years ago,

I must admit that this post is just an excuse to play with Grafana and InfluxDB. InfluxDB is a cool database specifically designed to work with time series data. Grafana is one open source tool used for time series analytics. I want to build a simple prototype. The idea is: One Arduino device (ESP32) emits an MQTT event to a Mosquitto server. I’ll use a potentiometer to emulate one sensor. For exa

JDK 11 is scheduled to be released for general availability on Tuesday, 25 September 2018. A 16 August 2018 Mark Reinhold message on the OpenJDK jdk-dev mailing list announced that "JDK 11 is now in the Release Candidate Phase." However, Reinhold provided updated details in a 17 August 2018 message on that same mailing list in which he stated, "We tagged the first Release Candidate build this morn

Choosing a tech stack sometimes becomes a tedious task as you need to take every factor into consideration, including budget, time, app size, end-users, project objectives, and resources. Whether you are a beginner, a developer, a freelancer, or a project architect forming strategies, it is a wise decision to be aware of the advantages and drawbacks of each framework in detail. So, this post will

According to the Scrum Guide, Product Backlog refinement is the act of adding detail, estimates, and order to items in the Product Backlog. But Scrum doesn't prescribe how you do it, and for good reason. Refinement is an ongoing process. It never stops because requirements and opportunities never stop changing. Detailing everything up front would create waste and also delay the delivery of value.

I often receive emails from my readers about how they can become a better Java developer, what things they should learn, and which area they can work on to become a rockstar Java developer. After answering them individually over the last few years, I thought to jot down a couple of points that I think will make you a better Java programmer and application developer. If you haven't read them yet, y

Don't forget to bookmark this article for quick reference when you need it! To illustrate the different query types in Elasticsearch, we will be searching a collection of book documents with the following fields: title, authors, summary, release date, and number of reviews. But first, let’s create a new index and index some documents using the bulk API: PUT /bookdb_index { "settings": { "number_of

Reading compiled Java bytecode can be tedious, even for experienced Java developers. Why do we need to know about such low-level stuff in the first place? Here is a simple scenario that happened to me last week: I had made some code changes on my machine a long time ago, compiled a JAR, and deployed it on a server to test a potential fix for a performance issue. Unfortunately, the code was never c

For over three years, Project Valhalla has been a buzzword in the Java community, but even with all of this anticipation and foreboding, surprisingly little has been published on this important project. For some, it means the ability to create value types, and for others, it means reified generic runtime types. But through all of the confusion and desire, Project Valhalla has a very specific purpo

CONTACT US 600 Park Offices Drive Suite 150 Research Triangle Park, NC 27709 [email protected] +1 (919) 678-0300

Refcards Trend Reports Events Over 2 million developers have joined DZone. Join Today! Thanks for visiting DZone today,

Recently the team of which I'm a member faced an issue with deploying our microservices (Java+SpringMVC in Docker on AWS). The main problem was, that our pretty lightweight application consumed too much memory. As a result, we figured out many tricky moments about Java in Docker regarding memory and found the way to decrease its consumption via refactoring and migration to Spring Boot. The results

The content of this article was originally written by Tae Jin Gu on the Cubrid blog. When there is an obstacle, or when a Java based Web application is running much slower than expected, we need to use thread dumps. If thread dumps feel like very complicated to you, this article may help you very much. Here I will explain what threads are in Java, their types, how they are created, how to manage t

The Problem: Confusion, Uncertainty, and Delays We find this a common thread amongst our customer teams, which can be attributed to a lack of backlog refinement. A team is planning their next sprint.  One of the developers looks anxious: “What do you mean we are changing the way we list items? This is going to be messy – does finance know? Well fine, we can do it, but it’s not on me when we have t

Kafka Apache Kafka is a high performing message middleware that allows the implementation of real-time, batch, and stream type of message processing. Apache Kafka is used by many corporations for their web scale needs. This article explains how to create Kafka clients using the 0.9.0 version of the Kafka API. We'll also show various ways Kafka clients can be created for at-most-once, at-least-once

I've recently been involved with several Scrum Teams that are struggling to have the right level of detail in their Product Backlog items.| Some symptoms: difficulty during Sprint Planning sessions, a massive or very small Product Backlog, or a lack of understanding during a Sprint. All of the teams I spoke with had refinement activities in place. It is important to note that Product Backlog refin