Category: Redis

Feed: Redis Labs. Author: Madhukar Kumar. Development teams building online and operational applications increasingly choose a new class of databases to support them. It’s called “NoSQL,” or “Not Only SQL”, and includes options such as Redis, MongoDB and others. Selecting the right database from among the available NoSQL solutions is one of the most important decisions you can make when designing a new application. So, if you are evaluating NoSQL databases, read on for some recommendations that will aid in your selection. When choosing your database, there are five high-level steps you should follow: Define the goals for your NoSQL ... Read More

Feed: Redis Labs. Author: Chris Cheung. What is a key anyway in Redis? The original intention of Redis (or any key-value store) was to have a particular key, or identifier, for each individual piece of data. Redis quickly stretched this concept with data types, where a single key could refer to multiple (even millions of) pieces of data. As modules came to the ecosystem, the idea of a key was stretched even further because a single piece of data could now span multiple keys (for a RediSearch index, as example). So, when asked if Redis is a key-value store, I ... Read More

Feed: Redis Labs. Author: Kyle Davis. Transactions in any database are intimidating. It requires a level of understanding beyond just what is stored, but also when it is stored. Unlike the happy world that results when countless layers of abstraction can shield you from complexity, transactions require you to go deeper. Redis is not unusual in this regard. In fact, its entirely different way of thinking about transactions causes a lot of people to say it doesn’t have transactions at all. Redis has them, just with an approach that’s totally different from the rollbacks you’ve probably grown up with. To ... Read More

Feed: Redis Labs. Author: Roshan Kumar. Recently, I had the honor of presenting my talk, “Redis + Structured Streaming: A Perfect Combination to Scale-out Your Continuous Applications” at the Spark+AI Summit. My interest in this topic was fueled by new features introduced in Apache Spark and Redis over the last couple months. Based on my previous use of Apache Spark, I appreciate how elegantly it runs batch processes, and the introduction of Structured Streaming in version 2.0 is further progress in that direction. Redis, meanwhile, recently announced its new data structure, called “Streams,” for managing streaming data. Redis Streams offers ... Read More

Feed: Redis Labs. Author: Kyle Banker. Summer is a great time for relaxing, unwinding, and picking up a good book. And, personally, I always try to learn something new. But I’ve found it has to be manageable! I admit to failing miserably the summer I tried taking on even the abridged version of Edward Gibbon’s masterpiece on the Roman Empire. I had a lot more success several summers later when I read (and did) The Little Scheme, a slim volume you might consider the unofficial “gateway drug” to functional programming. In the interest of providing you with a manageable yet ... Read More

Feed: Redis Labs. Author: Loris Cro. Instagram recently published a post on their engineering blog about the concept of promisifying cached values. The idea is that, on a cache miss, it takes a while to fetch the missing value, which could cause stampedes on the underlying DBMS that the cache is supposed to protect. A stampede consists of multiple parallel requests that, on a cache miss, trigger multiple instances of the same work to populate the cache (see below) In their post, Instagram’s Nick Cooper showcases the idea of storing a dummy value (i.e. the promise) in the cache to ... Read More

Feed: Redis Labs. Author: Kyle Davis. The Helicoprion is a now extinct but strange animal that roamed the seas of the early Permian. It looks more or less similar in both size and shape to a contemporary Great White Shark. Most likely, it was a formidable predatory of the seas. The thing that set it apart was that it had a “Tooth-whorl,” which is somewhat akin to having a shark teeth circular saw located inside the lower jaw. Seems like it would be a good idea, but evolution had a different idea and we don’t have any existent animals like ... Read More

Feed: Redis Labs. Author: Loris Cro. Let’s talk about communication tools and patterns. With the introduction of Streams in Redis, we now have another communication pattern to consider in addition to Redis Pub/Sub and other tools like Kafka and RabbitMQ. In this article, I will guide you through the defining characteristics of various communication patterns, and I’ll briefly introduce the most popular tools used to implement each. Finally, I’ll leave you with a small take-away that will hopefully help you build better solutions faster. Synchronous Communication In this context, synchronous means that all parties need to be active at the ... Read More

Feed: Redis Labs. Author: Madhukar Kumar. Last week, we released RedisGraph 1.2.0. If you’ve been using RedisGraph or considering trying out the module, this is a good time to see what we’ve been up to as we continue to enhance its graph processing capabilities. Let’s review some of the more notable additions in the new release: Multiple edges of the same type Up until this release, connecting node A to node B via an edge of type R and then forming another connection of the same type between the two was not possible. as the latter would overwrite the former ... Read More

Feed: Redis Labs. Author: Preston Reyes. At RedisConf19, I demoed a solution for running full-text RediSearch over nodes in RedisGraph. The days leading up to the event are a bit of a fog, but now, a few weeks later, I realized we should explain more about how we did this and release the source code. In this demo, I showed a little interface that allows you to search for animals and see how they are related via the biological classification system (kingdom, phylum, class, order and so on). The full-text portion was based on the first English paragraph from wikipedia ... Read More