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Tag Archives: Redis

NoSql Databases: Cassandra vs Mongo vs Redis DB Comparison

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1. What are NoSql Databases? NoSql (Not only Sql) databases are non-relational databases that are horizontally scalable, persist semi or unstructured data and have flexible schemas. These databases support multiple data models such as key-value, document, column-family, graph based, in-memory etc. for managing and accessing data. NoSql databases are best suited for building modern applications, which require large data and ...

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Spring Data Redis: High-Availability with Sentinel

1. Overview For high-availability with Redis, we can use Spring Data Redis’ support for Redis Sentinel. With Sentinel, we can create a Redis deployment that automatically resists certain failures. Redis Sentinel also provides other collateral tasks such as monitoring, notifications and acts as a configuration provider for clients. At a high level, Sentinel’s capabilities are: Automated failover. When a master ...

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A first look at Redis Streams and how to use them with Java

Redis Streams have made it into Redis’ unstable branch since the beginning of this year, and the first clients start with the adoption of Redis Streams APIs. That makes it an excellent time to take a look what Redis Streams provide and how you can use them from a client perspective. Disclaimer: Redis Streams are available as a first draft ...

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Intro to Redis with Spring Boot

1. Overview In this article, we will review the basics of how to use Redis with Spring Boot through the Spring Data Redis library. We will build an application that demonstrates how to perform CRUD operations Redis through a web interface. The full source code for this project is available on Github. 2. What is Redis? Redis is an open ...

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Redis Client Lettuce 5 GA released

After a 13 months development phase and 208 solved tickets, it is my pleasure to announce general availability of Lettuce 5.0. This is a major release coming with several breaking changes and new interesting features and Java 9 compatibility. Get the release from Maven Central <dependency> <groupId>io.lettuce</groupId> <artifactId>lettuce-core</artifactId> <version>5.0.0.RELEASE</version> </dependency> or download the release bundle from GitHub. Lettuce 5 introduces ...

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Command Interfaces: Approaching Redis with dynamic APIs in Java

Redis is a data store supporting over 190 documented commands and over 450 command permutations. The community supports actively Redis development; each major Redis release comes with new commands. This year Redis was opened up for 3rd party vendors to develop modules that extend Redis functionality. Command growth and keeping track with upcoming modules are challenging for client developers and ...

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Elixir ETS Versus Redis

Learning Elixir has a way of challenging everything you know about programming. Redis is becoming an assumed part of many web stacks, in the same breath as your database. But with Elixir, do you need it? Do you even need a database? The Changing World of Web Application Operation Here’s the standard mode of operation for a web application these ...

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Iterate over all keys in a Redis Cluster

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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Redis transactions

Redis transactions allow to group multiple commands and to execute them sequentially. The whole transactional state is isolated from other users and becomes visible once a transaction is committed. A Redis transaction is different from transactions in, let’s say, relational databases. A Redis transaction feels more like a queue/stack of commands because commands are queued and the execution is deferred. ...

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