Freaks City

Redis (REmote Dicsionary Service) is an open-source, in-memory data structure store used as a database, cache, and message broker. Unlike traditional databases, Redis stores data primarily in memory, enabling extremely high throughput (often exceeding 100,000 operations per second) and low latency access. While it is commonly recognized for its ...

Delayed tasks are common in real-world applications, such as canceling orders after payment timeout or automatically confirming deliveries. This article analyzes 11 different ways to implement delayed tasks, from implementation to underlying principles. Each approach has its own strengths and suits different scenarios. DelayQueue DelayQueue is ...

Stateless Authentication with RedisIn a distributed architecture, relying on Tomcat's local sessions for user state leads to inconsistencies across instances. Redis serves as a centralized session store to solve this. When a user logs in via SMS, a unique token is generated and stored in Redis as the key, with the serialized user DTO as the val ...

Implemanting Backend CAPTCHA Validation with ASP.NET Core and Vue.js While client-side CAPTCHA logic can be implemented, it often presents security concerns. A more robust approach involves generating and validating CAPTCHA codes on the server side. This method is essential for applications deployed in intranet environments where third-party se ...

In the previous article, we explored Spring Boot integration with Redis. This article focuses on implementing Redis caching in MyBatis operations. We'll examine four key annotations: @CachePut, @Cacheable, @CacheEvict, and @CacheConfig. Fundamentals @Cacheable The @Cacheable annotation configures method-level caching, storing results based on m ...

Deploying the Zabbix Monitoring Agent Establish the required directory hierarchy within the Salt base environment to separate system initialization tasks from application-specific configurations. mkdir -p /srv/salt/base/{init/zabbix_epel,zabbix_agent/templates} Configure the EPEL repository to ensure dependency resolution works correctly. Dow ...

1. MySQL 4. Elasticsearch docker run -d --name=es -p 9200:9200 -p 9300:9300 -e discovery.type=single-node -e ES_JAVA_OPTS="-Xms256m -Xmx512m" -v /es/config/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml -v /es/data:/usr/share/elasticsearch/data -v /es/plugins:/usr/share/elasticsearch/plugins ela ...

Redis cluster addresses storage limitations by distributing data across multiple master-slave node groups. Unlike sentinel mode, where all nodes store complete datasets, cluster mode partitions data to reduce individual node pressure. Data Partitioning Strategies Hash Modulo Approach This method applies a hash function to keys and uses modulo o ...

Microservices Architecture Stack Modern distributed systems leverage Spring Cloud Alibaba ecosystem combined with containerized deployement. Core infrastructure components include Nginx for edge traffic management, Spring Cloud Gateway for centralized authentication and routing, Nacos for service discovery and dynamic configuration, Sentinel fo ...

Cache Penetration Cache penetration occurs when a large number of requests target data that exists neither in the cache nor in the database. For example, if users repeatedly request non-existent order numbers like -1, these requests bypass the cache entirely and hit the database directly. This scenario can be exploited maliciously to overwhelm ...