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Direct Caching of Page Results The most straightforward approach to caching paginated data involves storing the complete result set for a specific page query. The cache key is typically constructed using the query parameters and pagination metadata. public List<Item> fetchItemList(String filter, int pageNum, int pageSize) { String ca ...

Echo Technology First Round Kafka Multiple Partitions Ensuring Message Order Initially sending messages can be achieved by specifying key + single partition When multiple consumers process data, you can take modulo of the key and place it into queues, then use multiple threads to consume these queues. Queues maintain internal order MySQL W ...

Redis High Availability High availability in web servers refers to the time during which a service remains accessible, typically measured by uptime percentages (99.9%, 99.99%, 99.999%). In the Redis context, high availability encompasses more than just service availability—it also involves data capacity scaling, data durability, and rapid disas ...

This guide demonstrates hands-on Redis usage in Java applications, covering direct client interaction via Jedis, configuration best practices, and seamless integration with Spring Boot using both Jedis and Lettuce clients. Command-Line Interaction Before integrating into code, verify Redis connectivity using the CLI: redis-cli -h 192.168.100.11 ...

Introduction to Object Pooling In software architecture, managing resources that require significant time to instantiate or terminate is a critical optimization challenge. Techniques known as pooling address this by maintaining a collection of reusable instances, thereby mitigating system overhead and enhancing throughput. Common applications i ...

Redis Transactions Redis transactions enable the execution of multiple commands as a single atomic operation. Commands are queued and executed sequentially without interruption. MULTI SET user:name "alice" INCR user:visits GET user:name EXEC Transaction Behavior Syntax errors during queueing abort the entire transaction. Runtime err ...

Single-System Locks In single-system architectures, locks like ReentrantLock are effective for controlling concurrent access within a single JVM. However, when multiple instances of an application are running behind a load balancer, these locks become ineffective as each instance operates independently. Testing with JMeter to simulate high co ...

Product Homepage View The product homepage displays categories, promotional banners, advertisements, and category-specific product listings. The backend must provide the following data to the frontend: All product category information Banner carousel data Promotional advertisement details Categorry display titles and images User shopping cart ...

Understanding Distributed Scrapy LimitationsStandard Scrapy lacks native distributed capabilities for two primary reasons:Each Scrapy instance operates with its own scheduler, preventing URL distribution across multiple machines (no shared scheduler)Crawled data cannot be processed through a unified pipeline for centralized storage (no shared p ...

NoSQL Overview NoSQL Use Cases Traditional relational databases face limitations with modern web-scale applications: Single-machine MySQL systems struggle with large datasets exceeding storage capacity Index sizes can surpass available memory resources Read/write workloads overwhelm single-server capabilities Caching solutions like Memcached ...