sync.Mutex // Mutex provides mutual exclusion for shared resources. type Mutex struct { state int32 // State of the mutex (locked/unlocked) sema uint32 // Semaphore for blocking goroutines } // Lock acquires the mutex, blocking if necessary. func (m *Mutex) Lock() { // Check if already locked; if so, block until unlocked. } // Unlock releases the mutex. func (m *Mutex) Unlock() { // Update state and unblock waiting goroutines if any....
direct-to-storage architecture architecture with Kafka as intermediate buffer What is Jaeger? Jaeger is an open-source, end-to-end distributed tracing system. It helps monitor and troubleshoot transactions in complex, microservices-based architectures. What problem does distributed tracing solve? Distributed tracing helps in understanding the flow of requests through a distributed system, identifying performance bottlenecks, and diagnosing issues in microservices architectures. What are the main components of Jaeger? The main components of Jaeger are:...
What are the main MySQL storage engines and their differences? MySQL supports multiple storage engines, each with distinct characteristics: InnoDB: Default engine since MySQL 5.5 Supports ACID transactions Provides row-level locking Supports foreign keys and relationship constraints Uses clustered indexes MyISAM: Older engine, used as default before MySQL 5.5 Non-transactional Table-level locking Faster for read-heavy operations Supports full-text indexing Memory (HEAP): Stores data in RAM for fast access Non-persistent (data lost on restart) Useful for temporary tables and caches Archive:...
Input Tables INNER JOIN INNER JOIN returns only the rows where there’s a match between both tables based on the join condition. SELECT A.ID, A.Name, B.ID, B.Department FROM A INNER JOIN B ON A.ID = B.ID LEFT JOIN LEFT JOIN returns all rows from the left table (A), and the matched rows from the right table (B). If there’s no match, NULL values are used for the right table columns....
What is Prometheus? Prometheus is an open-source systems monitoring and alerting toolkit. It collects and stores metrics as time series data, allowing for flexible querying and real-time alerting. What are the main components of Prometheus? The main components of Prometheus are: Prometheus server (for scraping and storing time series data) Client libraries (for instrumenting application code) Push gateway (for supporting short-lived jobs) Exporters (for services that don’t expose Prometheus metrics directly) Alertmanager (for handling alerts) How does Prometheus collect metrics?...
Protocol Buffers 1. Introduction Protocol Buffers (Protobuf) is a language-agnostic, platform-neutral extensible mechanism for serializing structured data. Developed by Google, it aims to be faster, smaller, and simpler than XML. This report provides an in-depth analysis of Protobuf’s principles, performance characteristics, and practical implications. 2. Historical Context and Development Origin: Developed internally at Google in the early 2000s. Open Source Release: Made publicly available in 2008. Versions: Proto1: Initial release (deprecated) Proto2: Introduced optional and required fields Proto3: Simplified syntax, removed required fields 3....
A comprehensive guide to troubleshooting Redis performance issues 1. Introduction Redis is renowned for its high performance, capable of handling 100,000 operations per second. However, users may encounter unexpected latency issues in various scenarios: Same commands sometimes fast, sometimes slow Simple operations like SET and DEL taking unexpectedly long Temporary slowdowns that resolve themselves Sudden performance degradation after long periods of stability This comprehensive guide (approximately 20,000 words) aims to provide a thorough troubleshooting approach for Redis performance issues....
1. 小作文 对所看到的数据、信息进行客观、准确、全面的描述。 1.1. 小作文图表分类 Line graph Bar chart Pie chart Table 1.2. 图表类小作文中的图表特征 静态图 时间点小于等于1 difference 动态图 时间点大于2 change 数据 最大值 最小值 等值 差值 倍数 大于 小于 趋势，动态图使用 上升 下降 波动 不变 程度大小 剧烈 平缓 1.3. 图表类小作文的段落组成 改写段 复述图表介绍 概述段 宏观概述 2～3句话 常见：2～3个要点 少数：1个要点 细节段 描述重要细节 4～5句话 细节段 描述重要细节 4～5句话 1.4. 图表类小作文改写段的写作 改写 描述性词汇同义替换 换位置 概括 1.5. 图表类小作文概述及细节内容的抓取 概述性：看型 看例子1 看例子2 细节性：对数 看例子1 1.6. 图表类小作文概述段的写作 Overview概述段的句子数量 折线图Overview概述段举例 概述段的引导词 Overall、In sum…...
【图表类小作文补充表达】 【表达：程度】 程度 逐渐的 slightly modestly gradually 稳定的 steadily sustained 显著的 noticeably remarkably markedly 巨大的 significantly remarkably dramatically rapidly sharply 大量的/少量的 a great/signifcant/major proportion (of…) (only) a fraction (of…) 最大量/少量 greatest/most significant proportion (of…) smallest/least significant proportion (of…) 以不同的程度 to different/varying degrees 【表达：分别的】 分别的 respectively each 【表达：年龄】 year old years old people of 18-24 years old year old 18-24 year old people aged people aged 18-24 year olds 18-24 year olds...
Stretching pectoralis major and pectoralis minor Stretching the anterior shoulder girdle External rotation with internal rotation of the shoulder joint Internal rotation with external rotation of the shoulder joint Assisted Humeral Push-Up and Lateral Raise