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Programmer XiaoFu
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Programmer XiaoFu

xiaofucode.com – a programmer learning guide driven by the pursuit of profit

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Recent Articles

Latest from Programmer XiaoFu

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Programmer XiaoFu
Programmer XiaoFu
Jun 16, 2026 · R&D Management

Why Faster AI Coding Still Leaves Developers More Exhausted

Although AI tools like Copilot and Cursor can cut coding time from five days to three, the saved time is quickly filled with additional tasks, leading to higher output expectations, increased technical debt, and greater mental fatigue for developers, as organizations reap the productivity gains without reducing individual workload.

AI toolsSoftware EngineeringTechnical Debt
0 likes · 8 min read
Why Faster AI Coding Still Leaves Developers More Exhausted
Programmer XiaoFu
Programmer XiaoFu
Jun 15, 2026 · Backend Development

Why a Simple Redis Mutex Lock Isn’t Enough for Cache Breakdown – When to Use Never‑Expire or Logical Expiration

The article analyzes why a basic Redis mutex lock can cause thread blocking, latency spikes, and service collapse under high concurrency, and compares it with logical expiration and never‑expire with proactive updates, explaining their trade‑offs and how to choose the right cache‑breakdown mitigation strategy.

CacheDistributed LockJava
0 likes · 12 min read
Why a Simple Redis Mutex Lock Isn’t Enough for Cache Breakdown – When to Use Never‑Expire or Logical Expiration
Programmer XiaoFu
Programmer XiaoFu
Jun 11, 2026 · Cloud Native

Why Does Feign’s 3‑Second Timeout Actually Take 10 Seconds? The Hidden Role of Ribbon

Feign may be set to a 3‑second timeout, but in Spring Cloud versions before 2020.0 the call is handled by Ribbon, whose default 5‑second read timeout and a single retry to another instance double the wait, producing a consistent 10‑second timeout; the article details this behavior and shows how to configure Ribbon, upgrade Spring Cloud, or use a circuit‑breaker to enforce the intended timeout.

FeignLoad BalancerRibbon
0 likes · 8 min read
Why Does Feign’s 3‑Second Timeout Actually Take 10 Seconds? The Hidden Role of Ribbon
Programmer XiaoFu
Programmer XiaoFu
Jun 8, 2026 · Artificial Intelligence

Why Smart LLMs Still Struggle to Deploy Agents in Production

Although large language models have become more capable, deploying AI agents in production remains difficult because their probabilistic nature leads to error accumulation, testing challenges, fragile real‑world interactions, and a lack of deterministic controls, requiring strict workflows, schema validation, mock testing, and human oversight.

AI agentsLLMhuman-in-the-loop
0 likes · 8 min read
Why Smart LLMs Still Struggle to Deploy Agents in Production
Programmer XiaoFu
Programmer XiaoFu
Jun 1, 2026 · Databases

Why Does an OR Between Two Indexed Columns Still Trigger a Full Table Scan?

Even though the phone and email columns each have a single‑column index, an OR condition forces MySQL's cost‑based optimizer to choose a full table scan because the estimated cost of index merge (random I/O and possible sort‑union) exceeds the cost of a sequential scan, and the article explains the underlying mechanics and practical workarounds.

MySQLOR queryQuery Optimization
0 likes · 10 min read
Why Does an OR Between Two Indexed Columns Still Trigger a Full Table Scan?
Programmer XiaoFu
Programmer XiaoFu
May 27, 2026 · Backend Development

Why Does a ThreadPool Queue Tasks Even When Max Threads Are Idle?

The article explains why Java's ThreadPoolExecutor places tasks into a queue before creating non‑core threads, discusses the cost of thread creation and CPU contention, illustrates the design with a bank‑counter analogy, and shows how Tomcat customizes the queue to prioritize thread creation for low‑latency web workloads.

BlockingQueueJava concurrencyTaskQueue
0 likes · 8 min read
Why Does a ThreadPool Queue Tasks Even When Max Threads Are Idle?