Su San, former staff at several leading tech companies, is a top creator on Juejin and a premium creator on CSDN, and runs the free coding practice site www.susan.net.cn.
This guide shows backend engineers and ops teams how to efficiently inspect large production logs using Linux utilities such as tail, less, grep, sed, and awk, with concrete command examples for service start‑up monitoring, bug reproduction, trace‑ID tracing, error context extraction, and statistical analysis.
Facing frequent timeouts in the high‑traffic eLong red‑envelope API, we traced the root cause to a RabbitMQ SDK connection‑leak using Linux netstat, then resolved it by offloading the processing to a single‑threaded pool, eliminating blocking and avoiding the SDK bug.
This article walks through the One Billion Row Challenge—parsing a 13 GB file of 1 billion temperature records—by examining the baseline Java solution, analyzing top contestants' results, and detailing a step‑by‑step series of low‑level optimizations (JVM choice, parallel I/O, custom parsing, bespoke hash tables, Unsafe and SWAR techniques) that shrink execution time from minutes to under two seconds.
This article presents ten powerful SQL techniques—including CTEs, recursive CTEs, temporary functions, CASE‑WHEN pivots, EXCEPT vs NOT IN, self‑joins, ranking functions, delta calculations, cumulative sums, and datetime manipulation—complete with explanations and runnable code examples for data analysts and engineers.
This guide walks you through RedisInsight—a visual Redis GUI that supports clusters, SSL/TLS, and memory analysis—covering Linux installation, environment variable setup, service startup, Kubernetes deployment via YAML, and core usage such as browsing keys, executing commands, and monitoring performance.
JetBrains quickly reverted the 2025.3 redesign of DataGrip’s SQL workflow, restoring the original Query Console as the default, and provides clear migration steps for users to delete, convert, or temporarily keep Query Files while outlining the impact and future plans.
This guide walks you through practical techniques for quickly locating Java NullPointerException traces in plain, rotating, and compressed log files using grep, tail, less, and related options, covering context display, real‑time monitoring, compressed‑log searching, and occurrence counting.
This guide compares Elasticsearch’s four common pagination techniques—`from/size`, `search_after`, Scroll API, and Point in Time—detailing their syntax, advantages, drawbacks, and ideal use‑cases, helping developers select the most efficient method based on pagination depth, consistency requirements, and resource constraints.
IntelliJ IDEA 2025.3 merges Ultimate and Community editions into a single installer, unlocks many formerly premium features for free users, adds command completion, full Java 25 support, a new Islands theme, AI enhancements, expanded framework integrations, and a suite of productivity plugins for modern development workflows.
This guide explains why sensitive configuration and user data must be encrypted in Spring Boot projects, demonstrates how to use Jasypt for property‑level encryption and custom AOP‑based field masking, and dives into the underlying PBE algorithm and source‑code mechanics.
