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>今天面试了一个半吊子Java后端,真无语😭
今天面试了一个半吊子Java后端,真无语😭
2025-12-04 11:51:52
今天面试了一个半吊子Java后端,真无语😭
来面试的男生简历写着 “精通高并发与分布式架构”,结果几道基础题下来直接原形毕露。
🚩 窒息面试问答实录
🎗 问:ThreadLocal 的使用场景是什么?何种情况下会发生内存泄漏?
他答:“就是每个线程单独拥有的变量… 泄漏?应该不会吧,有垃圾回收机制啊。”
❗ 专业深度拆解
核心本质:ThreadLocal 会为每个线程创建独立的变量副本,其中 key 采用弱引用设计,但 value 属于强引用类型泄漏场景:当线程池复用线程时,ThreadLocalMap 中的 value 未被主动清除,导致资源无法释放解决方案:必须手动调用 remove () 方法清理,或用 try-finally 代码块包裹使用逻辑,确保资源回收
🎗 问:ConcurrentHashMap 是如何保障线程安全的?1.7 与 1.8 版本有哪些核心差异?
他迟疑:“用了 synchronized 吗?1.8 版本… 好像调整了锁的粒度?”
❗ 底层实现真相
1.7 版本:采用分段锁机制(Segment + ReentrantLock),按段划分锁范围1.8 版本:优化为 synchronized + CAS 机制,搭配链表转红黑树的结构升级关键细节:仅对链表头节点加锁,扩容过程支持并发数据迁移,提升执行效率
🎗 问:线上服务出现 OOM 异常,该如何快速定位问题根源?
他一脸茫然:“看看日志… 重启服务试试?”
❗ 应急排查四板斧
1. 执行 jmap -dump:live,format=b,file=heap.bin <pid> 抓取堆内存快照 2. 通过 jstat -gcutil <pid> 监控 GC 运行状态,排查异常情况 3. 借助 Arthas 的 memory 命令,实时监测堆内存使用动态 4. 用 MAT 工具分析 dominator_tree,定位疑似内存泄漏的对象
🎗 问:MySQL 发生死锁时,该怎么排查和处理?
他猜测:“等超时自动释放… 或者直接 kill 掉相关线程?”
❗ 排查处理连环招
紧急排查:立即执行 show engine innodb status\\G 命令,查看 LATEST DETECTED DEADLOCK 详情预防方案: 1. 事务中按固定顺序访问数据表,避免交叉锁竞争 2. 优化索引设计,缩小锁的作用范围 3. 配置 innodb_lock_wait_timeout 参数,合理控制锁等待超时时间
💡 血泪经验总结
简历踩雷行为:
1. 标注 “精通微服务”,却无法说清服务治理的核心流程
2. 项目经验写 “支撑 QPS 10 万”,却画不出完整的系统架构图面试必杀拷问:
3. “你会如何设计一个能支撑高并发秒杀的系统?
#程序员
#后端开发
#Java面试
#互联网大厂
#Java后端
#后端开发面试
#面经
#计算机
#空窗期面试
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CONNECT:[ UseTime:0.000905s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001274s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000560s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.008197s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.001540s ]
SELECT * FROM `set` [ RunTime:0.004240s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.001637s ]
SELECT * FROM `article` WHERE `id` = 457309 LIMIT 1 [ RunTime:0.002805s ]
UPDATE `article` SET `lasttime` = 1765115083 WHERE `id` = 457309 [ RunTime:0.006542s ]
SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001311s ]
SELECT * FROM `article` WHERE `id` < 457309 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004897s ]
SELECT * FROM `article` WHERE `id` > 457309 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001160s ]
SELECT * FROM `article` WHERE `id` < 457309 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002064s ]
SELECT * FROM `article` WHERE `id` < 457309 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002709s ]
SELECT * FROM `article` WHERE `id` < 457309 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002038s ]
0.205134s