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Java后端面试,这些问题一定要准备!
2025-12-07 14:44:32
Java后端面试,这些问题一定要准备!
找工作或者跳槽的一定要记背场景题,现在市场问场景题占比非常高,所以场景题也有对应答案,希望对你们面试有帮助。
👉 场景一:10万QPS秒杀防超卖
- 问:双十一秒杀瞬时10万QPS,如何防超卖、稳服务?
- 答:三层削峰+原子控制——Nginx网关限流(每秒放1万请求);Redis预存库存,Lua脚本原子扣减,成功请求Kafka异步下单;数据库订单号唯一索引防重复。核心:快速失败、异步解耦。
👉 场景二:分布式事务一致性
- 问:订单支付联动库存、积分,如何保证跨服务数据一致?
- 答:按需求选方案——强一致性(支付)用TCC(Try冻结、Confirm执行、Cancel回滚);最终一致性(物流)用SAGA+事务消息,失败触发补偿。核心:异步解耦,避免同步调用。
👉 场景三:缓存穿透与雪崩应对
- 问:无效ID查询压垮数据库,或缓存集中过期引发雪崩,怎么解?
- 答:①穿透:前端校验+网关布隆过滤器+缓存空值30秒短过期;②雪崩:热点数据永不过期+多级缓存(本地→Redis→DB),非热点加随机过期时间,Redis主从+哨兵保障可用。
👉 场景四:数据库连接池耗尽排查
- 问:线上报错“连接池耗尽”,如何快速恢复+根治?
- 答:先止血——Prometheus看QPS、SkyWalking追慢SQL、Grafana析连接数;慢SQL则kill+优化索引,QPS突增则K8s HPA扩容。再根治——Druid连接池监控告警,优化参数,防连接泄露与恶意SQL。
🔥 完整版PDF含12个高频场景(分布式锁、限流熔断等),覆盖80%考点。
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CONNECT:[ UseTime:0.000966s ] mysql:host=127.0.0.1;port=3306;dbname=g_mffb;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001521s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002431s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006184s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.001516s ]
SELECT * FROM `set` [ RunTime:0.000993s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.001829s ]
SELECT * FROM `article` WHERE `id` = 456958 LIMIT 1 [ RunTime:0.001453s ]
UPDATE `article` SET `lasttime` = 1765168241 WHERE `id` = 456958 [ RunTime:0.008603s ]
SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000661s ]
SELECT * FROM `article` WHERE `id` < 456958 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000976s ]
SELECT * FROM `article` WHERE `id` > 456958 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002836s ]
SELECT * FROM `article` WHERE `id` < 456958 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004540s ]
SELECT * FROM `article` WHERE `id` < 456958 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002207s ]
SELECT * FROM `article` WHERE `id` < 456958 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010443s ]
0.211535s