阿里基础面(饿了么)

1. G1算法(和cms区别)：

https://www.jianshu.com/p/671ab8535d82

2、系统频繁full GC如何排查

https://www.jianshu.com/p/434120549ebb

3、讲讲java的并发

4、sy实现系统一点，轻量级锁是什么锁？讲实际的东西，偏向锁

https://www.jianshu.com/p/7c5e28d839bb

5、核心线程池20，基础线程池200，工作队列2000，拒绝策略的参数5000，qps从1线性涨到5000，用的arrayblockingquene.如何建这样的线程池?

arrayblockingquene：https://www.jianshu.com/p/3c2e0671a7a3

https://www.jianshu.com/p/bc9005ad40c9

6.NIO,讲一下channel

https://www.jianshu.com/p/a869c406e0ce

7.零拷贝

https://www.jianshu.com/p/81ca0d45d57f

8.java锁，可重入锁

https://www.jianshu.com/p/8403206e8e8d

9.spring用的多嘛，springboot启动过程

https://www.jianshu.com/p/0b05e01fc12b

10.分布式事务，两阶段和三阶段区别

https://www.jianshu.com/p/03da377fe115

https://www.jianshu.com/p/abe669d72db9

https://www.jianshu.com/p/24fafe4127c7

11.联合索引怎么工作？

https://www.jianshu.com/p/39c489ac8713

（有问题）https://www.jianshu.com/p/3b0532d215b5

12.主键索引和唯一索引区别

https://www.jianshu.com/p/195c77ee7f93