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update 1130 #1

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@qxlx qxlx commented Nov 30, 2023

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qxlx commented Nov 30, 2023

1130 整理线程池部分，两道算法题

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qxlx commented Dec 1, 2023

linux top、vmstat、pidstat、jstat、jstack、jmap

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qxlx commented Dec 1, 2023

重复消费的场景
1.幂等的基本概念
2.producer幂等 ，pid,partion,seqnumb 会话幂等
幂等型Producer 可以保证回话级别的，但是重启失败就会丢失
事务性prodcer 可以保证跨会话跨分区。
3.consumer幂等
1.落记录判断 setnx 2.判断处理状态

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qxlx commented Dec 1, 2023

top
top -Hp pid 查看具体线程使用系统资源情况：
vmstat 上下文交换

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qxlx commented Dec 4, 2023

newFixedThreadPool 核心=最大，队列是无界的。所以当任务处理不过来的时候，会出现OOM
newSingleThreadExecutor 核心=最大=1 队列无界
newCachedThreadPool 一直new线程处理

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qxlx commented Dec 4, 2023

lsof -p pid | wc -l 查看进程打开的文件句柄数

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qxlx commented Dec 4, 2023

https://www.cnblogs.com/waynaqua/p/17873338.html

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qxlx commented Dec 5, 2023

runnable 和 callable的区别
1.runnable没有返回值 2.runnable不能thorw check exception
2.future 可以异步执行 get方法是阻塞的
isDone() 是否执行完毕

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