开源框架学习

学习和大数据相关的框架。

当tomcat并发用户量大的时候，单个jvm进程确实可能打开过多的文件句柄。

（1）.ps -ef |grep tomcat 查看tomcat的进程ID，记录ID号，假设进程ID为10001
（2）.lsof -p 10001|wc -l 查看当前进程id为10001的 文件操作数
（3）.使用命令：ulimit -a 查看每个用户允许打开的最大文件数
4 缓存同步的几个Design Pattern的，如：Cache aside, Read through, Write through, Write behind caching..

Blogs on Tomcat Tunning

1. [Cool, Tomcat is able to handle more than 13,000 concurrent connections](http://blog.krecan.net/2010/05/02/cool-tomcat-is-able-to-handle-more-than-13000-concurrent-connections/%29
2. [Apache Tomcat Tuning Guide]%28https://javamaster.wordpress.com/2013/03/13/apache-tomcat-tuning-guide/%29
3. [用“逐步排除”的方法定位Java服务线上“系统性”故障]%28http://techblog.youdao.com/?p=961%29
4. [cache design pattern]%28https://msdn.microsoft.com/zh-cn/library/dn589799.aspx%29
5. [Java Monitoring Tool]%28https://docs.oracle.com/javase/8/docs/technotes/tools/unix/toc.html%29
6. [Netty资料皆阵列在前]%28http://calvin1978.blogcn.com/articles/netty-info.html%29
7. [生成全局唯一ID的3个思路，来自一个资深架构师的总结]%28http://mp.weixin.qq.com/s?__biz=MzA5Nzc4OTA1Mw==&mid=2659598286&idx=1&sn=3172172ccea316b0ed83429ae718b54d&chksm=8be9eadcbc9e63caa10d708274b4fa34ceffa416ef4527e10e6b7a1a2d2f32cf8592d65bf728#rd)

2 O'Reilly Topic/Idea

3 developer-roadmap

1. 10 Extraordinary GitHub Repos for All Developers