thread pool hell
this post content
- some of the basics of asynchronous programming,
- the tools that are available in Play 2.1 and Scala,
- the patterns that make it easy to manage non-blocking code.
web frameworks handle concurrent requests, I/O, and threads.
- Threaded: Servlets, Ruby on Rails, Django, PHP
- Evented: Play, Node.js, Twisted
Threaded
- it’s easy for all of them to become tied up waiting for I/O, preventing any new requests from being processed even though most of your threads are just idly waiting.
Evented
- even a single long calculation or accidental blocking I/O call can bring an Evented server to its knees.
Furture的组合
Java线程模型／执行流程
Java线程池机制
http://mmcgrana.github.io/2010/07/threaded-vs-evented-servers.html
https://engineering.linkedin.com/play/play-framework-async-io-without-thread-pool-and-callback-hell
