rake因"虚拟计时器已过期"而失败

Question

以下是我的环境:

• OS X 10.5
• Xcode 3.1.4
• rvm 0.1.38
• 红宝石1.8.9-p399(通过rvm)
• rails 2.3.8

当rake尝试运行我的测试时,我开始收到此错误:

bash$ rake
Virtual timer expired
bash$  # End of output!

并启用跟踪:

bash$ rake --trace
** Invoke default (first_time)
** Invoke test (first_time)
** Execute test
** Invoke test:units (first_time)
** Invoke db:test:prepare (first_time)
** Invoke db:abort_if_pending_migrations (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:abort_if_pending_migrations
** Execute db:test:prepare
** Invoke db:test:load (first_time)
** Invoke db:test:purge (first_time)
** Invoke environment 
** Execute db:test:purge
** Execute db:test:load
** Invoke db:schema:load (first_time)
** Invoke environment 
** Execute db:schema:load
Virtual timer expired
bash$

Answer 1

看起来ruby中存在问题,rev23993导致虚拟计时器在分叉时过期,从而触发mysql gem 内部的错误.

实际的解决方法似乎是将mysql gem从2.8.1降级 到2.7版:

#environment.rb
config.gem 'mysql', :version => '2.7'