如何使Bluepill重啓Resque工人只能達到安全狀態後

Question

比方說，這是我的工作人員：

class FooWorker 
    @queue = :foo 

    def self.perform 
    User.all.each do |u| 
     ... 
     Do Long Operations (Unsafe to kill) 
     ... 

     # Here it's safe to break the worker and restart 
    end 
    end 
end 

我與Resque調度入隊這一點，這是我的Bluepill的conf：

... 
app.process(process_name) do |process| 
    process.group   = "resque" 
    process.start_command = "rake environment resque:work QUEUE=foo RAILS_ENV=production" 
    ... 
    process.stop_signals = [:quit, 5.seconds, :term, 1.minute, :kill] 
    process.daemonize  = true 

    process.start_grace_time = 30.seconds 
    process.stop_grace_time = 80.seconds 

    process.monitor_children do |child_process| 
    child_process.stop_command = "kill -QUIT {{PID}}" 

    child_process.checks :mem_usage, :every => 30.seconds, :below => 500.megabytes, :times => [3,4], :fires => :stop 
    end 
end 
.... 

我想使Bluepill或Resque等到它到達「安全」區塊才能重新啓動或關閉。如何實現這一目標？

Answer 1

試試這樣說：

1）設置resque通過在開始設置TERM_CHILD和RESQUE_TERM_TIMEOUT ENV變量殺死正常的短期/ INT與new_kill_child法兒：

process.start_command = "rake environment resque:work QUEUE=foo RAILS_ENV=production TERM_CHILD=1 RESQUE_TERM_TIMEOUT=20.0" 

爲RESQUE_TERM_TIMEOUT默認值爲4 seconds。

這將使resque發送TERM信號給孩子，等待RESQUE_TERM_TIMEOUT，如果孩子仍在運行，殺死它。一定要

一）設置的超時足夠大，你的關鍵節結束，

二）process.stop_signals配置Bluepill TERM超時是有點比RESQUE_TERM_TIMEOUT大不殺工人在等待子進程結束關鍵部分。

2）子進程句柄TERM信號停止正常：

class FooWorker 
    class << self 
    attr_accessor :stop 
    end 

    @queue = :foo 
    def self.perform 
    User.all.each do |u| 
     ... 
     Do Long Operations (Unsafe to kill) 
     ... 

     # Here it's safe to break the worker and restart 
     return if FooWorker.stop 
    end 
    end 
end 

trap('TERM') do 
    FooWorker.stop = true 
end