今天下午 delayed_job 进程开始出现问题，发现守护进程已死并重新启动它们...
大约 40 分钟后，该进程在 86 个工作岗位上再次死亡。试图再次启动守护进程，发现它们在我启动后立即安静地死去。检查我发现的日志:
s603021@ec2-184-72-244-232:~/rails/gamestreamer/current$ tail -F log/delayed_job.log
SQL (0.7ms) SET NAMES 'utf8'
SQL (0.8ms) SET SQL_AUTO_IS_NULL=0
*** Starting job worker delayed_job.4 host:ec2-184-72-244-232.compute-1.amazonaws.com pid:17397
Delayed::Job Columns (1.5ms) SHOW FIELDS FROM `delayed_jobs`
Product Columns (1.5ms) SHOW FIELDS FROM `products`
Game Columns (2.4ms) SHOW FIELDS FROM `games`
Delayed::Job Update (12.8ms) UPDATE `delayed_jobs` SET locked_by = null, locked_at = null WHERE (locked_by = 'delayed_job.4 host:ec2-184-72-244-232.compute-1.amazonaws.com pid:17397')
#<ArgumentError: syntax error on line 1588, col 10: `'>
我继续进行了一些挖掘，很多人过去常常发现 delayed_jobs 的守护程序 gem 被窃听了，而且 rake 任务仍然有效；然而，对我来说情况并非如此:
s603021@ec2-184-72-244-232:~/rails/gamestreamer/current$ RAILS_ENV=gs1_development rake jobs:work --trace
(in /data01/home/s603021/rails/gamestreamer/releases/20110302193304)
** Invoke jobs:work (first_time)
** Invoke merb_env (first_time)
** Execute merb_env
** Invoke environment (first_time)
** Execute environment
** Execute jobs:work
*** Starting job worker host:ec2-184-72-244-232.compute-1.amazonaws.com pid:17082
rake aborted!
syntax error on line 1588, col 10: `'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/1.8/yaml.rb:133:in `load'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/1.8/yaml.rb:133:in `load'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/job.rb:234:in `deserialize'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/job.rb:50:in `payload_object'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/job.rb:55:in `name'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/job.rb:90:in `run_with_lock'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/job.rb:159:in `reserve_and_run_one_job'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/job.rb:158:in `each'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/job.rb:158:in `reserve_and_run_one_job'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/job.rb:205:in `work_off'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/job.rb:204:in `times'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/job.rb:204:in `work_off'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/worker.rb:30:in `start'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/1.8/benchmark.rb:308:in `realtime'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/worker.rb:29:in `start'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/worker.rb:26:in `loop'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/worker.rb:26:in `start'
/data01/home/s603021/rails/gamestreamer/releases/20110302193304/vendor/plugins/delayed_job/lib/delayed/tasks.rb:13
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31
/usr/bin/rake:19:in `load'
/usr/bin/rake:19
现在我只是不确定可能是什么问题，关于如何获取更多信息(或更详细的异常)的任何建议都很棒。如果有人可以帮助我解决它，那将是令人难以置信的。提前致谢--
Job.rb 文件:http://pastie.org/1697465
最佳答案
几个月前我遇到了一个类似的问题，我的堆栈跟踪吐出:
2011-02-02 20:19:42 INFO -- Processing request 342 for service document_upload, worker 1
2011-02-02 20:19:44 FATAL -- ArgumentError (syntax error on line 29, col -1: `'):
/usr/lib/ruby/1.8/yaml.rb:133:in `load'
/usr/lib/ruby/1.8/yaml.rb:133:in `load'
/var/local/hprime/lib/puck_seed_file.rb:179:in `get_seed'
/var/local/hprime/lib/puck_seed_file.rb:7:in `read'
我花了很长时间才找到导致它的原因，因为它时断时续，但事实证明是正在处理的实际作业中的语法有问题。不确定你在做什么，但你可以从那里开始......？
此外，在尝试解决我的问题时，我遇到了一些人，他们通过将 yaml 中的解析引擎添加到他们的 config/boot.rb 来解决类似的问题
require 'yaml'
YAML::ENGINE.yamler= 'syck'
显然，如果 yaml 内容中包含特殊字符，则默认解析器会吐出虚拟字符。您也可以尝试一下，看看是否有帮助。无论如何，抱歉，它有点含糊，希望它能有所帮助。
关于ruby-on-rails - Delayed_job 为进程守护进程和 rake 任务返回 "syntax error"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5383625/