生产日志上的延迟作业调试

Question

我正在使用Rails 5 和DelayedJob 设置后台任务，用于简单的电子邮件通知。

查看我的生产日志，发现以下项目：

[2016-08-05T20:22:15.094172 #10616] DEBUG -- : 
Delayed::Backend::ActiveRecord::Job Load (1.0ms)  UPDATE "delayed_jobs"
SET locked_at = '2016-08-06 10:22:15.092656', locked_by = 'delayed_job 
host:jiably pid:10616' WHERE id IN (SELECT  "delayed_jobs"."id" FROM 
"delayed_jobs" WHERE ((run_at <= '2016-08-06 10:22:15.091986' AND 
(locked_at IS NULL OR locked_at < '2016-08-06 06:22:15.092073') OR 
locked_by = 'delayed_job host:vps-server-name pid:10616') AND failed_at IS NULL) ORDER BY priority ASC, run_at ASC LIMIT 1 FOR UPDATE) RETURNING *

队列中没有作业，当我测试我的应用程序的电子邮件通知时，作业似乎处理得很好。

这正常吗？它似乎经常重复并添加到日志文件中。我确实有 logrotate 设置，但不确定这是我做的配置还是错过的配置。

感谢您对此有所了解。

Answer 1

您可能会看到 Delayed::Job 问题 477 here。编辑：我知道你说这发生在生产中。需要修改修复程序或您的配置以匹配该问题。

如果是这样，修复就在那里。我在这里实现了 config/initializers/delayed_job_config.rb （注意我已经实现了分期）：

Delayed::Worker.max_attempts = 5
Delayed::Worker.delay_jobs = !Rails.env.test?
Delayed::Worker.sleep_delay = 10
Delayed::Worker.default_priority = 100

# Prevent excessive logging every 5 seconds when Logger level < WARN
# https://github.com/collectiveidea/delayed_job/issues/477
if %w(development staging).include? Rails.env
  module Delayed
    module Backend
      module ActiveRecord
        class Job
          class << self
            alias_method :reserve_original, :reserve
            def reserve(worker, max_run_time = Worker.max_run_time)
              previous_level = ::ActiveRecord::Base.logger.level
              ::ActiveRecord::Base.logger.level = Logger::WARN if previous_level < Logger::WARN
              value = reserve_original(worker, max_run_time)
              ::ActiveRecord::Base.logger.level = previous_level
              value
            end
          end
        end
      end
    end
  end
end