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c1f25cdf5b
In our production environment, we have been seeing Sidekiq processes getting stuck randomly when a USR1 signal is sent to the Unicorn master process. We have not been able to identify the root cause of why the Sidekiq process gets stuck. We however noticed that when the Unicorn master process receives a USR1 signal, it will reopen the logs for the Unicorn master process first before sending a USR1 signal for the Unicorn worker processes to reopen the logs. We figured that we should do the same for the Sidekiq process as well when a USR1 signal. In this commit, we introduce an arbitrary delay of 1 second before we the Sidekiq process reopens its log files so as to allow enough time for the Unicorn master to finish reopening it logs first. We also do not send reopen logs for the Sidekiq process if the `DISCOURSE_LOG_SIDEKIQ` env is not present because there is no need to reopen any logs.
88 lines
2.0 KiB
Ruby
88 lines
2.0 KiB
Ruby
# frozen_string_literal: true
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require "demon/base"
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class Demon::Sidekiq < ::Demon::Base
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def self.prefix
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"sidekiq"
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end
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def self.after_fork(&blk)
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blk ? (@blk = blk) : @blk
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end
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private
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def suppress_stdout
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false
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end
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def suppress_stderr
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false
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end
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def log_in_trap(message, level: :info)
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SignalTrapLogger.instance.log(@logger, message, level: level)
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end
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def after_fork
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Demon::Sidekiq.after_fork&.call
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SignalTrapLogger.instance.after_fork
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log("Loading Sidekiq in process id #{Process.pid}")
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require "sidekiq/cli"
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cli = Sidekiq::CLI.instance
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# Unicorn uses USR1 to indicate that log files have been rotated
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Signal.trap("USR1") { reopen_logs }
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Signal.trap("USR2") do
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sleep 1
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reopen_logs
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end
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options = ["-c", GlobalSetting.sidekiq_workers.to_s]
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[["critical", 8], ["default", 4], ["low", 2], ["ultra_low", 1]].each do |queue_name, weight|
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custom_queue_hostname = ENV["UNICORN_SIDEKIQ_#{queue_name.upcase}_QUEUE_HOSTNAME"]
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if !custom_queue_hostname || custom_queue_hostname.split(",").include?(Discourse.os_hostname)
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options << "-q"
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options << "#{queue_name},#{weight}"
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end
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end
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# Sidekiq not as high priority as web, in this environment it is forked so a web is very
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# likely running
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Discourse::Utils.execute_command("renice", "-n", "5", "-p", Process.pid.to_s)
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cli.parse(options)
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load Rails.root + "config/initializers/100-sidekiq.rb"
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cli.run
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rescue => error
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log(
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"Error encountered while starting Sidekiq: [#{error.class}] #{error.message}\n#{error.backtrace.join("\n")}",
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level: :error,
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)
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exit 1
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end
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private
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def reopen_logs
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begin
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log_in_trap("Sidekiq reopening logs...")
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Unicorn::Util.reopen_logs
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log_in_trap("Sidekiq done reopening logs...")
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rescue => error
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log_in_trap(
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"Error encountered while reopening logs: [#{error.class}] #{error.message}\n#{error.backtrace.join("\n")}",
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level: :error,
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)
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exit 1
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end
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end
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end
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