mirror of
https://github.com/mperham/sidekiq.git
synced 2022-11-09 13:52:34 -05:00
95 lines
3.7 KiB
Ruby
95 lines
3.7 KiB
Ruby
require 'sidekiq'
|
|
require 'sidekiq/util'
|
|
require 'sidekiq/actor'
|
|
|
|
module Sidekiq
|
|
module Scheduled
|
|
|
|
INITIAL_WAIT = 10
|
|
|
|
##
|
|
# The Poller checks Redis every N seconds for messages in the retry or scheduled
|
|
# set have passed their timestamp and should be enqueued. If so, it
|
|
# just pops the message back onto its original queue so the
|
|
# workers can pick it up like any other message.
|
|
class Poller
|
|
include Util
|
|
include Actor
|
|
|
|
SETS = %w(retry schedule)
|
|
|
|
def poll(first_time=false)
|
|
watchdog('scheduling poller thread died!') do
|
|
initial_wait if first_time
|
|
|
|
begin
|
|
# A message's "score" in Redis is the time at which it should be processed.
|
|
# Just check Redis for the set of messages with a timestamp before now.
|
|
now = Time.now.to_f.to_s
|
|
Sidekiq.redis do |conn|
|
|
SETS.each do |sorted_set|
|
|
# Get the next item in the queue if it's score (time to execute) is <= now.
|
|
# We need to go through the list one at a time to reduce the risk of something
|
|
# going wrong between the time jobs are popped from the scheduled queue and when
|
|
# they are pushed onto a work queue and losing the jobs.
|
|
while message = conn.zrangebyscore(sorted_set, '-inf', now, :limit => [0, 1]).first do
|
|
|
|
# Pop item off the queue and add it to the work queue. If the job can't be popped from
|
|
# the queue, it's because another process already popped it so we can move on to the
|
|
# next one.
|
|
if conn.zrem(sorted_set, message)
|
|
Sidekiq::Client.push(Sidekiq.load_json(message))
|
|
logger.debug { "enqueued #{sorted_set}: #{message}" }
|
|
end
|
|
end
|
|
end
|
|
end
|
|
rescue => ex
|
|
# Most likely a problem with redis networking.
|
|
# Punt and try again at the next interval
|
|
logger.error ex.message
|
|
logger.error ex.backtrace.first
|
|
end
|
|
|
|
after(poll_interval * rand) { poll }
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
# We do our best to tune poll_interval to the size of the active Sidekiq
|
|
# cluster. If you have 30 processes and poll every 15 seconds, that means one
|
|
# Sidekiq is checking Redis every 0.5 seconds - way too often for most people
|
|
# and really bad if the retry or scheduled sets are large.
|
|
#
|
|
# Instead try to avoid polling more than once every 15 seconds. If you have
|
|
# 30 Sidekiq processes, we'll set poll_interval to 30 * 15 * 2 or 900 seconds.
|
|
# To keep things statistically random, we'll sleep a random amount between
|
|
# 0 and 900 seconds for each poll or 450 seconds on average. Otherwise restarting
|
|
# all your Sidekiq processes at the same time will lead to them all polling at
|
|
# the same time: the thundering herd problem.
|
|
#
|
|
# We only do this if poll_interval is unset (the default).
|
|
def poll_interval
|
|
Sidekiq.options[:poll_interval] ||= begin
|
|
pcount = Sidekiq.redis {|c| c.scard('processes') } || 1
|
|
pcount * 15 * 2
|
|
end
|
|
end
|
|
|
|
def initial_wait
|
|
begin
|
|
# Have all processes sleep between 10-15 seconds. 10 seconds
|
|
# to give time for the heartbeat to register and 5 random seconds
|
|
# to ensure they don't all hit Redis at the same time.
|
|
sleep(INITIAL_WAIT)
|
|
sleep(5 * rand)
|
|
rescue Celluloid::Task::TerminatedError
|
|
# Hit Ctrl-C when Sidekiq is finished booting and we have a chance
|
|
# to get here.
|
|
end
|
|
end
|
|
|
|
end
|
|
end
|
|
end
|