Working resque pool setup for NewRelic

resque_pool.rake

require 'resque/pool/tasks'

# this task will get called before resque:pool:setup
# preload the rails environment in the pool master
task "resque:setup" => :environment do
  # generic worker setup, e.g. Hoptoad for failed jobs
end

task "resque:pool:setup" do
  # Close any sockets or files in pool master
  ActiveRecord::Base.connection.disconnect!
  
  # This happens after resque-pool has forked your worker
  # but before it performs Resque::Worker#startup
  Resque::Pool.after_prefork do |job|

    # Re-connect to your database
    ActiveRecord::Base.establish_connection
    
    # Load NewRelic here.  We've already forked and we're good to go.
    NewRelic::Agent.manual_start(
      :dispatcher             => :resque,
      :sync_startup           => true,
      :start_channel_listener => true
    )
    
    Resque.before_first_fork do
      # Normally you'd do this here if you aren't using resque-pool
      # NewRelic::Agent.manual_start(
      #   :dispatcher             => :resque,
      #   :sync_startup           => true,
      #   :start_channel_listener => true
      # )
      
      # Empty block so that you nuke newrelic_rpm's built in hooks
      # You can do other things here though or just set this to nil
    end
      
    Resque.before_fork do |job|
      NewRelic::Agent.register_report_channel(job.object_id)
    end
      
    Resque.after_fork do |job|
      NewRelic::Agent.after_fork(:report_to_channel => job.object_id)
    end
    
  end
end

Does it really work? I've been trying without success...

This actually did not work for us, until we set the NEWRELIC_DISPATCHER env variable in our Rakefile, before it just wasn't detecting the resque dispatcher.

Just to further clarify, the NEWRELIC_DISPATCHER env variable (as referenced in the comment above) should be set to "resque", since New Relic normally sets that variable on agent start-up to whatever dispatcher it detects.

FYI, we've just released version 3.6.7 of the newrelic_rpm gem, which should support resque-pool out of the box!

Works great for me