Resque worker failing with PostgreSQL server

Question

I've managed to set up my workers and they used to execute without issue (in development) but now they don't in either production or development (I'm guessing after changing from SQlite3 to PostgreSQL).

When I run a rake command to run the workers with rake resque:work QUEUE=* I get the following error and stack trace:

getaddrinfo: nodename nor servname provided, or not known

I get the following errors when running heroku rake resque:work QUEUE=* in the console to test pending workers in the queue.

Class         SentimentJob
Arguments     [4, 5, 6]
Exception     ActiveRecord::StatementInvalid
Error         PGError: server closed the connection unexpectedly This probably means
              the server terminated abnormally before or while processing the request.
              : SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc,
              a.attnotnull FROM pg_attribute a LEFT JOIN pg_attrdef d ON a.attrelid =
              d.adrelid AND a.attnum = d.adnum WHERE a.attrelid = '"taggings"'::regclass
              AND a.attnum > 0 AND NOT a.attisdropped ORDER BY a.attnum

And for my Facebook worker:

Class         FBConnectionsJob
Arguments     1
Exception     OpenSSL::SSL::SSLError
Error         SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B:
              certificate verify failed

Class         FBConnectionsJob
Arguments     1
Exception     ActiveRecord::StatementInvalid
Error         PGError: server closed the connection unexpectedly This probably means
              the server terminated abnormally before or while processing the request.
              : SELECT tablename FROM pg_tables WHERE schemaname = ANY
              (current_schemas(false)) 

Why do I get different errors in different environments? My initializer files look like:

Should I add ENV specifications here?

Resque.rb

uri = URI.parse(ENV["REDISTOGO_URL"])
Resque.redis = Redis.new(:host => uri.host, :port => uri.port, :password => uri.password)
Dir["#{Rails.root}/app/jobs/*.rb"].each { |file| require file }

Redis.rb

uri = URI.parse(ENV["REDISTOGO_URL"])
REDIS = Redis.new(:host => uri.host, :port => uri.port, :password => uri.password)
Resque.redis = REDIS

My environments/production.rb file has no reference to Redis and my environments/development.rb file has this for Redis setup:

ENV["REDISTOGO_URL"] = 'redis://username:password@my.host:6789' 

Answer 1

Adding the following to my Rakefile fixed a similar problem for me:

task "resque:setup" => :environment do
  Resque.before_fork = Proc.new { ActiveRecord::Base.establish_connection }
end

This reconnects PostgreSQL before Resque forks its process to create a worker.

Answer 2

It looks like your app can not connect to Redis server. Did you provide valid connection details for production environment? Is you Redis server available? Isn't it behind firewall are some private network?

I think it might be same issue with you production PostgreSQL server.

Answer 3

I've changed the initializers to the following and it now works on localhost, so @mirtinciu was right about the server connection. Still need to figure out what is wrong on the production server.

if Rails.env.development?
  uri = URI.parse(ENV["REDISTOGO_URL"])
  Resque.redis = Redis.new(:host => 'localhost', :port => '6379')
else
  uri = URI.parse(ENV["REDISTOGO_URL"])
  Resque.redis = Redis.new(:host => uri.host, :port => uri.port, :password => uri.password)
end

Answer 4

I think it's a duplicate and it is solved by restoring the ActiveRecord connection: Rails Resque workers fail with PGError: server closed the connection unexpectedly