Sidekiq Broken Pipe Error

问题

I am attempting to migrate from Heroku to AWS, but my Sidekiq jobs keep failing with the following error:

Errno::EPIPE: Broken pipe @ io_write - <STDOUT>

I can successfully run jobs from the console using perform_now, and everything works just fine in Heroku, so I am presuming the issue lies somewhere with my AWS setup. I have seen references to improper daemonization around Stack Overflow and Github but not sure how to solve the problem.

Right now I am launching my processes with the following command:

foreman start -f Procfile -p 3000 -e $VAR_FILES &

and I have tried the command both with and without the & at the end.

My Procfile looks like this:

web: bundle exec puma -t 1:2 -p ${PORT:-3000} -e ${RACK_ENV:-production} worker: bundle exec sidekiq -C config/sidekiq.yml log: tail -f log/production.log

and I have also tried it like this, following the instructions here (https://github.com/mperham/sidekiq/wiki/Logging#syslog):

worker: bundle exec sidekiq -C config/sidekiq.yml 2>&1 | logger -t sidekiq

My sidekiq.yml has logfile set to ./log/sidekiq.log, which I believe is supposed to redirecting logs away from STDOUT anyway.

I have seen the discussion here (https://github.com/mperham/sidekiq/issues/3188) and can verify that the rails12factor gem is not in my Gemfile.

But still the error persists... Can anyone lend a hand?

UPDATE: I can finally get a stack trace and see it is coming from a puts statement inside of the Neo4j.rb gem:

2017-04-07T15:46:53.553Z 697 TID-12a6r4 WARN: Errno::EPIPE: Broken pipe @ io_write - <STDOUT> 2017-04-07T15:46:53.553Z 697 TID-12a6r4 WARN: /var/lib/gems/2.3.0/bundler/gems/neo4j-c804cb33bef8/lib/neo4j/session_manager.rb:60:in `write' /var/lib/gems/2.3.0/bundler/gems/neo4j-c804cb33bef8/lib/neo4j/session_manager.rb:60:in `puts' /var/lib/gems/2.3.0/bundler/gems/neo4j-c804cb33bef8/lib/neo4j/session_manager.rb:60:in `puts'

But still not sure how I can mitigate the issue. I have tried with RAILS_LOG_TO_STDOUT=enabled both set and unset.