Redis::InheritedError

[bbuchalter]

When using Unicorn (or any other forking server) I receive this error from delayed_job:
Redis::InheritedError: Tried to use a connection from a child process without reconnecting. You need to reconnect to Redis after forking.

It doesn't seem to break anything, but errors make me sad. So, I'm thinking this method needs away for folks to hook into to be able to call Rails.cache.reconnect and make the errors go away.

I'm happy to open a PR, but perhaps you could advise me on how to structure this hook in a way that would make you happy?

[betamatt]

You receive that error in a web process or in the DJ process? Unicorn, or any choice of webserver, doesn't have anything to do with DJ.

Yes, it's possible the main DJ gem (https://github.com/collectiveidea/delayed_job) needs to provide a hook for forking behavior since daemonizing results in a fork. You'd need to reopen a redis connection if you had opened one during app initialization (I've used a lazy proxy to prevent this.) It would be tough to add this to Lifecycle since before/after fork are executed as class methods before the worker is instantiated. I guess adding a hook on Worker that builds up an array of blocks wouldn't be a bad way to go. Can't imagine anyone would object to that behavior as long as it's a new method.

I suspect most people who've run into this in the past have done a quick alias_method_chain on the Worker's after_fork method to get around this. https://github.com/collectiveidea/delayed_job/blob/master/lib/delayed/worker.rb#L92

(closing/wrong repo)