Memcached, Stale Cache & Config Problem

[blj]

I use memcahced server to help radiant to store the output. Unfortunately, I got this error randomly and the website stops working. Even when I did script/console it would come with this error:

/app/models/radiant/config.rb:84:in []':NoMethodError: undefined method[]' for nil:NilClass

The line that is being thrown error is :Rails.cache.read('Radiant::Config')[key].

So I restarted memcached server and then the error disappeared. I wonder whether Radiant has cached something and if it is no longer returned by the cache server, instead of fallback it throws the above error.

[jfahrenkrug]

Are you using the dalli gem to talk to memcached?

[blj]

Yes I am using dalli gem.

[jfahrenkrug]

Interesting. Does your log say something? Did the memcached server possibly freeze or crash because of too long keys or values? Also, are you using Passenger? If so, adding this to your environment.rb might help:

if defined?(PhusionPassenger)
  PhusionPassenger.on_event(:starting_worker_process) do |forked|
    # Only works with DalliStore
    Rails.cache.reset if forked
  end
end

[blj]

I did not check the log. I do not think the memcached server froze, it was
working with other software. I already have that part in my production.rb.
It certainly did not help.

On Wed, Feb 6, 2013 at 5:30 PM, Johannes Fahrenkrug <
notifications@github.com> wrote:

Interesting. Does your log say something? Did the memcached server
possibly freeze or crash because of too long keys or values? Also, are you
using Passenger? If so, adding this to your environment.rb might help:

if defined?(PhusionPassenger)
PhusionPassenger.on_event(:starting_worker_process) do |forked|
# Only works with DalliStore
Rails.cache.reset if forked
end
end

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/350#issuecomment-13178786.