Rails.cache.write returns false with MemCacheStore even if the operation has was successful done.

result = Rails.cache.write('key', 'value')
Rails.cache.read('key') # => value
puts result # => false

The problem is trivial: MemCache#set doesn't return any result, so the check performed by MemCacheStore#write will always fail. http://github.com/rails/rails/tr...

The described behavior is related to memcache-client (1.5.0). I noticed differences between the gem installed on my machine and the bundled one:

memcached-client (1.5.0) gem

http://pastie.org/296380

memcached-client bundled

http://github.com/rails/rails/tr...

I wrote and attached a patch to force using bundled gem to solve this issue.