Fault tolerance memcache server about dalli HOT 15 CLOSED

Can you give me an example of an exception that leaks through? :dalli_store catches all DalliErrors and returns nil, like so, so I'm not sure what your exact problem is.

    def read_entry(key, options) # :nodoc:
      deserialize_entry(@data.get(escape_key(key), RAW))
    rescue Dalli::DalliError => e
      logger.error("DalliError: #{e.message}") if logger
      nil
    end

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I saw this code as well, but it just doesn't work. When I change the name of the memcache server then invoke Rails.cache.read method, it return this exception SocketError "getaddrinfo: Name or service not known".

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Sorry, I mistakenly click button "Comment and Close".

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Yes, that's the Dalli bug: I'm not converting all system errors into DalliErrors. Can you please give me a full stack trace?

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Sorry for bad pasting. Here is a full stack trace:

getaddrinfo: Name or service not known

/usr/lib/ruby/gems/1.8/gems/dalli-0.10.1/lib/dalli/server.rb:281:in getaddrinfo' /usr/lib/ruby/gems/1.8/gems/dalli-0.10.1/lib/dalli/server.rb:281:inconnection'
/usr/lib/ruby/gems/1.8/gems/dalli-0.10.1/lib/dalli/server.rb:305:in write' /usr/lib/ruby/gems/1.8/gems/dalli-0.10.1/lib/dalli/server.rb:201:intext_version'
/usr/lib/ruby/gems/1.8/gems/dalli-0.10.1/lib/dalli/server.rb:77:in detect_memcached_version' /usr/lib/ruby/gems/1.8/gems/dalli-0.10.1/lib/dalli/server.rb:17:ininitialize'
/usr/lib/ruby/gems/1.8/gems/dalli-0.10.1/lib/dalli/client.rb:156:in new' /usr/lib/ruby/gems/1.8/gems/dalli-0.10.1/lib/dalli/client.rb:156:inring'
/usr/lib/ruby/gems/1.8/gems/dalli-0.10.1/lib/dalli/client.rb:155:in map' /usr/lib/ruby/gems/1.8/gems/dalli-0.10.1/lib/dalli/client.rb:155:inring'
/usr/lib/ruby/gems/1.8/gems/dalli-0.10.1/lib/dalli/client.rb:48:in get_multi' (eval):2:inread_multi'
/var/www/people_test/app/controllers/application_controller.rb:189:in read_collection_from_uris' /var/www/people_test/app/controllers/portals_controller.rb:10:inindex'

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Did you fix that bug yet?

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Fixed in github, not released yet though.

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When do you plan to release new version?

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3 hours ago. :-)

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It seems the exception goes away, but those methods freeze for > 5 seconds. I wonder why.

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I tested on dalli 0.11.1, read_multi still raise exceptions
Dalli::NetworkError: 192.168.0.177:11211 is currently down: Errno::EPIPE Broken pipe.

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The latest release should fix this issue.

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I upgrade to use dalli (1.0.4), When I called Rails.cache.read, it raises SocketError: getaddrinfo: Name or service not known. When i use the get method of Dalli::Client, it raises Dalli::RingError exception.

I see your code in lib/active_support to wrap the Dalli::DalliError exception, but for some reasons in my rails 2.3 app still raises the exception.

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chamnap, please give a stack trace with error reports.

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Sorry for late reply!

ubuntu@ubuntu:/var/www/api_refactoring$ script/console
Loading development environment (Rails 2.3.2)

Rails.cache.read("key")
SocketError: getaddrinfo: Name or service not known
from /usr/lib/ruby/gems/1.8/gems/dalli-1.0.4/lib/dalli/socket.rb:82:in getaddrinfo' from /usr/lib/ruby/gems/1.8/gems/dalli-1.0.4/lib/dalli/socket.rb:82:inopen'
from /usr/lib/ruby/gems/1.8/gems/dalli-1.0.4/lib/dalli/server.rb:382:in connect' from /usr/lib/ruby/gems/1.8/gems/dalli-1.0.4/lib/dalli/server.rb:72:inalive?'
from /usr/lib/ruby/gems/1.8/gems/dalli-1.0.4/lib/dalli/options.rb:24:in alive?' from /usr/lib/ruby/1.8/monitor.rb:242:insynchronize'
from /usr/lib/ruby/gems/1.8/gems/dalli-1.0.4/lib/dalli/options.rb:23:in alive?' from /usr/lib/ruby/gems/1.8/gems/dalli-1.0.4/lib/dalli/ring.rb:42:inserver_for_key'
from /usr/lib/ruby/gems/1.8/gems/dalli-1.0.4/lib/dalli/client.rb:239:in perform' from /usr/lib/ruby/gems/1.8/gems/dalli-1.0.4/lib/dalli/client.rb:60:inget'
from /usr/lib/ruby/gems/1.8/gems/dalli-1.0.4/lib/active_support/cache/dalli_store23.rb:74:in read' from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/cache/strategy/local_cache.rb:39:inread'

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