Connection to memcached via socket

[artemNN]

Need support connection to memcached via socket in filter.
Socket connection is more powerful than TCP and more convenient for single-host installation

[leandrojmp]

I just needed the same feature and saw that it is already supported.

The memcached filter uses the Dalli gem, which supports connecting to memcached using a unix socket, as you can see in the client.rb file.

Just tested and was able to use both set and get into a memcached using unix sockets, just need to set the hosts option to point to the socket and make sure that the user running logstash has permissions to write/read on the socket.