20/01/2016 - MEMCACHED, SYMFONY
You can store session data in memcached in two ways. One with updating php.ini and config.yml files. Another way is to create a service in symfony and use it instead which is what we're going to do here.
It is currently empty.
stats items
END
# app/config/parameters.yml
parameters:
memcache_server: localhost
memcache_port: 11211
session_prefix: sess_
session_expire: 86400
# app/config/config.yml
imports:
- { resource: services.yml }
framework:
session:
name: hello
handler_id: session.handler.memcached
# app/config/services.yml
services:
memcached:
class: Memcached
calls:
- [addServer, [%memcache_server%, %memcache_port%]]
session.handler.memcached:
class: Symfony\Component\HttpFoundation\Session\Storage\Handler\MemcachedSessionHandler
arguments: [@memcached, { prefix: %session_prefix%, expiretime: %session_expire% }]
In this test I'll use two users.
# Two browser open but no one logged in yet
# Memcached creates two random items (5&6).
> stats items
...
STAT items:5:age 93
...
STAT items:6:age 160
...
END
stats cachedump 5 100
ITEM sess_o2aevqh8843hqf21j0atqd4sm2 [115 b; 1453291464 s]
END
stats cachedump 6 100
ITEM sess_iovf95r2gha5e67fel60oi8dc7 [192 b; 1453291396 s]
END
# Admin user and Test user logged in
# Memcached replaces random items (5&6) with user dedicated ones (11&12).
> stats items
...
STAT items:11:age 3
...
STAT items:12:age 33
...
END
stats cachedump 11 100
ITEM sess_deof8dqij2uollepo9c86d4591 [832 b; 1453291758 s]
END
stats cachedump 12 100
ITEM sess_gqk36m46ds8eugafueqp2e81a6 [966 b; 1453291729 s]
END
# Admin user and Test user visit other pages, do thing etc.
# Memcached still uses same dedicated items (11&12) for owning users.
> stats items
...
STAT items:11:age 182
...
STAT items:12:age 8
...
END
stats cachedump 11 100
ITEM sess_deof8dqij2uollepo9c86d4591 [832 b; 1453291758 s]
END
stats cachedump 12 100
ITEM sess_gqk36m46ds8eugafueqp2e81a6 [966 b; 1453291932 s]
END
# Both of the users logged out
# Memcached reduces two dedicated items (11&12) into one (6) by keeping the items IDs in it.
> stats items
...
STAT items:6:age 21
...
END
stats cachedump 6 100
ITEM sess_deof8dqij2uollepo9c86d4591 [192 b; 1453292171 s]
ITEM sess_gqk36m46ds8eugafueqp2e81a6 [192 b; 1453292153 s]
END
# Admin user and Test user logged in again
# Memcached removes random item (6) and creates user dedicated ones (11&12) with new IDs.
> stats items
...
STAT items:11:age 44
...
STAT items:12:age 4
...
END
stats cachedump 11 100
ITEM sess_1qefj65qc33l6g047l0rpqpdc6 [832 b; 1453292377 s]
END
stats cachedump 12 100
ITEM sess_n4sai4v9r6naemk7do82mkfn04 [966 b; 1453292417 s]
END