On 16 May 2007, at 13:46, Julio Leyva wrote:
If I have two or three servers running memcached , how they
synchronized each other?
They are not - they have no idea other servers exist.
How the application knows which memcached server to communicate to?
It's all done at the client end: every client must define an
identical set of servers.
So it means that any operation from then on will affect all the
servers in that list?
memcache_delete(/* key */ TEXT, /* hold timer */ INTERVAL)
memcache_delete(/* key */ TEXT)
This command will affect both servers?
No, there is no redundancy. Only one server will get this command.
This is what makes memcached scalable.
What if one server goes down, when it comes back, how the get
synchronized?
They won't. It's just a cache, so requests for stuff on the missing
server will fall through to the DB, eventually populating the cache
again.
Marcus
--
Marcus Bointon
Synchromedia Limited: Creators of http://www.smartmessages.net/
UK resellers of [EMAIL PROTECTED] CRM solutions
[EMAIL PROTECTED] | http://www.synchromedia.co.uk/
