Products that do master/master across the WAN (or high latency LAN) and
can assure that a request to server A in datacenter 1 that sets a value
is available immediately (sub milisecond) to server B in datacenter 2?
And that does not involve making a connection back across the WAN to get
the data? Please do tell.
Brian.
http://brian.moonspot.net
On 4/5/11 4:44 PM, Roberto Spadim wrote:
hummm i think it´s not innovative, there´s some open projects that
solve this, you should check before developing the whell again
2011/4/5 Mohit Anchlia<mohitanch...@gmail.com>:
Thanks everyone for replying. There is no easy solution for the
requirements being imposed upon us. Even though we have Oc3 still this
may not work sine memcached seems to be hash accross the servers
architecture and not master/master type architecture.
I will have to come up with some other innovative idea to solve this
particular complex requirement.
On Mon, Apr 4, 2011 at 11:23 PM, Dustin<dsalli...@gmail.com> wrote:
On Apr 4, 9:28 pm, Roberto Spadim<robe...@spadim.com.br> wrote:
i'm using repcache without problem, if one server die the other have
the same information, when other server is up it's automatic sync with
the 'master'
it works well with php memcache session handler
but a good session handler could be a nosql database (membase) since
it's not a cache, it's a database...
Membase doesn't currently have cross datacenter master/master
replication that can compensate for inconsistencies introduced by
network outages or latency when a user is jumping back and forth
between two data centers. Anything that *can* is going to be much
slower.
I think Brian's got it there. Your best bet is to keep the users
contained where networks are fast. RTT between SF and VA is something
like 20ms. Replication doesn't help the situation. You might as well
pin the data for the user in one data center and just fetch it across
the country every time (which is effectively what AP systems will do).
