Kiran Kumar, you can do what you intended to do, but not in the way you
intended to do.
memcached has already a useful way to support scalability, with increment
of performance lineally.
if you already have "one Memcached for the entire application".
and work well, so, if you need scale your application, only
you need to do is add some servers to the previous memcached cluster.
As You Stated, This Configuration is Working OK.
Streaming Application -----Write-----> Memcached ------Read/Delete---->
ClientReads
|
|
|
Svr1
Now, You have grow, and need make a scale of your Memcached.
The easiest way is:
Streaming Application -----Write-----> Memcached ------Read/Delete---->
Client
/ | \
/ | \
/ | \
Svr1 Svr2 Svr3
You can do this, with this instructions:
*//PHP
$MEMCACHE_SERVERS = array(
"10.1.1.1", //Svr1
"10.1.1.2", //Svr2
"10.1.1.3", //Svr3
);
$memcache = new Memcache();
foreach($MEMCACHE_SERVERS as $server){
$memcache->addServer ( $server );
}
*
Code taken from:
Here<http://stackoverflow.com/questions/4717559/multiple-memcached-servers-question>
This way, the performance is incremented because is using multiple servers
to do the task (writes/reads/deletes),
So, the hole capacity, (if each Server has 8Gig Ram, so the Memcached
cluster have 24Gig RAM) and boosted in performance.
Again, you do need to do what you initially intended to do. all is already
done with memcache in the current version.
If you need Replication, that is another problem. but you do not mention
that.
Do not use the same web server as memcache server, use as separated servers
exclusively for memcached as the graph
shows. (may be you think differently).
On Friday, October 12, 2012 9:17:25 AM UTC-5, Kiran Kumar wrote:
>
> Initially there is one Memcache for the entire application , now we expect
> some 50000 users on to our application , so as part of re modeling we are
> going with 2 Memcache servers , which will be working independently to
> suppourt scalibility , and as the exisiting application is designed in such
> a way that one part of the Application will be writing to both the
> instances of the application .
>
> On Thursday, 11 October 2012 20:28:06 UTC+5:30, Kiran Kumar wrote:
>>
>> I am working on a heavy traffic web site , where there will be GB's of
>> data written per minute into our Memcache . So we have decided to use two
>> separate instances of Memcache for the application .
>>
>> Right now the setup is that , there is NO clustering between Memcache1
>> and Memcache2 because , Memcache1 caches 50% of the data and Memcache2
>> caches the other 50% of the data.
>>
>> Memcache1 Memcache2
>> \ /
>> \ /
>> \ /
>> \ /
>> \ /
>> \ /
>> CustomerData
>>
>> So right now as per the set up , there are two Memcache instances for a
>> single application .
>>
>> Now my question is , once we recive a value inside the application ,
>> which writes/sets to both the Memcache instances , assume that if a key is
>> read one of the instance of Memcache - 1 , i need to delete the same key on
>> the other instance of memcahce also at the same time , so taht they will be
>> in sync with each other .
>>
>> As per the code point of view once a value is read from Memcache , i am
>> deleting that key .
>>
>
