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 .

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