We would like to have a map of all users in datastore in mem cache so that 
we can look up for any username/email/number to verify if he is already an 
user of our app. Ex: A user wants to send some message to an email address 
from our mobile app. We want to find if there is any user in our database 
with that email id and do something different. We could do a costly query 
all the time or do a quick lookup in MemCache if user exists. For each of 
our user account, we have a primaryKey but we cannot query with that field 
all the time. We would like to update the mem cache like once a day with 
all user accounts and tag them with multiple fields. So interested in the 
size of the mem cache for an app with 4-5 million records which are small 
key/value pairs. 

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