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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