My site's typical page is like this:

http://www.v2ex.com/t/7577

As you have seen, a topic with dozens replies, each reply carry 3 entities: 
reply, member and avatar. And there are other supporting dynamic elements 
on the page (most of them can be cached).

But when someone replied to the topic, then it will trigger a lot memcached 
objects to be removed. For hot topics, memcached objects can just survive 
minutes or even seconds.

And there could be 100+ or even 1000+ entities on one page.

If I knew they're going to charge datastore reads/writes, I may think 
another way to write the code. But now, it's too painful to rewrite the 
whole site.

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