When flusher runs – its triggered when the sum of all Stores in a Region > a configurable max size – we flush all Stores though a Store memcache might have but a few bytes.
I would think Stores should only dump their memcache disk if they have some substance.
The problem becomes more acute, the more families you have in a Region.
Possible behaviors would be to dump the biggest Store only, or only those Stores > 50% of max memcache size. Behavior would vary dependent on the prompt that provoked the flush. Would also log why the flush is running: optional or > max size.
This issue comes out of