Constant CPU Usage on a fresh install on Mac OS X 10.9

Hi,

Today I try to run Counchbase Server 2.2 on my Mac Book Air with Mac OS X 10.9.
I import two sample buckets (beers and gamesim).

And for a long time I don’t have any interactions with the server (meaning get/set any documents). The server constantly cost around 10% CPU.

I’m not sure why this happen.

Could anyone explain the reason for this issue?