ContextCSN generation

[Sven Jourgensen <svenj@uic.edu>]

I have an odd issue, where I have some new slaves that I added to my pool,
they ran fine sync'ing with the master, etc. for weeks, until I added them
into use (we're using an F5 frontend) whereupon they started getting a
contextCSN which was larger than that of the master.

How is the contextCSN generated, I thought the slave could never get ahead
of the master, but it's happening consistently, it's not a transient
thing, the slave gets a larger contextCSN and keeps it, until the master
is updated again.

master:	contextCSN: 20121010154339.775633Z#000000#000#000000
slave1:	contextCSN: 20121010154442.858054Z#000000#000#000000
slave2:	contextCSN: 20121010154351.807575Z#000000#000#000000

As soon as I remove them from use, and update the master, they come back
into sync.

Thanks in advance.

SJ