upgrade from beta1 to 0.81

Hi folks,

As the tools in 0.8 are not stable and we don't want to take the risk. we want
to skip 0.8 and upgrade from beta1 to 0.81 directly. So my question is whether
we can do an in place upgrade and let 0.81 use beta1's zk and kf data. Assume
that we will disable log compaction. Thanks.

Regards,

Libo