Hammer incompat bits and ceph-objectstore-tool

[David Zafman <dzafman@redhat.com>]

During upgrade testing an error occurred because ceph-objectstore-tool 
found during import on a Firefly node the compat_features from a export 
from Hammer.

There are 2 new feature bits set as shown in the error message:

Export has incompatible features set 
compat={},rocompat={},incompat={12=transaction hints,13=pg meta object}

In this case as far as I can tell these osd incompatible changes 
wouldn't make the export data in any way incompatible.  So we may have 
to check compatibility bits on a case by case basis, if we want to allow 
the tool to work in the most cases possible.

During upgrade testing it is interesting that one node has the 
transaction hints feature, but other nodes still running firefly don't.  
Is this a case where we don't have to wait for all  OSDs to update 
before the cluster can start handling OP_COLL_HINT operations?

David Zafman