Ceph

I think this is the problem:

diff --git a/src/messages/MOSDMap.h b/src/messages/MOSDMap.h
index fa46189bf0..865642cf41 100644
--- a/src/messages/MOSDMap.h
+++ b/src/messages/MOSDMap.h
@@ -113,6 +113,14 @@ public:
          inc.fullmap.clear();
          m.encode(inc.fullmap, features | CEPH_FEATURE_RESERVED);
        }
+       if (inc.crush.length()) {
+         // embedded crush map
+         CrushWrapper c;
+         auto p = inc.crush.begin();
+         c.decode(p);
+         inc.crush.clear();
+         c.encode(inc.crush, features);
+       }
        inc.encode(p->second, features | CEPH_FEATURE_RESERVED);
       }
       for (map<epoch_t,bufferlist>::iterator p = maps.begin();

we weren't reencoding a compat version of the incrementals.. only the full maps.