Ceph

we currently do

set<int> new_peers;
  if (role == 0) {
    for (unsigned i=0; i<acting.size(); i++)
      new_peers.insert(acting[i]);
    for (unsigned i=0; i<up.size(); i++)
      new_peers.insert(up[i]);
    for (map<int,pg_info_t>::iterator p = peer_info.begin(); p != peer_info.end(); ++p)
      new_peers.insert(p->first);
  }

but we need to include anything in the prior probe set.. and/or anything else we might depend on to recover. not sure the cleanest way to slurp that out of a recovery state machine state...