Method open

src/mon/MonitorDBStore.h:679–706

  }

  int open(std::ostream &out) {
    std::string kv_type;
    int r = read_meta("kv_backend", &kv_type);
    if (r < 0 || kv_type.empty()) {
      // assume old monitors that did not mark the type were RocksDB.
      kv_type = "rocksdb";
      r = write_meta("kv_backend", kv_type);
      if (r < 0)
	return r;
    }
    _open(kv_type);
    r = db->open(out);
    if (r < 0)
      return r;

    // Monitors are few in number, so the resource cost of exposing 
    // very detailed stats is low: ramp up the priority of all the
    // KV store's perf counters.  Do this after open, because backend may
    // not have constructed PerfCounters earlier.
    if (db->get_perf_counters()) {
      db->get_perf_counters()->set_prio_adjust(
          PerfCountersBuilder::PRIO_USEFUL - PerfCountersBuilder::PRIO_DEBUGONLY);
    }

    io_work.start();
    is_open = true;
    return 0;
  }

  int create_and_open(std::ostream &out) {
    int r = write_meta("ceph_version_when_created", pretty_version_to_str());