server/src/main/java/com/orientechnologies/orient/server/distributed/ODistributedConfiguration.java
public List<String> getMasterServers() {
    final List<String> serverList = getClusterConfiguration(null).field(SERVERS);
    if (serverList != null) {
      // COPY AND REMOVE ANY NEW_NODE_TAG
      List<String> masters = new ArrayList<String>(serverList.size());
      for (String s : serverList) {
        if (!s.equals(NEW_NODE_TAG))
          masters.add(s);
      }

      final ROLES defRole = getDefaultServerRole();

      final ODocument servers = configuration.field(SERVERS);
      if (servers != null) {
        for (Iterator<String> it = masters.iterator(); it.hasNext(); ) {
          final String server = it.next();
          final String roleAsString = servers.field(server);
          final ROLES role = roleAsString != null ? ROLES.valueOf(roleAsString.toUpperCase(Locale.ENGLISH)) : defRole;
          if (role != ROLES.MASTER)
            it.remove();
        }
      }

      return masters;
    }

    return Collections.EMPTY_LIST;
  }
public List<String> getMasterServers() {
    final List<String> serverList = getClusterConfiguration(null).field(SERVERS);
    if (serverList != null) {
      // COPY AND REMOVE ANY NEW_NODE_TAG
      List<String> masters = new ArrayList<String>(serverList.size());
      for (String s : serverList) {
        if (!s.equals(NEW_NODE_TAG))
          masters.add(s);
      }

      final ROLES defRole = getDefaultServerRole();

      final ODocument servers = configuration.field(SERVERS);
      if (servers != null) {
        for (Iterator<String> it = masters.iterator(); it.hasNext(); ) {
          final String server = it.next();
          final String roleAsString = servers.field(server);
          final ROLES role = roleAsString != null ? ROLES.valueOf(roleAsString.toUpperCase(Locale.ENGLISH)) : defRole;
          if (role != ROLES.MASTER)
            it.remove();
        }
      }

      return masters;
    }

    return Collections.EMPTY_LIST;
  }
Returns an ordered list of master server. The first in the list is the first found in configuration. This is used to determine
the cluster leader.