private static Cassandra.Client createThriftClient(
     String host, int port, String user, String passwd, ITransportFactory transportFactory)
     throws Exception {
   TTransport trans = transportFactory.openTransport(host, port);
   TProtocol protocol = new TBinaryProtocol(trans);
   Cassandra.Client client = new Cassandra.Client(protocol);
   if (user != null && passwd != null) {
     Map<String, String> credentials = new HashMap<>();
     credentials.put(IAuthenticator.USERNAME_KEY, user);
     credentials.put(IAuthenticator.PASSWORD_KEY, passwd);
     AuthenticationRequest authenticationRequest = new AuthenticationRequest(credentials);
     client.login(authenticationRequest);
   }
   return client;
 }
    public void init(String keyspace) {
      outputHandler.output(
          String.format(
              "Starting client (and waiting %d seconds for gossip) ...",
              StorageService.RING_DELAY / 1000));
      try {
        // Init gossip
        StorageService.instance.initClient();

        Set<InetAddress> hosts = Gossiper.instance.getLiveMembers();
        hosts.remove(FBUtilities.getLocalAddress());
        if (hosts.isEmpty())
          throw new IllegalStateException(
              "Cannot load any sstable, no live member found in the cluster");

        // Query endpoint to ranges map and schemas from thrift
        String host = hosts.iterator().next().toString().substring(1);
        int port = DatabaseDescriptor.getRpcPort();

        Cassandra.Client client = createThriftClient(host, port);
        List<TokenRange> tokenRanges = client.describe_ring(keyspace);
        List<KsDef> ksDefs = client.describe_keyspaces();

        Token.TokenFactory tkFactory = StorageService.getPartitioner().getTokenFactory();

        try {
          for (TokenRange tr : tokenRanges) {
            Range range =
                new Range(tkFactory.fromString(tr.start_token), tkFactory.fromString(tr.end_token));
            for (String ep : tr.endpoints) {
              addRangeForEndpoint(range, InetAddress.getByName(ep));
            }
          }
        } catch (UnknownHostException e) {
          throw new RuntimeException("Got an unknow host from describe_ring()", e);
        }

        for (KsDef ksDef : ksDefs) {
          Set<String> cfs = new HashSet<String>();
          for (CfDef cfDef : ksDef.cf_defs) cfs.add(cfDef.name);
          knownCfs.put(ksDef.name, cfs);
        }
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
    }
    @Override
    public void init(String keyspace) {
      Iterator<InetAddress> hostiter = hosts.iterator();
      while (hostiter.hasNext()) {
        try {
          // Query endpoint to ranges map and schemas from thrift
          InetAddress host = hostiter.next();
          Cassandra.Client client =
              createThriftClient(
                  host.getHostAddress(), rpcPort, this.user, this.passwd, this.transportFactory);

          setPartitioner(client.describe_partitioner());
          Token.TokenFactory tkFactory = getPartitioner().getTokenFactory();

          for (TokenRange tr : client.describe_ring(keyspace)) {
            Range<Token> range =
                new Range<>(
                    tkFactory.fromString(tr.start_token),
                    tkFactory.fromString(tr.end_token),
                    getPartitioner());
            for (String ep : tr.endpoints) {
              addRangeForEndpoint(range, InetAddress.getByName(ep));
            }
          }

          String query =
              String.format(
                  "SELECT * FROM %s.%s WHERE keyspace_name = '%s'",
                  Keyspace.SYSTEM_KS, SystemKeyspace.SCHEMA_COLUMNFAMILIES_CF, keyspace);
          CqlResult result =
              client.execute_cql3_query(
                  ByteBufferUtil.bytes(query), Compression.NONE, ConsistencyLevel.ONE);
          for (CqlRow row : result.rows) {
            CFMetaData metadata = CFMetaData.fromThriftCqlRow(row);
            knownCfs.put(metadata.cfName, metadata);
          }
          break;
        } catch (Exception e) {
          if (!hostiter.hasNext())
            throw new RuntimeException("Could not retrieve endpoint ranges: ", e);
        }
      }
    }
 protected void closeInternal() {
   if (client != null) {
     TTransport transport = client.getOutputProtocol().getTransport();
     if (transport.isOpen()) transport.close();
   }
 }