org.apache.zookeeper.server.NIOServerCnxnFactory Java Examples

public EmbeddedZookeeper(int port, Path baseDir) throws Exception {
    this.port = port;

    zookeeperBaseDir = baseDir;

    zkServer = new ZooKeeperServer();
    File dataDir = zookeeperBaseDir.resolve("log").toFile();
    File snapDir = zookeeperBaseDir.resolve("data").toFile();
    FileTxnSnapLog ftxn = new FileTxnSnapLog(dataDir, snapDir);
    zkServer.setTxnLogFactory(ftxn);
    zkServer.setTickTime(1000);
    connectionFactory = new NIOServerCnxnFactory() {
        @Override
        protected void configureSaslLogin() throws IOException {
            // do nothing
        }
    };
    connectionFactory.configure(new InetSocketAddress("localhost", port), 0);
}
 

/**
 * @throws IOException
 */
public void shutdown() throws IOException {
  if (!started) {
    return;
  }
  // shut down all the zk servers
  for (int i = 0; i < standaloneServerFactoryList.size(); i++) {
    NIOServerCnxnFactory standaloneServerFactory =
      standaloneServerFactoryList.get(i);
    int clientPort = clientPortList.get(i);

    standaloneServerFactory.shutdown();
    if (!waitForServerDown(clientPort, CONNECTION_TIMEOUT)) {
      throw new IOException("Waiting for shutdown of standalone server");
    }
  }

  // clear everything
  started = false;
  activeZKServerIndex = 0;
  standaloneServerFactoryList.clear();
  clientPortList.clear();
  zooKeeperServers.clear();

  logger.info("Shutdown MiniZK cluster with all ZK servers");
}
 

@BeforeClass
public static void setupZooKeeper() throws Exception {
  // create a ZooKeeper server(dataDir, dataLogDir, port)
  LOG.info("Starting ZK server");
  ZkTmpDir = File.createTempFile("zookeeper", "test");
  ZkTmpDir.delete();
  ZkTmpDir.mkdir();

  try {
    zks = new ZooKeeperServer(ZkTmpDir, ZkTmpDir, ZooKeeperDefaultPort);
    serverFactory = new NIOServerCnxnFactory();
    serverFactory.configure(new InetSocketAddress(ZooKeeperDefaultPort), 10);
    serverFactory.startup(zks);
  } catch (Exception e) {
    LOG.error("Exception while instantiating ZooKeeper", e);
  }

  boolean b = LocalBookKeeper.waitForServerUp(HOSTPORT, CONNECTION_TIMEOUT);
  LOG.debug("ZooKeeper server up: " + b);
}
 

@BeforeClass
public static void setupZooKeeper() throws Exception {
  LOG.info("Starting ZK server");
  zkTmpDir = File.createTempFile("zookeeper", "test");
  zkTmpDir.delete();
  zkTmpDir.mkdir();
  try {
    zks = new ZooKeeperServer(zkTmpDir, zkTmpDir, ZooKeeperDefaultPort);
    serverFactory = new NIOServerCnxnFactory();
    serverFactory.configure(new InetSocketAddress(ZooKeeperDefaultPort), 10);
    serverFactory.startup(zks);
  } catch (Exception e) {
    LOG.error("Exception while instantiating ZooKeeper", e);
  }
  boolean b = LocalBookKeeper.waitForServerUp(HOSTPORT, CONNECTION_TIMEOUT);
  LOG.debug("ZooKeeper server up: " + b);
}
 

/**
 * Kill one back up ZK servers
 *
 * @throws IOException
 * @throws InterruptedException
 */
public void killOneBackupZooKeeperServer() throws IOException,
  InterruptedException {
  if (!started || activeZKServerIndex < 0 ||
    standaloneServerFactoryList.size() <= 1) {
    return;
  }

  int backupZKServerIndex = activeZKServerIndex + 1;
  // Shutdown the current active one
  NIOServerCnxnFactory standaloneServerFactory =
    standaloneServerFactoryList.get(backupZKServerIndex);
  int clientPort = clientPortList.get(backupZKServerIndex);

  standaloneServerFactory.shutdown();
  if (!waitForServerDown(clientPort, CONNECTION_TIMEOUT)) {
    throw new IOException("Waiting for shutdown of standalone server");
  }

  // remove this backup zk server
  standaloneServerFactoryList.remove(backupZKServerIndex);
  clientPortList.remove(backupZKServerIndex);
  zooKeeperServers.remove(backupZKServerIndex);
  logger.info("Kill one backup ZK servers in the cluster " +
    "on client port: " + clientPort);
}
 

public CCEmbeddedZookeeper() {
  int tickTime = 500;
  try {
    File snapshotDir = CCKafkaTestUtils.newTempDir();
    File logDir = CCKafkaTestUtils.newTempDir();
    _zk = new ZooKeeperServer(snapshotDir, logDir, tickTime);
    _cnxnFactory = new NIOServerCnxnFactory();
    InetAddress localHost = InetAddress.getLocalHost();
    _hostAddress = localHost.getHostAddress();
    InetSocketAddress bindAddress = new InetSocketAddress(localHost, 0);
    _cnxnFactory.configure(bindAddress, 0);
    _cnxnFactory.startup(_zk);
    _port = _zk.getClientPort();
  } catch (Exception e) {
    throw new IllegalStateException(e);
  }
  //sanity check
  if (_zk.getClientPort() != _port) {
    throw new IllegalStateException();
  }
}
 

public EmbeddedZookeeper() {
  try {
    snapshotDir = KafkaTestUtils.newTempDir();
    logDir = KafkaTestUtils.newTempDir();
    tickTime = 500;
    zk = new ZooKeeperServer(snapshotDir, logDir, tickTime);
    registerShutdownHandler(zk);
    cnxnFactory = new NIOServerCnxnFactory();
    InetAddress localHost = InetAddress.getLocalHost();
    hostAddress = localHost.getHostAddress();
    InetSocketAddress bindAddress = new InetSocketAddress(localHost, port);
    cnxnFactory.configure(bindAddress, 0);
    cnxnFactory.startup(zk);
    port = zk.getClientPort();
  } catch (Exception e) {
    throw new IllegalStateException(e);
  }
  //sanity check
  if (zk.getClientPort() != port) {
    throw new IllegalStateException();
  }
}
 

@BeforeClass
public static void setupZooKeeper() throws Exception {
  LOG.info("Starting ZK server");
  zkTmpDir = File.createTempFile("zookeeper", "test");
  zkTmpDir.delete();
  zkTmpDir.mkdir();
  try {
    zks = new ZooKeeperServer(zkTmpDir, zkTmpDir, ZooKeeperDefaultPort);
    serverFactory = new NIOServerCnxnFactory();
    serverFactory.configure(new InetSocketAddress(ZooKeeperDefaultPort), 10);
    serverFactory.startup(zks);
  } catch (Exception e) {
    LOG.error("Exception while instantiating ZooKeeper", e);
  }
  boolean b = LocalBookKeeper.waitForServerUp(HOSTPORT, CONNECTION_TIMEOUT);
  LOG.debug("ZooKeeper server up: " + b);
}
 

@BeforeClass
public static void setupZooKeeper() throws Exception {
  // create a ZooKeeper server(dataDir, dataLogDir, port)
  LOG.info("Starting ZK server");
  ZkTmpDir = File.createTempFile("zookeeper", "test");
  ZkTmpDir.delete();
  ZkTmpDir.mkdir();

  try {
    zks = new ZooKeeperServer(ZkTmpDir, ZkTmpDir, ZooKeeperDefaultPort);
    serverFactory = new NIOServerCnxnFactory();
    serverFactory.configure(new InetSocketAddress(ZooKeeperDefaultPort), 10);
    serverFactory.startup(zks);
  } catch (Exception e) {
    LOG.error("Exception while instantiating ZooKeeper", e);
  }

  boolean b = LocalBookKeeper.waitForServerUp(HOSTPORT, CONNECTION_TIMEOUT);
  LOG.debug("ZooKeeper server up: " + b);
}
 

@Override
public Statement apply(Statement s, Description d) {
  return new StatementAdapter(s) {
    @Override
    protected void before() throws Throwable {
      if (!applied.getAndSet(true)) {
        UncaughtExceptionHandler p = Thread.getDefaultUncaughtExceptionHandler();
        try {
          // Try to initialize a zookeeper class that reinitializes default exception handler.
          Class<?> cl = NIOServerCnxnFactory.class;
          // Make sure static initializers have been called.
          Class.forName(cl.getName(), true, cl.getClassLoader());
        } finally {
          if (p == Thread.getDefaultUncaughtExceptionHandler()) {
          //  throw new RuntimeException("Zookeeper no longer resets default thread handler.");
          }
          Thread.setDefaultUncaughtExceptionHandler(p);
        }
      }
    }
  };
}
 

private ZooKeeperTestServer(int port) throws IOException {
    zooKeeperDir = getTempDir();
    delete(zooKeeperDir);
    if (!zooKeeperDir.mkdir()) {
        throw new IllegalStateException("Failed to create directory " + zooKeeperDir);
    }
    zooKeeperDir.deleteOnExit();
    server = new ZooKeeperServer(zooKeeperDir, zooKeeperDir, (int)tickTime.toMillis());
    final int maxcc = 10000; // max number of connections from the same client
    factory = new NIOServerCnxnFactory();
    factory.configure(new InetSocketAddress(port), maxcc); // Use any port
    try{
        factory.startup(server);
    } catch (InterruptedException e) {
        throw (RuntimeException) new IllegalStateException("Interrupted during test startup: ").initCause(e);
    }
}
 

@Override
protected void before() throws Throwable {
    snapshotDir = tempDir(perTest("zk-snapshot"));
    logDir = tempDir(perTest("zk-log"));
    log.info("Setting up ZK Server with snapshotDir:{}, logDir:{}", snapshotDir, logDir);

    int tickTime = 500;
    try {
        zooKeeperServer = new ZooKeeperServer(snapshotDir, logDir, tickTime);
        cnxnFactory = new NIOServerCnxnFactory();
        cnxnFactory.configure(new InetSocketAddress("127.0.0.1", port), 0);
        cnxnFactory.startup(zooKeeperServer);
    } catch (IOException e) {
        e.printStackTrace();
    }
}
 

/**
 * Constructs an embedded Zookeeper instance.
 *
 * @param connectString Zookeeper connection string.
 *
 * @throws IOException if an error occurs during Zookeeper initialization.
 */
public EmbeddedZookeeper(String connectString) throws IOException {
    this.snapshotDir = KafkaTestUtils.getTempDir();
    this.logDir = KafkaTestUtils.getTempDir();
    this.factory = new NIOServerCnxnFactory();
    String hostname = connectString.split(":")[0];
    int port = Integer.parseInt(connectString.split(":")[1]);
    int maxClientConnections = 1024;
    factory.configure(new InetSocketAddress(hostname, port), maxClientConnections);
    try {
        int tickTime = 500;
        factory.startup(new ZooKeeperServer(snapshotDir, logDir, tickTime));
    } catch (InterruptedException e) {
        throw new IOException(e);
    }
}
 

public void afterPropertiesSet() throws Exception {
    if (purge) {
        deleteFilesInDir(getDataLogDir());
        deleteFilesInDir(getDataDir());
    }
    FileTxnSnapLog ftxn = new FileTxnSnapLog(getDataLogDir(), getDataDir());
    zooKeeperServer.setTxnLogFactory(ftxn);
    zooKeeperServer.setTickTime(getTickTime());
    zooKeeperServer.setMinSessionTimeout(getMinSessionTimeout());
    zooKeeperServer.setMaxSessionTimeout(getMaxSessionTimeout());
    connectionFactory = new NIOServerCnxnFactory() {
        @Override
        protected void configureSaslLogin() throws IOException {
            // do nothing
        }
    };
    connectionFactory.configure(getClientPortAddress(), getMaxClientConnections());
    connectionFactory.startup(zooKeeperServer);
}
 

/**
 * Starts zookeeper up on an ephemeral port.
 */
public void startNetwork() throws IOException, InterruptedException {
  zooKeeperServer =
      new ZooKeeperServer(
          new FileTxnSnapLog(dataDir, snapDir),
          new BasicDataTreeBuilder()) {

        // TODO(John Sirois): Introduce a builder to configure the in-process server if and when
        // some folks need JMX for in-process tests.
        @Override protected void registerJMX() {
          // noop
        }
      };

  connectionFactory = new NIOServerCnxnFactory();
  connectionFactory.configure(
      new InetSocketAddress(port),
      60 /* Semi-arbitrary, max 60 connections is the default used by NIOServerCnxnFactory */);
  connectionFactory.startup(zooKeeperServer);
  port = zooKeeperServer.getClientPort();
}
 

@Override
public void before() throws IOException {
    snapshotDir = new File("target/test-classes/zk-snapshot");
    snapshotDir.mkdirs();
    logDir = new File("target/test-classes/zk-log");
    logDir.mkdirs();

    try {
        zooKeeperServer = new ZooKeeperServer(snapshotDir, logDir, tickTime);
        cnxnFactory = new NIOServerCnxnFactory();
        cnxnFactory.configure(new InetSocketAddress("localhost", port), 1024);
        cnxnFactory.startup(zooKeeperServer);
    } catch (InterruptedException e) {
        throw new IOException(e);
    }
}
 

/**
 * Kill one back up ZK servers.
 *
 * @throws IOException if waiting for the shutdown of a server fails
 */
public void killOneBackupZooKeeperServer() throws IOException, InterruptedException {
  if (!started || activeZKServerIndex < 0 || standaloneServerFactoryList.size() <= 1) {
    return ;
  }

  int backupZKServerIndex = activeZKServerIndex+1;
  // Shutdown the current active one
  NIOServerCnxnFactory standaloneServerFactory =
    standaloneServerFactoryList.get(backupZKServerIndex);
  int clientPort = clientPortList.get(backupZKServerIndex);

  standaloneServerFactory.shutdown();
  if (!waitForServerDown(clientPort, connectionTimeout)) {
    throw new IOException("Waiting for shutdown of standalone server");
  }

  zooKeeperServers.get(backupZKServerIndex).getZKDatabase().close();

  // remove this backup zk server
  standaloneServerFactoryList.remove(backupZKServerIndex);
  clientPortList.remove(backupZKServerIndex);
  zooKeeperServers.remove(backupZKServerIndex);
  LOG.info("Kill one backup ZK servers in the cluster on client port: {}", clientPort);
}
 

public void startup() throws IOException{
    if (this.port == -1) {
        this.port = TestUtils.getAvailablePort();
    }
    this.factory = NIOServerCnxnFactory.createFactory(new InetSocketAddress("localhost", port), 1024);
    this.snapshotDir = TestUtils.constructTempDir("embeeded-zk/snapshot");
    this.logDir = TestUtils.constructTempDir("embeeded-zk/log");
    final ZooKeeperServer zooKeeperServer = new ZooKeeperServer(snapshotDir, logDir, tickTime);
    try {
        factory.startup(zooKeeperServer);
    } catch (InterruptedException e) {
        throw new IOException(e);
    }
    assertEquals("standalone", zooKeeperServer.getState());
    assertEquals(this.port, zooKeeperServer.getClientPort());

}
 

public static void startZookeeper(final int clusterId)
{
  try {

    int numConnections = 100;
    int tickTime = 2000;
    File dir = new File(baseDir, zkdir[clusterId]);

    zkServer[clusterId] = new TestZookeeperServer(dir, dir, tickTime);
    zkFactory[clusterId] = new NIOServerCnxnFactory();
    zkFactory[clusterId].configure(new InetSocketAddress(TEST_ZOOKEEPER_PORT[clusterId]), numConnections);

    zkFactory[clusterId].startup(zkServer[clusterId]); // start the zookeeper server.
    Thread.sleep(2000);
    //kserver.startup();
  } catch (Exception ex) {
    logger.error(ex.getLocalizedMessage());
  }
}
 

public static void startZookeeper(final int clusterId)
{
  try {

    int numConnections = 100;
    int tickTime = 2000;
    File dir = new File(baseDir, zkdir[clusterId]);

    zkServer[clusterId] = new TestZookeeperServer(dir, dir, tickTime);
    zkFactory[clusterId] = new NIOServerCnxnFactory();
    zkFactory[clusterId].configure(new InetSocketAddress(TEST_ZOOKEEPER_PORT[clusterId]), numConnections);

    zkFactory[clusterId].startup(zkServer[clusterId]); // start the zookeeper server.
    Thread.sleep(2000);
    //kserver.startup();
  } catch (Exception ex) {
    logger.error(ex.getLocalizedMessage());
  }
}
 

public void startZookeeper(final int clusterId)
{

  try {
    //before start, clean the zookeeper files if it exists
    FileUtils.deleteQuietly(new File(baseDir, zkBaseDir));
    int clientPort = TEST_ZOOKEEPER_PORT[clusterId];
    int numConnections = 10;
    int tickTime = 2000;
    File dir = new File(baseDir, zkdir[clusterId]);

    TestZookeeperServer kserver = new TestZookeeperServer(dir, dir, tickTime);
    zkFactory[clusterId] = new NIOServerCnxnFactory();
    zkFactory[clusterId].configure(new InetSocketAddress(clientPort), numConnections);

    zkFactory[clusterId].startup(kserver); // start the zookeeper server.
    Thread.sleep(2000);
    kserver.startup();
  } catch (Exception ex) {
    logger.debug(ex.getLocalizedMessage());
  }
}
 

public void start() throws IOException {
    try {
        // Allow all commands on ZK control port
        System.setProperty("zookeeper.4lw.commands.whitelist", "*");
        // disable the admin server as to not have any port conflicts
        System.setProperty("zookeeper.admin.enableServer", "false");
        zks = new ZooKeeperServer(zkTmpDir, zkTmpDir, ZooKeeperServer.DEFAULT_TICK_TIME);
        zks.setMaxSessionTimeout(20000);
        serverFactory = new NIOServerCnxnFactory();
        serverFactory.configure(new InetSocketAddress(zkPort), 1000);
        serverFactory.startup(zks);
    } catch (Exception e) {
        log.error("Exception while instantiating ZooKeeper", e);
    }

    this.zkPort = serverFactory.getLocalPort();
    this.hostPort = "127.0.0.1:" + zkPort;

    LocalBookkeeperEnsemble.waitForServerUp(hostPort, 30000);
    log.info("ZooKeeper started at {}", hostPort);
}
 

public MiniZooKeeperCluster(Configuration configuration) {
  this.started = false;
  this.configuration = configuration;
  activeZKServerIndex = -1;
  zooKeeperServers = new ArrayList<ZooKeeperServer>();
  clientPortList = new ArrayList<Integer>();
  standaloneServerFactoryList = new ArrayList<NIOServerCnxnFactory>();
}
 

public ZookeeperServer(File root) throws IOException, InterruptedException {
    zkServer = new ZooKeeperServer();

    File dataDir = new File(root, "log");
    File snapDir = new File(root, "data");
    FileTxnSnapLog ftxn = new FileTxnSnapLog(dataDir, snapDir);

    zkServer.setTxnLogFactory(ftxn);
    zkServer.setTickTime(1000);

    connectionFactory = new NIOServerCnxnFactory();
    connectionFactory.configure(new InetSocketAddress("localhost", SocketUtils.findAvailableTcpPort()), 0);
    connectionFactory.startup(zkServer);
}
 

/**
 * @throws IOException
 */
public void shutdown() throws IOException {
  if (!started) {
    return;
  }

  // shut down all the zk servers
  for (int i = 0; i < standaloneServerFactoryList.size(); i++) {
    NIOServerCnxnFactory standaloneServerFactory =
      standaloneServerFactoryList.get(i);
    int clientPort = clientPortList.get(i);

    standaloneServerFactory.shutdown();
    if (!waitForServerDown(clientPort, CONNECTION_TIMEOUT)) {
      throw new IOException("Waiting for shutdown of standalone server");
    }
  }
  for (ZooKeeperServer zkServer: zooKeeperServers) {
    //explicitly close ZKDatabase since ZookeeperServer does not close them
    zkServer.getZKDatabase().close();
  }

  // clear everything
  started = false;
  activeZKServerIndex = 0;
  standaloneServerFactoryList.clear();
  clientPortList.clear();
  zooKeeperServers.clear();

  LOG.info("Shutdown MiniZK cluster with all ZK servers");
}
 

/**@return clientPort return clientPort if there is another ZK backup can run
 *         when killing the current active; return -1, if there is no backups.
 * @throws IOException
 * @throws InterruptedException
 */
public int killCurrentActiveZooKeeperServer() throws IOException,
  InterruptedException {
  if (!started || activeZKServerIndex < 0 ) {
    return -1;
  }

  // Shutdown the current active one
  NIOServerCnxnFactory standaloneServerFactory =
    standaloneServerFactoryList.get(activeZKServerIndex);
  int clientPort = clientPortList.get(activeZKServerIndex);

  standaloneServerFactory.shutdown();
  if (!waitForServerDown(clientPort, CONNECTION_TIMEOUT)) {
    throw new IOException("Waiting for shutdown of standalone server");
  }

  zooKeeperServers.get(activeZKServerIndex).getZKDatabase().close();

  // remove the current active zk server
  standaloneServerFactoryList.remove(activeZKServerIndex);
  clientPortList.remove(activeZKServerIndex);
  zooKeeperServers.remove(activeZKServerIndex);
  LOG.info("Kill the current active ZK servers in the cluster " +
    "on client port: " + clientPort);

  if (standaloneServerFactoryList.size() == 0) {
    // there is no backup servers;
    return -1;
  }
  clientPort = clientPortList.get(activeZKServerIndex);
  LOG.info("Activate a backup zk server in the cluster " +
    "on client port: " + clientPort);
  // return the next back zk server's port
  return clientPort;
}
 

/**
 * Kill one back up ZK servers
 * @throws IOException
 * @throws InterruptedException
 */
public void killOneBackupZooKeeperServer() throws IOException,
  InterruptedException {
  if (!started || activeZKServerIndex < 0 ||
    standaloneServerFactoryList.size() <= 1) {
    return ;
  }

  int backupZKServerIndex = activeZKServerIndex+1;
  // Shutdown the current active one
  NIOServerCnxnFactory standaloneServerFactory =
    standaloneServerFactoryList.get(backupZKServerIndex);
  int clientPort = clientPortList.get(backupZKServerIndex);

  standaloneServerFactory.shutdown();
  if (!waitForServerDown(clientPort, CONNECTION_TIMEOUT)) {
    throw new IOException("Waiting for shutdown of standalone server");
  }

  zooKeeperServers.get(backupZKServerIndex).getZKDatabase().close();

  // remove this backup zk server
  standaloneServerFactoryList.remove(backupZKServerIndex);
  clientPortList.remove(backupZKServerIndex);
  zooKeeperServers.remove(backupZKServerIndex);
  LOG.info("Kill one backup ZK servers in the cluster " +
    "on client port: " + clientPort);
}
 

/**
 * Kill one back up ZK servers
 * @throws IOException
 * @throws InterruptedException
 */
public void killOneBackupZooKeeperServer() throws IOException,
        InterruptedException {
    if (!started || activeZKServerIndex < 0 ||
            standaloneServerFactoryList.size() <= 1) {
        return ;
    }

    int backupZKServerIndex = activeZKServerIndex+1;
    // Shutdown the current active one
    NIOServerCnxnFactory standaloneServerFactory =
            standaloneServerFactoryList.get(backupZKServerIndex);
    int clientPort = clientPortList.get(backupZKServerIndex);

    standaloneServerFactory.shutdown();
    if (!waitForServerDown(clientPort, CONNECTION_TIMEOUT)) {
        throw new IOException("Waiting for shutdown of standalone server");
    }

    zooKeeperServers.get(backupZKServerIndex).getZKDatabase().close();

    // remove this backup zk server
    standaloneServerFactoryList.remove(backupZKServerIndex);
    clientPortList.remove(backupZKServerIndex);
    zooKeeperServers.remove(backupZKServerIndex);
    LOG.info("Kill one backup ZK servers in the cluster " +
            "on client port: " + clientPort);
}
 

public EmbeddedZookeeper(int port) throws IOException {
  zkDataDir = Files.createTempDir();
  zkServer = new ZooKeeperServer();

  FileTxnSnapLog ftxn = new FileTxnSnapLog(zkDataDir, zkDataDir);
  zkServer.setTxnLogFactory(ftxn);

  cnxnFactory = new NIOServerCnxnFactory();
  cnxnFactory.configure(new InetSocketAddress(port), 0);
}
 

@Override
public void run() {

    Utility util = Utility.getInstance();
    AppConfigReader reader = AppConfigReader.getInstance();
    String zkDir = reader.getProperty("zk.dir", "/tmp/zk");
    int tickTime = util.str2int(reader.getProperty("zk.tick", "2000"));
    if (tickTime < 1000) {
        log.info("zk.tick is too small. Reset to 1000 ms");
        tickTime = 1000;
    }
    File baseDir = new File(zkDir);
    if (baseDir.exists()) {
        // this guarantees that a standalone zookeeper will start with a clean state
        util.cleanupDir(baseDir);
        log.info("Clean up transient Zookeeper working directory at {}", baseDir);
    }
    File snapshotDir = new File(baseDir, "snapshots");
    File logDir = new File(baseDir, "log");
    try {
        this.factory = NIOServerCnxnFactory.createFactory(2181, 512);
        factory.startup(new ZooKeeperServer(snapshotDir, logDir, tickTime));
    } catch (IOException | InterruptedException e) {
        log.error("Unable to start Zookeeper - {}", e.getMessage());
        System.exit(-1);
    }

}