Examples of org.apache.zookeeper.server.NIOServerCnxnFactory

org.apache.zookeeper.server.NIOServerCnxnFactory
NIOServerCnxnFactory implements a multi-threaded ServerCnxnFactory using NIO non-blocking socket calls. Communication between threads is handled via queues. - 1 accept thread, which accepts new connections and assigns to a selector thread - 1-N selector threads, each of which selects on 1/N of the connections. The reason the factory supports more than one selector thread is that with large numbers of connections, select() itself can become a performance bottleneck. - 0-M socket I/O worker threads, which perform basic socket reads and writes. If configured with 0 worker threads, the selector threads do the socket I/O directly. - 1 connection expiration thread, which closes idle connections; this is necessary to expire connections on which no session is established. Typical (default) thread counts are: on a 32 core machine, 1 accept thread, 1 connection expiration thread, 4 selector threads, and 64 worker threads.

    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");
    }


    // remove the current active zk server

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      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

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        tickTimeToUse = this.tickTime;
      } else {
        tickTimeToUse = TICK_TIME;
      }
      ZooKeeperServer server = new ZooKeeperServer(dir, dir, tickTimeToUse);
      NIOServerCnxnFactory standaloneServerFactory;
      while (true) {
        try {
          standaloneServerFactory = new NIOServerCnxnFactory();
          standaloneServerFactory.configure(
            new InetSocketAddress(tentativePort),
            configuration.getInt(HConstants.ZOOKEEPER_MAX_CLIENT_CNXNS,
              1000));
        } catch (BindException e) {
          LOG.debug("Failed binding ZK Server to client port: " +
              tentativePort);
          // This port is already in use, try to use another.
          tentativePort++;
          continue;
        }
        break;
      }


      // Start up this ZK server
      standaloneServerFactory.startup(server);
      if (!waitForServerUp(tentativePort, CONNECTION_TIMEOUT)) {
        throw new IOException("Waiting for startup of standalone server");
      }


      // We have selected this port as a client port.

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      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) {

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    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");
    }


    // remove the current active zk server

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      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

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    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);
    }

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            File dataDir = new File("./target/zookeeper/log");
            File snapDir = new File("./target/zookeeper/data");
            FileTxnSnapLog ftxn = new FileTxnSnapLog(dataDir, snapDir);
            zkServer.setTxnLogFactory(ftxn);
            zkServer.setTickTime(1000);
            connectionFactory = new NIOServerCnxnFactory();
            connectionFactory.configure(new InetSocketAddress("localhost", clientPort), 0);
            connectionFactory.startup(zkServer);
        }

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      tickTimeToUse = this.tickTime;
    } else {
      tickTimeToUse = TICK_TIME;
    }
    this.zooKeeperServer = new ZooKeeperServer(dir, dir, tickTimeToUse);
    standaloneServerFactory = new NIOServerCnxnFactory();


    // NOTE: Changed from the original, where InetSocketAddress was
    // originally created to bind to the wildcard IP, we now configure it.
    logger.info("Zookeeper force binding to: " + this.bindIP);
    standaloneServerFactory.configure(

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                                               new File(config.getDataDir()));
      _zkServer.setTxnLogFactory(ftxn);
      _zkServer.setTickTime(config.getTickTime());
      _zkServer.setMinSessionTimeout(config.getMinSessionTimeout());
      _zkServer.setMaxSessionTimeout(config.getMaxSessionTimeout());
      _cnxnFactory = new NIOServerCnxnFactory();
      _cnxnFactory.configure(config.getClientPortAddress(), config.getMaxClientCnxns());
                                              
      _cnxnFactory.startup(_zkServer);
    }
    catch(InterruptedException e)

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