Apache Twill 是一个 Apache Hadoop YARN 的抽象层，减少了开发分布式应用程序的复杂度，允许开发者把精力放在应用逻辑上。Apache Twill 可以让你向使用线程一样来使用 YARN 的分布式编程模型。

示例代码：

public class EchoServer implements TwillRunnable {  private static Logger LOG = LoggerFactory.getLogger(EchoServer.class);  private final ServerSocket serverSocket;  private final int port;  public EchoServer() {    ...  }  @Override  public void run() {    while ( isRunning() ) {      Socket socket = serverSocket.accept();      ...    }  }}

运行：

TwillRunnerService runnerService = new YarnTwillRunnerService(  new YarnConfiguration(), zkConnectStr);runnerService.startAndWait();TwillController controller = runnerService.prepare(new EchoServer())  .addLogHandler(new PrinterLogHandler(new PrintWriter(System.out)))  .start();controller.addListener(new ListenerAdapter() {  @Override  public void running() {    LOG.info('Echo Server Started');  }}controller.stop().get();

文章转载自 开源中国社区 [