private void initialize(InetSocketAddress jobTrackAddr, Configuration conf)
    throws IOException {

  synchronized (frameworkLoader) {
    for (ClientProtocolProvider provider : frameworkLoader) {
      LOG.debug("Trying ClientProtocolProvider : "
          + provider.getClass().getName());
      ClientProtocol clientProtocol = null; 
      try {
        if (jobTrackAddr == null) {
          clientProtocol = provider.create(conf);
        } else {
          clientProtocol = provider.create(jobTrackAddr, conf);
        }

        if (clientProtocol != null) {
          clientProtocolProvider = provider;
          client = clientProtocol;
          LOG.debug("Picked " + provider.getClass().getName()
              + " as the ClientProtocolProvider");
          break;
        }
        else {
          LOG.debug("Cannot pick " + provider.getClass().getName()
              + " as the ClientProtocolProvider - returned null protocol");
        }
      } 
      catch (Exception e) {
        LOG.info("Failed to use " + provider.getClass().getName()
            + " due to error: " + e.getMessage());
      }
    }
  }

  if (null == clientProtocolProvider || null == client) {
    throw new IOException(
        "Cannot initialize Cluster. Please check your configuration for "
            + MRConfig.FRAMEWORK_NAME
            + " and the correspond server addresses.");
  }
}
 

private void initialize(InetSocketAddress jobTrackAddr, Configuration conf)
    throws IOException {

  synchronized (frameworkLoader) {
    for (ClientProtocolProvider provider : frameworkLoader) {
      LOG.debug("Trying ClientProtocolProvider : "
          + provider.getClass().getName());
      ClientProtocol clientProtocol = null; 
      try {
        if (jobTrackAddr == null) {
          clientProtocol = provider.create(conf);
        } else {
          clientProtocol = provider.create(jobTrackAddr, conf);
        }

        if (clientProtocol != null) {
          clientProtocolProvider = provider;
          client = clientProtocol;
          LOG.debug("Picked " + provider.getClass().getName()
              + " as the ClientProtocolProvider");
          break;
        }
        else {
          LOG.debug("Cannot pick " + provider.getClass().getName()
              + " as the ClientProtocolProvider - returned null protocol");
        }
      } 
      catch (Exception e) {
        LOG.info("Failed to use " + provider.getClass().getName()
            + " due to error: " + e.getMessage());
      }
    }
  }

  if (null == clientProtocolProvider || null == client) {
    throw new IOException(
        "Cannot initialize Cluster. Please check your configuration for "
            + MRConfig.FRAMEWORK_NAME
            + " and the correspond server addresses.");
  }
}