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/**
   * Detect MapReduce local mode.
   *
   * @return True if we're running in local mode
   */
  private boolean isLocal() {
    // If framework is set to YARN, then we can't be running in local mode
    if("yarn".equals(globalConfiguration.get("mapreduce.framework.name"))) {
      return false;
    }
    // If job tracker address is "local" then we're running in local mode
    return "local".equals(globalConfiguration.get("mapreduce.jobtracker.address"))
        || "local".equals(globalConfiguration.get("mapred.job.tracker"));
  }