code: private synchronized void requestEvaluators() {
      assert this.state == State.INIT;
      LOG.log(Level.INFO, "Schedule on {0} Evaluators.", this.numEvaluators);
      this.evaluatorRequestor.newRequest()
          .setMemory(128)
          .setNumberOfCores(1)
          .setNumber(this.numEvaluators)
          .submit();
      this.state = State.WAIT_EVALUATORS;
      this.expectCount = this.numEvaluators;
    }
docs: Request the evaluators.