code: public Map<String, OptionalFailure<Object>> getAccumulators(JobID jobID) throws Exception {
  		return getAccumulators(jobID, ClassLoader.getSystemClassLoader());
  	}
docs: Requests and returns the accumulators for the given job identifier. Accumulators can be
  requested while a is running or after it has finished. The default class loader is used
  to deserialize the incoming accumulator results.
  @param jobID The job identifier of a job.
  @return A Map containing the accumulator's name and its value.