Retrieve task statuses from ECS API

        :param job_id (str): AWS Batch job uuid

        Returns one of {SUBMITTED|PENDING|RUNNABLE|STARTING|RUNNING|SUCCEEDED|FAILED}

def get_job_status(self, job_id):
        """Retrieve task statuses from ECS API

        :param job_id (str): AWS Batch job uuid

        Returns one of {SUBMITTED|PENDING|RUNNABLE|STARTING|RUNNING|SUCCEEDED|FAILED}
        """
        response = self._client.describe_jobs(jobs=[job_id])

        # Error checking
        status_code = response['ResponseMetadata']['HTTPStatusCode']
        if status_code != 200:
            msg = 'Job status request received status code {0}:\n{1}'
            raise Exception(msg.format(status_code, response))

        return response['jobs'][0]['status']