raise exception if group load is still in progress after retries. fixes #396
raise exception if group load is still in progress after retries. fixes #396

wikimedia/operations-debs-python-pykafka,benauthor/pykafka,benauthor/pykafka,wikimedia/operations-debs-python-pykafka,benauthor/pykafka,wikimedia/operations-debs-python-pykafka