code: def _heavyQuery(variantSetId, callSetIds):
      
      request = protocol.SearchVariantsRequest()
      request.reference_name = '2'
      request.variant_set_id = variantSetId
      for callSetId in callSetIds:
          request.call_set_ids.add(callSetId)
      request.page_size = 100
      request.end = 100000
      return request
docs: Very heavy query: calls for the specified list of callSetIds
      on chromosome 2 (11 pages, 90 seconds to fetch the entire thing
      on a high-end desktop machine)