code: def _batch_load(project, workspace, headerline, entity_data, chunk_size=500):
      
  
  
      if fcconfig.verbosity:
          print("Batching " + str(len(entity_data)) + " updates to Firecloud...")
  
      # Parse the entity type from the first cell, e.g. "entity:sample_id"
      # First check that the header is valid
      if not _valid_headerline(headerline):
          eprint("Invalid loadfile header:\n" + headerline)
          return 1
  
      update_type = "membership" if headerline.startswith("membership") else "entitie"
      etype = headerline.split('\t')[0].split(':')[1].replace("_id", "")
  
      # Split entity_data into chunks
      total = int(len(entity_data) / chunk_size) + 1
      batch = 0
      for i in range(0, len(entity_data), chunk_size):
          batch += 1
          if fcconfig.verbosity:
              print("Updating {0} {1}s {2}-{3}, batch {4}/{5}".format(
                  etype, update_type, i+1, min(i+chunk_size, len(entity_data)),
                  batch, total))
          this_data = headerline + '\n' + '\n'.join(entity_data[i:i+chunk_size])
  
          # Now push the entity data to firecloud
          r = fapi.upload_entities(project, workspace, this_data)
          fapi._check_response_code(r, 200)
  
      return 0
docs: Submit a large number of entity updates in batches of chunk_size