def finalize(self, ctx, shard_state):
    """Finalize writer shard-level state.

    Args:
      ctx: an instance of context.Context.
      shard_state: shard state.
    """
    mapreduce_spec = ctx.mapreduce_spec
    output_sharding = self.__class__._get_output_sharding(
        mapper_spec=mapreduce_spec.mapper)
    if output_sharding == self.OUTPUT_SHARDING_INPUT_SHARDS:
      filesystem = self._get_filesystem(mapreduce_spec.mapper)
      state = self._State.from_json(shard_state.writer_state)
      writable_filename = state.filenames[0]
      files.finalize(writable_filename)
      finalized_filenames = [self._get_finalized_filename(
          filesystem, state.filenames[0], state.request_filenames[0])]

      state.filenames = finalized_filenames
      state.request_filenames = []
      shard_state.writer_state = state.to_json()



      if filesystem == "blobstore":
        logging.info(
            "Shard %s-%s finalized blobstore file %s.",
            mapreduce_spec.mapreduce_id,
            shard_state.shard_number,
            writable_filename)
        logging.info("Finalized name is %s.", finalized_filenames[0])
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/mapreduce/output_writers.py/FileOutputWriterBase.finalize/original