@staticmethod
    def _getHdfsUser(assetstore):
        return assetstore['hdfs'].get('user') or pwd.getpwuid(os.getuid())[0]
If the given assetstore has an effective user specified, this returns
dataset/ETHPy150Open girder/girder/plugins/hdfs_assetstore/server/assetstore.py/HdfsAssetstoreAdapter._getHdfsUser