still trying

datacube/model/__init__.py

@@ -9,6 +9,8 @@
 from datetime import datetime
 from pathlib import Path
 from uuid import UUID
+import yaml
+import zlib
 
 from affine import Affine
 from typing import Optional, List, Mapping, Any, Dict, Tuple, Iterator
@@ -35,6 +37,7 @@ class Dataset(object):
     :param metadata_doc: the document (typically a parsed json/yaml)
     :param uris: All active uris for the dataset
     """
+    # pylint: disable=too-many-public-methods
 
     def __init__(self,
                  type_: 'DatasetType',
@@ -51,7 +54,8 @@ def __init__(self,
 
         #: The document describing the dataset as a dictionary. It is often serialised as YAML on disk
         #: or inside a NetCDF file, and as JSON-B inside the database index.
-        self.metadata_doc = metadata_doc
+        self._metadata_doc = None
+        self._metadata_doc_compressed = zlib.compress(yaml.dump(metadata_doc).encode('utf-8'))
 
         if local_uri:
             warnings.warn(
@@ -78,6 +82,18 @@ def __init__(self,
         # When the dataset was archived. Null it not archived.
         self.archived_time = archived_time
 
+    @property
+    def metadata_doc(self):
+        if self._metadata_doc is None:
+            self._metadata_doc = yaml.load(zlib.decompress(self._metadata_doc_compressed).decode('utf-8'))
+            del self._metadata_doc_compressed
+
+        return self._metadata_doc
+
+    @metadata_doc.setter
+    def metedata_doc(self, value):
+        self._metadata_doc = value
+
     @property
     def metadata_type(self) -> Optional['MetadataType']:
         return self.type.metadata_type if self.type else None