From 9e590edb706e15ba99d1596d45dbf0d23a0474a1 Mon Sep 17 00:00:00 2001
From: Peter Rowlands <peter@pmrowla.com>
Date: Tue, 4 Jan 2022 15:33:04 +0900
Subject: [PATCH] odb: pin index pickle protocol version

---
 dvc/objects/db/index.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/dvc/objects/db/index.py b/dvc/objects/db/index.py
index 4dc952a64..2b65f07b7 100644
--- a/dvc/objects/db/index.py
+++ b/dvc/objects/db/index.py
@@ -88,7 +88,7 @@ class ObjectDBIndex(ObjectDBIndexBase):
         tmp_dir: "StrPath",
         name: str,
     ):  # pylint: disable=super-init-not-called
-        from diskcache import Index
+        from diskcache import Cache, Index
 
         from dvc.fs.local import LocalFileSystem
         from dvc.utils.fs import makedirs
@@ -96,7 +96,13 @@ class ObjectDBIndex(ObjectDBIndexBase):
         self.index_dir = os.path.join(tmp_dir, self.INDEX_DIR, name)
         makedirs(self.index_dir, exist_ok=True)
         self.fs = LocalFileSystem()
-        self.index = Index(self.index_dir)
+        self.index = Index.fromcache(
+            Cache(
+                self.index_dir,
+                disk_pickle_protocol=4,
+                eviction_policy="none",
+            )
+        )
 
     def __iter__(self):
         return iter(self.index)