diff --git a/vcsserver/lib/rc_cache/archive_cache.py b/vcsserver/lib/rc_cache/archive_cache.py
--- a/vcsserver/lib/rc_cache/archive_cache.py
+++ b/vcsserver/lib/rc_cache/archive_cache.py
@@ -18,13 +18,28 @@
 import logging
 import os
 import diskcache
+from diskcache import RLock
 
 log = logging.getLogger(__name__)
 
 cache_meta = None
 
 
+class ReentrantLock(RLock):
+    def __enter__(self):
+        reentrant_lock_key = self._key
+
+        log.debug('Acquire ReentrantLock(key=%s) for archive cache generation...', reentrant_lock_key)
+        #self.acquire()
+        log.debug('Lock for key=%s acquired', reentrant_lock_key)
+
+    def __exit__(self, *exc_info):
+        #self.release()
+        pass
+
+
 def get_archival_config(config):
+
     final_config = {
         'archive_cache.eviction_policy': 'least-frequently-used'
     }
diff --git a/vcsserver/lib/rc_cache/utils.py b/vcsserver/lib/rc_cache/utils.py
--- a/vcsserver/lib/rc_cache/utils.py
+++ b/vcsserver/lib/rc_cache/utils.py
@@ -24,10 +24,12 @@ import time
 import decorator
 from dogpile.cache import CacheRegion
 
-from vcsserver.lib.rc_cache import region_meta
+
+from vcsserver.utils import sha1
 from vcsserver.str_utils import safe_bytes
 from vcsserver.type_utils import str2bool
-from vcsserver.utils import sha1
+
+from . import region_meta
 
 log = logging.getLogger(__name__)
 
@@ -164,8 +166,9 @@ def backend_key_generator(backend):
     return wrapper
 
 
-def get_or_create_region(region_name, region_namespace: str = None):
-    from vcsserver.lib.rc_cache.backends import FileNamespaceBackend
+def get_or_create_region(region_name, region_namespace: str = None, use_async_runner=False):
+    from .backends import FileNamespaceBackend
+    from . import async_creation_runner
 
     region_obj = region_meta.dogpile_cache_regions.get(region_name)
     if not region_obj:
@@ -215,6 +218,8 @@ def get_or_create_region(region_name, re
         region_obj = region_meta.dogpile_cache_regions[region_namespace] = new_region
 
     region_obj._default_namespace = region_namespace
+    if use_async_runner:
+        region_obj.async_creation_runner = async_creation_runner
     return region_obj