html_url,issue_url,id,node_id,user,user_label,created_at,updated_at,author_association,body,reactions,issue,issue_label,performed_via_github_app
https://github.com/simonw/datasette/issues/1231#issuecomment-781560989,https://api.github.com/repos/simonw/datasette/issues/1231,781560989,MDEyOklzc3VlQ29tbWVudDc4MTU2MDk4OQ==,9599,simonw,2021-02-18T18:50:53Z,2021-02-18T18:50:53Z,OWNER,Ideally I'd figure out a way to replicate this error in a concurrent unit test.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",811367257,Race condition errors in new refresh_schemas() mechanism,
https://github.com/simonw/datasette/issues/1231#issuecomment-781560865,https://api.github.com/repos/simonw/datasette/issues/1231,781560865,MDEyOklzc3VlQ29tbWVudDc4MTU2MDg2NQ==,9599,simonw,2021-02-18T18:50:38Z,2021-02-18T18:50:38Z,OWNER,"I started trying to use locks to resolve this but I've not figured out the right way to do that yet - here's my first experiment:
```diff
diff --git a/datasette/app.py b/datasette/app.py
index 9e15a16..1681c9d 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -217,6 +217,7 @@ class Datasette:
         self.inspect_data = inspect_data
         self.immutables = set(immutables or [])
         self.databases = collections.OrderedDict()
+        self._refresh_schemas_lock = threading.Lock()
         if memory or not self.files:
             self.add_database(Database(self, is_memory=True), name=""_memory"")
         # memory_name is a random string so that each Datasette instance gets its own
@@ -324,6 +325,13 @@ class Datasette:
         self.client = DatasetteClient(self)
 
     async def refresh_schemas(self):
+        return
+        if self._refresh_schemas_lock.locked():
+            return
+        with self._refresh_schemas_lock:
+            await self._refresh_schemas()
+
+    async def _refresh_schemas(self):
         internal_db = self.databases[""_internal""]
         if not self.internal_db_created:
             await init_internal_db(internal_db)
```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",811367257,Race condition errors in new refresh_schemas() mechanism,