Fixing deadlocks on update_attr_in_bulk_for_ids

taiga/base/utils/db.py

@@ -18,11 +18,10 @@
 
 from django.contrib.contenttypes.models import ContentType
 from django.db import connection
+from django.db import DatabaseError
 from django.db import transaction
 from django.shortcuts import _get_queryset
 
-from django_pglocks import advisory_lock
-
 from . import functions
 
 import re
@@ -101,6 +100,7 @@ def save_in_bulk(instances, callback=None, precall=None, **save_options):
 
     return ret
 
+
 @transaction.atomic
 def update_in_bulk(instances, list_of_new_values, callback=None, precall=None):
     """Update a list of model instances.
@@ -123,6 +123,7 @@ def update_in_bulk(instances, list_of_new_values, callback=None, precall=None):
         callback(instance)
 
 
+@transaction.atomic
 def update_attr_in_bulk_for_ids(values, attr, model):
     """Update a table using a list of ids.
 
@@ -147,7 +148,18 @@ def update_attr_in_bulk_for_ids(values, attr, model):
                attr=attr)
 
     cursor = connection.cursor()
+
+    # We can have deadlocks with multiple updates over the same object
+    # In that situation we just retry
+    def _run_sql(retries=0, max_retries=3):
+        try:
             cursor.execute(sql)
+        except DatabaseError:
+            print("retries", 0)
+            if retries < max_retries:
+                _run_sql(retries + 1)
+
+    transaction.on_commit(_run_sql)
 
 
 def to_tsquery(term):

tests/integration/test_projects.py

@@ -45,7 +45,7 @@ import pytest
 
 from unittest import mock
 
-pytestmark = pytest.mark.django_db
+pytestmark = pytest.mark.django_db(transaction=True)
 
 class ExpiredSigner(signing.TimestampSigner):
     def __init__(self, *args, **kwargs):

tests/integration/test_userstories.py

@@ -33,7 +33,7 @@ from taiga.projects.userstories import services, models
 from .. import factories as f
 
 import pytest
-pytestmark = pytest.mark.django_db
+pytestmark = pytest.mark.django_db(transaction=True)
 
 
 def test_get_userstories_from_bulk():