#35672 closed Bug (invalid)
Using database connection pooling, threads do not return the connection
Reported by: | André S. Hansen | Owned by: | |
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Component: | Database layer (models, ORM) | Version: | 5.1 |
Severity: | Normal | Keywords: | |
Cc: | Florian Apolloner | Triage Stage: | Unreviewed |
Has patch: | no | Needs documentation: | no |
Needs tests: | no | Patch needs improvement: | no |
Easy pickings: | no | UI/UX: | no |
Description (last modified by )
I am testing the new db connection pooling, which increased the performance greatly, typically lowering api response times from 30ms -> 20ms on my dev env.
However, after a while i started getting
psycopg_pool.PoolTimeout : couldn't get a connection after 30.00 sec
Further investigation shows the reason was a Threaded Middleware orm interaction, like this simplified code. My theory is that the thread request and receives a connection from the pool, but do not return it.
class TimeMonitorMiddleware(object): batched_logs: List[RequestLog] = [] def __call__(self, request: WSGIRequest) -> HttpResponse: # ... # Save batched logs if len(self.batched_logs) >= 50: Thread(target=RequestLog.objects.bulk_create, args=(batched_logs,)).start() return response
Using settings
{ "ENGINE": os.environ.get("DB_ENGINE", "django.db.backends.postgresql"), "OPTIONS": {"pool": True} }
Extra info:
- Python 3.12.1
- Django 5.1
- psycopg 3.2.1
- psycopg-pool 3.2.2
- Local docker image hosted postgresql database using image "postgres"
Change History (16)
comment:1 by , 3 months ago
Description: | modified (diff) |
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comment:2 by , 3 months ago
Cc: | added |
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Resolution: | → needsinfo |
Status: | new → closed |
comment:3 by , 3 months ago
Hi André, it would probably help if you enabled the psycopg.pool
logger and then check if the connections are returned to the pool properly. Also what is your request rate and how long are the requests taking? How are you running the django server? What are the postgresql connection limits?
comment:4 by , 3 months ago
I did some more testing and figured out the source of the problem. When i disabled a Middleware Threaded connection to the database, the bug stopped happening. My current theory is that the thread dont return the connection to the pool. I am investigating now how i should properly do this with Threads.
Simplified version of code
class TimeMonitorMiddleware(object): batched_logs: List[RequestLog] = [] def __call__(self, request: WSGIRequest) -> HttpResponse: # ... # Save batched logs if len(self.batched_logs) >= 50: Thread(target=RequestLog.objects.bulk_create, args=(batched_logs,)).start() return response
comment:5 by , 3 months ago
Summary: | Using database connection pooling raises PoolTimeout after a while → Using database connection pooling with threads raises PoolTimeout after a while |
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comment:6 by , 3 months ago
Summary: | Using database connection pooling with threads raises PoolTimeout after a while → Using database connection pooling, threads do not return the connection |
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comment:7 by , 3 months ago
Description: | modified (diff) |
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Resolution: | needsinfo |
Status: | closed → new |
comment:8 by , 3 months ago
Description: | modified (diff) |
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comment:9 by , 3 months ago
Description: | modified (diff) |
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Example error logs
Logs
[13/Aug/2024 00:50:41] "POST /api/instances/2/actions/move/ HTTP/1.1" 200 91 couldn't get a connection after 30.00 sec Traceback (most recent call last): File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 279, in ensure_connection self.connect() File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\asyncio.py", line 26, in inner return func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 256, in connect self.connection = self.get_new_connection(conn_params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\asyncio.py", line 26, in inner return func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\postgresql\base.py", line 348, in get_new_connection connection = self.pool.getconn() ^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\psycopg_pool\pool.py", line 202, in getconn raise PoolTimeout( psycopg_pool.PoolTimeout: couldn't get a connection after 30.00 sec The above exception was the direct cause of the following exception: Traceback (most recent call last): File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\ninja\operation.py", line 192, in _run_authentication result = callback(request) ^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\ninja\security\apikey.py", line 23, in __call__ return self.authenticate(request, key) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\ninja\security\session.py", line 17, in authenticate if request.user.is_authenticated: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\functional.py", line 251, in inner self._setup() File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\functional.py", line 404, in _setup self._wrapped = self._setupfunc() ^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\auth\middleware.py", line 37, in <lambda> request.user = SimpleLazyObject(lambda: get_user(request)) ^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\auth\middleware.py", line 17, in get_user request._cached_user = auth.get_user(request) ^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\auth\__init__.py", line 209, in get_user user_id = _get_user_session_key(request) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\auth\__init__.py", line 62, in _get_user_session_key return get_user_model()._meta.pk.to_python(request.session[SESSION_KEY]) ~~~~~~~~~~~~~~~^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\sessions\backends\base.py", line 55, in __getitem__ return self._session[key] ^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\sessions\backends\base.py", line 249, in _get_session self._session_cache = self.load() ^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\sessions\backends\db.py", line 55, in load s = self._get_session_from_db() ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\sessions\backends\db.py", line 34, in _get_session_from_db return self.model.objects.get( ^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\models\manager.py", line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\models\query.py", line 645, in get num = len(clone) ^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\models\query.py", line 382, in __len__ self._fetch_all() File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\models\query.py", line 1928, in _fetch_all self._result_cache = list(self._iterable_class(self)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\models\query.py", line 91, in __iter__ results = compiler.execute_sql( ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\cachalot\monkey_patch.py", line 37, in inner return original(compiler, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\cachalot\monkey_patch.py", line 94, in inner return execute_query_func() ^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\cachalot\monkey_patch.py", line 80, in <lambda> execute_query_func = lambda: original(compiler, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\models\sql\compiler.py", line 1572, in execute_sql cursor = self.connection.cursor() ^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\asyncio.py", line 26, in inner return func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 320, in cursor return self._cursor() ^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 296, in _cursor self.ensure_connection() File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\asyncio.py", line 26, in inner return func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 278, in ensure_connection with self.wrap_database_errors: File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\utils.py", line 91, in __exit__ raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 279, in ensure_connection self.connect() File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\asyncio.py", line 26, in inner return func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 256, in connect self.connection = self.get_new_connection(conn_params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\asyncio.py", line 26, in inner return func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\postgresql\base.py", line 348, in get_new_connection connection = self.pool.getconn() ^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\psycopg_pool\pool.py", line 202, in getconn raise PoolTimeout( django.db.utils.OperationalError: couldn't get a connection after 30.00 sec Internal Server Error: /api/instances/2/actions/move/ Traceback (most recent call last): File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 279, in ensure_connection self.connect() File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\asyncio.py", line 26, in inner return func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 256, in connect self.connection = self.get_new_connection(conn_params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\asyncio.py", line 26, in inner return func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\postgresql\base.py", line 348, in get_new_connection connection = self.pool.getconn() ^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\psycopg_pool\pool.py", line 202, in getconn raise PoolTimeout( psycopg_pool.PoolTimeout: couldn't get a connection after 30.00 sec The above exception was the direct cause of the following exception: Traceback (most recent call last): File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\core\handlers\exception.py", line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Repos\untitledgame\backend\monitor\middleware.py", line 35, in __call__ user_id=user_id_or_none(request.user), ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Repos\untitledgame\backend\game\api\utils.py", line 9, in user_id_or_none if isinstance(user, AnonymousUser): ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\functional.py", line 280, in __getattribute__ value = super().__getattribute__(name) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\functional.py", line 251, in inner self._setup() File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\functional.py", line 404, in _setup self._wrapped = self._setupfunc() ^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\auth\middleware.py", line 37, in <lambda> request.user = SimpleLazyObject(lambda: get_user(request)) ^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\auth\middleware.py", line 17, in get_user request._cached_user = auth.get_user(request) ^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\auth\__init__.py", line 209, in get_user user_id = _get_user_session_key(request) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\auth\__init__.py", line 62, in _get_user_session_key return get_user_model()._meta.pk.to_python(request.session[SESSION_KEY]) ~~~~~~~~~~~~~~~^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\sessions\backends\base.py", line 55, in __getitem__ return self._session[key] ^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\sessions\backends\base.py", line 249, in _get_session self._session_cache = self.load() ^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\sessions\backends\db.py", line 55, in load s = self._get_session_from_db() ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\contrib\sessions\backends\db.py", line 34, in _get_session_from_db return self.model.objects.get( ^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\models\manager.py", line 87, in manager_method return getattr(self.get_queryset(), name)(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\models\query.py", line 645, in get num = len(clone) ^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\models\query.py", line 382, in __len__ self._fetch_all() File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\models\query.py", line 1928, in _fetch_all self._result_cache = list(self._iterable_class(self)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\models\query.py", line 91, in __iter__ results = compiler.execute_sql( ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\cachalot\monkey_patch.py", line 37, in inner return original(compiler, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\cachalot\monkey_patch.py", line 94, in inner return execute_query_func() ^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\cachalot\monkey_patch.py", line 80, in <lambda> execute_query_func = lambda: original(compiler, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\models\sql\compiler.py", line 1572, in execute_sql cursor = self.connection.cursor() ^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\asyncio.py", line 26, in inner return func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 320, in cursor return self._cursor() ^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 296, in _cursor self.ensure_connection() File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\asyncio.py", line 26, in inner return func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 278, in ensure_connection with self.wrap_database_errors: File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\utils.py", line 91, in __exit__ raise dj_exc_value.with_traceback(traceback) from exc_value File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 279, in ensure_connection self.connect() File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\asyncio.py", line 26, in inner return func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\base\base.py", line 256, in connect self.connection = self.get_new_connection(conn_params) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\utils\asyncio.py", line 26, in inner return func(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\django\db\backends\postgresql\base.py", line 348, in get_new_connection connection = self.pool.getconn() ^^^^^^^^^^^^^^^^^^^ File "C:\Users\andre\.virtualenvs\backend-jnn8gBG-\Lib\site-packages\psycopg_pool\pool.py", line 202, in getconn raise PoolTimeout( django.db.utils.OperationalError: couldn't get a connection after 30.00 sec [13/Aug/2024 00:56:42] "POST /api/instances/2/actions/move/ HTTP/1.1" 500 235606
comment:10 by , 3 months ago
I edited the ticket with the threaded point, and reopened. I hope this is ok.
comment:11 by , 3 months ago
Description: | modified (diff) |
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comment:12 by , 3 months ago
Hi André, I think this might be intended behavior. You need to close connections. During a request cycle Django does it for you. But stuff like celery etc also have to manually close connections. I assume your code was working before without the pool? What was the configuration then? Especially did you have persistent connections enabled? If yes I think you'd see the same behavior there.
comment:13 by , 3 months ago
Addendum to the comment before: The behavior before should have been the same with and without persistent connections. Though I might have an idea why you might not have seen this before (I am just guessing though, I don't know the details of our thread local implementations out of my head). Before thread ids might have gotten reused, so while you were leaking connections as well other requests might have spawned with the same thread id. Now with the pool it is very important that you close the connection at the end of your code to return it.
comment:14 by , 3 months ago
Thanks for considering my case, and your questions and input, it helped push me toward the solution.
I assume your code was working before without the pool?
Yes
What was the configuration then? Especially did you have persistent connections enabled?
I did not specify CONN_MAX_AGE, meaning i had persistent connections disabled.
---
After an hour of googling and testing I found a decent solution:
from django.db import connection class TestThread(Thread): def run(self) -> None: super().run() connection.close() TestThread(target=RequestLog.objects.bulk_create, args=(batched_logs,)).start()
The documentation https://docs.djangoproject.com/en/5.1/ref/databases/ could do well addressing this case. But i guess you can close this ticket.
comment:15 by , 3 months ago
Resolution: | → invalid |
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Status: | new → closed |
Ok, I will close this as invalid then.
The documentation https://docs.djangoproject.com/en/5.1/ref/databases/ could do well addressing this case. But i guess you can close this ticket.
Don't the caveats in https://docs.djangoproject.com/en/5.1/ref/databases/#caveats mention your case exactly:
If a connection is created in a long-running process, outside of Django’s request-response cycle, the connection will remain open until explicitly closed, or timeout occurs. You can use django.db.close_old_connections() to close all old or unusable connections.
If you can think of a better wording please open a PR; we don't need tickets for doc improvements usually.
comment:16 by , 3 months ago
Hehe, I'd be damned, I scanned that document twice, embarrassing.
Made a little PR here: https://github.com/django/django/pull/18495
Hi Andre, I think we need more information to understand whether/where Django is at fault here
I believe you have this error because the connection pool is full, this could mean that Django is not closing connections after using them. For us to be able to identify where this is happening, can you share a minimal Django project and steps to reproduce?