diff --git a/synapse/storage/util/id_generators.py b/synapse/storage/util/id_generators.py
index 76bc3afdfa..b7eb4f8ac9 100644
--- a/synapse/storage/util/id_generators.py
+++ b/synapse/storage/util/id_generators.py
@@ -15,6 +15,7 @@
import contextlib
import heapq
+import logging
import threading
from collections import deque
from typing import Dict, List, Set
@@ -24,6 +25,8 @@ from typing_extensions import Deque
from synapse.storage.database import DatabasePool, LoggingTransaction
from synapse.storage.util.sequence import PostgresSequenceGenerator
+logger = logging.getLogger(__name__)
+
class IdGenerator:
def __init__(self, db_conn, table, column):
@@ -48,6 +51,8 @@ def _load_current_id(db_conn, table, column, step=1):
Returns:
int
"""
+ # debug logging for https://github.com/matrix-org/synapse/issues/7968
+ logger.info("initialising stream generator for %s(%s)", table, column)
cur = db_conn.cursor()
if step == 1:
cur.execute("SELECT MAX(%s) FROM %s" % (column, table))
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