Added logs in MultiWriterIdGenerator.__init__() and get_cache_dict.

synapse/storage/database.py

@@ -2395,6 +2395,7 @@ class DatabasePool:
             min_val = min(cache.values()) + 1
         else:
             min_val = max_value
+        logger.debug("Calling get_cache_dict %s: %s", table, sql)
 
         return cache, min_val
 

synapse/storage/util/id_generators.py

@@ -432,7 +432,10 @@ class MultiWriterIdGenerator(AbstractStreamIdGenerator):
             # write to the stream. In which case, let's pre-seed our own
             # position with the current minimum.
             self._current_positions[self._instance_name] = self._persisted_upto_position
-
+        
+        table_string = "\n".join(", ".join(row) for row in tables)
+        logger.debug(f"{table_string}")
+ 
     def _load_current_ids(
         self,
         db_conn: LoggingDatabaseConnection,