Temporarily reduce hardcoded task parallelism

Author: Fizzadar

synapse/util/task_scheduler.py

@@ -100,7 +100,7 @@ class TaskScheduler:
     # Time before a complete or failed task is deleted from the DB
     KEEP_TASKS_FOR_MS = 7 * 24 * 60 * 60 * 1000  # 1 week
     # Maximum number of tasks that can run at the same time
-    MAX_CONCURRENT_RUNNING_TASKS = 5
+    MAX_CONCURRENT_RUNNING_TASKS = 1  # Beep: temporarily changed from 5
     # Time from the last task update after which we will log a warning
     LAST_UPDATE_BEFORE_WARNING_MS = 24 * 60 * 60 * 1000  # 24hrs
     # Report a running task's status and usage every so often.