Move retention purge_jobs running to the main worker

Author: bradtgmurray

synapse/handlers/pagination.py

@@ -163,11 +163,9 @@ def __init__(self, hs: "HomeServer"):
         self._retention_allowed_lifetime_max = (
             hs.config.retention.retention_allowed_lifetime_max
         )
+        self._is_master = hs.config.worker.worker_app is None
 
-        if (
-            hs.config.worker.run_background_tasks
-            and hs.config.retention.retention_enabled
-        ):
+        if hs.config.retention.retention_enabled and self._is_master:
             # Run the purge jobs described in the configuration file.
             for job in hs.config.retention.retention_purge_jobs:
                 logger.info("Setting up purge job with config: %s", job)