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-rw-r--r--synapse/storage/events_worker.py5
-rw-r--r--synapse/storage/stream.py5
2 files changed, 6 insertions, 4 deletions
diff --git a/synapse/storage/events_worker.py b/synapse/storage/events_worker.py
index a937b9bceb..ba834854e1 100644
--- a/synapse/storage/events_worker.py
+++ b/synapse/storage/events_worker.py
@@ -20,7 +20,7 @@ from synapse.events import FrozenEvent
 from synapse.events.utils import prune_event
 
 from synapse.util.logcontext import (
-    preserve_fn, PreserveLoggingContext, make_deferred_yieldable
+    PreserveLoggingContext, make_deferred_yieldable, run_in_background,
 )
 from synapse.util.metrics import Measure
 from synapse.api.errors import SynapseError
@@ -319,7 +319,8 @@ class EventsWorkerStore(SQLBaseStore):
 
         res = yield make_deferred_yieldable(defer.gatherResults(
             [
-                preserve_fn(self._get_event_from_row)(
+                run_in_background(
+                    self._get_event_from_row,
                     row["internal_metadata"], row["json"], row["redacts"],
                     rejected_reason=row["rejects"],
                 )
diff --git a/synapse/storage/stream.py b/synapse/storage/stream.py
index 3b8b539993..4a5481ae53 100644
--- a/synapse/storage/stream.py
+++ b/synapse/storage/stream.py
@@ -41,7 +41,7 @@ from synapse.storage.events import EventsWorkerStore
 from synapse.util.caches.descriptors import cached
 from synapse.types import RoomStreamToken
 from synapse.util.caches.stream_change_cache import StreamChangeCache
-from synapse.util.logcontext import make_deferred_yieldable, preserve_fn
+from synapse.util.logcontext import make_deferred_yieldable, run_in_background
 from synapse.storage.engines import PostgresEngine, Sqlite3Engine
 
 import abc
@@ -198,7 +198,8 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
         room_ids = list(room_ids)
         for rm_ids in (room_ids[i:i + 20] for i in xrange(0, len(room_ids), 20)):
             res = yield make_deferred_yieldable(defer.gatherResults([
-                preserve_fn(self.get_room_events_stream_for_room)(
+                run_in_background(
+                    self.get_room_events_stream_for_room,
                     room_id, from_key, to_key, limit, order=order,
                 )
                 for room_id in rm_ids