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-rw-r--r--synapse/storage/_base.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py
index a8f8989e38..c20ff3a572 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -299,6 +299,10 @@ class SQLBaseStore(object):
         self._get_event_cache = Cache("*getEvent*", keylen=3, lru=True,
                                       max_entries=hs.config.event_cache_size)
 
+        self._event_fetch_lock = threading.Lock()
+        self._event_fetch_list = []
+        self._event_fetch_ongoing = False
+
         self.database_engine = hs.database_engine
 
         self._stream_id_gen = StreamIdGenerator()