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authorErik Johnston <erik@matrix.org>2017-05-03 10:00:29 +0100
committerErik Johnston <erik@matrix.org>2017-05-03 10:00:29 +0100
commit2c2dcf81d03fabfe4a018b60b4b840069627b3fe (patch)
treed9952fa321a38e9bd7c2991e9770084f974b5f97 /synapse/storage/state.py
parentComments (diff)
downloadsynapse-2c2dcf81d03fabfe4a018b60b4b840069627b3fe.tar.xz
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-rw-r--r--synapse/storage/state.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index 5d6f7dfa28..03981f5d2b 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -229,7 +229,8 @@ class StateStore(SQLBaseStore):
 
             # Prefill the state group cache with this group.
             # It's fine to use the sequence like this as the state group map
-            # is immutable.
+            # is immutable. (If the map wasn't immutable then this prefill could
+            # race with another update)
             txn.call_after(
                 self._state_group_cache.update,
                 self._state_group_cache.sequence,