From a711ae78a8f8ba406ff122035c8bf096fac9a26c Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Wed, 23 Feb 2022 14:22:22 +0000
Subject: [PATCH] Add logging to `/sync` for debugging #11916 (#12068)
---
changelog.d/12068.misc | 1 +
synapse/handlers/sync.py | 9 +++++++++
2 files changed, 10 insertions(+)
create mode 100644 changelog.d/12068.misc
diff --git a/changelog.d/12068.misc b/changelog.d/12068.misc
new file mode 100644
index 0000000000..72b211e4f5
--- /dev/null
+++ b/changelog.d/12068.misc
@@ -0,0 +1 @@
+Add some logging to `/sync` to try and track down #11916.
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index 98eaad3318..0aa3052fd6 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -697,6 +697,15 @@ class SyncHandler:
else:
# no events in this room - so presumably no state
state = {}
+
+ # (erikj) This should be rarely hit, but we've had some reports that
+ # we get more state down gappy syncs than we should, so let's add
+ # some logging.
+ logger.info(
+ "Failed to find any events in room %s at %s",
+ room_id,
+ stream_position.room_key,
+ )
return state
async def compute_summary(
--
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