From a5733a649a59cb525d6eae1a33f33548e2978906 Mon Sep 17 00:00:00 2001
From: Matthew Hodgson <matthew@matrix.org>
Date: Tue, 15 Jan 2019 22:10:44 +0000
Subject: warn if we ignore device lists

---
 synapse/handlers/device.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py
index a93dfd1d63..8955cde4ed 100644
--- a/synapse/handlers/device.py
+++ b/synapse/handlers/device.py
@@ -545,6 +545,10 @@ class DeviceListEduUpdater(object):
                 # up on storing the total list of devices and only handle the
                 # delta instead.
                 if len(devices) > 1000:
+                    logger.warn(
+                        "Ignoring device list snapshot for %s as it has >1K devs (%d)",
+                        user_id, len(devices)
+                    )
                     devices = []
 
                 yield self.store.update_remote_device_list_cache(
-- 
cgit 1.4.1