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-rw-r--r--synapse/storage/background_updates.py24
1 files changed, 22 insertions, 2 deletions
diff --git a/synapse/storage/background_updates.py b/synapse/storage/background_updates.py
index e5f0668f09..80b57a948c 100644
--- a/synapse/storage/background_updates.py
+++ b/synapse/storage/background_updates.py
@@ -140,7 +140,7 @@ class BackgroundUpdateStore(SQLBaseStore):
             "background_updates",
             keyvalues=None,
             retcol="1",
-            desc="check_background_updates",
+            desc="has_completed_background_updates",
         )
         if not updates:
             self._all_done = True
@@ -148,6 +148,26 @@ class BackgroundUpdateStore(SQLBaseStore):
 
         return False
 
+    async def has_completed_background_update(self, update_name) -> bool:
+        """Check if the given background update has finished running.
+        """
+
+        if self._all_done:
+            return True
+
+        if update_name in self._background_update_queue:
+            return False
+
+        update_exists = await self._simple_select_one_onecol(
+            "background_updates",
+            keyvalues={"update_name": update_name},
+            retcol="1",
+            desc="has_completed_background_update",
+            allow_none=True,
+        )
+
+        return not update_exists
+
     @defer.inlineCallbacks
     def do_next_background_update(self, desired_duration_ms):
         """Does some amount of work on the next queued background update
@@ -218,7 +238,7 @@ class BackgroundUpdateStore(SQLBaseStore):
         duration_ms = time_stop - time_start
 
         logger.info(
-            "Updating %r. Updated %r items in %rms."
+            "Running background update %r. Processed %r items in %rms."
             " (total_rate=%r/ms, current_rate=%r/ms, total_updated=%r, batch_size=%r)",
             update_name,
             items_updated,