Comment on null deleteUUID

DaveCTurner · DaveCTurner · commit 6bcaead4eeaf · 2026-02-10T09:41:25.000Z
diff --git a/server/src/main/java/org/elasticsearch/snapshots/SnapshotsService.java b/server/src/main/java/org/elasticsearch/snapshots/SnapshotsService.java
@@ -1545,6 +1545,8 @@ private void notifyAbortedByDeletion(Snapshot snapshot) {
 
     private void completeOrAddDeleteListener(@Nullable String deleteUUID, ActionListener<Void> listener) {
         if (deleteUUID == null) {
+            // if the deletion only aborted snapshots that had not started to write to the repository then no cleanup is required, these
+            // snapshots have already been removed from the cluster state, and hence we can complete the listener immediately:
             listener.onResponse(null);
         } else {
             snapshotDeletionListeners.computeIfAbsent(deleteUUID, k -> new CopyOnWriteArrayList<>())
