From eb3711b88156019908d99f3e08393f4c8a04f8b0 Mon Sep 17 00:00:00 2001
From: Joonas Koivunen <joonas@neon.tech>
Date: Fri, 26 Jul 2024 08:18:17 +0000
Subject: [PATCH] doc: why no cancel

---
 pageserver/src/tenant/timeline/detach_ancestor.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pageserver/src/tenant/timeline/detach_ancestor.rs b/pageserver/src/tenant/timeline/detach_ancestor.rs
index b3c078312e..4fd6e054b2 100644
--- a/pageserver/src/tenant/timeline/detach_ancestor.rs
+++ b/pageserver/src/tenant/timeline/detach_ancestor.rs
@@ -302,6 +302,8 @@ impl SharedState {
             .get(&attempt.timeline_id)
             .cloned()
         else {
+            // no need to cancel the attempt, because timeline deletion and/or tenant restart has
+            // already marked it unblocked.
             return Err(Error::DetachedNotFoundAfterRestart);
         };