From: Ilya Dryomov <idryomov@gmail.com>
Date: Sat, 20 Jan 2024 15:00:46 +0000 (+0100)
Subject: PendingReleaseNotes: add rbd_diff_iterate2 note
X-Git-Tag: v18.2.4~277^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=79b10f684869c447ed267d5343b7214476761dd4;p=ceph.git

PendingReleaseNotes: add rbd_diff_iterate2 note

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
(cherry picked from commit 40e8813e9c705838eee42c98de717b20851aed72)

Conflicts:
	PendingReleaseNotes [ moved to >=18.2.2 section ]
---

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index 7526f34f194a..d7a8ed26d25b 100644
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -1,3 +1,12 @@
+>=18.2.2
+--------
+
+* RBD: When diffing against the beginning of time (`fromsnapname == NULL`) in
+  fast-diff mode (`whole_object == true` with `fast-diff` image feature enabled
+  and valid), diff-iterate is now guaranteed to execute locally if exclusive
+  lock is available.  This brings a dramatic performance improvement for QEMU
+  live disk synchronization and backup use cases.
+
 >=19.0.0
 
 * The cephfs-shell utility is now packaged for RHEL 9 / CentOS 9 as required