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: v19.1.0~474^2
X-Git-Url: http://git.apps.os.sepia.ceph.com/?a=commitdiff_plain;h=40e8813e9c705838eee42c98de717b20851aed72;p=ceph.git

PendingReleaseNotes: add rbd_diff_iterate2 note

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index b3fa9b9990e29..0de7e784507bb 100644
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -105,6 +105,11 @@ CephFS: Disallow delegating preallocated inode ranges to clients. Config
   See https://docs.ceph.com/en/latest/rados/operations/balancer/ for more information.
 * CephFS: Full support for subvolumes and subvolume groups is now available
   for snap_schedule Manager module.
+* 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.
 
 >=18.0.0