PendingReleaseNotes: add note about `bluestore_zero_block_detection` config option

Signed-off-by: Laura Flores <lflores@redhat.com>

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index 19833faafcbf3bc13d28878b812f30e4e7bb860b..69226a01ec0be462a65f840c3d7678f12cc133bb 100644 (file)
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -43,3 +43,13 @@
   * system
   * truncated
   * user_stats_sync
+
+>=17.2.1
+
+* The "BlueStore zero block detection" feature (first introduced to Quincy in
+https://github.com/ceph/ceph/pull/43337) has been turned off by default with a
+new global configuration called `bluestore_zero_block_detection`. This feature,
+intended for large-scale synthetic testing, does not interact well with some RBD
+and CephFS features. Any side effects experienced in previous Quincy versions
+would no longer occur, provided that the configuration remains set to false.
+Relevant tracker: https://tracker.ceph.com/issues/55521