From: Matan Breizman <mbreizma@redhat.com>
Date: Mon, 25 Mar 2024 13:17:43 +0000 (+0000)
Subject: osd/OSD: Add pg_num_history comment
X-Git-Tag: v20.0.0~1488^2~1
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=ddd741b393f16bdc0389d1b6d9fb1d4078b4e524;p=ceph.git

osd/OSD: Add pg_num_history comment

Signed-off-by: Matan Breizman <mbreizma@redhat.com>
---

diff --git a/src/osd/OSD.h b/src/osd/OSD.h
index e5f3510e2a5..1ad1b509fc1 100644
--- a/src/osd/OSD.h
+++ b/src/osd/OSD.h
@@ -1666,6 +1666,12 @@ protected:
     return osdmap ? osdmap->get_epoch() : 0;
   }
 
+  /* When handling OSDMaps pg_num_history is used to
+   * track any changes to number of PGs of each pool
+   * to be used later in order to identify PG splits and merges.
+   * See: OSD::track_pools_and_pg_num_changes
+   *      and OSDService::identify_splits_and_merges.
+   */
   pool_pg_num_history_t pg_num_history;
 
   ceph::shared_mutex map_lock = ceph::make_shared_mutex("OSD::map_lock");