mds: only dump past_parent_snap if non-empty

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
(cherry picked from commit b1a169b4f319c92ed0e57f68e224572fb509619c)

diff --git a/src/mds/SnapRealm.cc b/src/mds/SnapRealm.cc
index 09ddd9181edb65ebea9d8ac18e4d6571d7f0c376..a93da3e98b778529ba3acd382150edfd8095582e 100644 (file)
--- a/src/mds/SnapRealm.cc
+++ b/src/mds/SnapRealm.cc
@@ -44,7 +44,9 @@ ostream& operator<<(ostream& out, const SnapRealm& realm)
   if (realm.srnode.created != realm.srnode.current_parent_since)
     out << " cps " << realm.srnode.current_parent_since;
   out << " snaps=" << realm.srnode.snaps;
-  out << " past_parent_snaps=" << realm.srnode.past_parent_snaps;
+  if (realm.srnode.past_parent_snaps.size() > 0) {
+    out << " past_parent_snaps=" << realm.srnode.past_parent_snaps;
+  }
 
   if (realm.srnode.is_parent_global())
     out << " global ";