ceph-objectstore-tool: update-mon-db: do not fail if incmap is missing

there is chance that we could use an OSD which does not have incmap of a
certain epoch for rebuilding the monstore. and since OSD does not read
and store the incmap if the MOSDMap message already has the fullmap of
that fullmap, and if an OSD does not have previous fullmap, monitor
will just send it the fullmao. so it's not unusual that an OSD has
a fullmap of some epoch without corresponding incmap.

Fixes: https://tracker.ceph.com/issues/41177
Signed-off-by: Kefu Chai <kchai@redhat.com>
(cherry picked from commit 2e2414b3df97b22ccc54500830c24b28597ce75f)

diff --git a/src/tools/rebuild_mondb.cc b/src/tools/rebuild_mondb.cc
index 7704bd2507b0391e8ae60a4f02d78a776dbc62d7..aa4b7746905b6e34a705020b3751cc5f8b00f267 100644 (file)
--- a/src/tools/rebuild_mondb.cc
+++ b/src/tools/rebuild_mondb.cc
@@ -244,13 +244,13 @@ int update_osdmap(ObjectStore& fs, OSDSuperblock& sb, MonitorDBStore& ms)
     uint32_t crc = -1;
     uint64_t features = 0;
     // add inc maps
-    {
+    auto add_inc_result = [&] {
       const auto oid = OSD::get_inc_osdmap_pobject_name(e);
       bufferlist bl;
       int nread = fs.read(ch, oid, 0, 0, bl);
       if (nread <= 0) {
-        cerr << "missing " << oid << std::endl;
-        return -EINVAL;
+        cout << "missing " << oid << std::endl;
+        return -ENOENT;
       }
       t->put(prefix, e, bl);
 
@@ -277,6 +277,17 @@ int update_osdmap(ObjectStore& fs, OSDSuperblock& sb, MonitorDBStore& ms)
           // inc.decode() verifies `inc_crc`, so it's been taken care of.
         }
       }
+    }();
+    switch (add_inc_result) {
+    case -ENOENT:
+      // no worries, we always have full map
+      break;
+    case -EINVAL:
+      return -EINVAL;
+    case 0:
+      break;
+    default:
+      assert(0);
     }
     // add full maps
     {