osd: Added perf counters for full and incremental maps

Added perf counters to track when OSDs receive full vs incremental OSDMaps.
Useful for debugging  cases where full maps are frequent and could degrade performance.
Changes include updates to OSD.cc, osd_perf_counters.cc/h.

Signed-off-by: Shreya Subramanian <[email protected]>

Author: Shreya Subramanian

src/osd/OSD.cc

@@ -8262,6 +8262,18 @@ void OSD::handle_osd_map(MOSDMap *m)
 	  << dendl;
 
   logger->inc(l_osd_map);
+  if (!m->maps.empty()) {
+    logger->inc(l_osd_full_map_received, m->maps.size());
+  }
+  if (!m->incremental_maps.empty()) {
+    logger->inc(l_osd_inc_map_received, m->incremental_maps.size());
+  }
+  dout(10) << __func__
+           << ": received " << m->maps.size() << " full maps "
+           << "and " << m->incremental_maps.size()
+           << " incremental maps"
+           << dendl;
+
   logger->inc(l_osd_mape, last - first + 1);
   if (first <= superblock.get_newest_map())
     logger->inc(l_osd_mape_dup, superblock.get_newest_map() - first + 1);

src/osd/osd_perf_counters.cc

@@ -246,6 +246,12 @@ PerfCounters *build_osd_logger(CephContext *cct) {
   osd_plb.add_u64(
     l_osd_hb_to, "heartbeat_to_peers", "Heartbeat (ping) peers we send to");
   osd_plb.add_u64_counter(l_osd_map, "map_messages", "OSD map messages");
+  osd_plb.add_u64_counter(
+    l_osd_full_map_received, "full_map_received",
+    "number of full OSD map recieved via MOSDMap");
+  osd_plb.add_u64_counter(
+    l_osd_inc_map_received, "inc_map_received",
+    "number of incremental OSD map recieved via MOSDMap");
   osd_plb.add_u64_counter(l_osd_mape, "map_message_epochs", "OSD map epochs");
   osd_plb.add_u64_counter(
     l_osd_mape_dup, "map_message_epoch_dups", "OSD map duplicates");

src/osd/osd_perf_counters.h

@@ -91,6 +91,8 @@ enum osd_counter_idx_t {
   l_osd_map,
   l_osd_mape,
   l_osd_mape_dup,
+  l_osd_full_map_received,
+  l_osd_inc_map_received,
 
   l_osd_waiting_for_map,