Merge pull request #892 from rqlite/more-snapshot-metrics

More Snapshot metrics

store/store.go

@@ -71,6 +71,8 @@ const (
 	numRemovedBeforeJoins    = "num_removed_before_joins"
 	snapshotCreateDuration   = "snapshot_create_duration"
 	snapshotPersistDuration  = "snapshot_persist_duration"
+	snapshotDBSerializedSize = "snapshot_db_serialized_size"
+	snapshotDBOnDiskSize     = "snapshot_db_ondisk_size"
 )
 
 // BackupFormat represents the format of database backup.
@@ -99,6 +101,8 @@ func init() {
 	stats.Add(numRemovedBeforeJoins, 0)
 	stats.Add(snapshotCreateDuration, 0)
 	stats.Add(snapshotPersistDuration, 0)
+	stats.Add(snapshotDBSerializedSize, 0)
+	stats.Add(snapshotDBOnDiskSize, 0)
 }
 
 // ClusterState defines the possible Raft states the current node can be in
@@ -1044,6 +1048,7 @@ func (s *Store) Snapshot() (raft.FSMSnapshot, error) {
 	dur := time.Since(fsm.startT)
 	stats.Add(numSnaphots, 1)
 	stats.Get(snapshotCreateDuration).(*expvar.Int).Set(dur.Milliseconds())
+	stats.Get(snapshotDBSerializedSize).(*expvar.Int).Set(int64(len(fsm.database)))
 	s.logger.Printf("node snapshot created in %s", dur)
 	return fsm, nil
 }
@@ -1213,6 +1218,7 @@ func (f *fsmSnapshot) Persist(sink raft.SnapshotSink) error {
 			if _, err := sink.Write(cdb); err != nil {
 				return err
 			}
+			stats.Get(snapshotDBOnDiskSize).(*expvar.Int).Set(int64(len(cdb)))
 		} else {
 			f.logger.Println("no database data available for snapshot")
 			err = writeUint64(b, uint64(0))
@@ -1222,6 +1228,7 @@ func (f *fsmSnapshot) Persist(sink raft.SnapshotSink) error {
 			if _, err := sink.Write(b.Bytes()); err != nil {
 				return err
 			}
+			stats.Get(snapshotDBOnDiskSize).(*expvar.Int).Set(0)
 		}
 
 		// Close the sink.