Use bulk option only for initial load of DB

blockbook.go

@@ -344,6 +344,8 @@ func resyncIndex(bulk bool) error {
 		glog.Info("resync: local is behind")
 		hash = header.Next
 		startHeight = localBestHeight
+		// bulk load is allowed only for empty db, otherwise we could get rocksdb "error db has more levels than options.num_levels"
+		bulk = false
 	} else {
 		// If the local block is missing, we're indexing from the genesis block
 		// or from the start block specified by flags
@@ -359,7 +361,7 @@ func resyncIndex(bulk bool) error {
 
 	// if parallel operation is enabled and the number of blocks to be connected is large,
 	// use parallel routine to load majority of blocks
-	if bulk && *syncWorkers > 1 {
+	if *syncWorkers > 1 {
 		chainBestHeight, err := chain.GetBestBlockHeight()
 		if err != nil {
 			return err
@@ -370,6 +372,7 @@ func resyncIndex(bulk bool) error {
 				startHeight,
 				chainBestHeight,
 				*syncWorkers,
+				bulk,
 			)
 			if err != nil {
 				return err
@@ -415,11 +418,15 @@ func connectBlocksParallel(
 	lower uint32,
 	higher uint32,
 	numWorkers int,
+	bulk bool,
 ) error {
-	err := index.ReopenWithBulk(true)
+	var err error
+	if bulk {
+		err = index.ReopenWithBulk(true)
 		if err != nil {
 			return err
 		}
+	}
 
 	var wg sync.WaitGroup
 	hch := make(chan string, numWorkers)
@@ -459,6 +466,7 @@ func connectBlocksParallel(
 		hch <- hash
 		if h > 0 && h%1000 == 0 {
 			glog.Info("connecting block ", h, " ", hash)
+			if bulk {
 				if h%50000 == 0 {
 					// wait for the workers to finish block
 				WaitAgain:
@@ -472,16 +480,17 @@ func connectBlocksParallel(
 						}
 						break
 					}
-				if err = index.CompactDatabase(true); err != nil {
+					if err = index.CompactDatabase(bulk); err != nil {
 						break
 					}
 				}
 			}
 		}
+	}
 	close(hch)
 	wg.Wait()
 
-	if err == nil {
+	if err == nil && bulk {
 		err = index.ReopenWithBulk(false)
 	}