Add max-background-jobs rocksdb option (#1708) (#1716)

(cherry picked from commit 3c8394f)

Co-authored-by: Evgeniy Scherbina <evgeniy.shcherbina.es@gmail.com>

cmd/kava/opendb/opendb_rocksdb.go

@@ -55,6 +55,7 @@ const (
 	useFsyncDBOptName               = "rocksdb.use_fsync"
 	useAdaptiveMutexDBOptName       = "rocksdb.use_adaptive_mutex"
 	bytesPerSyncDBOptName           = "rocksdb.bytes_per_sync"
+	maxBackgroundJobsDBOptName      = "rocksdb.max-background-jobs"
 
 	writeBufferSizeCFOptName                = "rocksdb.write-buffer-size"
 	numLevelsCFOptName                      = "rocksdb.num-levels"
@@ -173,6 +174,11 @@ func overrideDBOpts(dbOpts *grocksdb.Options, appOpts types.AppOptions) *grocksd
 		dbOpts.SetBytesPerSync(cast.ToUint64(bytesPerSync))
 	}
 
+	maxBackgroundJobs := appOpts.Get(maxBackgroundJobsDBOptName)
+	if maxBackgroundJobs != nil {
+		dbOpts.SetMaxBackgroundJobs(cast.ToInt(maxBackgroundJobs))
+	}
+
 	return dbOpts
 }