1 files changed, 24 insertions, 0 deletions
diff --git a/src/rocksdb/include/rocksdb/utilities/option_change_migration.h b/src/rocksdb/include/rocksdb/utilities/option_change_migration.h
new file mode 100644
index 000000000..a73324a9e
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+++ b/src/rocksdb/include/rocksdb/utilities/option_change_migration.h
@@ -0,0 +1,24 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#pragma once
+
+#include <string>
+
+#include "rocksdb/options.h"
+#include "rocksdb/status.h"
+
+namespace ROCKSDB_NAMESPACE {
+// Try to migrate DB created with old_opts to be use new_opts.
+// Multiple column families is not supported.
+// It is best-effort. No guarantee to succeed.
+// A full compaction may be executed.
+// If the target options use FIFO compaction, the FIFO condition might be
+// sacrificed: for data migrated, data inserted later might be dropped
+// earlier. This is to gurantee FIFO compaction won't drop all the
+// migrated data to fit max_table_files_size.
+Status OptionChangeMigration(std::string dbname, const Options& old_opts,
+                             const Options& new_opts);
+}  // namespace ROCKSDB_NAMESPACE