From 611511d4fd3478d45f4fa1bd34f623c81b3d2ba3 Mon Sep 17 00:00:00 2001
From: Przemyslaw Skibinski <przemyslaw.skibinski@percona.com>
Date: Fri, 27 May 2022 11:57:54 +0200
Subject: [PATCH] PS-7809: Add backward compatibilty after removing
 rdb_comparator and using RocksDB::BytewiseComparator instead

---
 db/version_edit_handler.cc | 4 ++++
 options/options_parser.cc  | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/db/version_edit_handler.cc b/db/version_edit_handler.cc
index 90afc0938c9e..6fab256c590d 100644
--- a/db/version_edit_handler.cc
+++ b/db/version_edit_handler.cc
@@ -212,6 +212,10 @@ Status VersionEditHandler::ApplyVersionEdit(VersionEdit& edit,
   }
   if (s.ok()) {
     assert(cfd != nullptr);
+    if (edit.comparator_ == "RocksDB_SE_v3.10")
+      edit.comparator_ = "leveldb.BytewiseComparator";
+    if (edit.comparator_ == "rev:RocksDB_SE_v3.10")
+      edit.comparator_ = "rocksdb.ReverseBytewiseComparator";
     s = ExtractInfoFromVersionEdit(*cfd, edit);
   }
   return s;
diff --git a/options/options_parser.cc b/options/options_parser.cc
index e2431016d1dc..c889f1109cbd 100644
--- a/options/options_parser.cc
+++ b/options/options_parser.cc
@@ -306,6 +306,11 @@ Status RocksDBOptionsParser::Parse(const ConfigOptions& config_options_in,
       if (!s.ok()) {
         return s;
       }
+      if (name == "comparator") {
+        if (value == "RocksDB_SE_v3.10") value = "leveldb.BytewiseComparator";
+        if (value == "rev:RocksDB_SE_v3.10")
+          value = "rocksdb.ReverseBytewiseComparator";
+      }
       opt_map.insert({name, value});
     }
   }