From c859c97ee25d7beb40697540fa067cf55d54f238 Mon Sep 17 00:00:00 2001
From: Gyu-Ho Lee <gyuhox@gmail.com>
Date: Fri, 7 Oct 2016 14:19:59 -0700
Subject: [PATCH] mvccpb: add 'prev_kv' field

---
 mvcc/mvccpb/kv.proto | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mvcc/mvccpb/kv.proto b/mvcc/mvccpb/kv.proto
index f0c82b57c..f150d26c7 100644
--- a/mvcc/mvccpb/kv.proto
+++ b/mvcc/mvccpb/kv.proto
@@ -43,4 +43,6 @@ message Event {
   // A DELETE/EXPIRE event contains the deleted key with
   // its modification revision set to the revision of deletion.
   KeyValue kv = 2;
+  // prev_kv holds the key-value pair before the event happens.
+  KeyValue prev_kv = 3;
 }