From 884ca601b21ec6ef4d216ae850c0cf503f762623 Mon Sep 17 00:00:00 2001
From: judeng <abc3844@126.com>
Date: Tue, 3 Jan 2023 15:37:47 +0800
Subject: Optimize the performance of msetnx command by call lookupkey only
 once (#11594)

This is a small addition to #9640
It improves performance by avoiding double lookup of the the key.
---
 src/t_string.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/t_string.c')

diff --git a/src/t_string.c b/src/t_string.c
index 7209b3ba7..125f8ee86 100644
--- a/src/t_string.c
+++ b/src/t_string.c
@@ -553,6 +553,7 @@ void mgetCommand(client *c) {
 
 void msetGenericCommand(client *c, int nx) {
     int j;
+    int setkey_flags = 0;
 
     if ((c->argc % 2) == 0) {
         addReplyErrorArity(c);
@@ -568,11 +569,12 @@ void msetGenericCommand(client *c, int nx) {
                 return;
             }
         }
+        setkey_flags |= SETKEY_DOESNT_EXIST;
     }
 
     for (j = 1; j < c->argc; j += 2) {
         c->argv[j+1] = tryObjectEncoding(c->argv[j+1]);
-        setKey(c,c->db,c->argv[j],c->argv[j+1],0);
+        setKey(c, c->db, c->argv[j], c->argv[j + 1], setkey_flags);
         notifyKeyspaceEvent(NOTIFY_STRING,"set",c->argv[j],c->db->id);
     }
     server.dirty += (c->argc-1)/2;
-- 
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