From 2290c4bee1904d4418fd1fa9192a3fbc13bf38b0 Mon Sep 17 00:00:00 2001
From: "zhaozhao.zz" <zhaozhao.zz@alibaba-inc.com>
Date: Mon, 3 Sep 2018 14:36:48 +0800
Subject: [PATCH] if master is already unblocked, do not unblock it twice

---
 src/scripting.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/scripting.c b/src/scripting.c
index 4b36a085..6c311dbe 100644
--- a/src/scripting.c
+++ b/src/scripting.c
@@ -1367,7 +1367,7 @@ void evalGenericCommand(client *c, int evalsha) {
          * script timeout was detected. */
         aeCreateFileEvent(server.el,c->fd,AE_READABLE,
                           readQueryFromClient,c);
-        if (server.masterhost && server.master) {
+        if (server.masterhost && server.master && !(server.master->flags & CLIENT_UNBLOCKED)) {
             server.master->flags |= CLIENT_UNBLOCKED;
             listAddNodeTail(server.unblocked_clients,server.master);
         }