Trigger a save of the cluster configuration file before shutting down

The cluster configuration file is the metadata "database" for the
cluster. It is best to trigger a save when shutdown the server, to
avoid inconsistent content that is not refreshed.

Signed-off-by: Binbin <[email protected]>

src/cluster.h

@@ -38,6 +38,7 @@ void clusterInit(void);
 void clusterInitLast(void);
 void clusterCron(void);
 void clusterBeforeSleep(void);
+int clusterSaveConfig(int do_fsync);
 int verifyClusterConfigWithData(void);
 
 int clusterSendModuleMessageToTarget(const char *target,

src/server.c

@@ -4336,14 +4336,19 @@ int finishShutdown(void) {
     /* Close the listening sockets. Apparently this allows faster restarts. */
     closeListeningSockets(1);
 
+    if (server.cluster_enabled) {
+        /* The error logs have been logged in the save function if the save fails. */
+        serverLog(LL_NOTICE, "Saving the cluster configuration file before exiting.");
+        clusterSaveConfig(1);
+    }
+
 #if !defined(__sun)
     /* Unlock the cluster config file before shutdown */
     if (server.cluster_enabled && server.cluster_config_file_lock_fd != -1) {
         flock(server.cluster_config_file_lock_fd, LOCK_UN | LOCK_NB);
     }
 #endif /* __sun */
 
-
     serverLog(LL_WARNING, "%s is now ready to exit, bye bye...", server.sentinel_mode ? "Sentinel" : "Valkey");
     return C_OK;