diff --git a/src/gausskernel/process/postmaster/postmaster.cpp b/src/gausskernel/process/postmaster/postmaster.cpp
index 1442a284ee65ecda3cda607c187abfaf1b84c167..eb5a6aa2e55e4b8e4195ea90133b0854707c88ba 100644
--- a/src/gausskernel/process/postmaster/postmaster.cpp
+++ b/src/gausskernel/process/postmaster/postmaster.cpp
@@ -5278,6 +5278,9 @@ static void SIGHUP_handler(SIGNAL_ARGS)
         LWLockRelease(ConfigFileLock);
         NotifyGscSigHup();
 
+        most_available_sync = (volatile bool) u_sess->attr.attr_storage.guc_most_available_sync;
+        SyncRepUpdateSyncStandbysDefined();
+
         (void)SignalChildren(SIGHUP);
         if (ENABLE_THREAD_POOL) {
             g_threadPoolControler->GetSessionCtrl()->SigHupHandler();