diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 3025d0badb..c34a6f6f6b 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -7961,6 +7961,17 @@ StartupXLOG(void)
 	 */
 	WalSndWakeup();
 
+	/* DEBUG: cause a reload */
+	{
+		struct stat b;
+		if (stat("/tmp/hoge", &b) == 0)
+		{
+			elog(LOG, "STARTUP SLEEP FOR 1s");
+			sleep(1);
+			elog(LOG, "DONE.");
+			DirectFunctionCall1(pg_reload_conf, 0);
+		}
+	}
 	/*
 	 * If this was a fast promotion, request an (online) checkpoint now. This
 	 * isn't required for consistency, but the last restartpoint might be far
diff --git a/src/backend/postmaster/checkpointer.c b/src/backend/postmaster/checkpointer.c
index 1a033093c5..26da229ca1 100644
--- a/src/backend/postmaster/checkpointer.c
+++ b/src/backend/postmaster/checkpointer.c
@@ -354,6 +354,9 @@ CheckpointerMain(void)
 		 */
 		AbsorbFsyncRequests();
 
+		elog(LOG, "CHECKPOINTER SLEEP FOR 3s");
+		sleep(3);
+		elog(LOG, "DONE.");
 		if (got_SIGHUP)
 		{
 			got_SIGHUP = false;