From 6eee86dce80e26160543aa75985036f581ff4226 Mon Sep 17 00:00:00 2001
From: Fabian Reinartz <fab.reinartz@gmail.com>
Date: Tue, 12 Jan 2016 10:52:40 +0100
Subject: [PATCH] Terminate rule groups during initial sleep

When an evaluation group runs initially, it waits a deterministic
amount of time. During that time it also has to accept
a termination singnal so shutdown doesn't hang during the first
evaluation iteration after a configuration reload.

Fixes #1307
---
 rules/manager.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/rules/manager.go b/rules/manager.go
index 84eb0697e5..212c9f9e5c 100644
--- a/rules/manager.go
+++ b/rules/manager.go
@@ -123,7 +123,11 @@ func (g *Group) run() {
 	defer close(g.terminated)
 
 	// Wait an initial amount to have consistently slotted intervals.
-	time.Sleep(g.offset())
+	select {
+	case <-time.After(g.offset()):
+	case <-g.done:
+		return
+	}
 
 	iter := func() {
 		start := time.Now()