From 32d150214f565f9ab71be0bc5a2e76b306040127 Mon Sep 17 00:00:00 2001
From: Michael Desa <mjdesa@gmail.com>
Date: Thu, 2 Mar 2017 15:42:58 -0500
Subject: [PATCH] Change RLock to a Lock in shouldKeep in sample node

---
 sample.go | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/sample.go b/sample.go
index 9527b62d4..010a2e728 100644
--- a/sample.go
+++ b/sample.go
@@ -85,12 +85,10 @@ func (s *SampleNode) shouldKeep(group models.GroupID, t time.Time) bool {
 		keepTime := t.Truncate(s.duration)
 		return t.Equal(keepTime)
 	} else {
-		s.countsMu.RLock()
+		s.countsMu.Lock()
 		count := s.counts[group]
-		s.countsMu.RUnlock()
 		keep := count%s.s.N == 0
 		count++
-		s.countsMu.Lock()
 		s.counts[group] = count
 		s.countsMu.Unlock()
 		return keep