From d2673d86591cd9daa45ee1acecaaa218d0fe18c3 Mon Sep 17 00:00:00 2001
From: Fabian Reinartz <fab.reinartz@gmail.com>
Date: Thu, 18 May 2017 16:12:17 +0200
Subject: [PATCH] Completely drop empty blocks

---
 compact.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/compact.go b/compact.go
index e52a080ef..483d7da54 100644
--- a/compact.go
+++ b/compact.go
@@ -200,6 +200,11 @@ func (c *compactor) Compact(dirs ...string) (err error) {
 }
 
 func (c *compactor) Write(b Block) error {
+	// Buffering blocks might have been created that often have no data.
+	if b.Meta().Stats.NumSeries == 0 {
+		return errors.Wrap(os.RemoveAll(b.Dir()), "remove empty block")
+	}
+
 	entropy := rand.New(rand.NewSource(time.Now().UnixNano()))
 	uid := ulid.MustNew(ulid.Now(), entropy)