From 6bc09b18c4a6ec75e3febe48393d3b0525bac486 Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Wed, 14 Apr 2021 20:26:56 -0700
Subject: [PATCH] truncate is a bit faster to reuse the storage

---
 weed/util/chunk_cache/chunk_cache_on_disk.go | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/weed/util/chunk_cache/chunk_cache_on_disk.go b/weed/util/chunk_cache/chunk_cache_on_disk.go
index d724e925e..6f87a9a06 100644
--- a/weed/util/chunk_cache/chunk_cache_on_disk.go
+++ b/weed/util/chunk_cache/chunk_cache_on_disk.go
@@ -88,15 +88,17 @@ func (v *ChunkCacheVolume) Shutdown() {
 	}
 }
 
-func (v *ChunkCacheVolume) destroy() {
+func (v *ChunkCacheVolume) doReset() {
 	v.Shutdown()
-	os.Remove(v.fileName + ".dat")
-	os.Remove(v.fileName + ".idx")
+	os.Truncate(v.fileName + ".dat", 0)
+	os.Truncate(v.fileName + ".idx", 0)
+	glog.V(4).Infof("cache removeAll %s ...", v.fileName + ".ldb")
 	os.RemoveAll(v.fileName + ".ldb")
+	glog.V(4).Infof("cache removed %s", v.fileName + ".ldb")
 }
 
 func (v *ChunkCacheVolume) Reset() (*ChunkCacheVolume, error) {
-	v.destroy()
+	v.doReset()
 	return LoadOrCreateChunkCacheVolume(v.fileName, v.sizeLimit)
 }