From 3dbd51c3c2b2badc5360f803e62da818d3e6c23f Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Fri, 26 Jun 2020 10:02:37 -0700
Subject: [PATCH] a little bit more efficient

---
 weed/util/chunk_cache/chunk_cache.go | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/weed/util/chunk_cache/chunk_cache.go b/weed/util/chunk_cache/chunk_cache.go
index ca26e1f77..325253837 100644
--- a/weed/util/chunk_cache/chunk_cache.go
+++ b/weed/util/chunk_cache/chunk_cache.go
@@ -58,9 +58,21 @@ func (c *ChunkCache) doGetChunk(fileId string, chunkSize uint64) (data []byte) {
 		return nil
 	}
 
-	for _, diskCache := range c.diskCaches {
-		data := diskCache.getChunk(fid.Key)
-		if len(data) != 0 && len(data) >= int(chunkSize) {
+	if chunkSize < onDiskCacheSizeLimit0 {
+		data = c.diskCaches[0].getChunk(fid.Key)
+		if len(data) >= int(chunkSize) {
+			return data
+		}
+	}
+	if chunkSize < onDiskCacheSizeLimit1 {
+		data = c.diskCaches[1].getChunk(fid.Key)
+		if len(data) >= int(chunkSize) {
+			return data
+		}
+	}
+	{
+		data = c.diskCaches[2].getChunk(fid.Key)
+		if len(data) >= int(chunkSize) {
 			return data
 		}
 	}