From 7348d2ae6398387bb96526f1d3d9f6fcafc3d4da Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Fri, 5 Nov 2021 00:03:13 -0700
Subject: [PATCH] randomize traffic if replicated

---
 weed/filer/filechunk_manifest.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/weed/filer/filechunk_manifest.go b/weed/filer/filechunk_manifest.go
index 32008271b..023d9e04a 100644
--- a/weed/filer/filechunk_manifest.go
+++ b/weed/filer/filechunk_manifest.go
@@ -6,6 +6,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/wdclient"
 	"io"
 	"math"
+	"math/rand"
 	"net/url"
 	"strings"
 	"time"
@@ -142,6 +143,9 @@ func retriedStreamFetchChunkData(writer io.Writer, urlStrings []string, cipherKe
 	var shouldRetry bool
 	var totalWritten int
 
+	rand.Shuffle(len(urlStrings), func(i, j int) {
+		urlStrings[i], urlStrings[j] = urlStrings[j], urlStrings[i]
+	})
 	for waitTime := time.Second; waitTime < util.RetryWaitTime; waitTime += waitTime / 2 {
 		for _, urlString := range urlStrings {
 			var localProcesed int