From 5129bb37dd49d38f0d174e327c92345b4565caf6 Mon Sep 17 00:00:00 2001
From: Jianjun Liao <36503113+Leavrth@users.noreply.github.com>
Date: Wed, 13 Nov 2024 11:12:38 +0800
Subject: [PATCH] br: reduce memory usage when get incomplete ranges (#57192)

close pingcap/tidb#53529
---
 br/pkg/rtree/rtree.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/br/pkg/rtree/rtree.go b/br/pkg/rtree/rtree.go
index d487fb70de9ba..aefa1343d4150 100644
--- a/br/pkg/rtree/rtree.go
+++ b/br/pkg/rtree/rtree.go
@@ -418,7 +418,8 @@ func (rangeTree *ProgressRangeTree) Iter() *IncompleteRangesFetcher {
 }
 
 func (iter *IncompleteRangesFetcher) GetIncompleteRanges() []Range {
-	incompleteRanges := make([]Range, 0, 64*len(iter.items))
+	// about 64 MB memory if there are 1 million ranges
+	incompleteRanges := make([]Range, 0, len(iter.items))
 	for _, item := range iter.items {
 		if item.complete {
 			continue