From a25a2143cecb0fe6554daa4648fbeafc43a79873 Mon Sep 17 00:00:00 2001
From: wayen <2229306838@qq.com>
Date: Wed, 3 Jan 2024 14:37:01 +0800
Subject: [PATCH] ethdb/pebble: cap memory table size as maxMemTableSize-1
 (#28444) (#2120)

---
 ethdb/pebble/pebble.go | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/ethdb/pebble/pebble.go b/ethdb/pebble/pebble.go
index 561524c0a4c0..429e92004ee6 100644
--- a/ethdb/pebble/pebble.go
+++ b/ethdb/pebble/pebble.go
@@ -156,8 +156,15 @@ func New(file string, cache int, handles int, namespace string, readonly bool) (
 	// including a frozen memory table and another live one.
 	memTableLimit := 2
 	memTableSize := cache * 1024 * 1024 / 2 / memTableLimit
-	if memTableSize > maxMemTableSize {
-		memTableSize = maxMemTableSize
+
+	// The memory table size is currently capped at maxMemTableSize-1 due to a
+	// known bug in the pebble where maxMemTableSize is not recognized as a
+	// valid size.
+	//
+	// TODO use the maxMemTableSize as the maximum table size once the issue
+	// in pebble is fixed.
+	if memTableSize >= maxMemTableSize {
+		memTableSize = maxMemTableSize - 1
 	}
 
 	logger.Info("Allocated cache and file handles", "cache", common.StorageSize(cache*1024*1024),