From 984d39451330ebd40fcb967e949186f4530511e9 Mon Sep 17 00:00:00 2001
From: guyinyou <guyinyou.gyy@alibaba-inc.com>
Date: Wed, 21 Jan 2026 15:46:32 +0800
Subject: [PATCH] Fix: avoid extra padding when message end position is already
 page-aligned

Change-Id: I3e7fad9c4b194b20015414bcceb830760df68fea
---
 .../org/apache/rocketmq/store/logfile/DefaultMappedFile.java   | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/store/src/main/java/org/apache/rocketmq/store/logfile/DefaultMappedFile.java b/store/src/main/java/org/apache/rocketmq/store/logfile/DefaultMappedFile.java
index 7c4e5e025a7..7a7b5f84368 100644
--- a/store/src/main/java/org/apache/rocketmq/store/logfile/DefaultMappedFile.java
+++ b/store/src/main/java/org/apache/rocketmq/store/logfile/DefaultMappedFile.java
@@ -389,6 +389,9 @@ public AppendMessageResult appendMessagesInner(final MessageExt messageExt, fina
                         int endpos = currentPos + msgLen;
                         // alignment end position
                         int extraAppendSize = UNSAFE_PAGE_SIZE - endpos % UNSAFE_PAGE_SIZE;
+                        if (extraAppendSize == UNSAFE_PAGE_SIZE) {
+                            extraAppendSize = 0;
+                        }
                         int actualAppendSize = msgLen + extraAppendSize;
 
                         this.fileChannel.position(currentPos);