From bafe92d9406d28edf3443fad6104c117ac5eb312 Mon Sep 17 00:00:00 2001
From: Huginn <63332600+Huginn-kio@users.noreply.github.com>
Date: Wed, 16 Sep 2026 20:42:14 +0800
Subject: [PATCH] HBASE-30391 Reduce array copying on expanding
 ByteArrayOutputStream

---
 .../java/org/apache/hadoop/hbase/io/ByteArrayOutputStream.java  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hbase-common/src/main/java/org/apache/hadoop/hbase/io/ByteArrayOutputStream.java b/hbase-common/src/main/java/org/apache/hadoop/hbase/io/ByteArrayOutputStream.java
index d6b4c34aebbe..6208048b5d7d 100644
--- a/hbase-common/src/main/java/org/apache/hadoop/hbase/io/ByteArrayOutputStream.java
+++ b/hbase-common/src/main/java/org/apache/hadoop/hbase/io/ByteArrayOutputStream.java
@@ -91,7 +91,7 @@ private void checkSizeAndGrow(int extra) {
         throw new BufferOverflowException();
       }
       byte[] newBuf = new byte[(int) nextCapacity];
-      System.arraycopy(buf, 0, newBuf, 0, buf.length);
+      System.arraycopy(buf, 0, newBuf, 0, pos);
       buf = newBuf;
     }
   }