From ddae78b0ec7e231b0931133c55fe560ea8aee965 Mon Sep 17 00:00:00 2001
From: hfutatzhanghb <hfutzhanghb@163.com>
Date: Thu, 8 Jun 2023 16:58:01 +0800
Subject: [PATCH] HDFS-17035. FsVolumeImpl#getActualNonDfsUsed may return
 negative value. (#5708). Contributed by farmmamba.

Reviewed-by: Shuyan Zhang <zqingchai@gmail.com>
Reviewed-by: He Xiaoqiao <hexiaoqiao@apache.org>
Signed-off-by: Ayush Saxena <ayushsaxena@apache.org>
---
 .../hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java       | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
index 9ee7337755..bf68f96a6d 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
@@ -499,7 +499,7 @@ long getActualNonDfsUsed() throws IOException {
         return used;
       }
     }
-    return getDfUsed() - getDfsUsed();
+    return Math.max(getDfUsed() - getDfsUsed(), 0L);
   }
 
   /**