From a13be203b7877ba56ef63aac4a2e65d4e1a4adbc Mon Sep 17 00:00:00 2001
From: Da Zhou <da.zhou@microsoft.com>
Date: Tue, 13 Nov 2018 21:46:18 +0000
Subject: [PATCH] HADOOP-15876. Use keySet().removeAll() to remove multiple
 keys from Map in AzureBlobFileSystemStore

Contributed by Da Zhou.
---
 .../apache/hadoop/fs/azurebfs/AzureBlobFileSystemStore.java   | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/AzureBlobFileSystemStore.java b/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/AzureBlobFileSystemStore.java
index bfdbba83763..f300a9ab177 100644
--- a/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/AzureBlobFileSystemStore.java
+++ b/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/AzureBlobFileSystemStore.java
@@ -678,9 +678,7 @@ public class AzureBlobFileSystemStore {
       }
     }
 
-    for (Map.Entry<String, String> defaultAclEntry : defaultAclEntries.entrySet()) {
-      aclEntries.remove(defaultAclEntry.getKey());
-    }
+    aclEntries.keySet().removeAll(defaultAclEntries.keySet());
 
     client.setAcl(AbfsHttpConstants.FORWARD_SLASH + getRelativePath(path, true),
         AbfsAclHelper.serializeAclSpec(aclEntries), eTag);