HDFS-7637. Fix the check condition for reserved path. Contributed by Yi Liu.

(cherry picked from commit e843a0a8cee5c704a5d28cf14b5a4050094d341b)

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -456,6 +456,8 @@ Release 2.7.0 - UNRELEASED
     using more than 1 DataNode and more than 2 storage locations per DataNode.
     (cnauroth)
 
+    HDFS-7637. Fix the check condition for reserved path. (Yi Liu via jing9)
+
 Release 2.6.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java

@@ -1237,7 +1237,7 @@ public class FSDirectory implements Closeable {
 
   /** Check if a given path is reserved */
   public static boolean isReservedName(String src) {
-    return src.startsWith(DOT_RESERVED_PATH_PREFIX);
+    return src.startsWith(DOT_RESERVED_PATH_PREFIX + Path.SEPARATOR);
   }
 
   static boolean isReservedRawName(String src) {