HDFS-10619. Cache path in InodesInPath. Contributed by Daryn Sharp.

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

@@ -278,6 +278,8 @@ public class INodesInPath {
   }
 
   private final byte[][] path;
+  private final String pathname;
+
   /**
    * Array with the specified number of INodes resolved for a given path.
    */
@@ -306,6 +308,7 @@ public class INodesInPath {
     Preconditions.checkArgument(inodes != null && path != null);
     this.inodes = inodes;
     this.path = path;
+    this.pathname = DFSUtil.byteArray2PathString(path);
     this.isRaw = isRaw;
     this.isSnapshot = isSnapshot;
     this.snapshotId = snapshotId;
@@ -366,7 +369,7 @@ public class INodesInPath {
 
   /** @return the full path in string form */
   public String getPath() {
-    return DFSUtil.byteArray2PathString(path);
+    return pathname;
   }
 
   public String getParentPath() {