HDFS-9302. WebHDFS throws NullPointerException if newLength is not provided. (Jagadesh Kiran N via yliu)

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

@@ -1338,6 +1338,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-9231. fsck doesn't list correct file path when Bad Replicas/Blocks
     are in a snapshot. (Xiao Chen via Yongjun Zhang)
 
+    HDFS-9302. WebHDFS throws NullPointerException if newLength is not
+    provided. (Jagadesh Kiran N via yliu)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java

@@ -707,6 +707,10 @@ public class NamenodeWebHdfsMethods {
     }
     case TRUNCATE:
     {
+      if (newLength.getValue() == null) {
+        throw new IllegalArgumentException(
+            "newLength parameter is Missing");
+      }
       // We treat each rest request as a separate client.
       final boolean b = np.truncate(fullpath, newLength.getValue(), 
           "DFSClient_" + DFSUtil.getSecureRandom().nextLong());