zhaoyim commented on a change in pull request #2037:
URL: https://github.com/apache/hadoop/pull/2037#discussion_r450583750



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java
##########
@@ -201,8 +201,19 @@ public void run(Path path) throws IOException {
       super(conf);
       CommandFormat c = new CommandFormat(2, Integer.MAX_VALUE);
       List<String> parameters = c.parse(args, pos);
-      this.quota =
-          
StringUtils.TraditionalBinaryPrefix.string2long(parameters.remove(0));
+      String str = parameters.get(0).trim();
+      try {
+        this.quota = StringUtils.TraditionalBinaryPrefix
+                .string2long(parameters.remove(0));
+      } catch(NumberFormatException e){
+        throw new IllegalArgumentException("\"" + str +
+                "\" is not a valid value for a quota.");
+      }
+      if (HdfsConstants.QUOTA_DONT_SET == this.quota) {
+        System.out.print("WARN: \"" + this.quota +

Review comment:
       Agree with U, change to throw exception. Thanks for comfirm!




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