haiyang1987 commented on code in PR #7120:
URL: https://github.com/apache/hadoop/pull/7120#discussion_r1817722910


##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java:
##########
@@ -1071,6 +1096,12 @@ static BalancerParameters parse(String[] args) {
               b.setSortTopNodes(true);
               LOG.info("Balancer will sort nodes by" +
                   " capacity usage percentage to prioritize top used nodes");
+            } else if ("-limitOverUtilizedNum".equalsIgnoreCase(args[i])) {
+              Preconditions.checkArgument(++i < args.length,
+                  "limitOverUtilizedNum value is missing: args = " + 
Arrays.toString(args));
+              int limitNum = Integer.parseInt(args[i]);

Review Comment:
   Here we need to check if `limitNum` is less than 1?



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