haiyang1987 commented on code in PR #5823:
URL: https://github.com/apache/hadoop/pull/5823#discussion_r1263602582


##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java:
##########
@@ -951,6 +960,45 @@ private String reconfDfsUsageParameters(String property, 
String newVal)
     }
   }
 
+  private String reconfDiskBalancerParameters(String property, String newVal)
+      throws ReconfigurationException {
+    String result = null;
+    try {
+      LOG.info("Reconfiguring {} to {}", property, newVal);
+      if (property.equals(DFS_DISK_BALANCER_ENABLED)) {
+        if (newVal != null && !newVal.equalsIgnoreCase("true")
+            && !newVal.equalsIgnoreCase("false")) {
+          throw new IllegalArgumentException("Not a valid Boolean value for " 
+ property +
+              " in reconfDiskBalancerParameters");
+        }
+        boolean enable = (newVal == null ? DFS_DISK_BALANCER_ENABLED_DEFAULT :
+            Boolean.parseBoolean(newVal));

Review Comment:
   Hi Sir, the addition of this check is intended to consider the case where 
newVal is null.



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