pkuwm commented on a change in pull request #557: Add instance capacity gauge
URL: https://github.com/apache/helix/pull/557#discussion_r366528083
 
 

 ##########
 File path: 
helix-core/src/main/java/org/apache/helix/monitoring/mbeans/dynamicMBeans/DynamicMBeanProvider.java
 ##########
 @@ -159,28 +163,30 @@ public synchronized void unregister() {
 
   @Override
   public Object getAttribute(String attribute)
-      throws AttributeNotFoundException, MBeanException, ReflectionException {
+      throws AttributeNotFoundException {
     if (SENSOR_NAME_TAG.equals(attribute)) {
       return getSensorName();
     }
 
-    if (!_attributeMap.containsKey(attribute)) {
-      return null;
+    DynamicMetric metric = _attributeMap.get(attribute);
+    if (metric == null) {
+      throw new AttributeNotFoundException("Attribute[" + attribute + "] is 
not found.");
 
 Review comment:
   Test results:
   1. MBeanInfo async with the list.
   Running 2 threads: thread 1 awaits while it is updating attributes "A" and 
"B" (not completed); meanwhile, thread 2 updates attributes "C", "D" and 
completes. Finally, "C", "D" could be fetched correctly, while getting "A" and 
"B" throws AttributeNotFoundException. thread 1 completes updating. Fetching 
"A", "B" correctly, and throwing AttributeNotFoundException for fetching "C", 
"D"
   2. Fix async.
   Has run a few tests. It works fine and confirms to fetch the data correctly.

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