stoty commented on code in PR #1431:
URL: https://github.com/apache/phoenix/pull/1431#discussion_r868191956


##########
phoenix-core/src/test/java/org/apache/phoenix/monitoring/MetricUtilTest.java:
##########
@@ -48,4 +52,17 @@ public void testGetMetricsStopWatchWithMetricsFalse() throws 
Exception {
                 LogLevel.OFF, WALL_CLOCK_TIME_MS);
         assertFalse(metricsStopWatch.getMetricsEnabled());
     }
+
+    @Test
+    //Check that MetricsSystemImpl has a String "prefix" field in the Hadoop 
version we test with
+    public void testInternalMetricsField() throws NoSuchFieldException,
+            SecurityException, IllegalArgumentException, 
IllegalAccessException {
+        MetricsSystemImpl metrics = (MetricsSystemImpl) 
DefaultMetricsSystem.instance();
+        Field prefixField = MetricsSystemImpl.class.getDeclaredField("prefix");
+        prefixField.setAccessible(true);
+        String oldValue = (String)prefixField.get(metrics);
+        prefixField.set(metrics, "dummy");
+        prefixField.set(metrics, oldValue);
+        prefixField.setAccessible(false);

Review Comment:
   isDefaultMetricsInitialized() already has a catch-all section to avoid 
failing if the API changes, so it cannot really be tested.



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