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https://issues.apache.org/jira/browse/HDFS-16959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17702975#comment-17702975
 ] 

ASF GitHub Bot commented on HDFS-16959:
---------------------------------------

virajjasani commented on code in PR #5497:
URL: https://github.com/apache/hadoop/pull/5497#discussion_r1142815720


##########
hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/store/driver/TestStateStoreDriverBase.java:
##########
@@ -574,6 +578,15 @@ private static Map<String, Class<?>> getFields(BaseRecord 
record) {
     return getters;
   }
 
+  public void testCacheLoadMetrics(StateStoreDriver driver, int numRefresh)
+      throws IOException, IllegalArgumentException {
+    StateStoreMetrics metrics = stateStore.getMetrics();
+    final Query<MountTable> query = new Query<>(MountTable.newInstance());
+    driver.getMultiple(MountTable.class, query);
+    assertEquals(numRefresh,

Review Comment:
   Done, added time as well. I have added time duration value high enough that 
it's highly unlikely that it could fail to assert the value.





> RBF: state store cache loading metrics
> --------------------------------------
>
>                 Key: HDFS-16959
>                 URL: https://issues.apache.org/jira/browse/HDFS-16959
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Viraj Jasani
>            Assignee: Viraj Jasani
>            Priority: Major
>              Labels: pull-request-available
>
> With increasing num of state store records (like mount points), it would be 
> good to be able to get the cache loading metrics like avg time for cache load 
> during refresh, num of times cache is loaded etc.



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