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https://issues.apache.org/jira/browse/HDFS-16296?focusedWorklogId=676250&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-676250
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ASF GitHub Bot logged work on HDFS-16296:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 04/Nov/21 08:10
            Start Date: 04/Nov/21 08:10
    Worklog Time Spent: 10m 
      Work Description: tomscut commented on a change in pull request #3613:
URL: https://github.com/apache/hadoop/pull/3613#discussion_r742610791



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcClient.java
##########
@@ -134,6 +136,7 @@
 
   /** Fairness manager to control handlers assigned per NS. */
   private RouterRpcFairnessPolicyController routerRpcFairnessPolicyController;
+  private Map<String, AtomicLong> rejectedPermitsPerNs = new 
ConcurrentHashMap<>();

Review comment:
       For better performance, can we replace AtomicLong with LongAdder. Just a 
suggestion.




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 676250)
    Time Spent: 3h 40m  (was: 3.5h)

> RBF: RouterRpcFairnessPolicyController add denied permits for each nameservice
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-16296
>                 URL: https://issues.apache.org/jira/browse/HDFS-16296
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Janus Chow
>            Assignee: Janus Chow
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 3h 40m
>  Remaining Estimate: 0h
>
> Currently RouterRpcFairnessPolicyController has a metric of 
> "getProxyOpPermitRejected" to show the total rejected invokes due to lack of 
> permits.
> This ticket is to add the metrics for each nameservice to have a better view 
> of the load of each nameservice.



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