tomscut commented on a change in pull request #3613:
URL: https://github.com/apache/hadoop/pull/3613#discussion_r742610791
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File path:
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcClient.java
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@@ -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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