ZanderXu commented on code in PR #4606:
URL: https://github.com/apache/hadoop/pull/4606#discussion_r927153919


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hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RBFConfigKeys.java:
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@@ -315,6 +315,9 @@ public class RBFConfigKeys extends 
CommonConfigurationKeysPublic {
       FEDERATION_ROUTER_PREFIX + "dn-report.cache-expire";
   public static final long DN_REPORT_CACHE_EXPIRE_MS_DEFAULT =
       TimeUnit.SECONDS.toMillis(10);
+  public static final String DFS_ROUTER_ENABLE_GET_DN_USAGE_KEY =
+      FEDERATION_ROUTER_PREFIX + "enable.get.dn.usage";
+  public static final boolean DFS_ROUTER_ENABLE_GET_DN_USAGE_DEFAULT = true;

Review Comment:
   Copy, I will do it.



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