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add doc
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  • hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/async

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hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/async/RouterAsyncRpcClient.java

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@@ -503,6 +503,7 @@ public <T extends RemoteLocationContext, R> List<RemoteResult<T, R>> invokeConcu
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// Shortcut, just one call
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return invokeSingle(locations.iterator().next(), method);
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}
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// Don't acquire CONCURRENT_NS permit here.
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RouterRpcFairnessPolicyController controller = getRouterRpcFairnessPolicyController();
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List<T> orderedLocations = new ArrayList<>();

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