lfxy commented on code in PR #6319:
URL: https://github.com/apache/hadoop/pull/6319#discussion_r1414958968


##########
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/NNThroughputBenchmark.java:
##########
@@ -1346,9 +1376,9 @@ void printResults() {
   class ReplicationStats extends OperationStatsBase {
     static final String OP_REPLICATION_NAME = "replication";
     static final String OP_REPLICATION_USAGE = 
-        "-op replication [-datanodes T] [-nodesToDecommission D] " +
+        "-op replication [-datanodes T] [-nodesToDecommission N] " +

Review Comment:
   P and B has also been used, such as -blocksPerReport B and -filesPerDir P. 
And other alphabets cannot be related to directory I think. Could I keep using 
D?



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