HDFS-9387. Fix namenodeUri parameter parsing in NNThroughputBenchmark. Contributed by Mingliang Liu.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -2305,6 +2305,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-9413. getContentSummary() on standby should throw StandbyException.
     (Brahma Reddy Battula via mingma)
 
+    HDFS-9387. Fix namenodeUri parameter parsing in NNThroughputBenchmark.
+    (Mingliang Liu via xyao)
+
 Release 2.7.3 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/NNThroughputBenchmark.java

@@ -382,10 +382,12 @@ public class NNThroughputBenchmark implements Tool {
         args.remove(ugrcIndex);
       }
 
-      try {
-        namenodeUri = StringUtils.popOptionWithArgument("-namenode", args);
-      } catch (IllegalArgumentException iae) {
-        printUsage();
+      if (args.indexOf("-namenode") >= 0) {
+        try {
+          namenodeUri = StringUtils.popOptionWithArgument("-namenode", args);
+        } catch (IllegalArgumentException iae) {
+          printUsage();
+        }
       }
 
       String type = args.get(1);