HDFS-9069. TestNameNodeMetricsLogger failing -port in use. (stevel)

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

@@ -975,6 +975,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-9041. Move entries in META-INF/services/o.a.h.fs.FileSystem to
     hdfs-client. (Mingliang Liu via wheat9)
 
+    HDFS-9069. TestNameNodeMetricsLogger failing -port in use.
+    (stevel)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

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

@@ -25,6 +25,7 @@ import org.apache.commons.logging.impl.Log4JLogger;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.metrics2.util.MBeans;
+import org.apache.hadoop.net.ServerSocketUtil;
 import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.log4j.Appender;
 import org.apache.log4j.AppenderSkeleton;
@@ -118,8 +119,8 @@ public class TestNameNodeMetricsLogger {
     return new TestNameNode(conf);
   }
 
-  private int getRandomPort() {
-    return 10000 + random.nextInt(50000);
+  private int getRandomPort() throws IOException {
+    return ServerSocketUtil.getPort(0, 10);
   }
 
   private void addAppender(Log log, Appender appender) {