HDFS-7897. Shutdown metrics when stopping JournalNode. Contributed by zhouyingchao.

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

@@ -2345,6 +2345,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-6885. Fix wrong use of BytesWritable in FSEditLogOp#RenameOp.
     (Yi Liu via wheat9)
 
+    HDFS-7897. Shutdown metrics when stopping JournalNode.
+    (zhouyingchao via wheat9)
+
 Release 2.7.3 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/server/JournalNode.java

@@ -207,6 +207,8 @@ public class JournalNode implements Tool, Configurable, JournalNodeMXBean {
       IOUtils.cleanup(LOG, j);
     }
 
+    DefaultMetricsSystem.shutdown();
+
     if (journalNodeInfoBeanName != null) {
       MBeans.unregister(journalNodeInfoBeanName);
       journalNodeInfoBeanName = null;