HDFS-7813. TestDFSHAAdminMiniCluster#testFencer testcase is failing frequently. Contributed by Rakesh R.

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

@@ -1001,6 +1001,9 @@ Release 2.7.0 - UNRELEASED
     HDFS-7814. Fix usage string of storageType parameter for
     "dfsadmin -setSpaceQuota/clrSpaceQuota". (Xiaoyu Yao via cnauroth)
 
+    HDFS-7813. TestDFSHAAdminMiniCluster#testFencer testcase is failing
+    frequently. (Rakesh R via cnauroth)
+
     BREAKDOWN OF HDFS-7584 SUBTASKS AND RELATED JIRAS
 
       HDFS-7720. Quota by Storage Type API, tools and ClientNameNode

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/TestDFSHAAdminMiniCluster.java

@@ -155,6 +155,7 @@ public class TestDFSHAAdminMiniCluster {
     tool.setConf(conf);
     assertEquals(0, runTool("-transitionToActive", "nn1"));
     assertEquals(0, runTool("-failover", "nn1", "nn2"));
+    assertEquals(0, runTool("-failover", "nn2", "nn1"));
     
     // Fencer has not run yet, since none of the above required fencing 
     assertEquals("", Files.toString(tmpFile, Charsets.UTF_8));