HDFS-7448 TestBookKeeperHACheckpoints fails in trunk build

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

@@ -257,6 +257,9 @@ Trunk (Unreleased)
 
     HDFS-7407. Minor typo in privileged pid/out/log names (aw)
 
+    HDFS-7448 TestBookKeeperHACheckpoints fails in trunk build
+    (Akira Ajisaka via stevel)
+
 Release 2.7.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/contrib/bkjournal/src/test/java/org/apache/hadoop/contrib/bkjournal/TestBookKeeperHACheckpoints.java

@@ -52,7 +52,7 @@ public class TestBookKeeperHACheckpoints extends TestStandbyCheckpoints {
 
     cluster = new MiniDFSCluster.Builder(conf)
       .nnTopology(topology)
-      .numDataNodes(0)
+      .numDataNodes(1)
       .manageNameDfsSharedDirs(false)
       .build();
     cluster.waitActive();