MAPREDUCE-7521. Fix TestUberAM failures after JUnit 5 migration. (#8017) Contributed by Shilun Fan

* MAPREDUCE-7521. Fix TestUberAM failures after JUnit 5 migration. 

Reviewed-by: Tsz-Wo Nicholas Sze <[email protected]>
Signed-off-by: Shilun Fan <[email protected]>

Author: slfan1989

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/v2/TestMRJobs.java

@@ -153,7 +153,7 @@ public class TestMRJobs {
   @BeforeAll
   public static void setup() throws IOException {
     try {
-      dfsCluster = new MiniDFSCluster.Builder(conf).numDataNodes(2)
+      dfsCluster = new MiniDFSCluster.Builder(conf).numDataNodes(5)
         .format(true).racks(null).build();
       remoteFs = dfsCluster.getFileSystem();
     } catch (IOException io) {

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/v2/TestUberAM.java

@@ -45,7 +45,6 @@ public class TestUberAM extends TestMRJobs {
 
   @BeforeAll
   public static void setup() throws IOException {
-    TestMRJobs.setup();
     if (mrCluster != null) {
     	mrCluster.getConfig().setBoolean(MRJobConfig.JOB_UBERTASK_ENABLE, true);
     	mrCluster.getConfig().setInt(MRJobConfig.JOB_UBERTASK_MAXREDUCES, 3);