Revert "HDFS-10668. Fix intermittently failing UT TestDataNodeMXBean#…

…testDataNodeMXBeanBlockCount. Contributed by Mingliang Liu."

This reverts commit 7cac765.

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeMXBean.java

@@ -25,13 +25,11 @@
 import javax.management.MBeanServer;
 import javax.management.ObjectName;
 
-import com.google.common.base.Supplier;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.DFSTestUtil;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
-import org.apache.hadoop.test.GenericTestUtils;
 import org.junit.Assert;
 import org.junit.Test;
 import org.mortbay.util.ajax.JSON;
@@ -121,18 +119,10 @@ public void testDataNodeMXBeanBlockCount() throws Exception {
       cluster.waitActive();
       assertEquals("After restart DN", 5, getTotalNumBlocks(mbs, mxbeanName));
       fs.delete(new Path("/tmp.txt1"), true);
-      // The total numBlocks should be updated after one file is deleted
-      GenericTestUtils.waitFor(new Supplier<Boolean>() {
-        @Override
-        public Boolean get() {
-          try {
-            return getTotalNumBlocks(mbs, mxbeanName) == 4;
-          } catch (Exception e) {
-            e.printStackTrace();
-            return false;
-          }
-        }
-      }, 100, 30000);
+      // Wait till replica gets deleted on disk.
+      Thread.sleep(5000);
+      assertEquals("After delete one file", 4,
+              getTotalNumBlocks(mbs, mxbeanName));
     } finally {
       if (cluster != null) {
         cluster.shutdown();
@@ -141,7 +131,7 @@ public Boolean get() {
   }
 
   @SuppressWarnings("unchecked")
-  private int getTotalNumBlocks(MBeanServer mbs, ObjectName mxbeanName)
+  int getTotalNumBlocks(MBeanServer mbs, ObjectName mxbeanName)
           throws Exception {
     int totalBlocks = 0;
     String volumeInfo = (String) mbs.getAttribute(mxbeanName, "VolumeInfo");