HDFS-10199. Unit tests TestCopyFiles, TestDistCh, TestLogalyzer under org.apache.hadoop.tools are failing. Contributed by Tibor Kiss.

(cherry picked from commit 57a0e6543cd00c5b8a9c0ee5a9613596a7e8b78e)

hadoop-tools/hadoop-extras/src/test/java/org/apache/hadoop/tools/TestCopyFiles.java

@@ -60,7 +60,7 @@ public class TestCopyFiles extends TestCase {
   {
     ((Log4JLogger)LogFactory.getLog("org.apache.hadoop.hdfs.StateChange")
         ).getLogger().setLevel(Level.ERROR);
-    ((Log4JLogger)DataNode.LOG).getLogger().setLevel(Level.ERROR);
+    ((Log4JLogger)LogFactory.getLog(DataNode.class)).getLogger().setLevel(Level.ERROR);
     ((Log4JLogger)LogFactory.getLog(FSNamesystem.class)).getLogger().setLevel(Level.ERROR);
     ((Log4JLogger)DistCpV1.LOG).getLogger().setLevel(Level.ALL);
   }