amahussein commented on a change in pull request #2722:
URL: https://github.com/apache/hadoop/pull/2722#discussion_r582373195



##########
File path: 
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/test/GenericTestUtils.java
##########
@@ -229,6 +229,31 @@ public static int uniqueSequenceId() {
     return sequence.incrementAndGet();
   }
 
+  /**
+   * Creates a directory for the data/logs of the unit test.
+   * It first delete the directory if it exists.
+   *
+   * @param testClass the unit test class.
+   * @param defaultTargetRootDir the directory where the class directory is
+   *                             created.
+   * @return the Path of the root directory.
+   */
+  public static Path setupTestRootDir(Class<?> testClass,
+      String defaultTargetRootDir) {
+    // setup the test root directory
+    String targetTestDir =
+        System.getProperty(SYSPROP_TEST_DATA_DIR, defaultTargetRootDir);
+    Path testRootDirPath =
+        new Path(targetTestDir, testClass.getSimpleName());
+    System.setProperty(GenericTestUtils.SYSPROP_TEST_DATA_DIR,
+        testRootDirPath.toString());

Review comment:
       There has to be a global parameter so that all the modules will use the 
desired folder. The property is being read everywhere by different modules and 
this ends up picking different directories.




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