YARN-11894 clean up file system before and after each state to address order dependency if other tests are run in between test class.

Author: pacoc2

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timeline-pluginstorage/src/test/java/org/apache/hadoop/yarn/server/timeline/TestLogInfo.java

@@ -77,6 +77,7 @@ public class TestLogInfo {
 
   @BeforeEach
   public void setup() throws Exception {
+    prepareCleanTestRootDir();
     config.set(MiniDFSCluster.HDFS_MINIDFS_BASEDIR, TEST_ROOT_DIR.toString());
     HdfsConfiguration hdfsConfig = new HdfsConfiguration();
     hdfsCluster = new MiniDFSCluster.Builder(hdfsConfig).numDataNodes(1).build();
@@ -106,7 +107,25 @@ public void tearDown() throws Exception {
     jsonGenerator.close();
     outStream.close();
     outStreamDomain.close();
+
+    FileSystem hdfsFs = hdfsCluster.getFileSystem();
+    if (hdfsFs.exists(TEST_ROOT_DIR)) {
+      hdfsFs.delete(TEST_ROOT_DIR, true);
+    }
     hdfsCluster.shutdown();
+
+    FileSystem localFs = FileSystem.getLocal(config);
+    if (localFs.exists(TEST_ROOT_DIR)) {
+        localFs.delete(TEST_ROOT_DIR, true);
+    }
+  }
+    
+  /**
+   * Creates a fresh test root directory after cleanup.
+   */
+  private void prepareCleanTestRootDir() throws IOException {
+      FileSystem localFs = FileSystem.getLocal(config);
+      localFs.mkdirs(TEST_ROOT_DIR);
   }
 
   @Test
@@ -245,5 +264,5 @@ private Path getTestRootPath() {
   private Path getTestRootPath(String pathString) {
     return fileContextTestHelper.getTestRootPath(fc, pathString);
   }
-
-}
+  
+}