HDFS-9515. NPE when MiniDFSCluster#shutdown is invoked on uninitialized reference. (Contributed by Wei-Chiu Chuang)

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -2510,6 +2510,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-9570. Minor typos, grammar, and case sensitivity cleanup in
     HdfsPermissionsGuide.md's (Travis Campbell via aw)
 
+    HDFS-9515. NPE when MiniDFSCluster#shutdown is invoked on uninitialized
+    reference. (Wei-Chiu Chuang via Arpit Agarwal)
+
 Release 2.7.3 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/contrib/bkjournal/src/test/java/org/apache/hadoop/contrib/bkjournal/TestBootstrapStandbyWithBKJM.java

@@ -63,6 +63,7 @@ public class TestBootstrapStandbyWithBKJM {
   public void teardown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/TestRefreshCallQueue.java

@@ -86,6 +86,7 @@ public class TestRefreshCallQueue {
   public void tearDown() throws Exception {
     if(cluster!=null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/cli/TestAclCLI.java

@@ -49,9 +49,11 @@ public class TestAclCLI extends CLITestHelperDFS {
     super.tearDown();
     if (fs != null) {
       fs.close();
+      fs = null;
     }
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/cli/TestCacheAdminCLI.java

@@ -76,9 +76,11 @@ public class TestCacheAdminCLI extends CLITestHelper {
   public void tearDown() throws Exception {
     if (fs != null) {
       fs.close();
+      fs = null;
     }
     if (dfsCluster != null) {
       dfsCluster.shutdown();
+      dfsCluster = null;
     }
     Thread.sleep(2000);
     super.tearDown();

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/cli/TestCryptoAdminCLI.java

@@ -86,9 +86,11 @@ public class TestCryptoAdminCLI extends CLITestHelperDFS {
   public void tearDown() throws Exception {
     if (fs != null) {
       fs.close();
+      fs = null;
     }
     if (dfsCluster != null) {
       dfsCluster.shutdown();
+      dfsCluster = null;
     }
     Thread.sleep(2000);
     super.tearDown();

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/cli/TestDeleteCLI.java

@@ -58,9 +58,11 @@ public class TestDeleteCLI extends CLITestHelperDFS {
   public void tearDown() throws Exception {
     if (fs != null) {
       fs.close();
+      fs = null;
     }
     if (dfsCluster != null) {
       dfsCluster.shutdown();
+      dfsCluster = null;
     }
     Thread.sleep(2000);
     super.tearDown();

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/cli/TestErasureCodingCLI.java

@@ -61,9 +61,11 @@ public class TestErasureCodingCLI extends CLITestHelper {
   public void tearDown() throws Exception {
     if (fs != null) {
       fs.close();
+      fs = null;
     }
     if (dfsCluster != null) {
       dfsCluster.shutdown();
+      dfsCluster = null;
     }
     Thread.sleep(2000);
     super.tearDown();

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/cli/TestHDFSCLI.java

@@ -77,9 +77,11 @@ public class TestHDFSCLI extends CLITestHelperDFS {
   public void tearDown() throws Exception {
     if (fs != null) {
       fs.close();
+      fs = null;
     }
     if (dfsCluster != null) {
       dfsCluster.shutdown();
+      dfsCluster = null;
     }
     Thread.sleep(2000);
     super.tearDown();

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/cli/TestXAttrCLI.java

@@ -67,9 +67,11 @@ public class TestXAttrCLI  extends CLITestHelperDFS {
   public void tearDown() throws Exception {
     if (fs != null) {
       fs.close();
+      fs = null;
     }
     if (dfsCluster != null) {
       dfsCluster.shutdown();
+      dfsCluster = null;
     }
     Thread.sleep(2000);
     super.tearDown();

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestFcHdfsCreateMkdir.java

@@ -58,7 +58,9 @@ public class TestFcHdfsCreateMkdir extends
       
   @AfterClass
   public static void ClusterShutdownAtEnd() throws Exception {
-    cluster.shutdown();   
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
   
   @Override

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestFcHdfsPermission.java

@@ -65,7 +65,9 @@ public class TestFcHdfsPermission extends FileContextPermissionBase {
       
   @AfterClass
   public static void ClusterShutdownAtEnd() throws Exception {
-    cluster.shutdown();   
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
   
   @Override

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestFcHdfsSetUMask.java

@@ -96,7 +96,9 @@ public class TestFcHdfsSetUMask {
 
   @AfterClass
   public static void ClusterShutdownAtEnd() throws Exception {
-    cluster.shutdown();   
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
   
   {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestSymlinkHdfs.java

@@ -96,7 +96,9 @@ abstract public class TestSymlinkHdfs extends SymlinkBaseTest {
 
   @AfterClass
   public static void afterClassTeardown() throws Exception {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
 
   @Test(timeout=10000)

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/contract/hdfs/HDFSContract.java

@@ -62,6 +62,7 @@ public class HDFSContract extends AbstractFSContract {
   public static void destroyCluster() throws IOException {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/shell/TestHdfsTextCommand.java

@@ -60,9 +60,11 @@ public class TestHdfsTextCommand {
     public void tearDown() throws IOException{
     if(fs != null){
       fs.close();
+      fs = null;
     }
     if(cluster != null){
       cluster.shutdown();
+      cluster = null;
     }
   }
   

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFileSystemHdfs.java

@@ -88,7 +88,9 @@ public class TestViewFileSystemHdfs extends ViewFileSystemBaseTest {
       
   @AfterClass
   public static void ClusterShutdownAtEnd() throws Exception {
-    cluster.shutdown();   
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
 
   @Override

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFileSystemWithAcls.java

@@ -76,7 +76,9 @@ public class TestViewFileSystemWithAcls {
 
   @AfterClass
   public static void ClusterShutdownAtEnd() throws Exception {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
 
   @Before

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFileSystemWithXAttrs.java

@@ -71,7 +71,9 @@ public class TestViewFileSystemWithXAttrs {
 
   @AfterClass
   public static void ClusterShutdownAtEnd() throws Exception {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
 
   @Before

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFsAtHdfsRoot.java

@@ -64,7 +64,9 @@ public class TestViewFsAtHdfsRoot extends ViewFsBaseTest {
       
   @AfterClass
   public static void ClusterShutdownAtEnd() throws Exception {
-    cluster.shutdown();   
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
 
   @Override

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFsHdfs.java

@@ -64,7 +64,9 @@ public class TestViewFsHdfs extends ViewFsBaseTest {
       
   @AfterClass
   public static void ClusterShutdownAtEnd() throws Exception {
-    cluster.shutdown();   
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
 
   @Override

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFsWithAcls.java

@@ -76,7 +76,9 @@ public class TestViewFsWithAcls {
 
   @AfterClass
   public static void ClusterShutdownAtEnd() throws Exception {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
 
   @Before

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFsWithXAttrs.java

@@ -70,7 +70,9 @@ public class TestViewFsWithXAttrs {
 
   @AfterClass
   public static void ClusterShutdownAtEnd() throws Exception {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
 
   @Before

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/FileAppendTest4.java

@@ -68,7 +68,9 @@ public class FileAppendTest4 {
 
   @AfterClass
   public static void tearDown() {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
   
   /**

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestAbandonBlock.java

@@ -56,8 +56,14 @@ public class TestAbandonBlock {
 
   @After
   public void tearDown() throws Exception {
-    fs.close();
-    cluster.shutdown();
+    if (fs != null) {
+      fs.close();
+      fs = null;
+    }
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
 
   @Test

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestBlocksScheduledCounter.java

@@ -43,9 +43,11 @@ public class TestBlocksScheduledCounter {
   public void tearDown() throws IOException {
     if (fs != null) {
       fs.close();
+      fs = null;
     }
     if(cluster!=null){
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestClientReportBadBlock.java

@@ -82,8 +82,14 @@ public class TestClientReportBadBlock {
 
   @After
   public void shutDownCluster() throws IOException {
-    dfs.close();
-    cluster.shutdown();
+    if (dfs != null) {
+      dfs.close();
+      dfs = null;
+    }
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
 
   /*

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSClientExcludedNodes.java

@@ -54,6 +54,7 @@ public class TestDFSClientExcludedNodes {
   public void tearDown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSClientFailover.java

@@ -88,6 +88,7 @@ public class TestDFSClientFailover {
   public void tearDownCluster() throws IOException {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSClientSocketSize.java

@@ -82,6 +82,7 @@ public class TestDFSClientSocketSize {
     if (cluster != null) {
       LOG.info("Shutting down MiniDFSCluster.");
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSFinalize.java

@@ -188,7 +188,10 @@ public class TestDFSFinalize {
   @After
   public void tearDown() throws Exception {
     LOG.info("Shutting down MiniDFSCluster");
-    if (cluster != null) cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
   
   public static void main(String[] args) throws Exception {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSOutputStream.java

@@ -150,6 +150,8 @@ public class TestDFSOutputStream {
 
   @AfterClass
   public static void tearDown() {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
 }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSPermission.java

@@ -123,6 +123,7 @@ public class TestDFSPermission {
   public void tearDown() throws IOException {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
   

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSRollback.java

@@ -346,7 +346,10 @@ public class TestDFSRollback {
   @After
   public void tearDown() throws Exception {
     LOG.info("Shutting down MiniDFSCluster");
-    if (cluster != null) cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
   
   public static void main(String[] args) throws Exception {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStartupVersions.java

@@ -282,7 +282,10 @@ public class TestDFSStartupVersions {
   @After
   public void tearDown() throws Exception {
     LOG.info("Shutting down MiniDFSCluster");
-    if (cluster != null) cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
   
   public static void main(String[] args) throws Exception {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStorageStateRecovery.java

@@ -452,6 +452,9 @@ public class TestDFSStorageStateRecovery {
   @After
   public void tearDown() throws Exception {
     LOG.info("Shutting down MiniDFSCluster");
-    if (cluster != null) cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
 }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStripedInputStream.java

@@ -86,6 +86,7 @@ public class TestDFSStripedInputStream {
   public void tearDown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSStripedOutputStream.java

@@ -69,6 +69,7 @@ public class TestDFSStripedOutputStream {
   public void tearDown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDataTransferKeepalive.java

@@ -69,7 +69,10 @@ public class TestDataTransferKeepalive {
   
   @After
   public void teardown() {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
   
   /**

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDecommission.java

@@ -126,6 +126,7 @@ public class TestDecommission {
     cleanupFile(localFileSys, dir);
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
   

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestEncryptionZones.java

@@ -170,6 +170,7 @@ public class TestEncryptionZones {
   public void teardown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
     EncryptionFaultInjector.instance = new EncryptionFaultInjector();
   }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestEncryptionZonesWithHA.java

@@ -87,6 +87,7 @@ public class TestEncryptionZonesWithHA {
   public void shutdownCluster() throws IOException {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestErasureCodingPolicies.java

@@ -61,6 +61,7 @@ public class TestErasureCodingPolicies {
   public void shutdownCluster() throws IOException {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestErasureCodingPolicyWithSnapshot.java

@@ -57,6 +57,7 @@ public class TestErasureCodingPolicyWithSnapshot {
   public void shutdownCluster() throws IOException {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileConcurrentReader.java

@@ -84,8 +84,10 @@ public class TestFileConcurrentReader {
 
   @After
   public void tearDown() throws Exception {
-    cluster.shutdown();
-    cluster = null;
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
 
   private void init(Configuration conf) throws IOException {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileStatus.java

@@ -77,8 +77,12 @@ public class TestFileStatus {
   
   @AfterClass
   public static void testTearDown() throws Exception {
-    fs.close();
-    cluster.shutdown();
+    if (fs != null) {
+      fs.close();
+    }
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
   
   private void checkFile(FileSystem fileSys, Path name, int repl)

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileStatusWithECPolicy.java

@@ -50,6 +50,7 @@ public class TestFileStatusWithECPolicy {
   public void after() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestGetFileChecksum.java

@@ -52,6 +52,7 @@ public class TestGetFileChecksum {
   public void tearDown() throws Exception {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestHDFSFileSystemContract.java

@@ -45,8 +45,10 @@ public class TestHDFSFileSystemContract extends FileSystemContractBaseTest {
   @Override
   protected void tearDown() throws Exception {
     super.tearDown();
-    cluster.shutdown();
-    cluster = null;
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
 
   @Override

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestHdfsAdmin.java

@@ -47,6 +47,7 @@ public class TestHdfsAdmin {
   public void shutDownCluster() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLeaseRecovery.java

@@ -57,6 +57,7 @@ public class TestLeaseRecovery {
   public void shutdown() throws IOException {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLeaseRecovery2.java

@@ -101,8 +101,10 @@ public class TestLeaseRecovery2 {
    */
   @AfterClass
   public static void tearDown() throws IOException {
-    IOUtils.closeStream(dfs);
-    if (cluster != null) {cluster.shutdown();}
+    if (cluster != null) {
+      IOUtils.closeStream(dfs);
+      cluster.shutdown();
+    }
   }
 
   /**

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestListFilesInDFS.java

@@ -46,8 +46,10 @@ public class TestListFilesInDFS extends TestListFiles {
   
   @AfterClass
   public static void testShutdown() throws Exception {
-    fs.close();
-    cluster.shutdown();
+    if (cluster != null) {
+      fs.close();
+      cluster.shutdown();
+    }
   }
   
   protected static Path getTestDir() {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestListFilesInFileContext.java

@@ -83,7 +83,9 @@ public class TestListFilesInFileContext {
   
   @AfterClass
   public static void testShutdown() throws Exception {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
 
   /** Test when input path is a file */

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestPipelines.java

@@ -65,11 +65,14 @@ public class TestPipelines {
 
   @After
   public void shutDownCluster() throws IOException {
-    if (fs != null)
+    if (fs != null) {
       fs.close();
+      fs = null;
+    }
     if (cluster != null) {
       cluster.shutdownDataNodes();
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestReadStripedFileWithDecoding.java

@@ -77,6 +77,7 @@ public class TestReadStripedFileWithDecoding {
   public void tearDown() throws IOException {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestReadStripedFileWithMissingBlocks.java

@@ -61,6 +61,7 @@ public class TestReadStripedFileWithMissingBlocks {
   public void tearDown() throws IOException {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestRecoverStripedFile.java

@@ -97,6 +97,7 @@ public class TestRecoverStripedFile {
   public void tearDown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
   

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestReservedRawPaths.java

@@ -91,6 +91,7 @@ public class TestReservedRawPaths {
   public void teardown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSafeMode.java

@@ -90,9 +90,11 @@ public class TestSafeMode {
   public void tearDown() throws IOException {
     if (fs != null) {
       fs.close();
+      fs = null;
     }
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSafeModeWithStripedFile.java

@@ -63,6 +63,7 @@ public class TestSafeModeWithStripedFile {
   public void tearDown() throws IOException {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestWriteRead.java

@@ -86,7 +86,10 @@ public class TestWriteRead {
 
   @After
   public void shutdown() {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
 
   // Equivalence of @Before for cluster mode testing.

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestWriteReadStripedFile.java

@@ -76,6 +76,7 @@ public class TestWriteReadStripedFile {
   public void tearDown() throws IOException {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/protocol/datatransfer/sasl/TestSaslDataTransfer.java

@@ -67,6 +67,7 @@ public class TestSaslDataTransfer extends SaslDataTransferTestCase {
     IOUtils.cleanup(null, fs);
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/qjournal/TestSecureNNWithQJM.java

@@ -154,9 +154,11 @@ public class TestSecureNNWithQJM {
     IOUtils.cleanup(null, fs);
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
     if (mjc != null) {
       mjc.shutdown();
+      mjc = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/qjournal/client/TestQuorumJournalManager.java

@@ -114,6 +114,7 @@ public class TestQuorumJournalManager {
     
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
   

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/qjournal/server/TestJournalNodeMXBean.java

@@ -61,6 +61,7 @@ public class TestJournalNodeMXBean {
   public void cleanup() throws IOException {
     if (jCluster != null) {
       jCluster.shutdown();
+      jCluster = null;
     }
   }
   

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/security/TestDelegationToken.java

@@ -84,6 +84,7 @@ public class TestDelegationToken {
   public void tearDown() throws Exception {
     if(cluster!=null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockStatsMXBean.java

@@ -67,6 +67,7 @@ public class TestBlockStatsMXBean {
   public void tearDown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestComputeInvalidateWork.java

@@ -70,6 +70,7 @@ public class TestComputeInvalidateWork {
   public void teardown() throws Exception {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestPendingInvalidateBlock.java

@@ -74,6 +74,7 @@ public class TestPendingInvalidateBlock {
   public void tearDown() throws Exception {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestSequentialBlockGroupId.java

@@ -93,6 +93,7 @@ public class TestSequentialBlockGroupId {
   public void teardown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

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

@@ -115,10 +115,12 @@ public abstract class BlockReportTestBase {
   public void shutDownCluster() throws IOException {
     if (fs != null) {
       fs.close();
+      fs = null;
     }
     if (cluster != null) {
       cluster.shutdownDataNodes();
       cluster.shutdown();
+      cluster = null;
     }
   }
 

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

@@ -59,8 +59,10 @@ public class TestDataNodeExit {
 
   @After
   public void tearDown() throws Exception {
-    if (cluster != null)
+    if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
+    }
   }
   
   private void stopBPServiceThreads(int numStopThreads, DataNode dn)

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

@@ -116,12 +116,15 @@ public class TestDataNodeVolumeFailure {
   public void tearDown() throws Exception {
     if(data_fail != null) {
       FileUtil.setWritable(data_fail, true);
+      data_fail = null;
     }
     if(failedDir != null) {
       FileUtil.setWritable(failedDir, true);
+      failedDir = null;
     }
     if(cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
   

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

@@ -89,6 +89,7 @@ public class TestDataNodeVolumeFailureReporting {
     IOUtils.cleanup(LOG, fs);
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

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

@@ -78,6 +78,7 @@ public class TestDataNodeVolumeFailureToleration {
   public void tearDown() throws Exception {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

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

@@ -71,7 +71,10 @@ public class TestDiskError {
 
   @After
   public void tearDown() throws Exception {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
 
   /**

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

@@ -149,9 +149,11 @@ public class TestFsDatasetCache {
     DFSTestUtil.verifyExpectedCacheUsage(0, 0, fsd);
     if (fs != null) {
       fs.close();
+      fs = null;
     }
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
     // Restore the original CacheManipulator
     NativeIO.POSIX.setCacheManipulator(prevCacheManipulator);

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

@@ -101,10 +101,13 @@ public class TestIncrementalBrVariations {
 
   @After
   public void shutDownCluster() throws IOException {
-    client.close();
-    fs.close();
-    cluster.shutdownDataNodes();
-    cluster.shutdown();
+    if (cluster != null) {
+      client.close();
+      fs.close();
+      cluster.shutdownDataNodes();
+      cluster.shutdown();
+      cluster = null;
+    }
   }
 
   /**

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestAclConfigFlag.java

@@ -58,6 +58,7 @@ public class TestAclConfigFlag {
     IOUtils.cleanup(null, fs);
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestAddBlock.java

@@ -60,6 +60,7 @@ public class TestAddBlock {
   public void tearDown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
   

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestAddBlockRetry.java

@@ -66,6 +66,7 @@ public class TestAddBlockRetry {
   public void tearDown() throws Exception {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestAddOverReplicatedStripedBlocks.java

@@ -75,6 +75,7 @@ public class TestAddOverReplicatedStripedBlocks {
   public void tearDown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestAddStripedBlocks.java

@@ -82,6 +82,7 @@ public class TestAddStripedBlocks {
   public void tearDown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestAuditLogs.java

@@ -137,8 +137,14 @@ public class TestAuditLogs {
   @After
   public void teardownCluster() throws Exception {
     util.cleanup(fs, "/srcdat");
-    fs.close();
-    cluster.shutdown();
+    if (fs != null) {
+      fs.close();
+      fs = null;
+    }
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
 
   /** test that allowed operation puts proper entry in audit log */

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestBackupNode.java

@@ -494,7 +494,9 @@ public class TestBackupNode {
       assertTrue(e.getLocalizedMessage(), false);
     } finally {
       fileSys.close();
-      cluster.shutdown();
+      if (cluster != null) {
+        cluster.shutdown();
+      }
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestBlockPlacementPolicyRackFaultTolerant.java

@@ -83,6 +83,7 @@ public class TestBlockPlacementPolicyRackFaultTolerant {
   public void teardown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCacheDirectives.java

@@ -158,6 +158,7 @@ public class TestCacheDirectives {
     waitForCachedBlocks(namenode, 0, 0, "teardown");
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
     // Restore the original CacheManipulator
     NativeIO.POSIX.setCacheManipulator(prevCacheManipulator);

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCommitBlockWithInvalidGenStamp.java

@@ -58,6 +58,7 @@ public class TestCommitBlockWithInvalidGenStamp {
   public void tearDown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDeadDatanode.java

@@ -62,7 +62,10 @@ public class TestDeadDatanode {
 
   @After
   public void cleanup() {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
 
   /**

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDefaultBlockPlacementPolicy.java

@@ -71,6 +71,7 @@ public class TestDefaultBlockPlacementPolicy {
   public void teardown() {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDiskspaceQuotaUpdate.java

@@ -71,6 +71,7 @@ public class TestDiskspaceQuotaUpdate {
   public void tearDown() throws Exception {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestEditLogAutoroll.java

@@ -97,9 +97,11 @@ public class TestEditLogAutoroll {
   public void tearDown() throws Exception {
     if (fs != null) {
       fs.close();
+      fs = null;
     }
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestEditLogJournalFailures.java

@@ -70,11 +70,14 @@ public class TestEditLogJournalFailures {
   
   @After
   public void shutDownMiniCluster() throws IOException {
-    if (fs != null)
+    if (fs != null) {
       fs.close();
+      fs = null;
+    }
     if (cluster != null) {
       try {
         cluster.shutdown();
+        cluster = null;
       } catch (ExitException ee) {
         // Ignore ExitExceptions as the tests may result in the
         // NameNode doing an immediate shutdown.

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSDirectory.java

@@ -108,6 +108,7 @@ public class TestFSDirectory {
   public void tearDown() throws Exception {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSImageWithAcl.java

@@ -55,7 +55,9 @@ public class TestFSImageWithAcl {
 
   @AfterClass
   public static void tearDown() {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
 
   private void testAcl(boolean persistNamespace) throws IOException {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSImageWithSnapshot.java

@@ -89,6 +89,7 @@ public class TestFSImageWithSnapshot {
   public void tearDown() throws Exception {
     if (cluster != null) {
       cluster.shutdown();
+      cluster = null;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSImageWithXAttr.java

@@ -62,7 +62,9 @@ public class TestFSImageWithXAttr {
 
   @AfterClass
   public static void tearDown() {
-    cluster.shutdown();
+    if (cluster != null) {
+      cluster.shutdown();
+    }
   }
 
   private void testXAttr(boolean persistNamespace) throws IOException {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFileTruncate.java

@@ -110,8 +110,14 @@ public class TestFileTruncate {
 
   @After
   public void tearDown() throws IOException {
-    if(fs != null)      fs.close();
-    if(cluster != null) cluster.shutdown();
+    if(fs != null) {
+      fs.close();
+      fs = null;
+    }
+    if(cluster != null) {
+      cluster.shutdown();
+      cluster = null;
+    }
   }
 
   /**