HADOOP-8185. Merging change r1389010 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1609853 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java

@@ -93,6 +93,7 @@ import com.google.common.collect.Lists;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceAudience.LimitedPrivate;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.BlockLocation;
 import org.apache.hadoop.fs.BlockStorageLocation;
@@ -893,6 +894,17 @@ public class DFSClient implements java.io.Closeable, RemotePeerFactory {
     }
   }
 
+  /**
+   * Close all open streams, abandoning all of the leases and files being
+   * created.
+   * @param abort whether streams should be gracefully closed
+   */
+  public void closeOutputStreams(boolean abort) {
+    if (clientRunning) {
+      closeAllFilesBeingWritten(abort);
+    }
+  }
+
   /**
    * Get the default block size for this cluster
    * @return the default block size in bytes

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java

@@ -846,10 +846,10 @@ public class DistributedFileSystem extends FileSystem {
   @Override
   public void close() throws IOException {
     try {
-      super.processDeleteOnExit();
+      dfs.closeOutputStreams(false);
-      dfs.close();
-    } finally {
       super.close();
+    } finally {
+      dfs.close();
     }
   }
 

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

@@ -24,7 +24,9 @@ import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
-
+import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.inOrder;
+import static org.mockito.Mockito.mock;
 
 import java.io.File;
 import java.io.FileNotFoundException;
@@ -70,6 +72,7 @@ import org.apache.hadoop.util.DataChecksum;
 import org.apache.hadoop.util.Time;
 import org.apache.log4j.Level;
 import org.junit.Test;
+import org.mockito.InOrder;
 import org.mockito.Mockito;
 import org.mockito.invocation.InvocationOnMock;
 import org.mockito.stubbing.Answer;
@@ -169,7 +172,31 @@ public class TestDistributedFileSystem {
       if (cluster != null) {cluster.shutdown();}
     }
   }
+
+  @Test
+  public void testDFSCloseOrdering() throws Exception {
+    DistributedFileSystem fs = new MyDistributedFileSystem();
+    Path path = new Path("/a");
+    fs.deleteOnExit(path);
+    fs.close();
+
+    InOrder inOrder = inOrder(fs.dfs);
+    inOrder.verify(fs.dfs).closeOutputStreams(eq(false));
+    inOrder.verify(fs.dfs).delete(eq(path.toString()), eq(true));
+    inOrder.verify(fs.dfs).close();
+  }
   
+  private static class MyDistributedFileSystem extends DistributedFileSystem {
+    MyDistributedFileSystem() {
+      statistics = new FileSystem.Statistics("myhdfs"); // can't mock finals
+      dfs = mock(DFSClient.class);
+    }
+    @Override
+    public boolean exists(Path p) {
+      return true; // trick out deleteOnExit
+    }
+  }
+
   @Test
   public void testDFSSeekExceptions() throws IOException {
     Configuration conf = getTestConfiguration();