Revert "HDFS-14706. Checksums are not checked if block meta file is less than 7 bytes. Contributed by Stephen O'Donnell."

This reverts commit 9c0d6e1657.

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java

@@ -23,7 +23,6 @@ import java.io.InterruptedIOException;
 import java.nio.ByteBuffer;
 import java.nio.channels.ClosedChannelException;
 import java.util.EnumSet;
-import java.util.Random;
 import java.util.concurrent.atomic.AtomicReference;
 
 import org.apache.hadoop.HadoopIllegalArgumentException;
@@ -127,8 +126,6 @@ public class DFSOutputStream extends FSOutputSummer
   protected final AtomicReference<CachingStrategy> cachingStrategy;
   private FileEncryptionInfo fileEncryptionInfo;
   private int writePacketSize;
-  private boolean leaseRecovered = false;
-  private boolean exceptionInClose = false; //for unit test
 
   /** Use {@link ByteArrayManager} to create buffer for non-heartbeat packets.*/
   protected DFSPacket createPacket(int packetSize, int chunksPerPkt,
@@ -835,39 +832,6 @@ public class DFSOutputStream extends FSOutputSummer
     }
   }
 
-  @VisibleForTesting
-  public void setExceptionInClose(boolean enable) {
-    exceptionInClose = enable;
-  }
-
-  private class EmulateExceptionInClose {
-    private Random rand = null;
-    private int kickedNum;
-
-    EmulateExceptionInClose(int callNum) {
-      if (exceptionInClose) {
-        rand = new Random();
-      }
-      kickedNum = callNum;
-    }
-
-    void kickRandomException() throws IOException {
-      if (exceptionInClose) {
-        if (kickedNum > 0) {
-          if (rand.nextInt(kickedNum) == 1) {
-            throw new IOException("Emulated random IOException in close");
-          }
-        }
-      }
-    }
-
-    void kickException() throws IOException {
-      if (exceptionInClose) {
-        throw new IOException("Emulated IOException in close");
-      }
-    }
-  }
-
   /**
    * Closes this output stream and releases any system
    * resources associated with this stream.
@@ -890,20 +854,7 @@ public class DFSOutputStream extends FSOutputSummer
   }
 
   protected synchronized void closeImpl() throws IOException {
-    boolean recoverOnCloseException = dfsClient.getConfiguration().getBoolean(
-        HdfsClientConfigKeys.Write.RECOVER_ON_CLOSE_EXCEPTION_KEY,
-        HdfsClientConfigKeys.Write.RECOVER_ON_CLOSE_EXCEPTION_DEFAULT);
     if (isClosed()) {
-      if (recoverOnCloseException && !leaseRecovered) {
-        try {
-          dfsClient.endFileLease(fileId);
-          dfsClient.recoverLease(src);
-          leaseRecovered = true;
-        } catch (Exception e) {
-          LOG.warn("Fail to recover lease for {}", src, e);
-        }
-      }
-
       LOG.debug("Closing an already closed stream. [Stream:{}, streamer:{}]",
           closed, getStreamer().streamerClosed());
       try {
@@ -920,11 +871,8 @@ public class DFSOutputStream extends FSOutputSummer
       return;
     }
 
-    EmulateExceptionInClose eei = new EmulateExceptionInClose(5);
     try {
-      flushBuffer(); // flush from all upper layers
+      flushBuffer();       // flush from all upper layers
-      // for test
-      eei.kickRandomException();
 
       if (currentPacket != null) {
         enqueueCurrentPacket();
@@ -935,28 +883,12 @@ public class DFSOutputStream extends FSOutputSummer
       }
 
       try {
-        flushInternal(); // flush all data to Datanodes
+        flushInternal();             // flush all data to Datanodes
       } catch (IOException ioe) {
         cleanupAndRethrowIOException(ioe);
       }
-      // for test
-      eei.kickRandomException();
       completeFile();
-      // for test
-      eei.kickException();
     } catch (ClosedChannelException ignored) {
-    } catch (IOException ioe) {
-      if (recoverOnCloseException) {
-        try {
-          dfsClient.endFileLease(fileId);
-          dfsClient.recoverLease(src);
-          leaseRecovered = true;
-        } catch (Exception e) {
-          // Ignore exception rendered by recoverLease. Throw original
-          // exception
-        }
-      }
-      throw ioe;
     } finally {
       // Failures may happen when flushing data.
       // Streamers may keep waiting for the new block information.

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/HdfsClientConfigKeys.java

@@ -302,9 +302,6 @@ public interface HdfsClientConfigKeys {
     String  EXCLUDE_NODES_CACHE_EXPIRY_INTERVAL_KEY =
         PREFIX + "exclude.nodes.cache.expiry.interval.millis";
     long    EXCLUDE_NODES_CACHE_EXPIRY_INTERVAL_DEFAULT = 10*MINUTE;
-    String RECOVER_ON_CLOSE_EXCEPTION_KEY =
-        PREFIX + "recover.on.close.exception";
-    boolean RECOVER_ON_CLOSE_EXCEPTION_DEFAULT = false;
 
     interface ByteArrayManager {
       String PREFIX = Write.PREFIX + "byte-array-manager.";

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

@@ -31,7 +31,6 @@ import java.util.LinkedList;
 import java.util.Map;
 import java.util.Random;
 
-import org.apache.commons.lang3.reflect.FieldUtils;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.CreateFlag;
 import org.apache.hadoop.fs.FSDataOutputStream;
@@ -41,7 +40,6 @@ import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.StreamCapabilities.StreamCapability;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.DataStreamer.LastExceptionInStreamer;
-import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.hdfs.client.impl.DfsClientConf;
 import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
@@ -373,41 +371,6 @@ public class TestDFSOutputStream {
     os.close();
   }
 
-  /**
-   * If dfs.client.recover-on-close-exception.enable is set and exception
-   * happens in close, the local lease should be closed and lease in namenode
-   * should be recovered.
-   */
-  @Test
-  public void testExceptionInClose() throws Exception {
-    String testStr = "Test exception in close";
-    DistributedFileSystem fs = cluster.getFileSystem();
-    Path testFile = new Path("/closeexception");
-    fs.getConf().setBoolean(
-        HdfsClientConfigKeys.Write.RECOVER_ON_CLOSE_EXCEPTION_KEY, true);
-    FSDataOutputStream os = fs.create(testFile);
-    DFSOutputStream dos =
-        (DFSOutputStream) FieldUtils.readField(os, "wrappedStream", true);
-    dos.setExceptionInClose(true);
-    os.write(testStr.getBytes());
-    try {
-      dos.close();
-      // There should be exception
-      Assert.assertTrue(false);
-    } catch (IOException ioe) {
-      GenericTestUtils.waitFor(() -> {
-        boolean closed;
-        try {
-          closed = fs.isFileClosed(testFile);
-        } catch (IOException e) {
-          return false;
-        }
-        return closed;
-      }, 1000, 5000);
-      Assert.assertTrue(fs.isFileClosed(testFile));
-    }
-  }
-
   @AfterClass
   public static void tearDown() {
     if (cluster != null) {