HDFS-6527. Edit log corruption due to defered INode removal. Contributed by Jing Zhao and Kihwal Lee.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.4@1604257 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -89,6 +89,9 @@ Release 2.4.1 - 2014-06-23
     HDFS-6411. nfs-hdfs-gateway mount raises I/O error and hangs when a 
     unauthorized user attempts to access it (brandonli)
 
+    HDFS-6527. Edit log corruption due to defered INode removal. (kihwal and
+    jing9 via jing9)
+
 Release 2.4.0 - 2014-04-07 
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -2962,6 +2962,13 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
           + (lease != null ? lease.toString()
               : "Holder " + holder + " does not have any open files."));
     }
+    // No further modification is allowed on a deleted file.
+    // A file is considered deleted, if it has no parent or is marked
+    // as deleted in the snapshot feature.
+    if (file.getParent() == null || (file.isWithSnapshot() &&
+        file.getFileWithSnapshotFeature().isCurrentFileDeleted())) {
+      throw new FileNotFoundException(src);
+    }
     String clientName = file.getFileUnderConstructionFeature().getClientName();
     if (holder != null && !clientName.equals(holder)) {
       throw new LeaseExpiredException("Lease mismatch on " + src + " owned by "
@@ -3371,6 +3378,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
     getEditLog().logSync(); 
     removeBlocks(collectedBlocks); // Incremental deletion of blocks
     collectedBlocks.clear();
+
     dir.writeLock();
     try {
       dir.removeFromInodeMap(removedINodes);

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

@@ -0,0 +1,149 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs.server.namenode;
+
+import java.io.FileNotFoundException;
+import java.util.List;
+import java.util.Set;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.hdfs.HdfsConfiguration;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.StorageType;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault;
+import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeStorageInfo;
+import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotTestHelper;
+import org.apache.hadoop.net.Node;
+import org.apache.hadoop.test.GenericTestUtils;
+import org.junit.Assert;
+import org.junit.Test;
+import org.mockito.internal.util.reflection.Whitebox;
+
+
+/**
+ * Test race between delete and other operations.  For now only addBlock()
+ * is tested since all others are acquiring FSNamesystem lock for the 
+ * whole duration.
+ */
+public class TestDeleteRace {
+  private static final Log LOG = LogFactory.getLog(TestDeleteRace.class);
+  private static final Configuration conf = new HdfsConfiguration();
+  private MiniDFSCluster cluster;
+
+  @Test  
+  public void testDeleteAddBlockRace() throws Exception {
+    testDeleteAddBlockRace(false);
+  }
+
+  @Test  
+  public void testDeleteAddBlockRaceWithSnapshot() throws Exception {
+    testDeleteAddBlockRace(true);
+  }
+
+  private void testDeleteAddBlockRace(boolean hasSnapshot) throws Exception {
+    try {
+      conf.setClass(DFSConfigKeys.DFS_BLOCK_REPLICATOR_CLASSNAME_KEY,
+          SlowBlockPlacementPolicy.class, BlockPlacementPolicy.class);
+      cluster = new MiniDFSCluster.Builder(conf).build();
+      FileSystem fs = cluster.getFileSystem();
+      final String fileName = "/testDeleteAddBlockRace";
+      Path filePath = new Path(fileName);
+
+      FSDataOutputStream out = null;
+      out = fs.create(filePath);
+      if (hasSnapshot) {
+        SnapshotTestHelper.createSnapshot((DistributedFileSystem) fs, new Path(
+            "/"), "s1");
+      }
+
+      Thread deleteThread = new DeleteThread(fs, filePath);
+      deleteThread.start();
+
+      try {
+        // write data and syn to make sure a block is allocated.
+        out.write(new byte[32], 0, 32);
+        out.hsync();
+        Assert.fail("Should have failed.");
+      } catch (Exception e) {
+        GenericTestUtils.assertExceptionContains(filePath.getName(), e);
+      }
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
+  private static class SlowBlockPlacementPolicy extends
+      BlockPlacementPolicyDefault {
+    @Override
+    public DatanodeStorageInfo[] chooseTarget(String srcPath,
+                                      int numOfReplicas,
+                                      Node writer,
+                                      List<DatanodeStorageInfo> chosenNodes,
+                                      boolean returnChosenNodes,
+                                      Set<Node> excludedNodes,
+                                      long blocksize,
+                                      StorageType storageType) {
+      DatanodeStorageInfo[] results = super.chooseTarget(srcPath,
+          numOfReplicas, writer, chosenNodes, returnChosenNodes, excludedNodes,
+          blocksize, storageType);
+      try {
+        Thread.sleep(3000);
+      } catch (InterruptedException e) {}
+      return results;
+    }
+  }
+
+  private class DeleteThread extends Thread {
+    private FileSystem fs;
+    private Path path;
+
+    DeleteThread(FileSystem fs, Path path) {
+      this.fs = fs;
+      this.path = path;
+    }
+
+    @Override
+    public void run() {
+      try {
+        Thread.sleep(1000);
+        LOG.info("Deleting" + path);
+        final FSDirectory fsdir = cluster.getNamesystem().dir;
+        INode fileINode = fsdir.getINode4Write(path.toString());
+        INodeMap inodeMap = (INodeMap) Whitebox.getInternalState(fsdir,
+            "inodeMap");
+
+        fs.delete(path, false);
+        // after deletion, add the inode back to the inodeMap
+        inodeMap.put(fileINode);
+        LOG.info("Deleted" + path);
+      } catch (Exception e) {
+        LOG.info(e);
+      }
+    }
+  }
+}