HDFS-4993. Fsck can fail if a file is renamed or deleted. Contributed by Robert Parker.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1512451 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -304,6 +304,9 @@ Release 2.1.1-beta - UNRELEASED
     HDFS-5043. For HdfsFileStatus, set default value of childrenNum to -1
     instead of 0 to avoid confusing applications. (brandonli)
 
+    HDFS-4993. Fsck can fail if a file is renamed or deleted. (Robert Parker
+    via kihwal)
+
 Release 2.1.0-beta - 2013-08-06
 
   INCOMPATIBLE CHANGES

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

@@ -142,7 +142,7 @@ public class NamenodeFsck {
   /**
    * Filesystem checker.
    * @param conf configuration (namenode config)
-   * @param nn namenode that this fsck is going to use
+   * @param namenode namenode that this fsck is going to use
    * @param pmap key=value[] map passed to the http servlet as url parameters
    * @param out output stream to write the fsck output
    * @param totalDatanodes number of live datanodes
@@ -302,8 +302,13 @@ void check(String parent, HdfsFileStatus file, Result res) throws IOException {
     long fileLen = file.getLen();
     // Get block locations without updating the file access time 
     // and without block access tokens
-    LocatedBlocks blocks = namenode.getNamesystem().getBlockLocations(path, 0,
-        fileLen, false, false, false);
+    LocatedBlocks blocks;
+    try {
+      blocks = namenode.getNamesystem().getBlockLocations(path, 0,
+          fileLen, false, false, false);
+    } catch (FileNotFoundException fnfe) {
+      blocks = null;
+    }
     if (blocks == null) { // the file is deleted
       return;
     }

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

@@ -23,6 +23,7 @@
 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 java.io.BufferedReader;
 import java.io.ByteArrayOutputStream;
@@ -58,6 +59,7 @@
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSInputStream;
 import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
@@ -81,6 +83,8 @@
 import org.junit.Test;
 
 import com.google.common.collect.Sets;
+import org.mockito.Mockito;
+import static org.mockito.Mockito.*;
 
 /**
  * A JUnit test for doing fsck
@@ -876,6 +880,59 @@ public void testFsckMissingReplicas() throws IOException {
     }
   }
 
+  /** Test fsck with FileNotFound */
+  @Test
+  public void testFsckFileNotFound() throws Exception {
+
+    // Number of replicas to actually start
+    final short NUM_REPLICAS = 1;
+
+    Configuration conf = new Configuration();
+    NameNode namenode = mock(NameNode.class);
+    NetworkTopology nettop = mock(NetworkTopology.class);
+    Map<String,String[]> pmap = new HashMap<String, String[]>();
+    Writer result = new StringWriter();
+    PrintWriter out = new PrintWriter(result, true);
+    InetAddress remoteAddress = InetAddress.getLocalHost();
+    FSNamesystem fsName = mock(FSNamesystem.class);
+    when(namenode.getNamesystem()).thenReturn(fsName);
+    when(fsName.getBlockLocations(anyString(), anyLong(), anyLong(),
+        anyBoolean(), anyBoolean(), anyBoolean())).
+        thenThrow(new FileNotFoundException()) ;
+
+    NamenodeFsck fsck = new NamenodeFsck(conf, namenode, nettop, pmap, out,
+        NUM_REPLICAS, (short)1, remoteAddress);
+
+    String pathString = "/tmp/testFile";
+
+    long length = 123L;
+    boolean isDir = false;
+    int blockReplication = 1;
+    long blockSize = 128 *1024L;
+    long modTime = 123123123L;
+    long accessTime = 123123120L;
+    FsPermission perms = FsPermission.getDefault();
+    String owner = "foo";
+    String group = "bar";
+    byte [] symlink = null;
+    byte [] path = new byte[128];
+    path = DFSUtil.string2Bytes(pathString);
+    long fileId = 312321L;
+    int numChildren = 1;
+
+    HdfsFileStatus file = new HdfsFileStatus(length, isDir, blockReplication,
+        blockSize, modTime, accessTime, perms, owner, group, symlink, path,
+        fileId, numChildren);
+    Result res = new Result(conf);
+
+    try {
+      fsck.check(pathString, file, res);
+    } catch (Exception e) {
+      fail("Unexpected exception "+ e.getMessage());
+    }
+    assertTrue(res.toString().contains("HEALTHY"));
+  }
+
   /** Test fsck with symlinks in the filesystem */
   @Test
   public void testFsckSymlink() throws Exception {