HDFS-7830. DataNode does not release the volume lock when adding a volume fails. (Lei Xu via Colin P. McCabe)

(cherry picked from commit 5c1036d598)

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

@@ -827,6 +827,9 @@ Release 2.7.0 - UNRELEASED
     HDFS-7818. OffsetParam should return the default value instead of throwing
     NPE when the value is unspecified. (Eric Payne via wheat9)
 
+    HDFS-7830. DataNode does not release the volume lock when adding a volume
+    fails. (Lei Xu via Colin P. Mccabe)
+
     BREAKDOWN OF HDFS-7584 SUBTASKS AND RELATED JIRAS
 
       HDFS-7720. Quota by Storage Type API, tools and ClientNameNode

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/Storage.java

@@ -672,7 +672,7 @@ public abstract class Storage extends StorageInfo {
      */
     public void lock() throws IOException {
       if (isShared()) {
-        LOG.info("Locking is disabled");
+        LOG.info("Locking is disabled for " + this.root);
         return;
       }
       FileLock newLock = tryLock();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java

@@ -47,6 +47,7 @@ import javax.management.NotCompliantMBeanException;
 import javax.management.ObjectName;
 import javax.management.StandardMBean;
 
+import com.google.common.annotations.VisibleForTesting;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
@@ -377,6 +378,12 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
     LOG.info("Added volume - " + dir + ", StorageType: " + storageType);
   }
 
+  @VisibleForTesting
+  public FsVolumeImpl createFsVolume(String storageUuid, File currentDir,
+      StorageType storageType) throws IOException {
+    return new FsVolumeImpl(this, storageUuid, currentDir, conf, storageType);
+  }
+
   @Override
   public void addVolume(final StorageLocation location,
       final List<NamespaceInfo> nsInfos)
@@ -396,8 +403,8 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
     final Storage.StorageDirectory sd = builder.getStorageDirectory();
 
     StorageType storageType = location.getStorageType();
-    final FsVolumeImpl fsVolume = new FsVolumeImpl(
+    final FsVolumeImpl fsVolume =
-        this, sd.getStorageUuid(), sd.getCurrentDir(), this.conf, storageType);
+        createFsVolume(sd.getStorageUuid(), sd.getCurrentDir(), storageType);
     final ReplicaMap tempVolumeMap = new ReplicaMap(fsVolume);
     ArrayList<IOException> exceptions = Lists.newArrayList();
 
@@ -413,6 +420,11 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
       }
     }
     if (!exceptions.isEmpty()) {
+      try {
+        sd.unlock();
+      } catch (IOException e) {
+        exceptions.add(e);
+      }
       throw MultipleIOException.createIOException(exceptions);
     }
 

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

@@ -37,18 +37,14 @@ import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
 import org.apache.hadoop.hdfs.server.common.Storage;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
+import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetTestUtil;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
-import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.test.GenericTestUtils;
 import org.junit.After;
 import org.junit.Test;
 
 import java.io.File;
 import java.io.IOException;
-import java.io.RandomAccessFile;
-import java.nio.channels.FileChannel;
-import java.nio.channels.FileLock;
-import java.nio.channels.OverlappingFileLockException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -70,7 +66,6 @@ import static org.hamcrest.CoreMatchers.not;
 import static org.hamcrest.core.Is.is;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
@@ -538,31 +533,10 @@ public class TestDataNodeHotSwapVolumes {
   private static void assertFileLocksReleased(Collection<String> dirs)
       throws IOException {
     for (String dir: dirs) {
-      StorageLocation sl = StorageLocation.parse(dir);
-      File lockFile = new File(sl.getFile(), Storage.STORAGE_FILE_LOCK);
-      RandomAccessFile raf = null;
-      FileChannel channel = null;
-      FileLock lock = null;
       try {
-        raf = new RandomAccessFile(lockFile, "rws");
+        FsDatasetTestUtil.assertFileLockReleased(dir);
-        channel = raf.getChannel();
+      } catch (IOException e) {
-        lock = channel.tryLock();
+        LOG.warn(e);
-        assertNotNull(String.format(
-          "Lock file at %s appears to be held by a different process.",
-          lockFile.getAbsolutePath()), lock);
-      } catch (OverlappingFileLockException e) {
-        fail(String.format("Must release lock file at %s.",
-          lockFile.getAbsolutePath()));
-      } finally {
-        if (lock != null) {
-          try {
-            lock.release();
-          } catch (IOException e) {
-            LOG.warn(String.format("I/O error releasing file lock %s.",
-              lockFile.getAbsolutePath()), e);
-          }
-        }
-        IOUtils.cleanup(null, channel, raf);
       }
     }
   }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetTestUtil.java

@@ -19,13 +19,24 @@ package org.apache.hadoop.hdfs.server.datanode.fsdataset.impl;
 
 import java.io.File;
 import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.nio.channels.FileChannel;
+import java.nio.channels.FileLock;
+import java.nio.channels.OverlappingFileLockException;
 import java.util.Collection;
+import java.util.Random;
 
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
+import org.apache.hadoop.hdfs.server.common.Storage;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.hdfs.server.datanode.ReplicaInfo;
+import org.apache.hadoop.hdfs.server.datanode.StorageLocation;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
+import org.apache.hadoop.io.IOUtils;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.fail;
 
 public class FsDatasetTestUtil {
 
@@ -72,4 +83,36 @@ public class FsDatasetTestUtil {
     FsDatasetImpl fsDataset = ((FsDatasetImpl) dn.getFSDataset());
     ((FsDatasetImpl.LazyWriter) fsDataset.lazyWriter.getRunnable()).stop();
   }
+
+  /**
+   * Asserts that the storage lock file in the given directory has been
+   * released.  This method works by trying to acquire the lock file itself.  If
+   * locking fails here, then the main code must have failed to release it.
+   *
+   * @param dir the storage directory to check
+   * @throws IOException if there is an unexpected I/O error
+   */
+  public static void assertFileLockReleased(String dir) throws IOException {
+    StorageLocation sl = StorageLocation.parse(dir);
+    File lockFile = new File(sl.getFile(), Storage.STORAGE_FILE_LOCK);
+    try (RandomAccessFile raf = new RandomAccessFile(lockFile, "rws");
+        FileChannel channel = raf.getChannel()) {
+      FileLock lock = channel.tryLock();
+      assertNotNull(String.format(
+          "Lock file at %s appears to be held by a different process.",
+          lockFile.getAbsolutePath()), lock);
+      if (lock != null) {
+        try {
+          lock.release();
+        } catch (IOException e) {
+          FsDatasetImpl.LOG.warn(String.format("I/O error releasing file lock %s.",
+              lockFile.getAbsolutePath()), e);
+          throw e;
+        }
+      }
+    } catch (OverlappingFileLockException e) {
+      fail(String.format("Must release lock file at %s.",
+          lockFile.getAbsolutePath()));
+    }
+  }
 }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestFsDatasetImpl.java

@@ -35,11 +35,13 @@ import org.apache.hadoop.hdfs.server.datanode.StorageLocation;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeReference;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.RoundRobinVolumeChoosingPolicy;
 import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
+import org.apache.hadoop.io.MultipleIOException;
 import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.hadoop.util.DiskChecker;
 import org.apache.hadoop.util.StringUtils;
 import org.junit.Before;
 import org.junit.Test;
+import org.mockito.Matchers;
 import org.mockito.invocation.InvocationOnMock;
 import org.mockito.stubbing.Answer;
 
@@ -57,12 +59,17 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyList;
 import static org.mockito.Matchers.anyListOf;
+import static org.mockito.Matchers.anyString;
 import static org.mockito.Matchers.eq;
 import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
@@ -291,4 +298,40 @@ public class TestFsDatasetImpl {
     assertFalse(volumeList.getVolumes().contains(brokenVolume));
     assertEquals(NUM_VOLUMES - 1, volumeList.getVolumes().size());
   }
+
+  @Test
+  public void testAddVolumeFailureReleasesInUseLock() throws IOException {
+    FsDatasetImpl spyDataset = spy(dataset);
+    FsVolumeImpl mockVolume = mock(FsVolumeImpl.class);
+    File badDir = new File(BASE_DIR, "bad");
+    badDir.mkdirs();
+    doReturn(mockVolume).when(spyDataset)
+        .createFsVolume(anyString(), any(File.class), any(StorageType.class));
+    doThrow(new IOException("Failed to getVolumeMap()"))
+      .when(mockVolume).getVolumeMap(
+        anyString(),
+        any(ReplicaMap.class),
+        any(RamDiskReplicaLruTracker.class));
+
+    Storage.StorageDirectory sd = createStorageDirectory(badDir);
+    sd.lock();
+    DataStorage.VolumeBuilder builder = new DataStorage.VolumeBuilder(storage, sd);
+    when(storage.prepareVolume(eq(datanode), eq(badDir),
+        Matchers.<List<NamespaceInfo>>any()))
+        .thenReturn(builder);
+
+    StorageLocation location = StorageLocation.parse(badDir.toString());
+    List<NamespaceInfo> nsInfos = Lists.newArrayList();
+    for (String bpid : BLOCK_POOL_IDS) {
+      nsInfos.add(new NamespaceInfo(0, CLUSTER_ID, bpid, 1));
+    }
+
+    try {
+      spyDataset.addVolume(location, nsInfos);
+      fail("Expect to throw MultipleIOException");
+    } catch (MultipleIOException e) {
+    }
+
+    FsDatasetTestUtil.assertFileLockReleased(badDir.toString());
+  }
 }