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From ji...@apache.org
Subject hadoop git commit: HDFS-7957. Truncate should verify quota before making changes. Contributed by Jing Zhao.
Date Fri, 20 Mar 2015 18:58:01 GMT
Repository: hadoop
Updated Branches:
  refs/heads/branch-2.7 57a0382f4 -> 03fb9b4ce


HDFS-7957. Truncate should verify quota before making changes. Contributed by Jing Zhao.

(cherry picked from commit d368d3647a858644b9fcd3be33d9fea2a6962f69)
(cherry picked from commit 6be52e42a9eb2069cedb12a8311bc36131a3804f)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/03fb9b4c
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/03fb9b4c
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/03fb9b4c

Branch: refs/heads/branch-2.7
Commit: 03fb9b4ce05583fe3c16ecc5e9f09beba9b555c9
Parents: 57a0382
Author: Jing Zhao <jing9@apache.org>
Authored: Fri Mar 20 11:50:24 2015 -0700
Committer: Jing Zhao <jing9@apache.org>
Committed: Fri Mar 20 11:56:39 2015 -0700

----------------------------------------------------------------------
 hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt     |   2 +
 .../hdfs/server/namenode/FSDirectory.java       |  44 +++-
 .../hdfs/server/namenode/FSNamesystem.java      |  23 +-
 .../hadoop/hdfs/server/namenode/INodeFile.java  |  38 +++
 .../namenode/TestDiskspaceQuotaUpdate.java      |  43 +++-
 .../namenode/TestTruncateQuotaUpdate.java       | 248 +++++++++++++++++++
 6 files changed, 380 insertions(+), 18 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/03fb9b4c/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index 79785d9..bc6f999 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -899,6 +899,8 @@ Release 2.7.0 - UNRELEASED
 
     HDFS-7930. commitBlockSynchronization() does not remove locations. (yliu)
 
+    HDFS-7957. Truncate should verify quota before making changes. (jing9)
+
     BREAKDOWN OF HDFS-7584 SUBTASKS AND RELATED JIRAS
 
       HDFS-7720. Quota by Storage Type API, tools and ClientNameNode

http://git-wip-us.apache.org/repos/asf/hadoop/blob/03fb9b4c/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
index f6ab077..2f73627 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
@@ -61,6 +61,7 @@ import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeStorageInfo;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState;
 import org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo;
+import org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithSnapshotFeature;
 import org.apache.hadoop.hdfs.util.ByteArray;
 import org.apache.hadoop.hdfs.util.EnumCounters;
 import org.apache.hadoop.security.AccessControlException;
@@ -677,7 +678,7 @@ public class FSDirectory implements Closeable {
    * @param checkQuota if true then check if quota is exceeded
    * @throws QuotaExceededException if the new count violates any quota limit
    */
-   void updateCount(INodesInPath iip, int numOfINodes,
+  void updateCount(INodesInPath iip, int numOfINodes,
                     QuotaCounts counts, boolean checkQuota)
                     throws QuotaExceededException {
     assert hasWriteLock();
@@ -1050,7 +1051,7 @@ public class FSDirectory implements Closeable {
     INodeFile file = iip.getLastINode().asFile();
     BlocksMapUpdateInfo collectedBlocks = new BlocksMapUpdateInfo();
     boolean onBlockBoundary =
-        unprotectedTruncate(iip, newLength, collectedBlocks, mtime);
+        unprotectedTruncate(iip, newLength, collectedBlocks, mtime, null);
 
     if(! onBlockBoundary) {
       BlockInfoContiguous oldBlock = file.getLastBlock();
@@ -1073,11 +1074,11 @@ public class FSDirectory implements Closeable {
 
   boolean truncate(INodesInPath iip, long newLength,
                    BlocksMapUpdateInfo collectedBlocks,
-                   long mtime)
+                   long mtime, QuotaCounts delta)
       throws IOException {
     writeLock();
     try {
-      return unprotectedTruncate(iip, newLength, collectedBlocks, mtime);
+      return unprotectedTruncate(iip, newLength, collectedBlocks, mtime, delta);
     } finally {
       writeUnlock();
     }
@@ -1097,22 +1098,49 @@ public class FSDirectory implements Closeable {
    */
   boolean unprotectedTruncate(INodesInPath iip, long newLength,
                               BlocksMapUpdateInfo collectedBlocks,
-                              long mtime) throws IOException {
+                              long mtime, QuotaCounts delta) throws IOException {
     assert hasWriteLock();
     INodeFile file = iip.getLastINode().asFile();
     int latestSnapshot = iip.getLatestSnapshotId();
     file.recordModification(latestSnapshot, true);
-    long oldDiskspaceNoRep = file.storagespaceConsumedNoReplication();
+
+    verifyQuotaForTruncate(iip, file, newLength, delta);
+
     long remainingLength =
         file.collectBlocksBeyondMax(newLength, collectedBlocks);
     file.excludeSnapshotBlocks(latestSnapshot, collectedBlocks);
     file.setModificationTime(mtime);
-    updateCount(iip, 0, file.storagespaceConsumedNoReplication() - oldDiskspaceNoRep,
-      file.getBlockReplication(), true);
     // return whether on a block boundary
     return (remainingLength - newLength) == 0;
   }
 
+  private void verifyQuotaForTruncate(INodesInPath iip, INodeFile file,
+      long newLength, QuotaCounts delta) throws QuotaExceededException {
+    if (!getFSNamesystem().isImageLoaded() || shouldSkipQuotaChecks()) {
+      // Do not check quota if edit log is still being processed
+      return;
+    }
+    final long diff = file.computeQuotaDeltaForTruncate(newLength);
+    final short repl = file.getBlockReplication();
+    delta.addStorageSpace(diff * repl);
+    final BlockStoragePolicy policy = getBlockStoragePolicySuite()
+        .getPolicy(file.getStoragePolicyID());
+    List<StorageType> types = policy.chooseStorageTypes(repl);
+    for (StorageType t : types) {
+      if (t.supportTypeQuota()) {
+        delta.addTypeSpace(t, diff);
+      }
+    }
+    if (diff > 0) {
+      readLock();
+      try {
+        verifyQuota(iip, iip.length() - 1, delta, null);
+      } finally {
+        readUnlock();
+      }
+    }
+  }
+
   /**
    * This method is always called with writeLock of FSDirectory held.
    */

http://git-wip-us.apache.org/repos/asf/hadoop/blob/03fb9b4c/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
index ad17e8c..18d5826 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
@@ -2050,16 +2050,26 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
               ", truncate size: " + newLength + ".");
     }
     // Perform INodeFile truncation.
-    boolean onBlockBoundary = dir.truncate(iip, newLength,
-        toRemoveBlocks, mtime);
+    final QuotaCounts delta = new QuotaCounts.Builder().build();
+    boolean onBlockBoundary = dir.truncate(iip, newLength, toRemoveBlocks,
+        mtime, delta);
     Block truncateBlock = null;
-    if(! onBlockBoundary) {
+    if(!onBlockBoundary) {
       // Open file for write, but don't log into edits
       long lastBlockDelta = file.computeFileSize() - newLength;
       assert lastBlockDelta > 0 : "delta is 0 only if on block bounday";
       truncateBlock = prepareFileForTruncate(iip, clientName, clientMachine,
           lastBlockDelta, null);
     }
+
+    // update the quota: use the preferred block size for UC block
+    dir.writeLock();
+    try {
+      dir.updateCountNoQuotaCheck(iip, iip.length() - 1, delta);
+    } finally {
+      dir.writeUnlock();
+    }
+
     getEditLog().logTruncate(src, clientName, clientMachine, newLength, mtime,
         truncateBlock);
     return onBlockBoundary;
@@ -2128,13 +2138,10 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
           + truncatedBlockUC.getTruncateBlock().getNumBytes()
           + " block=" + truncatedBlockUC);
     }
-    if(shouldRecoverNow)
+    if (shouldRecoverNow) {
       truncatedBlockUC.initializeBlockRecovery(newBlock.getGenerationStamp());
+    }
 
-    // update the quota: use the preferred block size for UC block
-    final long diff =
-        file.getPreferredBlockSize() - truncatedBlockUC.getNumBytes();
-    dir.updateSpaceConsumed(iip, 0, diff, file.getBlockReplication());
     return newBlock;
   }
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/03fb9b4c/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeFile.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeFile.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeFile.java
index ca67333..62ae62d 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeFile.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeFile.java
@@ -24,6 +24,7 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
@@ -804,6 +805,43 @@ public class INodeFile extends INodeWithAdditionalFields
     return size;
   }
 
+  /**
+   * compute the quota usage change for a truncate op
+   * @param newLength the length for truncation
+   * @return the quota usage delta (not considering replication factor)
+   */
+  long computeQuotaDeltaForTruncate(final long newLength) {
+    final BlockInfoContiguous[] blocks = getBlocks();
+    if (blocks == null || blocks.length == 0) {
+      return 0;
+    }
+
+    int n = 0;
+    long size = 0;
+    for (; n < blocks.length && newLength > size; n++) {
+      size += blocks[n].getNumBytes();
+    }
+    final boolean onBoundary = size == newLength;
+
+    long truncateSize = 0;
+    for (int i = (onBoundary ? n : n - 1); i < blocks.length; i++) {
+      truncateSize += blocks[i].getNumBytes();
+    }
+
+    FileWithSnapshotFeature sf = getFileWithSnapshotFeature();
+    if (sf != null) {
+      FileDiff diff = sf.getDiffs().getLast();
+      BlockInfoContiguous[] sblocks = diff != null ? diff.getBlocks() : null;
+      if (sblocks != null) {
+        for (int i = (onBoundary ? n : n-1); i < blocks.length
+            && i < sblocks.length && blocks[i].equals(sblocks[i]); i++)
{
+          truncateSize -= blocks[i].getNumBytes();
+        }
+      }
+    }
+    return onBoundary ? -truncateSize : (getPreferredBlockSize() - truncateSize);
+  }
+
   void truncateBlocksTo(int n) {
     final BlockInfoContiguous[] newBlocks;
     if (n == 0) {

http://git-wip-us.apache.org/repos/asf/hadoop/blob/03fb9b4c/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDiskspaceQuotaUpdate.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDiskspaceQuotaUpdate.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDiskspaceQuotaUpdate.java
index 909b7c1..15ba15e 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDiskspaceQuotaUpdate.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestDiskspaceQuotaUpdate.java
@@ -216,8 +216,7 @@ public class TestDiskspaceQuotaUpdate {
     INodeFile inode = fsdir.getINode(file.toString()).asFile();
     Assert.assertNotNull(inode);
     Assert.assertFalse("should not be UC", inode.isUnderConstruction());
-    Assert.assertNull("should not have a lease", cluster.getNamesystem()
-        .getLeaseManager().getLeaseByPath(file.toString()));
+    Assert.assertNull("should not have a lease", cluster.getNamesystem().getLeaseManager().getLeaseByPath(file.toString()));
     // make sure the quota usage is unchanged
     final long newSpaceUsed = dirNode.getDirectoryWithQuotaFeature()
         .getSpaceConsumed().getStorageSpace();
@@ -269,4 +268,44 @@ public class TestDiskspaceQuotaUpdate {
     dfs.recoverLease(file);
     cluster.restartNameNodes();
   }
+
+  /**
+   * Test truncate over quota does not mark file as UC or create a lease
+   */
+  @Test (timeout=60000)
+  public void testTruncateOverQuota() throws Exception {
+    final Path dir = new Path("/TestTruncateOverquota");
+    final Path file = new Path(dir, "file");
+
+    // create partial block file
+    dfs.mkdirs(dir);
+    DFSTestUtil.createFile(dfs, file, BLOCKSIZE/2, REPLICATION, seed);
+
+    // lower quota to cause exception when appending to partial block
+    dfs.setQuota(dir, Long.MAX_VALUE - 1, 1);
+    final INodeDirectory dirNode = fsdir.getINode4Write(dir.toString())
+        .asDirectory();
+    final long spaceUsed = dirNode.getDirectoryWithQuotaFeature()
+        .getSpaceConsumed().getStorageSpace();
+    try {
+      dfs.truncate(file, BLOCKSIZE / 2 - 1);
+      Assert.fail("truncate didn't fail");
+    } catch (RemoteException e) {
+      assertTrue(e.getClassName().contains("DSQuotaExceededException"));
+    }
+
+    // check that the file exists, isn't UC, and has no dangling lease
+    INodeFile inode = fsdir.getINode(file.toString()).asFile();
+    Assert.assertNotNull(inode);
+    Assert.assertFalse("should not be UC", inode.isUnderConstruction());
+    Assert.assertNull("should not have a lease", cluster.getNamesystem()
+        .getLeaseManager().getLeaseByPath(file.toString()));
+    // make sure the quota usage is unchanged
+    final long newSpaceUsed = dirNode.getDirectoryWithQuotaFeature()
+        .getSpaceConsumed().getStorageSpace();
+    assertEquals(spaceUsed, newSpaceUsed);
+    // make sure edits aren't corrupted
+    dfs.recoverLease(file);
+    cluster.restartNameNodes();
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/03fb9b4c/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestTruncateQuotaUpdate.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestTruncateQuotaUpdate.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestTruncateQuotaUpdate.java
new file mode 100644
index 0000000..a4cb97f
--- /dev/null
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestTruncateQuotaUpdate.java
@@ -0,0 +1,248 @@
+/**
+ * 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 org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.StorageType;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.protocol.HdfsConstants;
+import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotTestHelper;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Make sure we correctly update the quota usage for truncate.
+ * We need to cover the following cases:
+ * 1. No snapshot, truncate to 0
+ * 2. No snapshot, truncate at block boundary
+ * 3. No snapshot, not on block boundary
+ * 4~6. With snapshot, all the current blocks are included in latest
+ *      snapshots, repeat 1~3
+ * 7~9. With snapshot, blocks in the latest snapshot and blocks in the current
+ *      file diverged, repeat 1~3
+ */
+public class TestTruncateQuotaUpdate {
+  private static final int BLOCKSIZE = 1024;
+  private static final short REPLICATION = 4;
+  private static final long DISKQUOTA = BLOCKSIZE * 20;
+  static final long seed = 0L;
+  private static final Path dir = new Path("/TestTruncateQuotaUpdate");
+  private static final Path file = new Path(dir, "file");
+
+  private MiniDFSCluster cluster;
+  private FSDirectory fsdir;
+  private DistributedFileSystem dfs;
+
+  @Before
+  public void setUp() throws Exception {
+    final Configuration conf = new Configuration();
+    conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, BLOCKSIZE);
+    cluster = new MiniDFSCluster.Builder(conf).numDataNodes(REPLICATION)
+        .build();
+    cluster.waitActive();
+
+    fsdir = cluster.getNamesystem().getFSDirectory();
+    dfs = cluster.getFileSystem();
+
+    dfs.mkdirs(dir);
+    dfs.setQuota(dir, Long.MAX_VALUE - 1, DISKQUOTA);
+    dfs.setQuotaByStorageType(dir, StorageType.DISK, DISKQUOTA);
+    dfs.setStoragePolicy(dir, HdfsConstants.HOT_STORAGE_POLICY_NAME);
+  }
+
+  @After
+  public void tearDown() throws Exception {
+    if (cluster != null) {
+      cluster.shutdown();
+    }
+  }
+
+  @Test
+  public void testTruncateQuotaUpdate() throws Exception {
+
+  }
+
+  public interface TruncateCase {
+    public void prepare() throws Exception;
+    public void run() throws Exception;
+  }
+
+  private void testTruncate(long newLength, long expectedDiff,
+      long expectedUsage) throws Exception {
+    // before doing the real truncation, make sure the computation is correct
+    final INodesInPath iip = fsdir.getINodesInPath4Write(file.toString());
+    final INodeFile fileNode = iip.getLastINode().asFile();
+    fileNode.recordModification(iip.getLatestSnapshotId(), true);
+    final long diff = fileNode.computeQuotaDeltaForTruncate(newLength);
+    Assert.assertEquals(expectedDiff, diff);
+
+    // do the real truncation
+    dfs.truncate(file, newLength);
+    // wait for truncate to finish
+    TestFileTruncate.checkBlockRecovery(file, dfs);
+    final INodeDirectory dirNode = fsdir.getINode4Write(dir.toString())
+        .asDirectory();
+    final long spaceUsed = dirNode.getDirectoryWithQuotaFeature()
+        .getSpaceConsumed().getStorageSpace();
+    final long diskUsed = dirNode.getDirectoryWithQuotaFeature()
+        .getSpaceConsumed().getTypeSpaces().get(StorageType.DISK);
+    Assert.assertEquals(expectedUsage, spaceUsed);
+    Assert.assertEquals(expectedUsage, diskUsed);
+  }
+
+  /**
+   * case 1~3
+   */
+  private class TruncateWithoutSnapshot implements TruncateCase {
+    @Override
+    public void prepare() throws Exception {
+      // original file size: 2.5 block
+      DFSTestUtil.createFile(dfs, file, BLOCKSIZE * 2 + BLOCKSIZE / 2,
+          REPLICATION, 0L);
+    }
+
+    @Override
+    public void run() throws Exception {
+      // case 1: first truncate to 1.5 blocks
+      long newLength = BLOCKSIZE + BLOCKSIZE / 2;
+      // we truncate 1 blocks, but not on the boundary, thus the diff should
+      // be -block + (block - 0.5 block) = -0.5 block
+      long diff = -BLOCKSIZE / 2;
+      // the new quota usage should be BLOCKSIZE * 1.5 * replication
+      long usage = (BLOCKSIZE + BLOCKSIZE / 2) * REPLICATION;
+      testTruncate(newLength, diff, usage);
+
+      // case 2: truncate to 1 block
+      newLength = BLOCKSIZE;
+      // the diff should be -0.5 block since this is not on boundary
+      diff = -BLOCKSIZE / 2;
+      // after truncation the quota usage should be BLOCKSIZE * replication
+      usage = BLOCKSIZE * REPLICATION;
+      testTruncate(newLength, diff, usage);
+
+      // case 3: truncate to 0
+      testTruncate(0, -BLOCKSIZE, 0);
+    }
+  }
+
+  /**
+   * case 4~6
+   */
+  private class TruncateWithSnapshot implements TruncateCase {
+    @Override
+    public void prepare() throws Exception {
+      DFSTestUtil.createFile(dfs, file, BLOCKSIZE * 2 + BLOCKSIZE / 2,
+          REPLICATION, 0L);
+      SnapshotTestHelper.createSnapshot(dfs, dir, "s1");
+    }
+
+    @Override
+    public void run() throws Exception {
+      // case 4: truncate to 1.5 blocks
+      long newLength = BLOCKSIZE + BLOCKSIZE / 2;
+      // all the blocks are in snapshot. truncate need to allocate a new block
+      // diff should be +BLOCKSIZE
+      long diff = BLOCKSIZE;
+      // the new quota usage should be BLOCKSIZE * 3 * replication
+      long usage = BLOCKSIZE * 3 * REPLICATION;
+      testTruncate(newLength, diff, usage);
+
+      // case 5: truncate to 1 block
+      newLength = BLOCKSIZE;
+      // the block for truncation is not in snapshot, diff should be -0.5 block
+      diff = -BLOCKSIZE / 2;
+      // after truncation the quota usage should be 2.5 block * repl
+      usage = (BLOCKSIZE * 2 + BLOCKSIZE / 2) * REPLICATION;
+      testTruncate(newLength, diff, usage);
+
+      // case 6: truncate to 0
+      testTruncate(0, 0, usage);
+    }
+  }
+
+  /**
+   * case 7~9
+   */
+  private class TruncateWithSnapshot2 implements TruncateCase {
+    @Override
+    public void prepare() throws Exception {
+      // original size: 2.5 blocks
+      DFSTestUtil.createFile(dfs, file, BLOCKSIZE * 2 + BLOCKSIZE / 2,
+          REPLICATION, 0L);
+      SnapshotTestHelper.createSnapshot(dfs, dir, "s1");
+
+      // truncate to 1.5 block
+      dfs.truncate(file, BLOCKSIZE + BLOCKSIZE / 2);
+      TestFileTruncate.checkBlockRecovery(file, dfs);
+
+      // append another 1 BLOCK
+      DFSTestUtil.appendFile(dfs, file, BLOCKSIZE);
+    }
+
+    @Override
+    public void run() throws Exception {
+      // case 8: truncate to 2 blocks
+      long newLength = BLOCKSIZE * 2;
+      // the original 2.5 blocks are in snapshot. the block truncated is not
+      // in snapshot. diff should be -0.5 block
+      long diff = -BLOCKSIZE / 2;
+      // the new quota usage should be BLOCKSIZE * 3.5 * replication
+      long usage = (BLOCKSIZE * 3 + BLOCKSIZE / 2) * REPLICATION;
+      testTruncate(newLength, diff, usage);
+
+      // case 7: truncate to 1.5 block
+      newLength = BLOCKSIZE  + BLOCKSIZE / 2;
+      // the block for truncation is not in snapshot, diff should be
+      // -0.5 block + (block - 0.5block) = 0
+      diff = 0;
+      // after truncation the quota usage should be 3 block * repl
+      usage = (BLOCKSIZE * 3) * REPLICATION;
+      testTruncate(newLength, diff, usage);
+
+      // case 9: truncate to 0
+      testTruncate(0, -BLOCKSIZE / 2,
+          (BLOCKSIZE * 2 + BLOCKSIZE / 2) * REPLICATION);
+    }
+  }
+
+  private void testTruncateQuotaUpdate(TruncateCase t) throws Exception {
+    t.prepare();
+    t.run();
+  }
+
+  @Test
+  public void testQuotaNoSnapshot() throws Exception {
+    testTruncateQuotaUpdate(new TruncateWithoutSnapshot());
+  }
+
+  @Test
+  public void testQuotaWithSnapshot() throws Exception {
+    testTruncateQuotaUpdate(new TruncateWithSnapshot());
+  }
+
+  @Test
+  public void testQuotaWithSnapshot2() throws Exception {
+    testTruncateQuotaUpdate(new TruncateWithSnapshot2());
+  }
+}


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