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From szets...@apache.org
Subject svn commit: r1148416 - /hadoop/common/trunk/mapreduce/src/contrib/raid/src/test/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockPlacementPolicyRaid.java
Date Tue, 19 Jul 2011 15:54:11 GMT
Author: szetszwo
Date: Tue Jul 19 15:54:10 2011
New Revision: 1148416

URL: http://svn.apache.org/viewvc?rev=1148416&view=rev
Log:
Revert r1148400 for MAPREDUCE-2711.

Modified:
    hadoop/common/trunk/mapreduce/src/contrib/raid/src/test/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockPlacementPolicyRaid.java

Modified: hadoop/common/trunk/mapreduce/src/contrib/raid/src/test/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockPlacementPolicyRaid.java
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/mapreduce/src/contrib/raid/src/test/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockPlacementPolicyRaid.java?rev=1148416&r1=1148415&r2=1148416&view=diff
==============================================================================
--- hadoop/common/trunk/mapreduce/src/contrib/raid/src/test/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockPlacementPolicyRaid.java
(original)
+++ hadoop/common/trunk/mapreduce/src/contrib/raid/src/test/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockPlacementPolicyRaid.java
Tue Jul 19 15:54:10 2011
@@ -1,514 +1,514 @@
-///**
-// * 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.blockmanagement;
-//
-//import java.io.IOException;
-//import java.util.Collection;
-//import java.util.HashMap;
-//import java.util.HashSet;
-//import java.util.List;
-//import java.util.Map;
-//import java.util.Set;
-//
-//import junit.framework.Assert;
-//
-//import org.apache.commons.logging.Log;
-//import org.apache.commons.logging.LogFactory;
-//import org.apache.hadoop.conf.Configuration;
-//import org.apache.hadoop.fs.BlockLocation;
-//import org.apache.hadoop.fs.FileStatus;
-//import org.apache.hadoop.fs.FileSystem;
-//import org.apache.hadoop.fs.Path;
-//import org.apache.hadoop.hdfs.DFSConfigKeys;
-//import org.apache.hadoop.hdfs.DFSTestUtil;
-//import org.apache.hadoop.hdfs.MiniDFSCluster;
-//import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
-//import org.apache.hadoop.hdfs.protocol.LocatedBlock;
-//import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyRaid.CachedFullPathNames;
-//import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyRaid.CachedLocatedBlocks;
-//import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyRaid.FileType;
-//import org.apache.hadoop.hdfs.server.namenode.*;
-//import org.apache.hadoop.raid.RaidNode;
-//import org.junit.Test;
-//
-//public class TestBlockPlacementPolicyRaid {
-//  private Configuration conf = null;
-//  private MiniDFSCluster cluster = null;
-//  private FSNamesystem namesystem = null;
-//  private BlockPlacementPolicyRaid policy = null;
-//  private FileSystem fs = null;
-//  String[] rack1 = {"/rack1"};
-//  String[] rack2 = {"/rack2"};
-//  String[] host1 = {"host1.rack1.com"};
-//  String[] host2 = {"host2.rack2.com"};
-//  String xorPrefix = null;
-//  String raidTempPrefix = null;
-//  String raidrsTempPrefix = null;
-//  String raidrsHarTempPrefix = null;
-//
-//  final static Log LOG =
-//      LogFactory.getLog(TestBlockPlacementPolicyRaid.class);
-//
-//  protected void setupCluster() throws IOException {
-//    conf = new Configuration();
-//    conf.setLong(DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_KEY, 1000L);
-//    conf.set("dfs.replication.pending.timeout.sec", "2");
-//    conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 1L);
-//    conf.set("dfs.block.replicator.classname",
-//             "org.apache.hadoop.hdfs.server.namenode.BlockPlacementPolicyRaid");
-//    conf.set(RaidNode.STRIPE_LENGTH_KEY, "2");
-//    conf.set(RaidNode.RS_PARITY_LENGTH_KEY, "3");
-//    conf.setInt(DFSConfigKeys.DFS_BYTES_PER_CHECKSUM_KEY, 1);
-//    // start the cluster with one datanode first
-//    cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1).
-//        format(true).racks(rack1).hosts(host1).build();
-//    cluster.waitActive();
-//    namesystem = cluster.getNameNode().getNamesystem();
-//    Assert.assertTrue("BlockPlacementPolicy type is not correct.",
-//      namesystem.blockManager.replicator instanceof BlockPlacementPolicyRaid);
-//    policy = (BlockPlacementPolicyRaid) namesystem.blockManager.replicator;
-//    fs = cluster.getFileSystem();
-//    xorPrefix = RaidNode.xorDestinationPath(conf).toUri().getPath();
-//    raidTempPrefix = RaidNode.xorTempPrefix(conf);
-//    raidrsTempPrefix = RaidNode.rsTempPrefix(conf);
-//    raidrsHarTempPrefix = RaidNode.rsHarTempPrefix(conf);
-//  }
-//
-//  /**
-//   * Test that the parity files will be placed at the good locations when we
-//   * create them.
-//   */
-//  @Test
-//  public void testChooseTargetForRaidFile() throws IOException {
-//    setupCluster();
-//    try {
-//      String src = "/dir/file";
-//      String parity = raidrsTempPrefix + src;
-//      DFSTestUtil.createFile(fs, new Path(src), 4, (short)1, 0L);
-//      DFSTestUtil.waitReplication(fs, new Path(src), (short)1);
-//      refreshPolicy();
-//      setBlockPlacementPolicy(namesystem, policy);
-//      // start 3 more datanodes
-//      String[] racks = {"/rack2", "/rack2", "/rack2",
-//                        "/rack2", "/rack2", "/rack2"};
-//      String[] hosts =
-//        {"host2.rack2.com", "host3.rack2.com", "host4.rack2.com",
-//         "host5.rack2.com", "host6.rack2.com", "host7.rack2.com"};
-//      cluster.startDataNodes(conf, 6, true, null, racks, hosts, null);
-//      int numBlocks = 6;
-//      DFSTestUtil.createFile(fs, new Path(parity), numBlocks, (short)2, 0L);
-//      DFSTestUtil.waitReplication(fs, new Path(parity), (short)2);
-//      FileStatus srcStat = fs.getFileStatus(new Path(src));
-//      BlockLocation[] srcLoc =
-//        fs.getFileBlockLocations(srcStat, 0, srcStat.getLen());
-//      FileStatus parityStat = fs.getFileStatus(new Path(parity));
-//      BlockLocation[] parityLoc =
-//          fs.getFileBlockLocations(parityStat, 0, parityStat.getLen());
-//      int parityLen = RaidNode.rsParityLength(conf);
-//      for (int i = 0; i < numBlocks / parityLen; i++) {
-//        Set<String> locations = new HashSet<String>();
-//        for (int j = 0; j < srcLoc.length; j++) {
-//          String [] names = srcLoc[j].getNames();
-//          for (int k = 0; k < names.length; k++) {
-//            LOG.info("Source block location: " + names[k]);
-//            locations.add(names[k]);
-//          }
-//        }
-//        for (int j = 0 ; j < parityLen; j++) {
-//          String[] names = parityLoc[j + i * parityLen].getNames();
-//          for (int k = 0; k < names.length; k++) {
-//            LOG.info("Parity block location: " + names[k]);
-//            Assert.assertTrue(locations.add(names[k]));
-//          }
-//        }
-//      }
-//    } finally {
-//      if (cluster != null) {
-//        cluster.shutdown();
-//      }
-//    }
-//  }
-//
-//  /**
-//   * Test that the har parity files will be placed at the good locations when we
-//   * create them.
-//   */
-//  @Test
-//  public void testChooseTargetForHarRaidFile() throws IOException {
-//    setupCluster();
-//    try {
-//      String[] racks = {"/rack2", "/rack2", "/rack2",
-//                        "/rack2", "/rack2", "/rack2"};
-//      String[] hosts =
-//        {"host2.rack2.com", "host3.rack2.com", "host4.rack2.com",
-//         "host5.rack2.com", "host6.rack2.com", "host7.rack2.com"};
-//      cluster.startDataNodes(conf, 6, true, null, racks, hosts, null);
-//      String harParity = raidrsHarTempPrefix + "/dir/file";
-//      int numBlocks = 11;
-//      DFSTestUtil.createFile(fs, new Path(harParity), numBlocks, (short)1, 0L);
-//      DFSTestUtil.waitReplication(fs, new Path(harParity), (short)1);
-//      FileStatus stat = fs.getFileStatus(new Path(harParity));
-//      BlockLocation[] loc = fs.getFileBlockLocations(stat, 0, stat.getLen());
-//      int rsParityLength = RaidNode.rsParityLength(conf);
-//      for (int i = 0; i < numBlocks - rsParityLength; i++) {
-//        Set<String> locations = new HashSet<String>();
-//        for (int j = 0; j < rsParityLength; j++) {
-//          for (int k = 0; k < loc[i + j].getNames().length; k++) {
-//            // verify that every adjacent 4 blocks are on differnt nodes
-//            String name = loc[i + j].getNames()[k];
-//            LOG.info("Har Raid block location: " + name);
-//            Assert.assertTrue(locations.add(name));
-//          }
-//        }
-//      }
-//    } finally {
-//      if (cluster != null) {
-//        cluster.shutdown();
-//      }
-//    }
-//  }
-//
-//  /**
-//   * Test BlockPlacementPolicyRaid.CachedLocatedBlocks
-//   * Verify that the results obtained from cache is the same as
-//   * the results obtained directly
-//   */
-//  @Test
-//  public void testCachedBlocks() throws IOException {
-//    setupCluster();
-//    try {
-//      String file1 = "/dir/file1";
-//      String file2 = "/dir/file2";
-//      DFSTestUtil.createFile(fs, new Path(file1), 3, (short)1, 0L);
-//      DFSTestUtil.createFile(fs, new Path(file2), 4, (short)1, 0L);
-//      // test blocks cache
-//      CachedLocatedBlocks cachedBlocks = new CachedLocatedBlocks(namesystem);
-//      verifyCachedBlocksResult(cachedBlocks, namesystem, file1);
-//      verifyCachedBlocksResult(cachedBlocks, namesystem, file1);
-//      verifyCachedBlocksResult(cachedBlocks, namesystem, file2);
-//      verifyCachedBlocksResult(cachedBlocks, namesystem, file2);
-//      try {
-//        Thread.sleep(1200L);
-//      } catch (InterruptedException e) {
-//      }
-//      verifyCachedBlocksResult(cachedBlocks, namesystem, file2);
-//      verifyCachedBlocksResult(cachedBlocks, namesystem, file1);
-//    } finally {
-//      if (cluster != null) {
-//        cluster.shutdown();
-//      }
-//    }
-//  }
-//
-//  /**
-//   * Test BlockPlacementPolicyRaid.CachedFullPathNames
-//   * Verify that the results obtained from cache is the same as
-//   * the results obtained directly
-//   */
-//  @Test
-//  public void testCachedPathNames() throws IOException {
-//    setupCluster();
-//    try {
-//      String file1 = "/dir/file1";
-//      String file2 = "/dir/file2";
-//      DFSTestUtil.createFile(fs, new Path(file1), 3, (short)1, 0L);
-//      DFSTestUtil.createFile(fs, new Path(file2), 4, (short)1, 0L);
-//      // test full path cache
-//      CachedFullPathNames cachedFullPathNames =
-//          new CachedFullPathNames(namesystem);
-//      FSInodeInfo inode1 = null;
-//      FSInodeInfo inode2 = null;
-//      NameNodeRaidTestUtil.readLock(namesystem.dir);
-//      try {
-//        inode1 = NameNodeRaidTestUtil.getNode(namesystem.dir, file1, true);
-//        inode2 = NameNodeRaidTestUtil.getNode(namesystem.dir, file2, true);
-//      } finally {
-//        NameNodeRaidTestUtil.readUnLock(namesystem.dir);
-//      }
-//      verifyCachedFullPathNameResult(cachedFullPathNames, inode1);
-//      verifyCachedFullPathNameResult(cachedFullPathNames, inode1);
-//      verifyCachedFullPathNameResult(cachedFullPathNames, inode2);
-//      verifyCachedFullPathNameResult(cachedFullPathNames, inode2);
-//      try {
-//        Thread.sleep(1200L);
-//      } catch (InterruptedException e) {
-//      }
-//      verifyCachedFullPathNameResult(cachedFullPathNames, inode2);
-//      verifyCachedFullPathNameResult(cachedFullPathNames, inode1);
-//    } finally {
-//      if (cluster != null) {
-//        cluster.shutdown();
-//      }
-//    }
-//  }
-//  /**
-//   * Test the result of getCompanionBlocks() on the unraided files
-//   */
-//  @Test
-//  public void testGetCompanionBLocks() throws IOException {
-//    setupCluster();
-//    try {
-//      String file1 = "/dir/file1";
-//      String file2 = "/raid/dir/file2";
-//      String file3 = "/raidrs/dir/file3";
-//      // Set the policy to default policy to place the block in the default way
-//      setBlockPlacementPolicy(namesystem, new BlockPlacementPolicyDefault(
-//          conf, namesystem, namesystem.clusterMap));
-//      DFSTestUtil.createFile(fs, new Path(file1), 3, (short)1, 0L);
-//      DFSTestUtil.createFile(fs, new Path(file2), 4, (short)1, 0L);
-//      DFSTestUtil.createFile(fs, new Path(file3), 8, (short)1, 0L);
-//      Collection<LocatedBlock> companionBlocks;
-//
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, getBlocks(namesystem, file1).get(0).getBlock());
-//      Assert.assertTrue(companionBlocks == null || companionBlocks.size() == 0);
-//
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, getBlocks(namesystem, file1).get(2).getBlock());
-//      Assert.assertTrue(companionBlocks == null || companionBlocks.size() == 0);
-//
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, getBlocks(namesystem, file2).get(0).getBlock());
-//      Assert.assertEquals(1, companionBlocks.size());
-//
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, getBlocks(namesystem, file2).get(3).getBlock());
-//      Assert.assertEquals(1, companionBlocks.size());
-//
-//      int rsParityLength = RaidNode.rsParityLength(conf);
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, getBlocks(namesystem, file3).get(0).getBlock());
-//      Assert.assertEquals(rsParityLength, companionBlocks.size());
-//
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, getBlocks(namesystem, file3).get(4).getBlock());
-//      Assert.assertEquals(rsParityLength, companionBlocks.size());
-//
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, getBlocks(namesystem, file3).get(6).getBlock());
-//      Assert.assertEquals(2, companionBlocks.size());
-//    } finally {
-//      if (cluster != null) {
-//        cluster.shutdown();
-//      }
-//    }
-//  }
-//
-//  static void setBlockPlacementPolicy(
-//      FSNamesystem namesystem, BlockPlacementPolicy policy) {
-//    namesystem.writeLock();
-//    try {
-//      namesystem.blockManager.replicator = policy;
-//    } finally {
-//      namesystem.writeUnlock();
-//    }
-//  }
-//
-//  /**
-//   * Test BlockPlacementPolicyRaid actually deletes the correct replica.
-//   * Start 2 datanodes and create 1 source file and its parity file.
-//   * 1) Start host1, create the parity file with replication 1
-//   * 2) Start host2, create the source file with replication 2
-//   * 3) Set repliation of source file to 1
-//   * Verify that the policy should delete the block with more companion blocks.
-//   */
-//  @Test
-//  public void testDeleteReplica() throws IOException {
-//    setupCluster();
-//    try {
-//      // Set the policy to default policy to place the block in the default way
-//      setBlockPlacementPolicy(namesystem, new BlockPlacementPolicyDefault(
-//          conf, namesystem, namesystem.clusterMap));
-//      DatanodeDescriptor datanode1 =
-//        NameNodeRaidTestUtil.getDatanodeMap(namesystem).values().iterator().next();
-//      String source = "/dir/file";
-//      String parity = xorPrefix + source;
-//
-//      final Path parityPath = new Path(parity);
-//      DFSTestUtil.createFile(fs, parityPath, 3, (short)1, 0L);
-//      DFSTestUtil.waitReplication(fs, parityPath, (short)1);
-//
-//      // start one more datanode
-//      cluster.startDataNodes(conf, 1, true, null, rack2, host2, null);
-//      DatanodeDescriptor datanode2 = null;
-//      for (DatanodeDescriptor d : NameNodeRaidTestUtil.getDatanodeMap(namesystem).values())
{
-//        if (!d.getName().equals(datanode1.getName())) {
-//          datanode2 = d;
-//        }
-//      }
-//      Assert.assertTrue(datanode2 != null);
-//      cluster.waitActive();
-//      final Path sourcePath = new Path(source);
-//      DFSTestUtil.createFile(fs, sourcePath, 5, (short)2, 0L);
-//      DFSTestUtil.waitReplication(fs, sourcePath, (short)2);
-//
-//      refreshPolicy();
-//      Assert.assertEquals(parity,
-//                          policy.getParityFile(source));
-//      Assert.assertEquals(source,
-//                          policy.getSourceFile(parity, xorPrefix));
-//
-//      List<LocatedBlock> sourceBlocks = getBlocks(namesystem, source);
-//      List<LocatedBlock> parityBlocks = getBlocks(namesystem, parity);
-//      Assert.assertEquals(5, sourceBlocks.size());
-//      Assert.assertEquals(3, parityBlocks.size());
-//
-//      // verify the result of getCompanionBlocks()
-//      Collection<LocatedBlock> companionBlocks;
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, sourceBlocks.get(0).getBlock());
-//      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
-//                            new int[]{0, 1}, new int[]{0});
-//
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, sourceBlocks.get(1).getBlock());
-//      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
-//                            new int[]{0, 1}, new int[]{0});
-//
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, sourceBlocks.get(2).getBlock());
-//      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
-//                            new int[]{2, 3}, new int[]{1});
-//
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, sourceBlocks.get(3).getBlock());
-//      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
-//                            new int[]{2, 3}, new int[]{1});
-//
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, sourceBlocks.get(4).getBlock());
-//      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
-//                            new int[]{4}, new int[]{2});
-//
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, parityBlocks.get(0).getBlock());
-//      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
-//                            new int[]{0, 1}, new int[]{0});
-//
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, parityBlocks.get(1).getBlock());
-//      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
-//                            new int[]{2, 3}, new int[]{1});
-//
-//      companionBlocks = getCompanionBlocks(
-//          namesystem, policy, parityBlocks.get(2).getBlock());
-//      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
-//                            new int[]{4}, new int[]{2});
-//
-//      // Set the policy back to raid policy. We have to create a new object
-//      // here to clear the block location cache
-//      refreshPolicy();
-//      setBlockPlacementPolicy(namesystem, policy);
-//      // verify policy deletes the correct blocks. companion blocks should be
-//      // evenly distributed.
-//      fs.setReplication(sourcePath, (short)1);
-//      DFSTestUtil.waitReplication(fs, sourcePath, (short)1);
-//      Map<String, Integer> counters = new HashMap<String, Integer>();
-//      refreshPolicy();
-//      for (int i = 0; i < parityBlocks.size(); i++) {
-//        companionBlocks = getCompanionBlocks(
-//            namesystem, policy, parityBlocks.get(i).getBlock());
-//
-//        counters = BlockPlacementPolicyRaid.countCompanionBlocks(
-//            companionBlocks, false);
-//        Assert.assertTrue(counters.get(datanode1.getName()) >= 1 &&
-//                          counters.get(datanode1.getName()) <= 2);
-//        Assert.assertTrue(counters.get(datanode1.getName()) +
-//                          counters.get(datanode2.getName()) ==
-//                          companionBlocks.size());
-//
-//        counters = BlockPlacementPolicyRaid.countCompanionBlocks(
-//            companionBlocks, true);
-//        Assert.assertTrue(counters.get(datanode1.getParent().getName()) >= 1 &&
-//                          counters.get(datanode1.getParent().getName()) <= 2);
-//        Assert.assertTrue(counters.get(datanode1.getParent().getName()) +
-//                          counters.get(datanode2.getParent().getName()) ==
-//                          companionBlocks.size());
-//      }
-//    } finally {
-//      if (cluster != null) {
-//        cluster.shutdown();
-//      }
-//    }
-//  }
-//
-//  // create a new BlockPlacementPolicyRaid to clear the cache
-//  private void refreshPolicy() {
-//      policy = new BlockPlacementPolicyRaid();
-//      policy.initialize(conf, namesystem, namesystem.clusterMap);
-//  }
-//
-//  private void verifyCompanionBlocks(Collection<LocatedBlock> companionBlocks,
-//      List<LocatedBlock> sourceBlocks, List<LocatedBlock> parityBlocks,
-//      int[] sourceBlockIndexes, int[] parityBlockIndexes) {
-//    Set<ExtendedBlock> blockSet = new HashSet<ExtendedBlock>();
-//    for (LocatedBlock b : companionBlocks) {
-//      blockSet.add(b.getBlock());
-//    }
-//    Assert.assertEquals(sourceBlockIndexes.length + parityBlockIndexes.length,
-//                        blockSet.size());
-//    for (int index : sourceBlockIndexes) {
-//      Assert.assertTrue(blockSet.contains(sourceBlocks.get(index).getBlock()));
-//    }
-//    for (int index : parityBlockIndexes) {
-//      Assert.assertTrue(blockSet.contains(parityBlocks.get(index).getBlock()));
-//    }
-//  }
-//
-//  private void verifyCachedFullPathNameResult(
-//      CachedFullPathNames cachedFullPathNames, FSInodeInfo inode)
-//  throws IOException {
-//    String res1 = inode.getFullPathName();
-//    String res2 = cachedFullPathNames.get(inode);
-//    LOG.info("Actual path name: " + res1);
-//    LOG.info("Cached path name: " + res2);
-//    Assert.assertEquals(cachedFullPathNames.get(inode),
-//                        inode.getFullPathName());
-//  }
-//
-//  private void verifyCachedBlocksResult(CachedLocatedBlocks cachedBlocks,
-//      FSNamesystem namesystem, String file) throws IOException{
-//    long len = NameNodeRaidUtil.getFileInfo(namesystem, file, true).getLen();
-//    List<LocatedBlock> res1 = NameNodeRaidUtil.getBlockLocations(namesystem,
-//        file, 0L, len, false, false).getLocatedBlocks();
-//    List<LocatedBlock> res2 = cachedBlocks.get(file);
-//    for (int i = 0; i < res1.size(); i++) {
-//      LOG.info("Actual block: " + res1.get(i).getBlock());
-//      LOG.info("Cached block: " + res2.get(i).getBlock());
-//      Assert.assertEquals(res1.get(i).getBlock(), res2.get(i).getBlock());
-//    }
-//  }
-//
-//  private Collection<LocatedBlock> getCompanionBlocks(
-//      FSNamesystem namesystem, BlockPlacementPolicyRaid policy,
-//      ExtendedBlock block) throws IOException {
-//    INodeFile inode = namesystem.blockManager.blocksMap.getINode(block
-//        .getLocalBlock());
-//    FileType type = policy.getFileType(inode.getFullPathName());
-//    return policy.getCompanionBlocks(inode.getFullPathName(), type,
-//        block.getLocalBlock());
-//  }
-//
-//  private List<LocatedBlock> getBlocks(FSNamesystem namesystem, String file) 
-//      throws IOException {
-//    long len = NameNodeRaidUtil.getFileInfo(namesystem, file, true).getLen();
-//    return NameNodeRaidUtil.getBlockLocations(namesystem,
-//               file, 0, len, false, false).getLocatedBlocks();
-//  }
-//}
+/**
+ * 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.blockmanagement;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import junit.framework.Assert;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.BlockLocation;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
+import org.apache.hadoop.hdfs.protocol.LocatedBlock;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyRaid.CachedFullPathNames;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyRaid.CachedLocatedBlocks;
+import org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyRaid.FileType;
+import org.apache.hadoop.hdfs.server.namenode.*;
+import org.apache.hadoop.raid.RaidNode;
+import org.junit.Test;
+
+public class TestBlockPlacementPolicyRaid {
+  private Configuration conf = null;
+  private MiniDFSCluster cluster = null;
+  private FSNamesystem namesystem = null;
+  private BlockPlacementPolicyRaid policy = null;
+  private FileSystem fs = null;
+  String[] rack1 = {"/rack1"};
+  String[] rack2 = {"/rack2"};
+  String[] host1 = {"host1.rack1.com"};
+  String[] host2 = {"host2.rack2.com"};
+  String xorPrefix = null;
+  String raidTempPrefix = null;
+  String raidrsTempPrefix = null;
+  String raidrsHarTempPrefix = null;
+
+  final static Log LOG =
+      LogFactory.getLog(TestBlockPlacementPolicyRaid.class);
+
+  protected void setupCluster() throws IOException {
+    conf = new Configuration();
+    conf.setLong(DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_KEY, 1000L);
+    conf.set("dfs.replication.pending.timeout.sec", "2");
+    conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, 1L);
+    conf.set("dfs.block.replicator.classname",
+             "org.apache.hadoop.hdfs.server.namenode.BlockPlacementPolicyRaid");
+    conf.set(RaidNode.STRIPE_LENGTH_KEY, "2");
+    conf.set(RaidNode.RS_PARITY_LENGTH_KEY, "3");
+    conf.setInt(DFSConfigKeys.DFS_BYTES_PER_CHECKSUM_KEY, 1);
+    // start the cluster with one datanode first
+    cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1).
+        format(true).racks(rack1).hosts(host1).build();
+    cluster.waitActive();
+    namesystem = cluster.getNameNode().getNamesystem();
+    Assert.assertTrue("BlockPlacementPolicy type is not correct.",
+      namesystem.blockManager.replicator instanceof BlockPlacementPolicyRaid);
+    policy = (BlockPlacementPolicyRaid) namesystem.blockManager.replicator;
+    fs = cluster.getFileSystem();
+    xorPrefix = RaidNode.xorDestinationPath(conf).toUri().getPath();
+    raidTempPrefix = RaidNode.xorTempPrefix(conf);
+    raidrsTempPrefix = RaidNode.rsTempPrefix(conf);
+    raidrsHarTempPrefix = RaidNode.rsHarTempPrefix(conf);
+  }
+
+  /**
+   * Test that the parity files will be placed at the good locations when we
+   * create them.
+   */
+  @Test
+  public void testChooseTargetForRaidFile() throws IOException {
+    setupCluster();
+    try {
+      String src = "/dir/file";
+      String parity = raidrsTempPrefix + src;
+      DFSTestUtil.createFile(fs, new Path(src), 4, (short)1, 0L);
+      DFSTestUtil.waitReplication(fs, new Path(src), (short)1);
+      refreshPolicy();
+      setBlockPlacementPolicy(namesystem, policy);
+      // start 3 more datanodes
+      String[] racks = {"/rack2", "/rack2", "/rack2",
+                        "/rack2", "/rack2", "/rack2"};
+      String[] hosts =
+        {"host2.rack2.com", "host3.rack2.com", "host4.rack2.com",
+         "host5.rack2.com", "host6.rack2.com", "host7.rack2.com"};
+      cluster.startDataNodes(conf, 6, true, null, racks, hosts, null);
+      int numBlocks = 6;
+      DFSTestUtil.createFile(fs, new Path(parity), numBlocks, (short)2, 0L);
+      DFSTestUtil.waitReplication(fs, new Path(parity), (short)2);
+      FileStatus srcStat = fs.getFileStatus(new Path(src));
+      BlockLocation[] srcLoc =
+        fs.getFileBlockLocations(srcStat, 0, srcStat.getLen());
+      FileStatus parityStat = fs.getFileStatus(new Path(parity));
+      BlockLocation[] parityLoc =
+          fs.getFileBlockLocations(parityStat, 0, parityStat.getLen());
+      int parityLen = RaidNode.rsParityLength(conf);
+      for (int i = 0; i < numBlocks / parityLen; i++) {
+        Set<String> locations = new HashSet<String>();
+        for (int j = 0; j < srcLoc.length; j++) {
+          String [] names = srcLoc[j].getNames();
+          for (int k = 0; k < names.length; k++) {
+            LOG.info("Source block location: " + names[k]);
+            locations.add(names[k]);
+          }
+        }
+        for (int j = 0 ; j < parityLen; j++) {
+          String[] names = parityLoc[j + i * parityLen].getNames();
+          for (int k = 0; k < names.length; k++) {
+            LOG.info("Parity block location: " + names[k]);
+            Assert.assertTrue(locations.add(names[k]));
+          }
+        }
+      }
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
+  /**
+   * Test that the har parity files will be placed at the good locations when we
+   * create them.
+   */
+  @Test
+  public void testChooseTargetForHarRaidFile() throws IOException {
+    setupCluster();
+    try {
+      String[] racks = {"/rack2", "/rack2", "/rack2",
+                        "/rack2", "/rack2", "/rack2"};
+      String[] hosts =
+        {"host2.rack2.com", "host3.rack2.com", "host4.rack2.com",
+         "host5.rack2.com", "host6.rack2.com", "host7.rack2.com"};
+      cluster.startDataNodes(conf, 6, true, null, racks, hosts, null);
+      String harParity = raidrsHarTempPrefix + "/dir/file";
+      int numBlocks = 11;
+      DFSTestUtil.createFile(fs, new Path(harParity), numBlocks, (short)1, 0L);
+      DFSTestUtil.waitReplication(fs, new Path(harParity), (short)1);
+      FileStatus stat = fs.getFileStatus(new Path(harParity));
+      BlockLocation[] loc = fs.getFileBlockLocations(stat, 0, stat.getLen());
+      int rsParityLength = RaidNode.rsParityLength(conf);
+      for (int i = 0; i < numBlocks - rsParityLength; i++) {
+        Set<String> locations = new HashSet<String>();
+        for (int j = 0; j < rsParityLength; j++) {
+          for (int k = 0; k < loc[i + j].getNames().length; k++) {
+            // verify that every adjacent 4 blocks are on differnt nodes
+            String name = loc[i + j].getNames()[k];
+            LOG.info("Har Raid block location: " + name);
+            Assert.assertTrue(locations.add(name));
+          }
+        }
+      }
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
+  /**
+   * Test BlockPlacementPolicyRaid.CachedLocatedBlocks
+   * Verify that the results obtained from cache is the same as
+   * the results obtained directly
+   */
+  @Test
+  public void testCachedBlocks() throws IOException {
+    setupCluster();
+    try {
+      String file1 = "/dir/file1";
+      String file2 = "/dir/file2";
+      DFSTestUtil.createFile(fs, new Path(file1), 3, (short)1, 0L);
+      DFSTestUtil.createFile(fs, new Path(file2), 4, (short)1, 0L);
+      // test blocks cache
+      CachedLocatedBlocks cachedBlocks = new CachedLocatedBlocks(namesystem);
+      verifyCachedBlocksResult(cachedBlocks, namesystem, file1);
+      verifyCachedBlocksResult(cachedBlocks, namesystem, file1);
+      verifyCachedBlocksResult(cachedBlocks, namesystem, file2);
+      verifyCachedBlocksResult(cachedBlocks, namesystem, file2);
+      try {
+        Thread.sleep(1200L);
+      } catch (InterruptedException e) {
+      }
+      verifyCachedBlocksResult(cachedBlocks, namesystem, file2);
+      verifyCachedBlocksResult(cachedBlocks, namesystem, file1);
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
+  /**
+   * Test BlockPlacementPolicyRaid.CachedFullPathNames
+   * Verify that the results obtained from cache is the same as
+   * the results obtained directly
+   */
+  @Test
+  public void testCachedPathNames() throws IOException {
+    setupCluster();
+    try {
+      String file1 = "/dir/file1";
+      String file2 = "/dir/file2";
+      DFSTestUtil.createFile(fs, new Path(file1), 3, (short)1, 0L);
+      DFSTestUtil.createFile(fs, new Path(file2), 4, (short)1, 0L);
+      // test full path cache
+      CachedFullPathNames cachedFullPathNames =
+          new CachedFullPathNames(namesystem);
+      FSInodeInfo inode1 = null;
+      FSInodeInfo inode2 = null;
+      NameNodeRaidTestUtil.readLock(namesystem.dir);
+      try {
+        inode1 = NameNodeRaidTestUtil.getNode(namesystem.dir, file1, true);
+        inode2 = NameNodeRaidTestUtil.getNode(namesystem.dir, file2, true);
+      } finally {
+        NameNodeRaidTestUtil.readUnLock(namesystem.dir);
+      }
+      verifyCachedFullPathNameResult(cachedFullPathNames, inode1);
+      verifyCachedFullPathNameResult(cachedFullPathNames, inode1);
+      verifyCachedFullPathNameResult(cachedFullPathNames, inode2);
+      verifyCachedFullPathNameResult(cachedFullPathNames, inode2);
+      try {
+        Thread.sleep(1200L);
+      } catch (InterruptedException e) {
+      }
+      verifyCachedFullPathNameResult(cachedFullPathNames, inode2);
+      verifyCachedFullPathNameResult(cachedFullPathNames, inode1);
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+  /**
+   * Test the result of getCompanionBlocks() on the unraided files
+   */
+  @Test
+  public void testGetCompanionBLocks() throws IOException {
+    setupCluster();
+    try {
+      String file1 = "/dir/file1";
+      String file2 = "/raid/dir/file2";
+      String file3 = "/raidrs/dir/file3";
+      // Set the policy to default policy to place the block in the default way
+      setBlockPlacementPolicy(namesystem, new BlockPlacementPolicyDefault(
+          conf, namesystem, namesystem.clusterMap));
+      DFSTestUtil.createFile(fs, new Path(file1), 3, (short)1, 0L);
+      DFSTestUtil.createFile(fs, new Path(file2), 4, (short)1, 0L);
+      DFSTestUtil.createFile(fs, new Path(file3), 8, (short)1, 0L);
+      Collection<LocatedBlock> companionBlocks;
+
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, getBlocks(namesystem, file1).get(0).getBlock());
+      Assert.assertTrue(companionBlocks == null || companionBlocks.size() == 0);
+
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, getBlocks(namesystem, file1).get(2).getBlock());
+      Assert.assertTrue(companionBlocks == null || companionBlocks.size() == 0);
+
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, getBlocks(namesystem, file2).get(0).getBlock());
+      Assert.assertEquals(1, companionBlocks.size());
+
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, getBlocks(namesystem, file2).get(3).getBlock());
+      Assert.assertEquals(1, companionBlocks.size());
+
+      int rsParityLength = RaidNode.rsParityLength(conf);
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, getBlocks(namesystem, file3).get(0).getBlock());
+      Assert.assertEquals(rsParityLength, companionBlocks.size());
+
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, getBlocks(namesystem, file3).get(4).getBlock());
+      Assert.assertEquals(rsParityLength, companionBlocks.size());
+
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, getBlocks(namesystem, file3).get(6).getBlock());
+      Assert.assertEquals(2, companionBlocks.size());
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
+  static void setBlockPlacementPolicy(
+      FSNamesystem namesystem, BlockPlacementPolicy policy) {
+    namesystem.writeLock();
+    try {
+      namesystem.blockManager.replicator = policy;
+    } finally {
+      namesystem.writeUnlock();
+    }
+  }
+
+  /**
+   * Test BlockPlacementPolicyRaid actually deletes the correct replica.
+   * Start 2 datanodes and create 1 source file and its parity file.
+   * 1) Start host1, create the parity file with replication 1
+   * 2) Start host2, create the source file with replication 2
+   * 3) Set repliation of source file to 1
+   * Verify that the policy should delete the block with more companion blocks.
+   */
+  @Test
+  public void testDeleteReplica() throws IOException {
+    setupCluster();
+    try {
+      // Set the policy to default policy to place the block in the default way
+      setBlockPlacementPolicy(namesystem, new BlockPlacementPolicyDefault(
+          conf, namesystem, namesystem.clusterMap));
+      DatanodeDescriptor datanode1 =
+        NameNodeRaidTestUtil.getDatanodeMap(namesystem).values().iterator().next();
+      String source = "/dir/file";
+      String parity = xorPrefix + source;
+
+      final Path parityPath = new Path(parity);
+      DFSTestUtil.createFile(fs, parityPath, 3, (short)1, 0L);
+      DFSTestUtil.waitReplication(fs, parityPath, (short)1);
+
+      // start one more datanode
+      cluster.startDataNodes(conf, 1, true, null, rack2, host2, null);
+      DatanodeDescriptor datanode2 = null;
+      for (DatanodeDescriptor d : NameNodeRaidTestUtil.getDatanodeMap(namesystem).values())
{
+        if (!d.getName().equals(datanode1.getName())) {
+          datanode2 = d;
+        }
+      }
+      Assert.assertTrue(datanode2 != null);
+      cluster.waitActive();
+      final Path sourcePath = new Path(source);
+      DFSTestUtil.createFile(fs, sourcePath, 5, (short)2, 0L);
+      DFSTestUtil.waitReplication(fs, sourcePath, (short)2);
+
+      refreshPolicy();
+      Assert.assertEquals(parity,
+                          policy.getParityFile(source));
+      Assert.assertEquals(source,
+                          policy.getSourceFile(parity, xorPrefix));
+
+      List<LocatedBlock> sourceBlocks = getBlocks(namesystem, source);
+      List<LocatedBlock> parityBlocks = getBlocks(namesystem, parity);
+      Assert.assertEquals(5, sourceBlocks.size());
+      Assert.assertEquals(3, parityBlocks.size());
+
+      // verify the result of getCompanionBlocks()
+      Collection<LocatedBlock> companionBlocks;
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, sourceBlocks.get(0).getBlock());
+      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
+                            new int[]{0, 1}, new int[]{0});
+
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, sourceBlocks.get(1).getBlock());
+      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
+                            new int[]{0, 1}, new int[]{0});
+
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, sourceBlocks.get(2).getBlock());
+      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
+                            new int[]{2, 3}, new int[]{1});
+
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, sourceBlocks.get(3).getBlock());
+      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
+                            new int[]{2, 3}, new int[]{1});
+
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, sourceBlocks.get(4).getBlock());
+      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
+                            new int[]{4}, new int[]{2});
+
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, parityBlocks.get(0).getBlock());
+      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
+                            new int[]{0, 1}, new int[]{0});
+
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, parityBlocks.get(1).getBlock());
+      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
+                            new int[]{2, 3}, new int[]{1});
+
+      companionBlocks = getCompanionBlocks(
+          namesystem, policy, parityBlocks.get(2).getBlock());
+      verifyCompanionBlocks(companionBlocks, sourceBlocks, parityBlocks,
+                            new int[]{4}, new int[]{2});
+
+      // Set the policy back to raid policy. We have to create a new object
+      // here to clear the block location cache
+      refreshPolicy();
+      setBlockPlacementPolicy(namesystem, policy);
+      // verify policy deletes the correct blocks. companion blocks should be
+      // evenly distributed.
+      fs.setReplication(sourcePath, (short)1);
+      DFSTestUtil.waitReplication(fs, sourcePath, (short)1);
+      Map<String, Integer> counters = new HashMap<String, Integer>();
+      refreshPolicy();
+      for (int i = 0; i < parityBlocks.size(); i++) {
+        companionBlocks = getCompanionBlocks(
+            namesystem, policy, parityBlocks.get(i).getBlock());
+
+        counters = BlockPlacementPolicyRaid.countCompanionBlocks(
+            companionBlocks, false);
+        Assert.assertTrue(counters.get(datanode1.getName()) >= 1 &&
+                          counters.get(datanode1.getName()) <= 2);
+        Assert.assertTrue(counters.get(datanode1.getName()) +
+                          counters.get(datanode2.getName()) ==
+                          companionBlocks.size());
+
+        counters = BlockPlacementPolicyRaid.countCompanionBlocks(
+            companionBlocks, true);
+        Assert.assertTrue(counters.get(datanode1.getParent().getName()) >= 1 &&
+                          counters.get(datanode1.getParent().getName()) <= 2);
+        Assert.assertTrue(counters.get(datanode1.getParent().getName()) +
+                          counters.get(datanode2.getParent().getName()) ==
+                          companionBlocks.size());
+      }
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
+  // create a new BlockPlacementPolicyRaid to clear the cache
+  private void refreshPolicy() {
+      policy = new BlockPlacementPolicyRaid();
+      policy.initialize(conf, namesystem, namesystem.clusterMap);
+  }
+
+  private void verifyCompanionBlocks(Collection<LocatedBlock> companionBlocks,
+      List<LocatedBlock> sourceBlocks, List<LocatedBlock> parityBlocks,
+      int[] sourceBlockIndexes, int[] parityBlockIndexes) {
+    Set<ExtendedBlock> blockSet = new HashSet<ExtendedBlock>();
+    for (LocatedBlock b : companionBlocks) {
+      blockSet.add(b.getBlock());
+    }
+    Assert.assertEquals(sourceBlockIndexes.length + parityBlockIndexes.length,
+                        blockSet.size());
+    for (int index : sourceBlockIndexes) {
+      Assert.assertTrue(blockSet.contains(sourceBlocks.get(index).getBlock()));
+    }
+    for (int index : parityBlockIndexes) {
+      Assert.assertTrue(blockSet.contains(parityBlocks.get(index).getBlock()));
+    }
+  }
+
+  private void verifyCachedFullPathNameResult(
+      CachedFullPathNames cachedFullPathNames, FSInodeInfo inode)
+  throws IOException {
+    String res1 = inode.getFullPathName();
+    String res2 = cachedFullPathNames.get(inode);
+    LOG.info("Actual path name: " + res1);
+    LOG.info("Cached path name: " + res2);
+    Assert.assertEquals(cachedFullPathNames.get(inode),
+                        inode.getFullPathName());
+  }
+
+  private void verifyCachedBlocksResult(CachedLocatedBlocks cachedBlocks,
+      FSNamesystem namesystem, String file) throws IOException{
+    long len = NameNodeRaidUtil.getFileInfo(namesystem, file, true).getLen();
+    List<LocatedBlock> res1 = NameNodeRaidUtil.getBlockLocations(namesystem,
+        file, 0L, len, false, false).getLocatedBlocks();
+    List<LocatedBlock> res2 = cachedBlocks.get(file);
+    for (int i = 0; i < res1.size(); i++) {
+      LOG.info("Actual block: " + res1.get(i).getBlock());
+      LOG.info("Cached block: " + res2.get(i).getBlock());
+      Assert.assertEquals(res1.get(i).getBlock(), res2.get(i).getBlock());
+    }
+  }
+
+  private Collection<LocatedBlock> getCompanionBlocks(
+      FSNamesystem namesystem, BlockPlacementPolicyRaid policy,
+      ExtendedBlock block) throws IOException {
+    INodeFile inode = namesystem.blockManager.blocksMap.getINode(block
+        .getLocalBlock());
+    FileType type = policy.getFileType(inode.getFullPathName());
+    return policy.getCompanionBlocks(inode.getFullPathName(), type,
+        block.getLocalBlock());
+  }
+
+  private List<LocatedBlock> getBlocks(FSNamesystem namesystem, String file) 
+      throws IOException {
+    long len = NameNodeRaidUtil.getFileInfo(namesystem, file, true).getLen();
+    return NameNodeRaidUtil.getBlockLocations(namesystem,
+               file, 0, len, false, false).getLocatedBlocks();
+  }
+}



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