diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index 58c1dae417f..aeaad5bc67a 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -1291,6 +1291,8 @@ Release 0.22.0 - Unreleased
     MAPREDUCE-2169. Integrated Reed-Solomon code with RaidNode. (Ramkumar
     Vadali via schen)
 
+    MAPREDUCE-2936. Contrib Raid compilation broken after HDFS-1620. (vinodkv)
+
   IMPROVEMENTS
 
     MAPREDUCE-2141. Add an "extra data" field to Task for use by Mesos. (matei)
diff --git a/hadoop-mapreduce-project/src/contrib/raid/src/java/org/apache/hadoop/hdfs/server/datanode/RaidBlockSender.java b/hadoop-mapreduce-project/src/contrib/raid/src/java/org/apache/hadoop/hdfs/server/datanode/RaidBlockSender.java
index 337deaeedfa..8cde11d9cdf 100644
--- a/hadoop-mapreduce-project/src/contrib/raid/src/java/org/apache/hadoop/hdfs/server/datanode/RaidBlockSender.java
+++ b/hadoop-mapreduce-project/src/contrib/raid/src/java/org/apache/hadoop/hdfs/server/datanode/RaidBlockSender.java
@@ -31,7 +31,7 @@
 import org.apache.commons.logging.Log;
 import org.apache.hadoop.fs.ChecksumException;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
-import org.apache.hadoop.hdfs.protocol.FSConstants;
+import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.datatransfer.PacketHeader;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.net.SocketOutputStream;
@@ -389,7 +389,7 @@ public long sendBlock(DataOutputStream out, OutputStream baseStream)
         streamForSendChunks = baseStream;
         
         // assure a mininum buffer size.
-        maxChunksPerPacket = (Math.max(FSConstants.IO_FILE_BUFFER_SIZE, 
+        maxChunksPerPacket = (Math.max(HdfsConstants.IO_FILE_BUFFER_SIZE, 
                                        MIN_BUFFER_WITH_TRANSFERTO)
                               + bytesPerChecksum - 1)/bytesPerChecksum;
         
@@ -397,7 +397,7 @@ public long sendBlock(DataOutputStream out, OutputStream baseStream)
         pktSize += checksumSize * maxChunksPerPacket;
       } else {
         maxChunksPerPacket = Math.max(1,
-            (FSConstants.IO_FILE_BUFFER_SIZE + bytesPerChecksum - 1)/bytesPerChecksum);
+            (HdfsConstants.IO_FILE_BUFFER_SIZE + bytesPerChecksum - 1)/bytesPerChecksum);
         pktSize += (bytesPerChecksum + checksumSize) * maxChunksPerPacket;
       }
 
diff --git a/hadoop-mapreduce-project/src/contrib/raid/src/java/org/apache/hadoop/raid/BlockFixer.java b/hadoop-mapreduce-project/src/contrib/raid/src/java/org/apache/hadoop/raid/BlockFixer.java
index 56ca58ebbed..863784a9c7b 100644
--- a/hadoop-mapreduce-project/src/contrib/raid/src/java/org/apache/hadoop/raid/BlockFixer.java
+++ b/hadoop-mapreduce-project/src/contrib/raid/src/java/org/apache/hadoop/raid/BlockFixer.java
@@ -46,11 +46,11 @@
 import org.apache.hadoop.hdfs.protocol.datatransfer.*;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
-import org.apache.hadoop.hdfs.protocol.FSConstants;
-import org.apache.hadoop.hdfs.protocol.FSConstants.DatanodeReportType;
+import org.apache.hadoop.hdfs.protocol.HdfsConstants;
+import org.apache.hadoop.hdfs.protocol.HdfsConstants.DatanodeReportType;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
-import org.apache.hadoop.hdfs.server.common.HdfsConstants;
+import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
 import org.apache.hadoop.hdfs.server.datanode.FSDataset;
 import org.apache.hadoop.hdfs.server.datanode.RaidBlockSender;
 import org.apache.commons.logging.Log;
@@ -741,17 +741,17 @@ private void sendFixedBlock(DatanodeInfo datanode,
       
       int readTimeout =
         getConf().getInt(BLOCKFIX_READ_TIMEOUT,
-                         HdfsConstants.READ_TIMEOUT);
+                         HdfsServerConstants.READ_TIMEOUT);
       NetUtils.connect(sock, target, readTimeout);
       sock.setSoTimeout(readTimeout);
       
       int writeTimeout = getConf().getInt(BLOCKFIX_WRITE_TIMEOUT,
-                                          HdfsConstants.WRITE_TIMEOUT);
+                                          HdfsServerConstants.WRITE_TIMEOUT);
       
       OutputStream baseStream = NetUtils.getOutputStream(sock, writeTimeout);
       DataOutputStream out = 
         new DataOutputStream(new BufferedOutputStream(baseStream,
-                                                      FSConstants.
+                                                      HdfsConstants.
                                                       SMALL_BUFFER_SIZE));
       
       boolean corruptChecksumOk = false;