HDFS-8057 Move BlockReader implementation to the client implementation package. Contributed by Takanobu Asanuma

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java

@@ -56,6 +56,7 @@
 import org.apache.hadoop.fs.ReadOption;
 import org.apache.hadoop.fs.StorageType;
 import org.apache.hadoop.hdfs.DFSUtilClient.CorruptedBlocks;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderFactory;
 import org.apache.hadoop.hdfs.client.impl.DfsClientConf;
 import org.apache.hadoop.hdfs.protocol.ClientDatanodeProtocol;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/BlockReaderFactory.java

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import static org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ShortCircuitFdResponse.USE_RECEIPT_VERIFICATION;
 
@@ -34,7 +34,15 @@
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.StorageType;
-import org.apache.hadoop.hdfs.client.impl.DfsClientConf;
+import org.apache.hadoop.hdfs.BlockReader;
+import org.apache.hadoop.hdfs.ClientContext;
+import org.apache.hadoop.hdfs.DFSClient;
+import org.apache.hadoop.hdfs.DFSInputStream;
+import org.apache.hadoop.hdfs.DFSUtilClient;
+import org.apache.hadoop.hdfs.ExtendedBlockId;
+import org.apache.hadoop.hdfs.RemotePeerFactory;
+import org.apache.hadoop.hdfs.ReplicaAccessor;
+import org.apache.hadoop.hdfs.ReplicaAccessorBuilder;
 import org.apache.hadoop.hdfs.client.impl.DfsClientConf.ShortCircuitConf;
 import org.apache.hadoop.hdfs.net.DomainPeer;
 import org.apache.hadoop.hdfs.net.Peer;
@@ -646,7 +654,7 @@ private ShortCircuitReplicaInfo requestFileDescriptors(DomainPeer peer,
   }
 
   /**
-   * Get a RemoteBlockReader that communicates over a UNIX domain socket.
+   * Get a BlockReaderRemote that communicates over a UNIX domain socket.
    *
    * @return The new BlockReader, or null if we failed to create the block
    * reader.
@@ -709,7 +717,7 @@ private BlockReader getRemoteBlockReaderFromDomain() throws IOException {
   }
 
   /**
-   * Get a RemoteBlockReader that communicates over a TCP socket.
+   * Get a BlockReaderRemote that communicates over a TCP socket.
    *
    * @return The new BlockReader.  We will not return null, but instead throw
    *         an exception if this fails.
@@ -837,13 +845,13 @@ private static boolean isSecurityException(IOException ioe) {
   private BlockReader getRemoteBlockReader(Peer peer) throws IOException {
     int networkDistance = clientContext.getNetworkDistance(datanode);
     if (conf.getShortCircuitConf().isUseLegacyBlockReader()) {
-      return RemoteBlockReader.newBlockReader(fileName,
+      return BlockReaderRemote.newBlockReader(fileName,
           block, token, startOffset, length, conf.getIoBufferSize(),
           verifyChecksum, clientName, peer, datanode,
           clientContext.getPeerCache(), cachingStrategy, tracer,
           networkDistance);
     } else {
-      return RemoteBlockReader2.newBlockReader(
+      return BlockReaderRemote2.newBlockReader(
           fileName, block, token, startOffset, length,
           verifyChecksum, clientName, peer, datanode,
           clientContext.getPeerCache(), cachingStrategy, tracer,

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/BlockReaderLocal.java

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import java.io.IOException;
 import java.nio.ByteBuffer;
@@ -25,6 +25,7 @@
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.fs.ReadOption;
 import org.apache.hadoop.fs.StorageType;
+import org.apache.hadoop.hdfs.BlockReader;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.hdfs.client.impl.DfsClientConf.ShortCircuitConf;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/BlockReaderLocalLegacy.java

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import java.io.DataInputStream;
 import java.io.File;
@@ -33,8 +33,9 @@
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.ReadOption;
 import org.apache.hadoop.fs.StorageType;
+import org.apache.hadoop.hdfs.BlockReader;
+import org.apache.hadoop.hdfs.DFSUtilClient;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
-import org.apache.hadoop.hdfs.client.impl.DfsClientConf;
 import org.apache.hadoop.hdfs.client.impl.DfsClientConf.ShortCircuitConf;
 import org.apache.hadoop.hdfs.protocol.BlockLocalPathInfo;
 import org.apache.hadoop.hdfs.protocol.ClientDatanodeProtocol;

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/BlockReaderRemote.java

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
@@ -29,6 +29,8 @@
 import org.apache.hadoop.fs.FSInputChecker;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.ReadOption;
+import org.apache.hadoop.hdfs.BlockReader;
+import org.apache.hadoop.hdfs.PeerCache;
 import org.apache.hadoop.hdfs.net.Peer;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
@@ -54,13 +56,13 @@
 
 /**
  * @deprecated this is an old implementation that is being left around
- * in case any issues spring up with the new {@link RemoteBlockReader2}
+ * in case any issues spring up with the new {@link BlockReaderRemote2}
  * implementation.
  * It will be removed in the next release.
  */
 @InterfaceAudience.Private
 @Deprecated
-public class RemoteBlockReader extends FSInputChecker implements BlockReader {
+public class BlockReaderRemote extends FSInputChecker implements BlockReader {
   static final Logger LOG = LoggerFactory.getLogger(FSInputChecker.class);
 
   private final Peer peer;
@@ -209,7 +211,7 @@ protected synchronized int readChunk(long pos, byte[] buf, int offset,
       int len, byte[] checksumBuf)
       throws IOException {
     try (TraceScope ignored = tracer.newScope(
-        "RemoteBlockReader#readChunk(" + blockId + ")")) {
+        "BlockReaderRemote#readChunk(" + blockId + ")")) {
       return readChunkImpl(pos, buf, offset, len, checksumBuf);
     }
   }
@@ -335,7 +337,7 @@ private synchronized int readChunkImpl(long pos, byte[] buf, int offset,
     return bytesToRead;
   }
 
-  private RemoteBlockReader(String file, String bpid, long blockId,
+  private BlockReaderRemote(String file, String bpid, long blockId,
       DataInputStream in, DataChecksum checksum, boolean verifyChecksum,
       long startOffset, long firstChunkOffset, long bytesToRead, Peer peer,
       DatanodeID datanodeID, PeerCache peerCache, Tracer tracer,
@@ -386,7 +388,7 @@ private RemoteBlockReader(String file, String bpid, long blockId,
    * @param clientName  Client name
    * @return New BlockReader instance, or null on error.
    */
-  public static RemoteBlockReader newBlockReader(String file,
+  public static BlockReaderRemote newBlockReader(String file,
       ExtendedBlock block,
       Token<BlockTokenIdentifier> blockToken,
       long startOffset, long len,
@@ -412,7 +414,7 @@ public static RemoteBlockReader newBlockReader(String file,
 
     BlockOpResponseProto status = BlockOpResponseProto.parseFrom(
         PBHelperClient.vintPrefixed(in));
-    RemoteBlockReader2.checkSuccess(status, peer, block, file);
+    BlockReaderRemote2.checkSuccess(status, peer, block, file);
     ReadOpChecksumInfoProto checksumInfo =
         status.getReadOpChecksumInfo();
     DataChecksum checksum = DataTransferProtoUtil.fromProto(
@@ -429,7 +431,7 @@ public static RemoteBlockReader newBlockReader(String file,
           startOffset + " for file " + file);
     }
 
-    return new RemoteBlockReader(file, block.getBlockPoolId(), block.getBlockId(),
+    return new BlockReaderRemote(file, block.getBlockPoolId(), block.getBlockId(),
         in, checksum, verifyChecksum, startOffset, firstChunkOffset, len,
         peer, datanodeID, peerCache, tracer, networkDistance);
   }
@@ -467,7 +469,7 @@ public int readAll(byte[] buf, int offset, int len) throws IOException {
   void sendReadResult(Peer peer, Status statusCode) {
     assert !sentStatusCode : "already sent status code to " + peer;
     try {
-      RemoteBlockReader2.writeReadResult(peer.getOutputStream(), statusCode);
+      BlockReaderRemote2.writeReadResult(peer.getOutputStream(), statusCode);
       sentStatusCode = true;
     } catch (IOException e) {
       // It's ok not to be able to send this. But something is probably wrong.
@@ -478,14 +480,14 @@ void sendReadResult(Peer peer, Status statusCode) {
 
   @Override
   public int read(ByteBuffer buf) throws IOException {
-    throw new UnsupportedOperationException("readDirect unsupported in RemoteBlockReader");
+    throw new UnsupportedOperationException("readDirect unsupported in BlockReaderRemote");
   }
 
   @Override
   public int available() {
     // An optimistic estimate of how much data is available
     // to us without doing network I/O.
-    return RemoteBlockReader2.TCP_WINDOW_SIZE;
+    return BlockReaderRemote2.TCP_WINDOW_SIZE;
   }
 
   @Override

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/BlockReaderRemote2.java

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import java.io.BufferedOutputStream;
 import java.io.DataInputStream;
@@ -30,6 +30,8 @@
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.fs.ReadOption;
+import org.apache.hadoop.hdfs.BlockReader;
+import org.apache.hadoop.hdfs.PeerCache;
 import org.apache.hadoop.hdfs.net.Peer;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
@@ -78,13 +80,13 @@
  *
  * This is a new implementation introduced in Hadoop 0.23 which
  * is more efficient and simpler than the older BlockReader
- * implementation. It should be renamed to RemoteBlockReader
+ * implementation. It should be renamed to BlockReaderRemote
  * once we are confident in it.
  */
 @InterfaceAudience.Private
-public class RemoteBlockReader2  implements BlockReader {
+public class BlockReaderRemote2 implements BlockReader {
 
-  static final Logger LOG = LoggerFactory.getLogger(RemoteBlockReader2.class);
+  static final Logger LOG = LoggerFactory.getLogger(BlockReaderRemote2.class);
   static final int TCP_WINDOW_SIZE = 128 * 1024; // 128 KB;
 
   final private Peer peer;
@@ -138,7 +140,7 @@ public synchronized int read(byte[] buf, int off, int len)
     if (curDataSlice == null ||
         curDataSlice.remaining() == 0 && bytesNeededToFinish > 0) {
       try (TraceScope ignored = tracer.newScope(
-          "RemoteBlockReader2#readNextPacket(" + blockId + ")")) {
+          "BlockReaderRemote2#readNextPacket(" + blockId + ")")) {
         readNextPacket();
       }
     }
@@ -162,7 +164,7 @@ public synchronized int read(ByteBuffer buf) throws IOException {
     if (curDataSlice == null ||
         (curDataSlice.remaining() == 0 && bytesNeededToFinish > 0)) {
       try (TraceScope ignored = tracer.newScope(
-          "RemoteBlockReader2#readNextPacket(" + blockId + ")")) {
+          "BlockReaderRemote2#readNextPacket(" + blockId + ")")) {
         readNextPacket();
       }
     }
@@ -273,7 +275,7 @@ private void readTrailingEmptyPacket() throws IOException {
     }
   }
 
-  protected RemoteBlockReader2(String file, long blockId,
+  protected BlockReaderRemote2(String file, long blockId,
       DataChecksum checksum, boolean verifyChecksum,
       long startOffset, long firstChunkOffset, long bytesToRead, Peer peer,
       DatanodeID datanodeID, PeerCache peerCache, Tracer tracer,
@@ -425,7 +427,7 @@ public static BlockReader newBlockReader(String file,
           startOffset + " for file " + file);
     }
 
-    return new RemoteBlockReader2(file, block.getBlockId(), checksum,
+    return new BlockReaderRemote2(file, block.getBlockId(), checksum,
         verifyChecksum, startOffset, firstChunkOffset, len, peer, datanodeID,
         peerCache, tracer, networkDistance);
   }

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/BlockReaderUtil.java

@@ -15,9 +15,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.hdfs.BlockReader;
 
 import java.io.IOException;
 

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/ExternalBlockReader.java

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import java.io.IOException;
 import java.nio.ByteBuffer;
@@ -23,6 +23,8 @@
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.fs.ReadOption;
+import org.apache.hadoop.hdfs.BlockReader;
+import org.apache.hadoop.hdfs.ReplicaAccessor;
 import org.apache.hadoop.hdfs.shortcircuit.ClientMmap;
 import org.apache.hadoop.util.DataChecksum;
 

hadoop-hdfs-project/hadoop-hdfs/dev-support/findbugsExcludeFile.xml

@@ -133,7 +133,7 @@
 
      <!-- Don't complain about LocalDatanodeInfo's anonymous class -->
      <Match>
-       <Class name="org.apache.hadoop.hdfs.BlockReaderLocal$LocalDatanodeInfo$1" />
+       <Class name="org.apache.hadoop.hdfs.client.impl.BlockReaderLocal$LocalDatanodeInfo$1" />
        <Bug pattern="SE_BAD_FIELD_INNER_CLASS" />
      </Match>
      <!-- Only one method increments numFailedVolumes and it is synchronized -->

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/erasurecode/StripedBlockReader.java

@@ -23,7 +23,7 @@
 import org.apache.hadoop.hdfs.BlockReader;
 import org.apache.hadoop.hdfs.DFSUtilClient;
 import org.apache.hadoop.hdfs.DFSUtilClient.CorruptedBlocks;
-import org.apache.hadoop.hdfs.RemoteBlockReader2;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderRemote2;
 import org.apache.hadoop.hdfs.net.Peer;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
@@ -112,7 +112,7 @@ private BlockReader createBlockReader(long offsetInBlock) {
          *
          * TODO: add proper tracer
          */
-      return RemoteBlockReader2.newBlockReader(
+      return BlockReaderRemote2.newBlockReader(
           "dummy", block, blockToken, offsetInBlock,
           block.getNumBytes() - offsetInBlock, true,
           "", newConnectedPeer(block, dnAddr, blockToken, source), source,

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

@@ -43,7 +43,7 @@
 import org.apache.hadoop.fs.StorageType;
 import org.apache.hadoop.fs.UnresolvedLinkException;
 import org.apache.hadoop.hdfs.BlockReader;
-import org.apache.hadoop.hdfs.BlockReaderFactory;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderFactory;
 import org.apache.hadoop.hdfs.DFSClient;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtilClient;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestEnhancedByteBufferAccess.java

@@ -38,7 +38,7 @@
 import org.apache.commons.lang.mutable.MutableBoolean;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.apache.hadoop.hdfs.BlockReaderTestUtil;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderTestUtil;
 import org.apache.hadoop.hdfs.ClientContext;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSTestUtil;
@@ -48,7 +48,6 @@
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.hdfs.client.HdfsDataInputStream;
-import org.apache.hadoop.hdfs.client.impl.DfsClientConf;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/StripedFileTestUtil.java

@@ -25,6 +25,7 @@
 import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderTestUtil;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestConnCache.java

@@ -26,6 +26,7 @@
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderTestUtil;
 import org.junit.Assert;
 import org.junit.Test;
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDisableConnCache.java

@@ -24,6 +24,7 @@
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderTestUtil;
 import org.junit.Test;
 
 /**

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestParallelReadUtil.java

@@ -28,6 +28,7 @@
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderTestUtil;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.util.Time;
 import org.apache.log4j.Level;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/BlockReaderTestUtil.java

@@ -16,7 +16,7 @@
  * limitations under the License.
  */
 
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
@@ -32,6 +32,15 @@
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.FsTracer;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.BlockReader;
+import org.apache.hadoop.hdfs.ClientContext;
+import org.apache.hadoop.hdfs.DFSClient;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.hdfs.DFSUtilClient;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.hdfs.HdfsConfiguration;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.RemotePeerFactory;
 import org.apache.hadoop.hdfs.net.Peer;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/TestBlockReaderBase.java

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import static org.junit.Assert.assertEquals;
 
@@ -24,6 +24,9 @@
 
 import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.BlockReader;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.junit.After;
 import org.junit.Before;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/TestBlockReaderFactory.java

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCK_SIZE_KEY;
 import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_CLIENT_CONTEXT;
@@ -41,6 +41,11 @@
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.BlockReader;
+import org.apache.hadoop.hdfs.DFSInputStream;
+import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
@@ -327,7 +332,7 @@ public void testShortCircuitReadFromServerWithoutShm() throws Exception {
         calculateFileContentsFromSeed(SEED, TEST_FILE_LEN);
     Assert.assertTrue(Arrays.equals(contents, expected));
     final ShortCircuitCache cache =
-        fs.dfs.getClientContext().getShortCircuitCache();
+        fs.getClient().getClientContext().getShortCircuitCache();
     final DatanodeInfo datanode =
         new DatanodeInfo(cluster.getDataNodes().get(0).getDatanodeId());
     cache.getDfsClientShmManager().visit(new Visitor() {
@@ -375,7 +380,7 @@ public void testShortCircuitReadFromClientWithoutShm() throws Exception {
         calculateFileContentsFromSeed(SEED, TEST_FILE_LEN);
     Assert.assertTrue(Arrays.equals(contents, expected));
     final ShortCircuitCache cache =
-        fs.dfs.getClientContext().getShortCircuitCache();
+        fs.getClient().getClientContext().getShortCircuitCache();
     Assert.assertEquals(null, cache.getDfsClientShmManager());
     cluster.shutdown();
     sockDir.close();
@@ -407,7 +412,7 @@ public void testShortCircuitCacheShutdown() throws Exception {
         calculateFileContentsFromSeed(SEED, TEST_FILE_LEN);
     Assert.assertTrue(Arrays.equals(contents, expected));
     final ShortCircuitCache cache =
-        fs.dfs.getClientContext().getShortCircuitCache();
+        fs.getClient().getClientContext().getShortCircuitCache();
     cache.close();
     Assert.assertTrue(cache.getDfsClientShmManager().
         getDomainSocketWatcher().isClosed());

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/TestBlockReaderLocal.java

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import static org.hamcrest.CoreMatchers.equalTo;
 
@@ -32,9 +32,15 @@
 import org.apache.hadoop.fs.FSDataInputStream;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.ClientContext;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.hdfs.DFSInputStream;
+import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.ExtendedBlockId;
+import org.apache.hadoop.hdfs.HdfsConfiguration;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.hdfs.client.HdfsDataInputStream;
-import org.apache.hadoop.hdfs.client.impl.DfsClientConf;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.server.datanode.CachingStrategy;
 import org.apache.hadoop.hdfs.shortcircuit.ShortCircuitCache;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/TestBlockReaderLocalLegacy.java

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
@@ -30,6 +30,13 @@
 import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.hdfs.DFSInputStream;
+import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.DFSUtilClient;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
+import org.apache.hadoop.hdfs.HdfsConfiguration;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.hdfs.protocol.BlockLocalPathInfo;
 import org.apache.hadoop.hdfs.protocol.ClientDatanodeProtocol;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/TestBlockReaderRemote.java

@@ -15,11 +15,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
+import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 
-public class TestRemoteBlockReader extends TestBlockReaderBase {
+public class TestBlockReaderRemote extends TestBlockReaderBase {
 
   HdfsConfiguration createConf() {
     HdfsConfiguration conf = new HdfsConfiguration();

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/TestBlockReaderRemote2.java

@@ -15,9 +15,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
-public class TestRemoteBlockReader2 extends TestBlockReaderBase {
+import org.apache.hadoop.hdfs.HdfsConfiguration;
+
+public class TestBlockReaderRemote2 extends TestBlockReaderBase {
   HdfsConfiguration createConf() {
     HdfsConfiguration conf = new HdfsConfiguration();
     return conf;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/TestClientBlockVerification.java

@@ -16,7 +16,7 @@
  * limitations under the License.
  */
 
-package org.apache.hadoop.hdfs;
+package org.apache.hadoop.hdfs.client.impl;
 
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.spy;
@@ -25,6 +25,7 @@
 import java.util.List;
 
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.DFSClient;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.Status;
 import org.apache.hadoop.test.GenericTestUtils;
@@ -41,7 +42,7 @@ public class TestClientBlockVerification {
   static LocatedBlock testBlock = null;
 
   static {
-    GenericTestUtils.setLogLevel(RemoteBlockReader2.LOG, Level.ALL);
+    GenericTestUtils.setLogLevel(BlockReaderRemote2.LOG, Level.ALL);
   }
   @BeforeClass
   public static void setupCluster() throws Exception {
@@ -57,7 +58,7 @@ public static void setupCluster() throws Exception {
    */
   @Test
   public void testBlockVerification() throws Exception {
-    RemoteBlockReader2 reader = (RemoteBlockReader2)spy(
+    BlockReaderRemote2 reader = (BlockReaderRemote2)spy(
         util.getBlockReader(testBlock, 0, FILE_SIZE_K * 1024));
     util.readAndCheckEOS(reader, FILE_SIZE_K * 1024, true);
     verify(reader).sendReadResult(Status.CHECKSUM_OK);
@@ -69,7 +70,7 @@ public void testBlockVerification() throws Exception {
    */
   @Test
   public void testIncompleteRead() throws Exception {
-    RemoteBlockReader2 reader = (RemoteBlockReader2)spy(
+    BlockReaderRemote2 reader = (BlockReaderRemote2)spy(
         util.getBlockReader(testBlock, 0, FILE_SIZE_K * 1024));
     util.readAndCheckEOS(reader, FILE_SIZE_K / 2 * 1024, false);
 
@@ -87,7 +88,7 @@ public void testIncompleteRead() throws Exception {
   @Test
   public void testCompletePartialRead() throws Exception {
     // Ask for half the file
-    RemoteBlockReader2 reader = (RemoteBlockReader2)spy(
+    BlockReaderRemote2 reader = (BlockReaderRemote2)spy(
         util.getBlockReader(testBlock, 0, FILE_SIZE_K * 1024 / 2));
     // And read half the file
     util.readAndCheckEOS(reader, FILE_SIZE_K * 1024 / 2, true);
@@ -107,7 +108,7 @@ public void testUnalignedReads() throws Exception {
       for (int length : lengths) {
         DFSClient.LOG.info("Testing startOffset = " + startOffset + " and " +
                            " len=" + length);
-        RemoteBlockReader2 reader = (RemoteBlockReader2)spy(
+        BlockReaderRemote2 reader = (BlockReaderRemote2)spy(
             util.getBlockReader(testBlock, startOffset, length));
         util.readAndCheckEOS(reader, length, true);
         verify(reader).sendReadResult(Status.CHECKSUM_OK);

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockTokenWithDFS.java

@@ -35,7 +35,7 @@
 import org.apache.hadoop.fs.FsTracer;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.BlockReader;
-import org.apache.hadoop.hdfs.BlockReaderFactory;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderFactory;
 import org.apache.hadoop.hdfs.ClientContext;
 import org.apache.hadoop.hdfs.DFSClient;
 import org.apache.hadoop.hdfs.DFSConfigKeys;

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

@@ -42,7 +42,7 @@
 import org.apache.hadoop.fs.FsTracer;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.BlockReader;
-import org.apache.hadoop.hdfs.BlockReaderFactory;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderFactory;
 import org.apache.hadoop.hdfs.ClientContext;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSTestUtil;

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

@@ -43,7 +43,7 @@
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.RemoteIterator;
 import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
-import org.apache.hadoop.hdfs.BlockReaderTestUtil;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderTestUtil;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSTestUtil;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
@@ -59,7 +59,6 @@
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetCache;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetCache.PageRounder;
-import org.apache.hadoop.hdfs.server.namenode.EditLogFileOutputStream;
 import org.apache.hadoop.hdfs.server.namenode.FSImage;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.protocol.BlockIdCommand;

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

@@ -27,7 +27,7 @@
 import org.apache.hadoop.fs.FSDataInputStream;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.ReadOption;
-import org.apache.hadoop.hdfs.BlockReaderTestUtil;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderTestUtil;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSTestUtil;
 import org.apache.hadoop.hdfs.DistributedFileSystem;

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

@@ -55,7 +55,7 @@
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.RemoteIterator;
 import org.apache.hadoop.fs.permission.FsPermission;
-import org.apache.hadoop.hdfs.BlockReaderTestUtil;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderTestUtil;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSTestUtil;
 import org.apache.hadoop.hdfs.DistributedFileSystem;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitCache.java

@@ -39,8 +39,8 @@
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FSDataInputStream;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hdfs.BlockReaderFactory;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderFactory;
-import org.apache.hadoop.hdfs.BlockReaderTestUtil;
+import org.apache.hadoop.hdfs.client.impl.BlockReaderTestUtil;
 import org.apache.hadoop.hdfs.DFSInputStream;
 import org.apache.hadoop.hdfs.DFSTestUtil;
 import org.apache.hadoop.hdfs.DistributedFileSystem;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitLocalRead.java

@@ -45,7 +45,7 @@
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
-import org.apache.hadoop.hdfs.TestBlockReaderLocal;
+import org.apache.hadoop.hdfs.client.impl.TestBlockReaderLocal;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.hdfs.client.HdfsDataInputStream;
 import org.apache.hadoop.hdfs.protocol.ClientDatanodeProtocol;
@@ -54,7 +54,6 @@
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
 import org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtocol;
 import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
-import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.net.unix.DomainSocket;
 import org.apache.hadoop.net.unix.TemporarySocketDirectory;
@@ -593,7 +592,7 @@ public void testReadWithRemoteBlockReader()
 
   /**
    * Test that file data can be read by reading the block
-   * through RemoteBlockReader
+   * through BlockReaderRemote
    * @throws IOException
   */
   public void doTestShortCircuitReadWithRemoteBlockReader(
@@ -623,9 +622,9 @@ public void doTestShortCircuitReadWithRemoteBlockReader(
     try {
       checkFileContent(uri, file1, fileData, readOffset, shortCircuitUser, 
           conf, shortCircuitFails);
-      //RemoteBlockReader have unsupported method read(ByteBuffer bf)
+      //BlockReaderRemote have unsupported method read(ByteBuffer bf)
       assertTrue(
-          "RemoteBlockReader unsupported method read(ByteBuffer bf) error",
+          "BlockReaderRemote unsupported method read(ByteBuffer bf) error",
           checkUnsupportedMethod(fs, file1, fileData, readOffset));
     } catch(IOException e) {
       throw new IOException(