HDFS-2536. Remove unused imports. Contributed by Harsh J

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1204120 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -124,6 +124,8 @@ Release 0.23.1 - UNRELEASED
     HDFS-208. name node should warn if only one dir is listed in dfs.name.dir.
     (Uma Maheswara Rao G via eli)
 
+    HDFS-2536. Remove unused imports. (harsh via eli)
+
   OPTIMIZATIONS
 
     HDFS-2130. Switch default checksum to CRC32C. (todd)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/RemoteBlockReader.java

@@ -24,7 +24,6 @@
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
-import java.io.OutputStream;
 import java.net.InetSocketAddress;
 import java.net.Socket;
 import java.nio.ByteBuffer;
@@ -37,12 +36,9 @@
 import org.apache.hadoop.hdfs.protocol.datatransfer.PacketHeader;
 import org.apache.hadoop.hdfs.protocol.datatransfer.Sender;
 import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.BlockOpResponseProto;
-import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ClientReadStatusProto;
-import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpBlockChecksumResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto;
 import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.Status;
 import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
-import org.apache.hadoop.hdfs.security.token.block.InvalidBlockTokenException;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.net.NetUtils;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/ClientDatanodeProtocol.java

@@ -19,8 +19,6 @@
 
 import java.io.IOException;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.hdfs.DFSConfigKeys;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java

@@ -39,7 +39,6 @@
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
-import java.util.Random;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java

@@ -29,8 +29,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
-import java.util.TreeSet;
-
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.HadoopIllegalArgumentException;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeDescriptor.java

@@ -20,14 +20,10 @@
 import java.io.DataInput;
 import java.io.IOException;
 import java.util.ArrayList;
-import java.util.Collection;
 import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Queue;
-import java.util.Set;
-import java.util.TreeSet;
-
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.hdfs.DeprecatedUTF8;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/InvalidateBlocks.java

@@ -20,8 +20,6 @@
 import java.io.PrintWriter;
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.HashSet;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/UnderReplicatedBlocks.java

@@ -20,9 +20,6 @@
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
-import java.util.NavigableSet;
-import java.util.TreeSet;
-
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.util.LightWeightLinkedSet;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;

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

@@ -26,7 +26,6 @@
 import java.io.IOException;
 import java.io.RandomAccessFile;
 
-import org.apache.commons.httpclient.methods.GetMethod;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.util.DataChecksum;
 

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

@@ -50,7 +50,6 @@
 import org.apache.hadoop.io.nativeio.NativeIO;
 import org.apache.hadoop.util.Daemon;
 import org.apache.hadoop.util.DataChecksum;
-import org.apache.hadoop.util.PureJavaCrc32;
 
 /** A class that receives a block and writes to its own disk, meanwhile
  * may copies it to another site. If a throttler is provided,

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

@@ -48,8 +48,6 @@
 import org.apache.hadoop.hdfs.protocol.datatransfer.Receiver;
 import org.apache.hadoop.hdfs.protocol.datatransfer.Sender;
 import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.BlockOpResponseProto;
-import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.BlockOpResponseProto.Builder;
-import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.BlockOpResponseProtoOrBuilder;
 import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ClientReadStatusProto;
 import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpBlockChecksumResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.ReadOpChecksumInfoProto;

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

@@ -17,7 +17,6 @@
  */
 package org.apache.hadoop.hdfs.server.datanode;
 
-import java.io.DataInputStream;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;

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

@@ -17,14 +17,10 @@
  */
 package org.apache.hadoop.hdfs.server.namenode;
 
-import java.io.BufferedInputStream;
-import java.io.DataInputStream;
 import java.io.IOException;
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;
-import java.util.zip.Checksum;
-
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;

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

@@ -19,7 +19,6 @@
 
 import java.io.IOException;
 
-import org.apache.hadoop.hdfs.server.namenode.NNStorageRetentionManager.StoragePurger;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
 
 /**

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

@@ -36,7 +36,6 @@
 import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol;
 import org.apache.hadoop.hdfs.server.protocol.RemoteEditLog;
 import org.apache.hadoop.hdfs.server.protocol.RemoteEditLogManifest;
-import org.apache.hadoop.http.HttpServer;
 import org.apache.hadoop.io.MD5Hash;
 import org.apache.hadoop.util.Daemon;
 

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

@@ -23,8 +23,6 @@
 import javax.servlet.ServletContext;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;

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

@@ -26,10 +26,7 @@
 import java.io.DataInputStream;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.server.common.Storage;
-import org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.EditLogValidation;
 import org.apache.hadoop.io.IOUtils;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
-
 import com.google.common.annotations.VisibleForTesting;
 
 /**

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

@@ -37,7 +37,6 @@
 import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
 import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.*;
 import org.apache.hadoop.hdfs.server.namenode.JournalSet.JournalAndStream;
-import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeDirType;
 import org.apache.hadoop.hdfs.server.namenode.metrics.NameNodeMetrics;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
 import org.apache.hadoop.hdfs.server.protocol.RemoteEditLogManifest;

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

@@ -19,7 +19,6 @@
 
 import static org.apache.hadoop.hdfs.server.common.Util.now;
 
-import java.io.File;
 import java.io.FilterInputStream;
 import java.io.IOException;
 import java.io.InputStream;
@@ -34,7 +33,6 @@
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoUnderConstruction;
 import org.apache.hadoop.hdfs.server.common.Storage;
-import org.apache.hadoop.hdfs.server.namenode.EditLogFileInputStream.LogHeaderCorruptException;
 import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.AddCloseOp;
 import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.CancelDelegationTokenOp;
 import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.ClearNSQuotaOp;
@@ -57,8 +55,6 @@
 import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.UpdateMasterKeyOp;
 import org.apache.hadoop.hdfs.server.namenode.LeaseManager.Lease;
 import org.apache.hadoop.hdfs.util.Holder;
-import org.apache.hadoop.io.IOUtils;
-
 import com.google.common.base.Joiner;
 
 public class FSEditLogLoader {

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

@@ -19,8 +19,6 @@
 
 import java.io.File;
 import java.io.IOException;
-import java.util.List;
-
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;

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

@@ -23,28 +23,16 @@
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import java.util.SortedMap;
-import java.util.TreeMap;
-import java.util.TreeSet;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-import org.apache.commons.lang.StringUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.fs.FileUtil;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
 import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeDirType;
 import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeFile;
-import org.apache.hadoop.hdfs.server.protocol.RemoteEditLog;
-import org.apache.hadoop.hdfs.server.protocol.RemoteEditLogManifest;
-
-import com.google.common.base.Joiner;
 import com.google.common.collect.ImmutableList;
-import com.google.common.collect.Lists;
 
 class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
   public static final Log LOG = LogFactory.getLog(

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

@@ -19,8 +19,6 @@
 
 import java.io.IOException;
 import java.io.PrintWriter;
-import java.net.URI;
-import java.net.URISyntaxException;
 import java.net.URL;
 
 import javax.net.SocketFactory;

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

@@ -18,7 +18,6 @@
 package org.apache.hadoop.hdfs.server.namenode;
 
 import java.io.IOException;
-import java.net.URISyntaxException;
 import java.net.URL;
 import java.security.PrivilegedExceptionAction;
 

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

@@ -23,8 +23,6 @@
 import java.util.List;
 
 import org.apache.hadoop.fs.UnresolvedLinkException;
-import org.apache.hadoop.fs.permission.FsAction;
-import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.fs.permission.PermissionStatus;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.protocol.Block;

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

@@ -29,7 +29,6 @@
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
-import java.util.Random;
 import java.util.TreeSet;
 
 import org.apache.commons.logging.Log;

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

@@ -29,7 +29,6 @@
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
-import org.apache.hadoop.hdfs.server.common.JspHelper;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.token.Token;
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/RemoteEditLog.java

@@ -20,8 +20,6 @@
 import java.io.DataInput;
 import java.io.DataOutput;
 import java.io.IOException;
-import java.util.Comparator;
-
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.io.Writable;
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocolR23Compatible/BlockCommandWritable.java

@@ -20,17 +20,12 @@
 import java.io.DataInput;
 import java.io.DataOutput;
 import java.io.IOException;
-import java.util.List;
-
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
-import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocolR23Compatible.BlockWritable;
 import org.apache.hadoop.hdfs.protocolR23Compatible.DatanodeInfoWritable;
-import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor.BlockTargetPair;
 import org.apache.hadoop.hdfs.server.protocol.BlockCommand;
-import org.apache.hadoop.hdfs.server.protocol.DatanodeCommand;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.io.Writable;
 import org.apache.hadoop.io.WritableFactories;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSck.java

@@ -34,7 +34,6 @@
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.namenode.NamenodeFsck;
-import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.HdfsConfiguration;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DelegationTokenFetcher.java

@@ -40,7 +40,6 @@
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
-import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.HftpFileSystem;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineEditsViewer/EditsLoader.java

@@ -18,8 +18,6 @@
 package org.apache.hadoop.hdfs.tools.offlineEditsViewer;
 
 import java.io.IOException;
-import java.util.Map;
-
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineEditsViewer/EditsVisitor.java

@@ -22,8 +22,6 @@
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 
-import org.apache.hadoop.hdfs.DeprecatedUTF8;
-
 import static org.apache.hadoop.hdfs.tools.offlineEditsViewer.Tokenizer.ByteToken;
 import static org.apache.hadoop.hdfs.tools.offlineEditsViewer.Tokenizer.ShortToken;
 import static org.apache.hadoop.hdfs.tools.offlineEditsViewer.Tokenizer.IntToken;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineEditsViewer/EditsVisitorFactory.java

@@ -18,8 +18,6 @@
 package org.apache.hadoop.hdfs.tools.offlineEditsViewer;
 
 import java.io.IOException;
-import java.util.regex.Pattern;
-
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineEditsViewer/TokenizerFactory.java

@@ -18,8 +18,6 @@
 package org.apache.hadoop.hdfs.tools.offlineEditsViewer;
 
 import java.io.IOException;
-import java.util.regex.Pattern;
-
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/util/DirectBufferPool.java

@@ -19,11 +19,6 @@
 
 import java.lang.ref.WeakReference;
 import java.nio.ByteBuffer;
-import java.util.HashMap;
-import java.util.Iterator;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Map;
 import java.util.Queue;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentLinkedQueue;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/util/LightWeightHashSet.java

@@ -22,7 +22,6 @@
 import java.util.Collection;
 import java.util.ConcurrentModificationException;
 import java.util.Iterator;
-import java.util.LinkedList;
 import java.util.List;
 import java.util.NoSuchElementException;
 
@@ -615,4 +614,4 @@ public boolean removeAll(Collection<?> c) {
   public boolean retainAll(Collection<?> c) {
     throw new UnsupportedOperationException("retainAll is not supported.");
   }
-}
+}

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/cli/CLITestHelperDFS.java

@@ -18,7 +18,6 @@
 package org.apache.hadoop.cli;
 
 import org.apache.hadoop.cli.util.CLICommandDFSAdmin;
-import org.apache.hadoop.cli.util.CLITestCmd;
 import org.xml.sax.SAXException;
 
 public class CLITestHelperDFS extends CLITestHelper {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/cli/TestHDFSCLI.java

@@ -29,7 +29,6 @@
 import org.junit.After;
 import static org.junit.Assert.assertTrue;
 import org.junit.Before;
-import org.junit.Test;
 
 public class TestHDFSCLI extends CLITestHelperDFS {
 

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

@@ -36,7 +36,6 @@
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.apache.commons.math.stat.descriptive.rank.Min;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configuration;

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

@@ -25,7 +25,6 @@
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
-import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 

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

@@ -25,7 +25,6 @@
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException;
-import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocols;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.io.IOUtils;

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

@@ -20,8 +20,6 @@
 import java.net.InetSocketAddress;
 import java.net.Socket;
 import java.io.IOException;
-import java.util.List;
-
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
@@ -31,7 +29,6 @@
 import org.apache.hadoop.hdfs.DFSClient;
 import org.apache.hadoop.hdfs.DFSInputStream;
 import org.apache.hadoop.hdfs.SocketCache;
-import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;

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

@@ -26,10 +26,7 @@
 
 import java.io.IOException;
 import java.util.ArrayList;
-import junit.framework.Assert;
 import junit.framework.TestCase;
-import java.net.InetSocketAddress;
-
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption;

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

@@ -58,10 +58,7 @@
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.namenode.NotReplicatedYetException;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocols;
-import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.ipc.RemoteException;
-import org.apache.hadoop.ipc.Client;
-import org.apache.hadoop.ipc.ProtocolSignature;
 import org.apache.hadoop.ipc.RPC;
 import org.apache.hadoop.ipc.Server;
 import org.apache.hadoop.net.NetUtils;

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

@@ -30,7 +30,6 @@
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.FileUtil;
 import org.apache.hadoop.hdfs.server.common.StorageInfo;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.NodeType;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption;

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

@@ -33,7 +33,6 @@
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption;
 import org.apache.hadoop.hdfs.server.namenode.FSImageTestUtil;
-import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.hadoop.util.StringUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;

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

@@ -31,7 +31,6 @@
 
 import junit.framework.TestCase;
 
-import org.apache.commons.digester.SetRootRule;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;

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

@@ -20,9 +20,6 @@
 
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.commons.logging.impl.Log4JLogger;
-import org.apache.log4j.Level;
-
 import junit.framework.TestCase;
 
 public class TestDeprecatedKeys extends TestCase {

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

@@ -21,14 +21,12 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.RandomAccessFile;
-import java.util.EnumSet;
 import java.util.Random;
 
 import junit.framework.TestCase;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.ChecksumException;
-import org.apache.hadoop.fs.CreateFlag;
 import org.apache.hadoop.fs.FSDataInputStream;
 import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.FileSystem;

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

@@ -36,7 +36,6 @@
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.net.DNS;
-import org.apache.hadoop.test.GenericTestUtils;
 
 /**
  * This test checks correctness of port usage by hdfs components:

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

@@ -28,7 +28,6 @@
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 import org.junit.Test;
 
 import java.io.InterruptedIOException;

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

@@ -21,25 +21,14 @@
 import static 
   org.apache.hadoop.fs.CommonConfigurationKeys.HADOOP_SECURITY_AUTHENTICATION;
 
-import java.io.IOException;
 import java.lang.reflect.Field;
-import java.net.URISyntaxException;
 import java.net.URI;
-import java.net.URL;
-import java.net.HttpURLConnection;
 import java.security.PrivilegedExceptionAction;
-import java.util.Random;
-
 import org.junit.Test;
-import org.junit.BeforeClass;
-import org.junit.AfterClass;
 import static org.junit.Assert.*;
 
-import org.apache.commons.logging.impl.Log4JLogger;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
-import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.security.UserGroupInformation;

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

@@ -22,19 +22,12 @@
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.apache.commons.logging.impl.Log4JLogger;
-import org.apache.log4j.Level;
-
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FSDataInputStream;
 import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
-import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
-import org.apache.hadoop.hdfs.server.namenode.LeaseManager;
-
 import org.junit.Test;
 import static org.junit.Assert.assertTrue;
 

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

@@ -20,7 +20,6 @@
 
 import junit.framework.Assert;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.FileSystem;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/balancer/TestBalancerWithMultipleNameNodes.java

@@ -19,7 +19,6 @@
 
 import java.io.IOException;
 import java.net.InetSocketAddress;
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Random;

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

@@ -36,7 +36,6 @@
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState;
 import org.apache.hadoop.hdfs.server.datanode.FSDataset.BlockPoolSlice;
 import org.apache.hadoop.hdfs.server.datanode.FSDataset.FSVolumeSet;

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

@@ -38,7 +38,6 @@
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager;
-import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
 import org.apache.log4j.Level;
 import org.junit.After;
 import org.junit.Before;

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

@@ -18,20 +18,14 @@
 
 package org.apache.hadoop.hdfs.server.datanode;
 
-import java.io.File;
-import java.io.IOException;
 import java.net.InetSocketAddress;
-import java.util.AbstractList;
-
 import static org.junit.Assert.fail;
 import static org.mockito.Mockito.*;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
-import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.server.common.IncorrectVersionException;
 import org.apache.hadoop.hdfs.server.datanode.DataNode.BPOfferService;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeProtocol;
-import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
 import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
 import org.junit.Test;
 import org.mockito.Mockito;

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

@@ -25,14 +25,8 @@
 import java.net.InetSocketAddress;
 
 import java.net.SocketTimeoutException;
-import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.io.Writable;
 import org.apache.hadoop.io.LongWritable;
-import org.apache.hadoop.security.UserGroupInformation;
-import org.apache.hadoop.util.StringUtils;
-
-import org.apache.hadoop.ipc.Client;
-import org.apache.hadoop.ipc.ProtocolSignature;
 import org.apache.hadoop.ipc.RPC;
 import org.apache.hadoop.ipc.Server;
 import org.apache.hadoop.net.NetUtils;

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

@@ -20,8 +20,6 @@
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.fail;
-
 import java.io.File;
 import java.io.IOException;
 import java.net.URI;

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

@@ -18,8 +18,6 @@
 package org.apache.hadoop.hdfs.server.namenode;
 
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.assertEquals;
-
 import java.net.URL;
 import java.util.Collection;
 

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

@@ -46,7 +46,6 @@
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
-import org.apache.hadoop.hdfs.server.common.Util;
 import org.apache.hadoop.hdfs.server.namenode.EditLogFileInputStream;
 import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
 import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeDirType;

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

@@ -19,13 +19,8 @@
 
 import static org.junit.Assert.*;
 
-import static org.mockito.Mockito.doReturn;
-import static org.mockito.Mockito.spy;
-
 import java.io.File;
 import java.io.IOException;
-import java.util.List;
-
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
@@ -34,10 +29,8 @@
 import static org.apache.hadoop.hdfs.server.namenode.NNStorage.getFinalizedEditsFileName;
 import static org.apache.hadoop.hdfs.server.namenode.NNStorage.getImageFileName;
 
-import org.apache.hadoop.hdfs.server.namenode.FileJournalManager.EditLogFile;
 import org.apache.hadoop.hdfs.server.namenode.FSImageStorageInspector.FSImageFile;
 import org.junit.Test;
-import org.mockito.Mockito;
 
 public class TestFSImageStorageInspector {
   private static final Log LOG = LogFactory.getLog(

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

@@ -21,21 +21,13 @@
 
 import java.net.URI;
 import java.util.Collections;
-import java.util.Arrays;
 import java.util.List;
-import java.util.ArrayList;
 import java.util.Iterator;
 
 import java.io.RandomAccessFile;
 import java.io.File;
 import java.io.FilenameFilter;
-import java.io.BufferedInputStream;
-import java.io.DataInputStream;
 import java.io.IOException;
-import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.FileSystem;
-import org.apache.hadoop.hdfs.DFSConfigKeys;
-import org.apache.hadoop.security.SecurityUtil;
 import org.junit.Test;
 import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
 import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeDirType;
@@ -48,9 +40,6 @@
 import com.google.common.collect.ImmutableList;
 import com.google.common.base.Joiner;
 
-import java.util.zip.CheckedInputStream;
-import java.util.zip.Checksum;
-
 public class TestFileJournalManager {
 
   /** 

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

@@ -22,7 +22,6 @@
 import static org.junit.Assert.*;
 
 import static org.mockito.Matchers.anyObject;
-import static org.mockito.Matchers.anyLong;
 import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.spy;

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

@@ -30,7 +30,6 @@
 import org.apache.hadoop.hdfs.server.namenode.EditLogFileInputStream;
 import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
 import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeDirType;
-import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeFile;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.token.Token;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/security/TestPermission.java

@@ -18,7 +18,6 @@
 package org.apache.hadoop.security;
 
 import java.io.IOException;
-import java.util.EnumSet;
 import java.util.Random;
 
 import org.apache.commons.logging.Log;