HADOOP-18271.Remove unused Imports in Hadoop Common project (#4392)

Co-authored-by: Ashutosh Gupta <ashugpt@amazon.com>

hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/util/CertificateUtil.java

@@ -18,7 +18,6 @@
 package org.apache.hadoop.security.authentication.util;
 
 import java.io.ByteArrayInputStream;
-import java.io.UnsupportedEncodingException;
 import java.nio.charset.StandardCharsets;
 import java.security.PublicKey;
 import java.security.cert.CertificateException;

hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/server/TestJWTRedirectAuthenticationHandler.java

@@ -25,7 +25,6 @@ import java.security.interfaces.RSAPublicKey;
 import java.util.List;
 import java.util.ArrayList;
 import java.util.Properties;
-import java.util.Vector;
 import java.util.Date;
 
 import javax.servlet.ServletException;

hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/server/TestPseudoAuthenticationHandler.java

@@ -13,7 +13,6 @@
  */
 package org.apache.hadoop.security.authentication.server;
 
-import org.apache.hadoop.security.authentication.client.AuthenticationException;
 import org.apache.hadoop.security.authentication.client.PseudoAuthenticator;
 import org.junit.Assert;
 import org.junit.Test;

hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/util/StringSignerSecretProvider.java

@@ -18,7 +18,6 @@ import java.util.Properties;
 import javax.servlet.ServletContext;
 
 import org.apache.hadoop.classification.VisibleForTesting;
-import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.security.authentication.server.AuthenticationFilter;
 

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/KeyProviderCryptoExtension.java

@@ -25,10 +25,6 @@ import java.security.SecureRandom;
 import java.util.List;
 import java.util.ListIterator;
 
-import javax.crypto.Cipher;
-import javax.crypto.spec.IvParameterSpec;
-import javax.crypto.spec.SecretKeySpec;
-
 import org.apache.hadoop.util.Preconditions;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.crypto.CryptoCodec;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/kms/LoadBalancingKMSClientProvider.java

@@ -31,7 +31,6 @@ import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import javax.net.ssl.SSLException;
-import javax.net.ssl.SSLHandshakeException;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.crypto.key.KeyProvider;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/DefaultCodec.java

@@ -26,7 +26,6 @@ import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configurable;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.io.compress.zlib.ZlibDecompressor;
 import org.apache.hadoop.io.compress.zlib.ZlibFactory;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/codec/ErasureCodec.java

@@ -19,7 +19,6 @@ package org.apache.hadoop.io.erasurecode.codec;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.io.erasurecode.CodecUtil;
 import org.apache.hadoop.io.erasurecode.ECSchema;
 import org.apache.hadoop.io.erasurecode.ErasureCodecOptions;
 import org.apache.hadoop.io.erasurecode.ErasureCoderOptions;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/AsyncCallHandler.java

@@ -28,7 +28,6 @@ import org.apache.hadoop.util.concurrent.AsyncGet;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.io.InterruptedIOException;
 import java.lang.reflect.Method;
 import java.util.Iterator;
 import java.util.Queue;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/RetryPolicies.java

@@ -41,7 +41,6 @@ import org.apache.hadoop.ipc.StandbyException;
 import org.apache.hadoop.net.ConnectTimeoutException;
 import org.apache.hadoop.security.AccessControlException;
 import org.apache.hadoop.security.token.SecretManager.InvalidToken;
-import org.ietf.jgss.GSSException;
 
 import org.apache.hadoop.classification.VisibleForTesting;
 import org.slf4j.Logger;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/IdMappingServiceProvider.java

@@ -18,11 +18,9 @@
 package org.apache.hadoop.security;
 
 import java.io.IOException;
-import java.util.List;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
-import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 
 /**
  * An interface for the implementation of {@literal <}userId,

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/http/CrossOriginFilter.java

@@ -22,7 +22,6 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
-import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import javax.servlet.Filter;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/ssl/ReloadingX509TrustManager.java

@@ -27,7 +27,6 @@ import org.slf4j.LoggerFactory;
 import javax.net.ssl.TrustManager;
 import javax.net.ssl.TrustManagerFactory;
 import javax.net.ssl.X509TrustManager;
-import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.file.Files;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/HttpUserGroupInformation.java

@@ -20,8 +20,6 @@ package org.apache.hadoop.security.token.delegation.web;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.security.UserGroupInformation;
 
-import javax.servlet.http.HttpServletRequest;
-
 /**
  * Util class that returns the remote {@link UserGroupInformation} in scope
  * for the HTTP request.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/FindClass.java

@@ -20,7 +20,6 @@ package org.apache.hadoop.util;
 import org.apache.hadoop.classification.VisibleForTesting;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
-import org.apache.hadoop.util.StringUtils;
 import org.apache.hadoop.util.Tool;
 import org.apache.hadoop.util.ToolRunner;
 import java.io.IOException;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ReflectionUtils.java

@@ -21,7 +21,6 @@ package org.apache.hadoop.util;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.PrintStream;
-import java.io.PrintWriter;
 import java.io.UnsupportedEncodingException;
 import java.lang.management.ManagementFactory;
 import java.lang.management.ThreadInfo;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/cli/util/CommandExecutor.java

@@ -23,7 +23,6 @@ import org.apache.hadoop.cli.CLITestHelper;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.PrintStream;
-import java.util.StringTokenizer;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.ArrayList;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestCommonConfigurationFields.java

@@ -21,21 +21,17 @@ package org.apache.hadoop.conf;
 import java.util.HashSet;
 
 import org.apache.hadoop.crypto.key.kms.KMSClientProvider;
-import org.apache.hadoop.fs.AbstractFileSystem;
 import org.apache.hadoop.fs.CommonConfigurationKeys;
 import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.fs.ftp.FtpConfigKeys;
 import org.apache.hadoop.fs.local.LocalConfigKeys;
 import org.apache.hadoop.ha.SshFenceByTcpPort;
 import org.apache.hadoop.ha.ZKFailoverController;
-import org.apache.hadoop.http.HttpServer2;
 import org.apache.hadoop.io.erasurecode.CodecUtil;
-import org.apache.hadoop.io.nativeio.NativeIO;
 import org.apache.hadoop.security.CompositeGroupsMapping;
 import org.apache.hadoop.security.HttpCrossOriginFilterInitializer;
 import org.apache.hadoop.security.LdapGroupsMapping;
 import org.apache.hadoop.security.RuleBasedLdapGroupsMapping;
-import org.apache.hadoop.security.http.CrossOriginFilter;
 import org.apache.hadoop.security.ssl.SSLFactory;
 
 /**

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestConfigurationDeprecation.java

@@ -30,7 +30,6 @@ import java.io.ByteArrayOutputStream;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
-import java.util.Random;
 import java.util.concurrent.Callable;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Future;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/crypto/TestCryptoStreamsForLocalFS.java

@@ -25,7 +25,6 @@ import java.io.InputStream;
 import java.io.OutputStream;
 
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.FileUtil;
 import org.apache.hadoop.fs.LocalFileSystem;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/crypto/random/TestOsSecureRandom.java

@@ -22,7 +22,7 @@ import java.util.Arrays;
 
 import org.apache.commons.lang3.SystemUtils;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.util.Shell.ShellCommandExecutor;
+
 import org.junit.Assume;
 import org.junit.Test;
 

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/AbstractContractDeleteTest.java

@@ -19,7 +19,7 @@
 package org.apache.hadoop.fs.contract;
 
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.fs.FileSystem;
+
 import org.junit.Test;
 
 import java.io.IOException;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/ftp/FTPContract.java

@@ -22,7 +22,6 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.contract.AbstractBondedFSContract;
-import org.junit.Assert;
 
 import java.net.URI;
 

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/rawlocal/TestRawLocalContractUnderlyingFileBehavior.java

@@ -19,7 +19,7 @@
 package org.apache.hadoop.fs.contract.rawlocal;
 
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.contract.ContractTestUtils;
+
 import org.junit.Assert;
 import org.junit.BeforeClass;
 import org.junit.Test;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/rawlocal/TestRawlocalContractPathHandle.java

@@ -21,7 +21,6 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Options;
 import org.apache.hadoop.fs.contract.AbstractContractPathHandleTest;
 import org.apache.hadoop.fs.contract.AbstractFSContract;
-import org.apache.hadoop.fs.contract.localfs.LocalFSContract;
 import org.apache.hadoop.fs.contract.rawlocal.RawlocalFSContract;
 
 public class TestRawlocalContractPathHandle

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/TestPathData.java

@@ -24,7 +24,6 @@ import static org.junit.Assert.fail;
 
 import java.io.File;
 import java.io.IOException;
-import java.net.URI;
 import java.util.Arrays;
 
 import org.apache.hadoop.conf.Configuration;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/TestTextCommand.java

@@ -25,15 +25,12 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.StringWriter;
-import java.lang.reflect.Method;
 import java.net.URI;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
-import java.nio.file.Paths;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.test.GenericTestUtils;
 import org.junit.Test;
 

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFileSystemWithAuthorityLocalFileSystem.java

@@ -22,7 +22,6 @@ import java.net.URI;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
-import org.apache.hadoop.fs.FileSystemTestHelper;
 import org.apache.hadoop.fs.FsConstants;
 import org.apache.hadoop.fs.Path;
 import static org.apache.hadoop.fs.FileSystem.TRASH_PREFIX;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/viewfs/ViewFileSystemTestSetup.java

@@ -20,7 +20,6 @@ package org.apache.hadoop.fs.viewfs;
 import java.net.URI;
 
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.FileContext;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.FileSystemTestHelper;
 import org.apache.hadoop.fs.FsConstants;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/TestHttpServerLifecycle.java

@@ -17,8 +17,6 @@
  */
 package org.apache.hadoop.http;
 
-import org.apache.hadoop.test.GenericTestUtils;
-import org.apache.log4j.Logger;
 import org.junit.Test;
 
 public class TestHttpServerLifecycle extends HttpServerFunctionalTest {

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/TestCodec.java

@@ -78,7 +78,6 @@ import org.apache.hadoop.util.LineReader;
 import org.apache.hadoop.util.NativeCodeLoader;
 import org.apache.hadoop.util.ReflectionUtils;
 import org.junit.After;
-import org.junit.Assert;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/bzip2/TestBzip2CompressorDecompressor.java

@@ -18,9 +18,6 @@
 package org.apache.hadoop.io.compress.bzip2;
 
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.io.DataInputBuffer;
-import org.apache.hadoop.io.DataOutputBuffer;
-import org.apache.hadoop.io.compress.*;
 import org.apache.hadoop.io.compress.bzip2.Bzip2Compressor;
 import org.apache.hadoop.io.compress.bzip2.Bzip2Decompressor;
 import org.apache.hadoop.test.MultithreadedTestUtil;
@@ -32,7 +29,6 @@ import java.util.Random;
 
 import static org.junit.Assert.*;
 import static org.junit.Assume.*;
-import static org.junit.Assume.assumeTrue;
 
 public class TestBzip2CompressorDecompressor {
   

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java

@@ -28,7 +28,6 @@ import java.util.Random;
 import java.util.zip.DeflaterOutputStream;
 
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.CommonConfigurationKeys;
 import org.apache.hadoop.io.DataInputBuffer;
 import org.apache.hadoop.io.compress.CompressDecompressTester;
 import org.apache.hadoop.io.compress.Compressor;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/file/tfile/TestCompression.java

@@ -17,15 +17,12 @@
  */
 package org.apache.hadoop.io.file.tfile;
 
-import org.apache.hadoop.io.compress.CompressionCodec;
 import org.apache.hadoop.test.LambdaTestUtils;
 import org.junit.*;
 
 import java.io.IOException;
 
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 
 public class TestCompression {
 

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/MiniRPCBenchmark.java

@@ -36,7 +36,6 @@ import org.apache.hadoop.security.KerberosInfo;
 import org.apache.hadoop.security.SecurityUtil;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.authorize.DefaultImpersonationProvider;
-import org.apache.hadoop.security.authorize.ProxyUsers;
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.security.token.TokenInfo;
 import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSelector;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestDNS.java

@@ -18,8 +18,6 @@
 
 package org.apache.hadoop.net;
 
-import java.lang.reflect.Field;
-import java.lang.reflect.Modifier;
 import java.net.NetworkInterface;
 import java.net.SocketException;
 import java.net.UnknownHostException;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestTableMapping.java

@@ -30,7 +30,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 import org.apache.hadoop.conf.Configuration;
-import org.junit.Before;
+
 import org.junit.Test;
 
 public class TestTableMapping {

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestKDiagNoKDC.java

@@ -19,8 +19,7 @@
 package org.apache.hadoop.security;
 
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.minikdc.MiniKdc;
-import org.junit.AfterClass;
+
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.BeforeClass;
@@ -31,20 +30,12 @@ import org.junit.rules.Timeout;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.io.File;
-import java.util.Properties;
 import java.util.concurrent.TimeUnit;
 
 import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_TOKEN_FILES;
-import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHENTICATION;
 import static org.apache.hadoop.security.KDiag.ARG_KEYLEN;
-import static org.apache.hadoop.security.KDiag.ARG_KEYTAB;
 import static org.apache.hadoop.security.KDiag.ARG_NOFAIL;
 import static org.apache.hadoop.security.KDiag.ARG_NOLOGIN;
-import static org.apache.hadoop.security.KDiag.ARG_PRINCIPAL;
-import static org.apache.hadoop.security.KDiag.ARG_SECURE;
-import static org.apache.hadoop.security.KDiag.CAT_CONFIG;
-import static org.apache.hadoop.security.KDiag.CAT_KERBEROS;
 import static org.apache.hadoop.security.KDiag.CAT_LOGIN;
 import static org.apache.hadoop.security.KDiag.CAT_TOKEN;
 import static org.apache.hadoop.security.KDiag.KerberosDiagsFailure;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUGIWithMiniKdc.java

@@ -19,23 +19,18 @@ package org.apache.hadoop.security;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.minikdc.MiniKdc;
-import org.apache.hadoop.security.authentication.util.KerberosUtil;
 import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.hadoop.test.LambdaTestUtils;
-import org.apache.hadoop.util.PlatformName;
+
 import org.junit.After;
 import org.junit.Test;
 import org.slf4j.event.Level;
 
-import javax.security.auth.Subject;
 import javax.security.auth.kerberos.KerberosPrincipal;
-import javax.security.auth.login.AppConfigurationEntry;
 import javax.security.auth.login.LoginContext;
 import java.io.File;
 import java.security.Principal;
-import java.util.HashMap;
 import java.util.HashSet;
-import java.util.Map;
 import java.util.Properties;
 import java.util.Set;
 

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/http/TestCrossOriginFilter.java

@@ -36,9 +36,6 @@ import org.junit.Assert;
 import org.junit.Test;
 import org.mockito.Mockito;
 
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.verify;
-
 public class TestCrossOriginFilter {
 
   @Test

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/service/launcher/TestServiceLauncher.java

@@ -29,8 +29,6 @@ import org.apache.hadoop.service.launcher.testservices.RunningService;
 import org.apache.hadoop.service.launcher.testservices.StoppingInStartLaunchableService;
 import org.apache.hadoop.service.launcher.testservices.StringConstructorOnlyService;
 
-import static org.apache.hadoop.service.launcher.LauncherArguments.*;
-
 import static org.apache.hadoop.test.GenericTestUtils.*;
 import static org.apache.hadoop.service.launcher.testservices.ExceptionInExecuteLaunchableService.*;
 

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/service/launcher/testservices/NoArgsAllowedService.java

@@ -26,7 +26,6 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.util.List;
-import java.util.Map;
 
 /**
  * service that does not allow any arguments.

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/test/TestTimedOutTestsListener.java

@@ -19,7 +19,6 @@ package org.apache.hadoop.test;
 
 import java.io.PrintWriter;
 import java.io.StringWriter;
-import java.util.concurrent.BrokenBarrierException;
 import java.util.concurrent.CyclicBarrier;
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/tools/TestCommandShell.java

@@ -24,7 +24,6 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.tools.CommandShell;
 
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import org.junit.Before;
 import org.junit.Test;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestDiskCheckerWithDiskIo.java

@@ -23,15 +23,12 @@ import org.apache.hadoop.util.DiskChecker.FileIoProvider;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.Timeout;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.nio.file.Files;
-import java.nio.file.attribute.PosixFilePermission;
 import java.nio.file.attribute.PosixFilePermissions;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestShell.java

@@ -20,7 +20,7 @@ package org.apache.hadoop.util;
 import java.util.concurrent.TimeUnit;
 import java.util.function.Supplier;
 import org.apache.commons.io.FileUtils;
-import org.apache.hadoop.security.alias.AbstractJavaKeyStoreProvider;
+
 import org.junit.Assert;
 
 import java.io.BufferedReader;

hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/FSINFO3Response.java

@@ -18,7 +18,6 @@
 package org.apache.hadoop.nfs.nfs3.response;
 
 import org.apache.hadoop.nfs.NfsTime;
-import org.apache.hadoop.nfs.nfs3.FileHandle;
 import org.apache.hadoop.nfs.nfs3.Nfs3FileAttributes;
 import org.apache.hadoop.nfs.nfs3.Nfs3Status;
 import org.apache.hadoop.oncrpc.XDR;

hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/FSSTAT3Response.java

@@ -17,7 +17,6 @@
  */
 package org.apache.hadoop.nfs.nfs3.response;
 
-import org.apache.hadoop.nfs.nfs3.FileHandle;
 import org.apache.hadoop.nfs.nfs3.Nfs3FileAttributes;
 import org.apache.hadoop.nfs.nfs3.Nfs3Status;
 import org.apache.hadoop.oncrpc.XDR;

hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/LINK3Response.java

@@ -17,8 +17,6 @@
  */
 package org.apache.hadoop.nfs.nfs3.response;
 
-import org.apache.hadoop.nfs.nfs3.Nfs3FileAttributes;
-import org.apache.hadoop.nfs.nfs3.Nfs3Status;
 import org.apache.hadoop.oncrpc.XDR;
 import org.apache.hadoop.oncrpc.security.Verifier;
 

hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/READDIR3Response.java

@@ -17,7 +17,6 @@
  */
 package org.apache.hadoop.nfs.nfs3.response;
 
-import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;

hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/READDIRPLUS3Response.java

@@ -25,8 +25,6 @@ import java.util.List;
 import org.apache.hadoop.nfs.nfs3.FileHandle;
 import org.apache.hadoop.nfs.nfs3.Nfs3FileAttributes;
 import org.apache.hadoop.nfs.nfs3.Nfs3Status;
-import org.apache.hadoop.nfs.nfs3.response.READDIR3Response.DirList3;
-import org.apache.hadoop.nfs.nfs3.response.READDIR3Response.Entry3;
 import org.apache.hadoop.oncrpc.XDR;
 import org.apache.hadoop.oncrpc.security.Verifier;
 

hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/REMOVE3Response.java

@@ -17,8 +17,6 @@
  */
 package org.apache.hadoop.nfs.nfs3.response;
 
-import org.apache.hadoop.nfs.nfs3.Nfs3FileAttributes;
-import org.apache.hadoop.nfs.nfs3.Nfs3Status;
 import org.apache.hadoop.oncrpc.XDR;
 import org.apache.hadoop.oncrpc.security.Verifier;
 

hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/WRITE3Response.java

@@ -17,9 +17,7 @@
  */
 package org.apache.hadoop.nfs.nfs3.response;
 
-import org.apache.hadoop.nfs.nfs3.FileHandle;
 import org.apache.hadoop.nfs.nfs3.Nfs3Constant;
-import org.apache.hadoop.nfs.nfs3.Nfs3FileAttributes;
 import org.apache.hadoop.nfs.nfs3.Nfs3Status;
 import org.apache.hadoop.nfs.nfs3.Nfs3Constant.WriteStableHow;
 import org.apache.hadoop.oncrpc.XDR;

hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/oncrpc/SimpleTcpClientHandler.java

@@ -18,11 +18,8 @@
 package org.apache.hadoop.oncrpc;
 
 import io.netty.buffer.ByteBuf;
-import io.netty.channel.ChannelFuture;
-import io.netty.channel.ChannelFutureListener;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInboundHandlerAdapter;
-import io.netty.util.ReferenceCountUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/oncrpc/security/SysSecurityHandler.java

@@ -17,7 +17,6 @@
  */
 package org.apache.hadoop.oncrpc.security;
 
-import org.apache.hadoop.nfs.nfs3.Nfs3Constant;
 import org.apache.hadoop.oncrpc.RpcCall;
 import org.apache.hadoop.security.IdMappingConstant;
 import org.apache.hadoop.security.IdMappingServiceProvider;

hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/binding/RegistryPathUtils.java

@@ -24,7 +24,6 @@ import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.fs.PathNotFoundException;
 import org.apache.hadoop.registry.client.exceptions.InvalidPathnameException;
 import org.apache.hadoop.registry.client.impl.zk.RegistryInternalConstants;
-import org.apache.hadoop.registry.server.dns.BaseServiceRecordProcessor;
 import org.apache.zookeeper.common.PathUtils;
 
 import java.net.IDN;

hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/binding/RegistryUtils.java

@@ -43,7 +43,6 @@ import java.io.IOException;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
-import java.util.Locale;
 import java.util.Map;
 
 /**

hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/impl/zk/RegistryOperationsService.java

@@ -28,7 +28,6 @@ import org.apache.hadoop.registry.client.binding.RegistryTypeUtils;
 import org.apache.hadoop.registry.client.binding.RegistryUtils;
 import org.apache.hadoop.registry.client.binding.RegistryPathUtils;
 import org.apache.hadoop.registry.client.exceptions.InvalidPathnameException;
-import org.apache.hadoop.registry.client.exceptions.NoRecordException;
 import org.apache.hadoop.registry.client.types.RegistryPathStatus;
 import org.apache.hadoop.registry.client.types.ServiceRecord;
 import org.apache.zookeeper.CreateMode;

hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/impl/zk/RegistrySecurity.java

@@ -33,7 +33,6 @@ import org.apache.hadoop.util.ZKUtil;
 import org.apache.zookeeper.Environment;
 import org.apache.zookeeper.ZooDefs;
 import org.apache.zookeeper.client.ZKClientConfig;
-import org.apache.zookeeper.client.ZooKeeperSaslClient;
 import org.apache.zookeeper.data.ACL;
 import org.apache.zookeeper.data.Id;
 import org.apache.zookeeper.server.auth.DigestAuthenticationProvider;