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Posted to common-commits@hadoop.apache.org by pr...@apache.org on 2022/06/23 07:00:43 UTC
[hadoop] branch trunk updated: HADOOP-18271.Remove unused Imports in Hadoop Common project (#4392)
This is an automated email from the ASF dual-hosted git repository.
prabhujoseph pushed a commit to branch trunk
in repository https://gitbox.apache.org/repos/asf/hadoop.git
The following commit(s) were added to refs/heads/trunk by this push:
new dd819f7904c HADOOP-18271.Remove unused Imports in Hadoop Common project (#4392)
dd819f7904c is described below
commit dd819f7904ca437b74672a6cacb3df9966709a52
Author: Ashutosh Gupta <as...@st.niituniversity.in>
AuthorDate: Thu Jun 23 08:00:28 2022 +0100
HADOOP-18271.Remove unused Imports in Hadoop Common project (#4392)
Co-authored-by: Ashutosh Gupta <as...@amazon.com>
---
.../hadoop/security/authentication/util/CertificateUtil.java | 1 -
.../server/TestJWTRedirectAuthenticationHandler.java | 1 -
.../server/TestPseudoAuthenticationHandler.java | 1 -
.../authentication/util/StringSignerSecretProvider.java | 1 -
.../apache/hadoop/crypto/key/KeyProviderCryptoExtension.java | 4 ----
.../hadoop/crypto/key/kms/LoadBalancingKMSClientProvider.java | 1 -
.../main/java/org/apache/hadoop/io/compress/DefaultCodec.java | 1 -
.../org/apache/hadoop/io/erasurecode/codec/ErasureCodec.java | 1 -
.../java/org/apache/hadoop/io/retry/AsyncCallHandler.java | 1 -
.../main/java/org/apache/hadoop/io/retry/RetryPolicies.java | 1 -
.../org/apache/hadoop/security/IdMappingServiceProvider.java | 2 --
.../org/apache/hadoop/security/http/CrossOriginFilter.java | 1 -
.../apache/hadoop/security/ssl/ReloadingX509TrustManager.java | 1 -
.../token/delegation/web/HttpUserGroupInformation.java | 2 --
.../src/main/java/org/apache/hadoop/util/FindClass.java | 1 -
.../src/main/java/org/apache/hadoop/util/ReflectionUtils.java | 1 -
.../test/java/org/apache/hadoop/cli/util/CommandExecutor.java | 1 -
.../org/apache/hadoop/conf/TestCommonConfigurationFields.java | 4 ----
.../org/apache/hadoop/conf/TestConfigurationDeprecation.java | 1 -
.../org/apache/hadoop/crypto/TestCryptoStreamsForLocalFS.java | 1 -
.../org/apache/hadoop/crypto/random/TestOsSecureRandom.java | 2 +-
.../apache/hadoop/fs/contract/AbstractContractDeleteTest.java | 2 +-
.../java/org/apache/hadoop/fs/contract/ftp/FTPContract.java | 1 -
.../rawlocal/TestRawLocalContractUnderlyingFileBehavior.java | 2 +-
.../fs/contract/rawlocal/TestRawlocalContractPathHandle.java | 1 -
.../test/java/org/apache/hadoop/fs/shell/TestPathData.java | 1 -
.../test/java/org/apache/hadoop/fs/shell/TestTextCommand.java | 3 ---
.../TestViewFileSystemWithAuthorityLocalFileSystem.java | 1 -
.../org/apache/hadoop/fs/viewfs/ViewFileSystemTestSetup.java | 1 -
.../java/org/apache/hadoop/http/TestHttpServerLifecycle.java | 2 --
.../test/java/org/apache/hadoop/io/compress/TestCodec.java | 1 -
.../io/compress/bzip2/TestBzip2CompressorDecompressor.java | 4 ----
.../io/compress/zlib/TestZlibCompressorDecompressor.java | 1 -
.../java/org/apache/hadoop/io/file/tfile/TestCompression.java | 3 ---
.../src/test/java/org/apache/hadoop/ipc/MiniRPCBenchmark.java | 1 -
.../src/test/java/org/apache/hadoop/net/TestDNS.java | 2 --
.../src/test/java/org/apache/hadoop/net/TestTableMapping.java | 2 +-
.../test/java/org/apache/hadoop/security/TestKDiagNoKDC.java | 11 +----------
.../java/org/apache/hadoop/security/TestUGIWithMiniKdc.java | 7 +------
.../apache/hadoop/security/http/TestCrossOriginFilter.java | 3 ---
.../apache/hadoop/service/launcher/TestServiceLauncher.java | 2 --
.../service/launcher/testservices/NoArgsAllowedService.java | 1 -
.../org/apache/hadoop/test/TestTimedOutTestsListener.java | 1 -
.../test/java/org/apache/hadoop/tools/TestCommandShell.java | 1 -
.../org/apache/hadoop/util/TestDiskCheckerWithDiskIo.java | 3 ---
.../src/test/java/org/apache/hadoop/util/TestShell.java | 2 +-
.../org/apache/hadoop/nfs/nfs3/response/FSINFO3Response.java | 1 -
.../org/apache/hadoop/nfs/nfs3/response/FSSTAT3Response.java | 1 -
.../org/apache/hadoop/nfs/nfs3/response/LINK3Response.java | 2 --
.../org/apache/hadoop/nfs/nfs3/response/READDIR3Response.java | 1 -
.../apache/hadoop/nfs/nfs3/response/READDIRPLUS3Response.java | 2 --
.../org/apache/hadoop/nfs/nfs3/response/REMOVE3Response.java | 2 --
.../org/apache/hadoop/nfs/nfs3/response/WRITE3Response.java | 2 --
.../java/org/apache/hadoop/oncrpc/SimpleTcpClientHandler.java | 3 ---
.../org/apache/hadoop/oncrpc/security/SysSecurityHandler.java | 1 -
.../hadoop/registry/client/binding/RegistryPathUtils.java | 1 -
.../apache/hadoop/registry/client/binding/RegistryUtils.java | 1 -
.../registry/client/impl/zk/RegistryOperationsService.java | 1 -
.../hadoop/registry/client/impl/zk/RegistrySecurity.java | 1 -
59 files changed, 7 insertions(+), 101 deletions(-)
diff --git a/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/util/CertificateUtil.java b/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/util/CertificateUtil.java
index cf17aca15ce..f25602c67d4 100644
--- a/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/util/CertificateUtil.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/server/TestJWTRedirectAuthenticationHandler.java b/hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/server/TestJWTRedirectAuthenticationHandler.java
index 5a2db9ba6fd..7587bca2012 100644
--- a/hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/server/TestJWTRedirectAuthenticationHandler.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/server/TestPseudoAuthenticationHandler.java b/hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/server/TestPseudoAuthenticationHandler.java
index b52915d9cc4..ac6221d642a 100644
--- a/hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/server/TestPseudoAuthenticationHandler.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/util/StringSignerSecretProvider.java b/hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/util/StringSignerSecretProvider.java
index 5582c923ae0..ed6b1aeccc7 100644
--- a/hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/util/StringSignerSecretProvider.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/KeyProviderCryptoExtension.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/KeyProviderCryptoExtension.java
index d706e5ef100..f1bb3145820 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/KeyProviderCryptoExtension.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/kms/LoadBalancingKMSClientProvider.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/kms/LoadBalancingKMSClientProvider.java
index f46da1f3186..f9cc3f4524f 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/kms/LoadBalancingKMSClientProvider.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/DefaultCodec.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/DefaultCodec.java
index d2ffb22eaaf..b407ddb1104 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/DefaultCodec.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/codec/ErasureCodec.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/codec/ErasureCodec.java
index c75eaead83d..22ab632a495 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/codec/ErasureCodec.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/AsyncCallHandler.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/AsyncCallHandler.java
index 3ebbcd912dc..60210ccd920 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/AsyncCallHandler.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/RetryPolicies.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/RetryPolicies.java
index 0b66347f1f9..d7693f868eb 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/RetryPolicies.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/IdMappingServiceProvider.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/IdMappingServiceProvider.java
index 86edab7de70..08cacdc248f 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/IdMappingServiceProvider.java
+++ b/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,
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/http/CrossOriginFilter.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/http/CrossOriginFilter.java
index 059cdc4b653..ef342f257a9 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/http/CrossOriginFilter.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/ssl/ReloadingX509TrustManager.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/ssl/ReloadingX509TrustManager.java
index c6049a91b5a..3dc5017ba63 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/ssl/ReloadingX509TrustManager.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/HttpUserGroupInformation.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/HttpUserGroupInformation.java
index 614c0d3b36b..1f18b1c2f6a 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/HttpUserGroupInformation.java
+++ b/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.
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/FindClass.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/FindClass.java
index e51f7b14a60..268b4e166e8 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/FindClass.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ReflectionUtils.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ReflectionUtils.java
index 2438b714ffc..155c4f9c5f4 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ReflectionUtils.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/cli/util/CommandExecutor.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/cli/util/CommandExecutor.java
index 5ef129cdc87..2ccfcfebb27 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/cli/util/CommandExecutor.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestCommonConfigurationFields.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestCommonConfigurationFields.java
index 9d9a43da2dd..c31229ba9fc 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestCommonConfigurationFields.java
+++ b/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;
/**
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestConfigurationDeprecation.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestConfigurationDeprecation.java
index 2c0d6025f26..83837862ac4 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestConfigurationDeprecation.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/crypto/TestCryptoStreamsForLocalFS.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/crypto/TestCryptoStreamsForLocalFS.java
index 8453889b53a..072baf188de 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/crypto/TestCryptoStreamsForLocalFS.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/crypto/random/TestOsSecureRandom.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/crypto/random/TestOsSecureRandom.java
index 2ea45231a13..6448a9a2fba 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/crypto/random/TestOsSecureRandom.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/AbstractContractDeleteTest.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/AbstractContractDeleteTest.java
index 08df1d4d883..605ea45649a 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/AbstractContractDeleteTest.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/ftp/FTPContract.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/ftp/FTPContract.java
index 1efd7fc4e95..62648ec58bc 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/ftp/FTPContract.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/rawlocal/TestRawLocalContractUnderlyingFileBehavior.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/rawlocal/TestRawLocalContractUnderlyingFileBehavior.java
index 2cb5414caa4..6eb24985f4f 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/rawlocal/TestRawLocalContractUnderlyingFileBehavior.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/rawlocal/TestRawlocalContractPathHandle.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/rawlocal/TestRawlocalContractPathHandle.java
index 3c088d278e5..c34269708dd 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/rawlocal/TestRawlocalContractPathHandle.java
+++ b/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
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/TestPathData.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/TestPathData.java
index 921fc18131a..130ee5edee7 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/TestPathData.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/TestTextCommand.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/TestTextCommand.java
index c99b97e6e40..4eb1d433bee 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/shell/TestTextCommand.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFileSystemWithAuthorityLocalFileSystem.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFileSystemWithAuthorityLocalFileSystem.java
index 9223338f34b..f2452279bc7 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/viewfs/TestViewFileSystemWithAuthorityLocalFileSystem.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/viewfs/ViewFileSystemTestSetup.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/viewfs/ViewFileSystemTestSetup.java
index 866c03ecda9..5713f532be7 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/viewfs/ViewFileSystemTestSetup.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/TestHttpServerLifecycle.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/TestHttpServerLifecycle.java
index 757ea0c05e7..4ae1190abd5 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/TestHttpServerLifecycle.java
+++ b/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 {
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/TestCodec.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/TestCodec.java
index 0bda66741ba..5a63c06515e 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/TestCodec.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/bzip2/TestBzip2CompressorDecompressor.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/bzip2/TestBzip2CompressorDecompressor.java
index c585a463e46..fae5ce6de40 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/bzip2/TestBzip2CompressorDecompressor.java
+++ b/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 {
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java
index ac9ea5e8a84..25da4fe2375 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/file/tfile/TestCompression.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/file/tfile/TestCompression.java
index b1bf0774974..6b4c6985513 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/file/tfile/TestCompression.java
+++ b/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 {
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/MiniRPCBenchmark.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/MiniRPCBenchmark.java
index 2290270bfba..70ae6390914 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/MiniRPCBenchmark.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestDNS.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestDNS.java
index 0e1ac1deb96..2504a6401a8 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestDNS.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestTableMapping.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestTableMapping.java
index 86870e12571..697b0bad437 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestTableMapping.java
+++ b/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 {
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestKDiagNoKDC.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestKDiagNoKDC.java
index 2e266bba1f9..03d953b5f3c 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestKDiagNoKDC.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUGIWithMiniKdc.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUGIWithMiniKdc.java
index de74d178636..f04fbe1e089 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUGIWithMiniKdc.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/http/TestCrossOriginFilter.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/http/TestCrossOriginFilter.java
index b9662b8c6a3..0b396be48f9 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/http/TestCrossOriginFilter.java
+++ b/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
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/service/launcher/TestServiceLauncher.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/service/launcher/TestServiceLauncher.java
index f40051b0d17..72757e4b1c1 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/service/launcher/TestServiceLauncher.java
+++ b/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.*;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/service/launcher/testservices/NoArgsAllowedService.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/service/launcher/testservices/NoArgsAllowedService.java
index 602cb157ed5..9245b1844f7 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/service/launcher/testservices/NoArgsAllowedService.java
+++ b/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.
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/test/TestTimedOutTestsListener.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/test/TestTimedOutTestsListener.java
index 1334f1c95f4..42ed8c87755 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/test/TestTimedOutTestsListener.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/tools/TestCommandShell.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/tools/TestCommandShell.java
index 606791801fe..e9c5950b729 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/tools/TestCommandShell.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestDiskCheckerWithDiskIo.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestDiskCheckerWithDiskIo.java
index 082672ccd33..552d1319312 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestDiskCheckerWithDiskIo.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestShell.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestShell.java
index 68e70ebb79a..9ae52ff95cb 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestShell.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/FSINFO3Response.java b/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/FSINFO3Response.java
index ebd54fe08cd..4ec4cec6107 100644
--- a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/FSINFO3Response.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/FSSTAT3Response.java b/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/FSSTAT3Response.java
index c0d1a8a38ef..bcc95861a96 100644
--- a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/FSSTAT3Response.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/LINK3Response.java b/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/LINK3Response.java
index 3893aa10b2f..c810030c261 100644
--- a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/LINK3Response.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/READDIR3Response.java b/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/READDIR3Response.java
index 5802b7544e6..f47acce57f4 100644
--- a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/READDIR3Response.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/READDIRPLUS3Response.java b/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/READDIRPLUS3Response.java
index f1bfd56fd39..cc27397d77c 100644
--- a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/READDIRPLUS3Response.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/REMOVE3Response.java b/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/REMOVE3Response.java
index f0fcb3d705c..a0b51111a63 100644
--- a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/REMOVE3Response.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/WRITE3Response.java b/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/WRITE3Response.java
index 8d4b4d909f6..3f2552a8eca 100644
--- a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/response/WRITE3Response.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/oncrpc/SimpleTcpClientHandler.java b/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/oncrpc/SimpleTcpClientHandler.java
index 1acefc857f8..163e26b823d 100644
--- a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/oncrpc/SimpleTcpClientHandler.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/oncrpc/security/SysSecurityHandler.java b/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/oncrpc/security/SysSecurityHandler.java
index 884bebc9756..1ca4dbe2cca 100644
--- a/hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/oncrpc/security/SysSecurityHandler.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/binding/RegistryPathUtils.java b/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/binding/RegistryPathUtils.java
index 9fa4b8d84d8..b0b30bdea5f 100644
--- a/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/binding/RegistryPathUtils.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/binding/RegistryUtils.java b/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/binding/RegistryUtils.java
index cff70a61378..f451792355c 100644
--- a/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/binding/RegistryUtils.java
+++ b/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;
/**
diff --git a/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/impl/zk/RegistryOperationsService.java b/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/impl/zk/RegistryOperationsService.java
index 49ea16bba7d..96cf911fd95 100644
--- a/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/impl/zk/RegistryOperationsService.java
+++ b/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;
diff --git a/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/impl/zk/RegistrySecurity.java b/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/impl/zk/RegistrySecurity.java
index bcca604182b..e500ba6617b 100644
--- a/hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/client/impl/zk/RegistrySecurity.java
+++ b/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;
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