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aajisaka pushed a commit to branch branch-3.3
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The following commit(s) were added to refs/heads/branch-3.3 by this push:
new bdef321d52f HDFS-16576. Remove unused imports in HDFS project (#4389)
bdef321d52f is described below
commit bdef321d52f2b69e4732ac5b5dde5895b767a7a6
Author: Ashutosh Gupta <ashutosh.gu...@st.niituniversity.in>
AuthorDate: Thu Jun 9 14:39:00 2022 +0100
HDFS-16576. Remove unused imports in HDFS project (#4389)
Co-authored-by: Ashutosh Gupta <ashu...@amazon.com>
Reviewed-by: Tao Li <toms...@apache.org>
Signed-off-by: Akira Ajisaka <aajis...@apache.org>
(cherry picked from commit 6e11c941703d001d216733a01569a5bc83c348c9)
Conflicts:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/checker/AbstractFuture.java
---
.../src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java | 2 --
.../hdfs/server/namenode/ha/TestConfiguredFailoverProxyProvider.java | 1 -
.../main/java/org/apache/hadoop/fs/http/client/HttpFSFileSystem.java | 1 -
.../hadoop/fs/http/client/TestHttpFSFileSystemLocalFileSystem.java | 2 --
.../org/apache/hadoop/fs/http/server/TestHttpFSAccessControlled.java | 1 -
.../src/test/java/org/apache/hadoop/lib/server/TestServer.java | 1 -
.../main/java/org/apache/hadoop/hdfs/nfs/nfs3/Nfs3HttpServer.java | 1 -
.../src/test/java/org/apache/hadoop/hdfs/nfs/nfs3/TestNfs3Utils.java | 2 --
.../federation/router/TestRouterRpcStoragePolicySatisfier.java | 1 -
.../src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotInfo.java | 1 -
.../apache/hadoop/hdfs/server/common/IncorrectVersionException.java | 1 -
.../server/common/blockaliasmap/impl/TextFileRegionAliasMap.java | 1 -
.../apache/hadoop/hdfs/server/datanode/checker/AbstractFuture.java | 1 -
.../org/apache/hadoop/hdfs/server/namenode/AclEntryStatusFormat.java | 2 --
.../java/org/apache/hadoop/hdfs/server/namenode/SerialNumberMap.java | 1 -
.../apache/hadoop/hdfs/server/namenode/ha/RemoteNameNodeInfo.java | 1 -
.../hadoop/hdfs/server/namenode/startupprogress/package-info.java | 1 -
.../org/apache/hadoop/hdfs/tools/snapshot/LsSnapshottableDir.java | 1 -
.../src/test/java/org/apache/hadoop/TestGenericRefresh.java | 2 --
.../src/test/java/org/apache/hadoop/fs/TestResolveHdfsSymlink.java | 1 -
.../org/apache/hadoop/fs/TestSWebHdfsFileContextMainOperations.java | 1 -
.../test/java/org/apache/hadoop/fs/TestSymlinkHdfsFileSystem.java | 1 -
.../src/test/java/org/apache/hadoop/hdfs/TestFileAppend3.java | 1 -
.../src/test/java/org/apache/hadoop/hdfs/TestHDFSPolicyProvider.java | 2 --
.../src/test/java/org/apache/hadoop/hdfs/TestModTime.java | 2 --
.../java/org/apache/hadoop/hdfs/TestRollingUpgradeDowngrade.java | 1 -
.../src/test/java/org/apache/hadoop/hdfs/TestSeekBug.java | 1 -
.../src/test/java/org/apache/hadoop/hdfs/TestSetTimes.java | 1 -
.../src/test/java/org/apache/hadoop/hdfs/TestSnapshotCommands.java | 2 +-
.../apache/hadoop/hdfs/server/datanode/TestDataNodeInitStorage.java | 4 ----
.../hdfs/server/datanode/fsdataset/impl/TestDatanodeRestart.java | 5 -----
.../hadoop/hdfs/server/namenode/TestBlockUnderConstruction.java | 3 ---
.../hdfs/server/namenode/TestCommitBlockWithInvalidGenStamp.java | 2 --
.../org/apache/hadoop/hdfs/server/namenode/TestFileContextXAttr.java | 2 --
.../java/org/apache/hadoop/hdfs/server/namenode/TestFileLimit.java | 1 -
.../hadoop/hdfs/server/namenode/TestFsckWithMultipleNameNodes.java | 1 -
.../org/apache/hadoop/hdfs/server/namenode/TestSecondaryWebUi.java | 2 --
.../org/apache/hadoop/hdfs/server/namenode/TestSecureNameNode.java | 1 -
.../hdfs/server/namenode/TestSecureNameNodeWithExternalKdc.java | 1 -
.../hadoop/hdfs/server/namenode/snapshot/TestXAttrWithSnapshot.java | 1 -
.../server/namenode/startupprogress/TestStartupProgressMetrics.java | 2 --
.../org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitCache.java | 1 -
.../hdfs/tools/offlineImageViewer/TestOfflineImageViewerForAcl.java | 4 ----
.../src/test/java/org/apache/hadoop/tools/TestJMXGet.java | 4 ----
44 files changed, 1 insertion(+), 70 deletions(-)
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
index df70451dd4a..99d99a8a52c 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java
@@ -139,8 +139,6 @@ import
org.apache.hadoop.thirdparty.com.google.common.base.Charsets;
import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions;
import org.apache.hadoop.thirdparty.com.google.common.collect.Lists;
-import static
org.apache.hadoop.fs.impl.PathCapabilitiesSupport.validatePathCapabilityArgs;
-
/** A FileSystem for HDFS over the web. */
public class WebHdfsFileSystem extends FileSystem
implements DelegationTokenRenewer.Renewable,
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-client/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestConfiguredFailoverProxyProvider.java
b/hadoop-hdfs-project/hadoop-hdfs-client/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestConfiguredFailoverProxyProvider.java
index f28bfa65b59..c198536d01a 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-client/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestConfiguredFailoverProxyProvider.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-client/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestConfiguredFailoverProxyProvider.java
@@ -35,7 +35,6 @@ import org.mockito.stubbing.Answer;
import org.slf4j.event.Level;
import java.io.IOException;
-import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.URI;
import java.net.URISyntaxException;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/client/HttpFSFileSystem.java
b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/client/HttpFSFileSystem.java
index e13f44e7740..b427d8c35da 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/client/HttpFSFileSystem.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/client/HttpFSFileSystem.java
@@ -91,7 +91,6 @@ import java.net.URL;
import java.security.PrivilegedExceptionAction;
import java.text.MessageFormat;
import java.util.HashMap;
-import java.util.Locale;
import java.util.Map;
import static
org.apache.hadoop.fs.impl.PathCapabilitiesSupport.validatePathCapabilityArgs;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/client/TestHttpFSFileSystemLocalFileSystem.java
b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/client/TestHttpFSFileSystemLocalFileSystem.java
index 83bcb2efacc..955529ef981 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/client/TestHttpFSFileSystemLocalFileSystem.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/client/TestHttpFSFileSystemLocalFileSystem.java
@@ -32,8 +32,6 @@ import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import java.io.File;
-import java.net.URI;
-import java.net.URISyntaxException;
@RunWith(value = Parameterized.class)
public class TestHttpFSFileSystemLocalFileSystem extends BaseTestHttpFSWith {
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/server/TestHttpFSAccessControlled.java
b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/server/TestHttpFSAccessControlled.java
index 47d99352de1..d3a4f59750f 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/server/TestHttpFSAccessControlled.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/server/TestHttpFSAccessControlled.java
@@ -21,7 +21,6 @@ import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.test.HTestCase;
import org.apache.hadoop.test.HadoopUsersConfTestHelper;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/lib/server/TestServer.java
b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/lib/server/TestServer.java
index a6a139f23e1..ff1d1ca0ad5 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/lib/server/TestServer.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/lib/server/TestServer.java
@@ -42,7 +42,6 @@ import org.apache.hadoop.test.HTestCase;
import org.apache.hadoop.test.TestDir;
import org.apache.hadoop.test.TestDirHelper;
import org.apache.hadoop.test.TestException;
-import org.apache.hadoop.util.Shell;
import org.apache.hadoop.util.StringUtils;
import org.junit.Test;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/Nfs3HttpServer.java
b/hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/Nfs3HttpServer.java
index c37a21e7d83..ad410d4d388 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/Nfs3HttpServer.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/Nfs3HttpServer.java
@@ -25,7 +25,6 @@ import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.nfs.conf.NfsConfigKeys;
import org.apache.hadoop.hdfs.nfs.conf.NfsConfiguration;
-import org.apache.hadoop.hdfs.server.common.JspHelper;
import org.apache.hadoop.http.HttpConfig;
import org.apache.hadoop.http.HttpServer2;
import org.apache.hadoop.net.NetUtils;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-nfs/src/test/java/org/apache/hadoop/hdfs/nfs/nfs3/TestNfs3Utils.java
b/hadoop-hdfs-project/hadoop-hdfs-nfs/src/test/java/org/apache/hadoop/hdfs/nfs/nfs3/TestNfs3Utils.java
index 77646af2c5e..8380c3c9bb3 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-nfs/src/test/java/org/apache/hadoop/hdfs/nfs/nfs3/TestNfs3Utils.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-nfs/src/test/java/org/apache/hadoop/hdfs/nfs/nfs3/TestNfs3Utils.java
@@ -18,8 +18,6 @@
package org.apache.hadoop.hdfs.nfs.nfs3;
import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
import org.junit.Test;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterRpcStoragePolicySatisfier.java
b/hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterRpcStoragePolicySatisfier.java
index fa1079a4ede..57518c81119 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterRpcStoragePolicySatisfier.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterRpcStoragePolicySatisfier.java
@@ -31,7 +31,6 @@ import
org.apache.hadoop.hdfs.server.balancer.NameNodeConnector;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
import org.apache.hadoop.hdfs.server.federation.MiniRouterDFSCluster;
import org.apache.hadoop.hdfs.server.federation.RouterConfigBuilder;
-import org.apache.hadoop.hdfs.server.federation.metrics.NamenodeBeanMetrics;
import org.apache.hadoop.hdfs.server.namenode.sps.Context;
import org.apache.hadoop.hdfs.server.namenode.sps.StoragePolicySatisfier;
import org.apache.hadoop.hdfs.server.sps.ExternalSPSContext;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotInfo.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotInfo.java
index 676e8276f25..03a2ec7322d 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotInfo.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotInfo.java
@@ -20,7 +20,6 @@ package org.apache.hadoop.hdfs.protocol;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.protocol.proto.AclProtos.FsPermissionProto;
-import org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot;
/**
* SnapshotInfo maintains information for a snapshot
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/IncorrectVersionException.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/IncorrectVersionException.java
index 43b8c3c05d1..7a14e38f550 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/IncorrectVersionException.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/IncorrectVersionException.java
@@ -21,7 +21,6 @@ import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
/**
* The exception is thrown when external version does not match
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/blockaliasmap/impl/TextFileRegionAliasMap.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/blockaliasmap/impl/TextFileRegionAliasMap.java
index 41b5d33785c..0ca7118b0d3 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/blockaliasmap/impl/TextFileRegionAliasMap.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/blockaliasmap/impl/TextFileRegionAliasMap.java
@@ -26,7 +26,6 @@ import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
-import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Base64;
import java.util.Iterator;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/checker/AbstractFuture.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/checker/AbstractFuture.java
index 6ae4f01299c..cdbba6ef142 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/checker/AbstractFuture.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/checker/AbstractFuture.java
@@ -29,7 +29,6 @@ import
org.apache.hadoop.thirdparty.com.google.common.util.concurrent.ListeningE
import
org.apache.hadoop.thirdparty.com.google.common.util.concurrent.ListenableFuture;
import
org.apache.hadoop.thirdparty.com.google.common.util.concurrent.SettableFuture;
import
org.apache.hadoop.thirdparty.com.google.common.util.concurrent.Uninterruptibles;
-import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import static java.util.concurrent.atomic.AtomicReferenceFieldUpdater
.newUpdater;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/AclEntryStatusFormat.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/AclEntryStatusFormat.java
index a610aee4849..a6e7d00f848 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/AclEntryStatusFormat.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/AclEntryStatusFormat.java
@@ -26,8 +26,6 @@ import org.apache.hadoop.fs.permission.AclEntryType;
import org.apache.hadoop.fs.permission.FsAction;
import org.apache.hadoop.hdfs.util.LongBitFormat;
-import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableList;
-
/**
* Class to pack an AclEntry into an integer. <br>
* An ACL entry is represented by a 32-bit integer in Big Endian format. <br>
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/SerialNumberMap.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/SerialNumberMap.java
index ee6b8eb80ce..d9a41428b55 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/SerialNumberMap.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/SerialNumberMap.java
@@ -18,7 +18,6 @@
package org.apache.hadoop.hdfs.server.namenode;
import java.util.HashSet;
-import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RemoteNameNodeInfo.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RemoteNameNodeInfo.java
index 1ff251d808c..3db43f01288 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RemoteNameNodeInfo.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RemoteNameNodeInfo.java
@@ -24,7 +24,6 @@ import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
-import org.apache.hadoop.thirdparty.com.google.common.base.Objects;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.HAUtil;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/startupprogress/package-info.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/startupprogress/package-info.java
index e6a8b97fb3f..d7d7b3d754d 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/startupprogress/package-info.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/startupprogress/package-info.java
@@ -40,4 +40,3 @@
package org.apache.hadoop.hdfs.server.namenode.startupprogress;
import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.hdfs.server.namenode.NameNode;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/snapshot/LsSnapshottableDir.java
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/snapshot/LsSnapshottableDir.java
index 2f030b4734c..640065bb5c6 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/snapshot/LsSnapshottableDir.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/snapshot/LsSnapshottableDir.java
@@ -20,7 +20,6 @@ package org.apache.hadoop.hdfs.tools.snapshot;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hdfs.DistributedFileSystem;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/TestGenericRefresh.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/TestGenericRefresh.java
index dcd91c7d848..70f9af98417 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/TestGenericRefresh.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/TestGenericRefresh.java
@@ -19,9 +19,7 @@
package org.apache.hadoop;
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.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestResolveHdfsSymlink.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestResolveHdfsSymlink.java
index 05060af4a90..aefb4835b14 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestResolveHdfsSymlink.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestResolveHdfsSymlink.java
@@ -37,7 +37,6 @@ import
org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifie
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.token.Token;
import
org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier;
-import org.apache.hadoop.test.PathUtils;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.AfterClass;
import org.junit.Assert;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestSWebHdfsFileContextMainOperations.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestSWebHdfsFileContextMainOperations.java
index 84bd98bf67c..061858c3d28 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestSWebHdfsFileContextMainOperations.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestSWebHdfsFileContextMainOperations.java
@@ -17,7 +17,6 @@
*/
package org.apache.hadoop.fs;
-import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestSymlinkHdfsFileSystem.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestSymlinkHdfsFileSystem.java
index fba9c42858d..cd0155389c0 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestSymlinkHdfsFileSystem.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/fs/TestSymlinkHdfsFileSystem.java
@@ -17,7 +17,6 @@
*/
package org.apache.hadoop.fs;
-import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend3.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend3.java
index 6cb63a24306..6bf24dd2372 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend3.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend3.java
@@ -26,7 +26,6 @@ import java.util.EnumSet;
import java.util.List;
import org.apache.hadoop.fs.CreateFlag;
-import
org.apache.hadoop.hdfs.server.datanode.FsDatasetTestUtils.MaterializedReplica;
import org.apache.hadoop.test.GenericTestUtils;
import org.mockito.invocation.InvocationOnMock;
import static org.mockito.Mockito.spy;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestHDFSPolicyProvider.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestHDFSPolicyProvider.java
index bc763d42fd4..b56bc2b26d0 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestHDFSPolicyProvider.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestHDFSPolicyProvider.java
@@ -19,9 +19,7 @@ package org.apache.hadoop.hdfs;
import static org.junit.Assert.*;
-import java.util.ArrayList;
import java.util.Arrays;
-import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestModTime.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestModTime.java
index 3978444c6a2..0b73157e718 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestModTime.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestModTime.java
@@ -26,8 +26,6 @@ import java.net.InetSocketAddress;
import java.util.Random;
import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.CommonConfigurationKeys;
-import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestRollingUpgradeDowngrade.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestRollingUpgradeDowngrade.java
index 189b5f575a4..ff17c2f6174 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestRollingUpgradeDowngrade.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestRollingUpgradeDowngrade.java
@@ -28,7 +28,6 @@ import
org.apache.hadoop.hdfs.protocol.HdfsConstants.RollingUpgradeAction;
import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
import org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo;
import org.apache.hadoop.hdfs.qjournal.MiniQJMHACluster;
-import org.apache.hadoop.hdfs.server.common.IncorrectVersionException;
import org.apache.hadoop.hdfs.server.namenode.NNStorage;
import org.apache.hadoop.hdfs.server.namenode.NameNodeLayoutVersion;
import org.junit.Assert;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSeekBug.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSeekBug.java
index 9dd2987f55f..c7a7e7a8d11 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSeekBug.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSeekBug.java
@@ -20,7 +20,6 @@ package org.apache.hadoop.hdfs;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
-import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Random;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSetTimes.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSetTimes.java
index 74cde2a2a95..7039a6ba692 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSetTimes.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSetTimes.java
@@ -42,7 +42,6 @@ import org.apache.hadoop.test.MockitoUtil;
import org.apache.hadoop.util.Time;
import org.junit.Assert;
import org.junit.Test;
-import org.mockito.Mockito;
/**
* This class tests the access time on files.
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSnapshotCommands.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSnapshotCommands.java
index 2b5a69d0d58..07523fd3fa0 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSnapshotCommands.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSnapshotCommands.java
@@ -25,7 +25,7 @@ import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
import org.apache.hadoop.hdfs.tools.snapshot.SnapshotDiff;
-import org.apache.hadoop.util.ChunkedArrayList;
+
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeInitStorage.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeInitStorage.java
index df8be222069..9d6958ea2ab 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeInitStorage.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeInitStorage.java
@@ -29,10 +29,6 @@ import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
import org.junit.Test;
-import static org.hamcrest.core.IsNot.not;
-import static org.junit.Assert.*;
-
-
/**
* Test to verify that the DataNode Uuid is correctly initialized before
* FsDataSet initialization.
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestDatanodeRestart.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestDatanodeRestart.java
index 0afee5fa57f..ac9587e54f7 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestDatanodeRestart.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestDatanodeRestart.java
@@ -18,12 +18,8 @@
package org.apache.hadoop.hdfs.server.datanode.fsdataset.impl;
import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
-import java.util.Collection;
-import java.util.Iterator;
import java.util.Random;
import org.apache.hadoop.conf.Configuration;
@@ -40,7 +36,6 @@ import
org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState;
import org.apache.hadoop.hdfs.server.datanode.DataNode;
import org.apache.hadoop.hdfs.server.datanode.DataNodeFaultInjector;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
-import org.apache.hadoop.hdfs.server.datanode.DatanodeUtil;
import org.apache.hadoop.hdfs.server.datanode.ReplicaInfo;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestBlockUnderConstruction.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestBlockUnderConstruction.java
index 49e79da674e..cab87e014a7 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestBlockUnderConstruction.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestBlockUnderConstruction.java
@@ -45,9 +45,6 @@ import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
-import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.LocatedBlockProto;
-import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
-
public class TestBlockUnderConstruction {
static final String BASE_DIR = "/test/TestBlockUnderConstruction";
static final int BLOCK_SIZE = 8192; // same as TestFileCreation.blocksize
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCommitBlockWithInvalidGenStamp.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCommitBlockWithInvalidGenStamp.java
index f7b1ea5bac3..d57e00ef396 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCommitBlockWithInvalidGenStamp.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCommitBlockWithInvalidGenStamp.java
@@ -20,14 +20,12 @@ package org.apache.hadoop.hdfs.server.namenode;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.io.IOUtils;
import org.junit.After;
import org.junit.Assert;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFileContextXAttr.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFileContextXAttr.java
index da09298b777..3ae6f4f7bac 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFileContextXAttr.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFileContextXAttr.java
@@ -29,9 +29,7 @@ import org.apache.hadoop.fs.FileContext;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.XAttrSetFlag;
-import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DistributedFileSystem;
-import org.junit.BeforeClass;
/**
* Tests of XAttr operations using FileContext APIs.
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFileLimit.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFileLimit.java
index 636dc6059f1..7420f440eea 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFileLimit.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFileLimit.java
@@ -30,7 +30,6 @@ import org.apache.hadoop.hdfs.HdfsConfiguration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
-import org.apache.hadoop.ipc.RemoteException;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.Test;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFsckWithMultipleNameNodes.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFsckWithMultipleNameNodes.java
index e414296796d..71719a58107 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFsckWithMultipleNameNodes.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFsckWithMultipleNameNodes.java
@@ -28,7 +28,6 @@ import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.viewfs.ConfigUtil;
-import org.apache.hadoop.fs.viewfs.ViewFileSystem;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.HdfsConfiguration;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecondaryWebUi.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecondaryWebUi.java
index 9473cb3ed95..1d3187dffe0 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecondaryWebUi.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecondaryWebUi.java
@@ -21,7 +21,6 @@ import static
org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_CHECKPOINT_TXNS_
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
-import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.junit.AfterClass;
import org.junit.Assert;
@@ -31,7 +30,6 @@ import org.junit.Test;
import javax.management.*;
import java.io.IOException;
import java.lang.management.ManagementFactory;
-import java.net.URL;
public class TestSecondaryWebUi {
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecureNameNode.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecureNameNode.java
index c90a91c67d4..e67e5cf720c 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecureNameNode.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecureNameNode.java
@@ -19,7 +19,6 @@ package org.apache.hadoop.hdfs.server.namenode;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.fail;
import java.io.IOException;
import java.lang.management.ManagementFactory;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecureNameNodeWithExternalKdc.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecureNameNodeWithExternalKdc.java
index d36b9c997e2..60601a6ab91 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecureNameNodeWithExternalKdc.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestSecureNameNodeWithExternalKdc.java
@@ -19,7 +19,6 @@ package org.apache.hadoop.hdfs.server.namenode;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.IOException;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestXAttrWithSnapshot.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestXAttrWithSnapshot.java
index badff682124..03931d6c663 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestXAttrWithSnapshot.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/snapshot/TestXAttrWithSnapshot.java
@@ -34,7 +34,6 @@ import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
-import org.apache.hadoop.hdfs.protocol.NSQuotaExceededException;
import org.apache.hadoop.hdfs.protocol.SnapshotAccessControlException;
import org.apache.hadoop.hdfs.protocol.SnapshotDiffReport;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/startupprogress/TestStartupProgressMetrics.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/startupprogress/TestStartupProgressMetrics.java
index 4fe3d15c4a8..ef2004f6eb6 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/startupprogress/TestStartupProgressMetrics.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/startupprogress/TestStartupProgressMetrics.java
@@ -17,9 +17,7 @@
*/
package org.apache.hadoop.hdfs.server.namenode.startupprogress;
-import static org.apache.hadoop.hdfs.server.namenode.startupprogress.Phase.*;
import static
org.apache.hadoop.hdfs.server.namenode.startupprogress.StartupProgressTestHelper.*;
-import static
org.apache.hadoop.hdfs.server.namenode.startupprogress.StepType.*;
import static org.apache.hadoop.test.MetricsAsserts.*;
import static org.junit.Assert.*;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitCache.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitCache.java
index 3d124ab7a48..f9bcb33154c 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitCache.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitCache.java
@@ -21,7 +21,6 @@ import static
org.apache.hadoop.hdfs.DFSConfigKeys.DFS_BLOCK_SIZE_KEY;
import static
org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_CLIENT_CONTEXT;
import static
org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_CLIENT_DOMAIN_SOCKET_DATA_TRAFFIC;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DOMAIN_SOCKET_PATH_KEY;
-import static
org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_CLIENT_SOCKET_TIMEOUT_KEY;
import static org.hamcrest.CoreMatchers.equalTo;
import java.io.DataOutputStream;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/TestOfflineImageViewerForAcl.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/TestOfflineImageViewerForAcl.java
index b41ec9690ce..ec191587227 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/TestOfflineImageViewerForAcl.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/TestOfflineImageViewerForAcl.java
@@ -21,7 +21,6 @@ import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
-import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
@@ -29,11 +28,9 @@ import java.io.RandomAccessFile;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.URI;
-import java.net.URISyntaxException;
import java.net.URL;
import java.util.HashMap;
-import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
@@ -55,7 +52,6 @@ import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.xml.sax.InputSource;
-import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import static org.apache.hadoop.fs.permission.AclEntryScope.ACCESS;
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestJMXGet.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestJMXGet.java
index 2fe6102dee1..acd29655071 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestJMXGet.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestJMXGet.java
@@ -29,7 +29,6 @@ import java.io.PipedInputStream;
import java.io.PipedOutputStream;
import java.io.PrintStream;
import java.lang.management.ManagementFactory;
-import java.util.Random;
import java.util.Set;
import java.util.concurrent.TimeoutException;
@@ -37,9 +36,6 @@ import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.CommonConfigurationKeys;
-import org.apache.hadoop.fs.FSDataOutputStream;
-import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSTestUtil;
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