HBASE-22231 Removed unused and '*' import

hbase-client/src/main/java/org/apache/hadoop/hbase/client/ClientAsyncPrefetchScanner.java

@@ -27,7 +27,6 @@ import java.util.Queue;
 import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.LinkedBlockingQueue;
-import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.concurrent.locks.Condition;
 import java.util.concurrent.locks.Lock;

hbase-client/src/main/java/org/apache/hadoop/hbase/client/ImmutableHTableDescriptor.java

@@ -18,11 +18,10 @@
  */
 package org.apache.hadoop.hbase.client;
 
-import org.apache.yetus.audience.InterfaceAudience;
-import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder.ModifyableColumnFamilyDescriptor;
-import org.apache.hadoop.hbase.client.TableDescriptorBuilder.ModifyableTableDescriptor;
 import org.apache.hadoop.hbase.HColumnDescriptor;
 import org.apache.hadoop.hbase.HTableDescriptor;
+import org.apache.hadoop.hbase.client.TableDescriptorBuilder.ModifyableTableDescriptor;
+import org.apache.yetus.audience.InterfaceAudience;
 
 /**
  * Read-only table descriptor.

hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/CoprocessorRpcUtils.java

@@ -30,7 +30,6 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.apache.hadoop.hbase.exceptions.UnknownProtocolException;
 import org.apache.hadoop.hbase.protobuf.generated.ClientProtos;
-import org.apache.hbase.thirdparty.com.google.protobuf.UnsafeByteOperations;
 import org.apache.hadoop.hbase.shaded.protobuf.RequestConverter;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.CoprocessorServiceCall;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.CoprocessorServiceRequest;

hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/FailedServers.java

@@ -19,8 +19,6 @@ package org.apache.hadoop.hbase.ipc;
 
 import java.net.InetSocketAddress;
 import java.util.HashMap;
-import java.util.Iterator;
-import java.util.LinkedList;
 import java.util.Map;
 
 import org.apache.hadoop.conf.Configuration;
@@ -28,7 +26,6 @@ import org.apache.yetus.audience.InterfaceAudience;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
-import org.apache.hadoop.hbase.util.Pair;
 
 /**
  * A class to manage a list of servers that failed recently.

hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/RemoteWithExtrasException.java

@@ -25,10 +25,9 @@ import java.security.PrivilegedAction;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.DoNotRetryIOException;
 import org.apache.hadoop.hbase.HBaseConfiguration;
-import org.apache.yetus.audience.InterfaceAudience;
-import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
 import org.apache.hadoop.hbase.util.DynamicClassLoader;
 import org.apache.hadoop.ipc.RemoteException;
+import org.apache.yetus.audience.InterfaceAudience;
 
 /**
  * A {@link RemoteException} with some extra information.  If source exception

hbase-client/src/main/java/org/apache/hadoop/hbase/quotas/QuotaRetriever.java

@@ -26,7 +26,6 @@ import java.util.Objects;
 import java.util.Queue;
 
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hbase.TableName;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -36,7 +35,6 @@ import org.apache.hadoop.hbase.client.Result;
 import org.apache.hadoop.hbase.client.ResultScanner;
 import org.apache.hadoop.hbase.client.Scan;
 import org.apache.hadoop.hbase.client.Table;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.QuotaProtos.Quotas;
 import org.apache.hadoop.util.StringUtils;
 
 /**

hbase-client/src/main/java/org/apache/hadoop/hbase/security/EncryptionUtil.java

@@ -29,7 +29,6 @@ import javax.crypto.spec.SecretKeySpec;
 
 import org.apache.commons.crypto.cipher.CryptoCipherFactory;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hbase.HColumnDescriptor;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.yetus.audience.InterfaceStability;

hbase-client/src/main/java/org/apache/hadoop/hbase/shaded/protobuf/ProtobufUtil.java

@@ -42,7 +42,6 @@ import java.util.function.Function;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
-import org.apache.commons.io.input.BoundedInputStream;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hbase.ByteBufferExtendedCell;

hbase-client/src/main/java/org/apache/hadoop/hbase/snapshot/ClientSnapshotDescriptionUtils.java

@@ -21,7 +21,6 @@ package org.apache.hadoop.hbase.snapshot;
 
 import org.apache.hadoop.hbase.TableName;
 import org.apache.yetus.audience.InterfaceAudience;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.SnapshotProtos;
 import org.apache.hadoop.hbase.util.Bytes;
 

hbase-client/src/test/java/org/apache/hadoop/hbase/client/TestReversedScannerCallable.java

@@ -19,7 +19,6 @@ package org.apache.hadoop.hbase.client;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
-import org.apache.hadoop.hbase.HRegionInfo;
 import org.apache.hadoop.hbase.HRegionLocation;
 import org.apache.hadoop.hbase.RegionLocations;
 import org.apache.hadoop.hbase.ServerName;

hbase-client/src/test/java/org/apache/hadoop/hbase/filter/TestComparators.java

@@ -23,7 +23,6 @@ import static org.junit.Assert.assertTrue;
 import java.nio.ByteBuffer;
 import org.apache.hadoop.hbase.ByteBufferKeyValue;
 import org.apache.hadoop.hbase.Cell;
-import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.KeyValue;
 import org.apache.hadoop.hbase.PrivateCellUtil;

hbase-common/src/test/java/org/apache/hadoop/hbase/HBaseClassTestRuleChecker.java

@@ -22,7 +22,6 @@ import static org.junit.Assert.fail;
 
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
-import java.util.concurrent.TimeUnit;
 
 import org.apache.hadoop.hbase.testclassification.IntegrationTests;
 import org.apache.yetus.audience.InterfaceAudience;

hbase-common/src/test/java/org/apache/hadoop/hbase/TestTimeout.java

@@ -18,7 +18,6 @@
 package org.apache.hadoop.hbase;
 
 import org.apache.hadoop.hbase.testclassification.SmallTests;
-import org.apache.hadoop.hbase.util.Threads;
 import org.junit.ClassRule;
 import org.junit.Ignore;
 import org.junit.Test;

hbase-common/src/test/java/org/apache/hadoop/hbase/net/TestAddress.java

@@ -21,7 +21,6 @@ package org.apache.hadoop.hbase.net;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.testclassification.MiscTests;
 import org.apache.hadoop.hbase.testclassification.SmallTests;
-import org.junit.Assert;
 import org.junit.ClassRule;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;

hbase-it/src/test/java/org/apache/hadoop/hbase/IntegrationTestRegionReplicaPerf.java

@@ -18,9 +18,21 @@
  */
 package org.apache.hadoop.hbase;
 
-import org.apache.hbase.thirdparty.com.google.common.base.MoreObjects;
+import static java.lang.String.format;
-import org.apache.hbase.thirdparty.com.google.common.collect.Sets;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
 import com.codahale.metrics.Histogram;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Queue;
+import java.util.Set;
+import java.util.concurrent.Callable;
+
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.chaos.actions.MoveRandomRegionOfTableAction;
 import org.apache.hadoop.hbase.chaos.actions.RestartRandomRsExceptMetaAction;
@@ -31,25 +43,19 @@ import org.apache.hadoop.hbase.client.Admin;
 import org.apache.hadoop.hbase.ipc.RpcClient;
 import org.apache.hadoop.hbase.regionserver.DisabledRegionSplitPolicy;
 import org.apache.hadoop.hbase.testclassification.IntegrationTests;
-import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.hbase.util.YammerHistogramUtils;
 import org.apache.hadoop.mapreduce.Counters;
 import org.apache.hadoop.mapreduce.Job;
 import org.apache.hadoop.util.ToolRunner;
+
 import org.junit.experimental.categories.Category;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import org.apache.hbase.thirdparty.com.google.common.base.MoreObjects;
+import org.apache.hbase.thirdparty.com.google.common.collect.Sets;
 import org.apache.hbase.thirdparty.org.apache.commons.cli.CommandLine;
 
-import java.util.*;
-import java.util.concurrent.Callable;
-
-import static java.lang.String.format;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
-
 /**
  * Test for comparing the performance impact of region replicas. Uses
  * components of {@link PerformanceEvaluation}. Does not run from

hbase-it/src/test/java/org/apache/hadoop/hbase/chaos/factories/MobNoKillMonkeyFactory.java

@@ -17,7 +17,24 @@
  */
 package org.apache.hadoop.hbase.chaos.factories;
 
-import org.apache.hadoop.hbase.chaos.actions.*;
+import org.apache.hadoop.hbase.chaos.actions.Action;
+import org.apache.hadoop.hbase.chaos.actions.AddColumnAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeBloomFilterAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeCompressionAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeEncodingAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeVersionsAction;
+import org.apache.hadoop.hbase.chaos.actions.CompactMobAction;
+import org.apache.hadoop.hbase.chaos.actions.CompactRandomRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.CompactTableAction;
+import org.apache.hadoop.hbase.chaos.actions.DumpClusterStatusAction;
+import org.apache.hadoop.hbase.chaos.actions.FlushRandomRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.FlushTableAction;
+import org.apache.hadoop.hbase.chaos.actions.MergeRandomAdjacentRegionsOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.MoveRandomRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.MoveRegionsOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.RemoveColumnAction;
+import org.apache.hadoop.hbase.chaos.actions.SnapshotTableAction;
+import org.apache.hadoop.hbase.chaos.actions.SplitRandomRegionOfTableAction;
 import org.apache.hadoop.hbase.chaos.monkies.ChaosMonkey;
 import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
 import org.apache.hadoop.hbase.chaos.policies.PeriodicRandomActionPolicy;

hbase-it/src/test/java/org/apache/hadoop/hbase/chaos/factories/MobSlowDeterministicMonkeyFactory.java

@@ -18,7 +18,29 @@
 
 package org.apache.hadoop.hbase.chaos.factories;
 
-import org.apache.hadoop.hbase.chaos.actions.*;
+import org.apache.hadoop.hbase.chaos.actions.Action;
+import org.apache.hadoop.hbase.chaos.actions.AddColumnAction;
+import org.apache.hadoop.hbase.chaos.actions.BatchRestartRsAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeBloomFilterAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeCompressionAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeEncodingAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeVersionsAction;
+import org.apache.hadoop.hbase.chaos.actions.CompactMobAction;
+import org.apache.hadoop.hbase.chaos.actions.CompactRandomRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.CompactTableAction;
+import org.apache.hadoop.hbase.chaos.actions.DumpClusterStatusAction;
+import org.apache.hadoop.hbase.chaos.actions.FlushRandomRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.FlushTableAction;
+import org.apache.hadoop.hbase.chaos.actions.MergeRandomAdjacentRegionsOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.MoveRandomRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.MoveRegionsOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.RemoveColumnAction;
+import org.apache.hadoop.hbase.chaos.actions.RestartActiveMasterAction;
+import org.apache.hadoop.hbase.chaos.actions.RestartRandomRsAction;
+import org.apache.hadoop.hbase.chaos.actions.RestartRsHoldingMetaAction;
+import org.apache.hadoop.hbase.chaos.actions.RollingBatchRestartRsAction;
+import org.apache.hadoop.hbase.chaos.actions.SnapshotTableAction;
+import org.apache.hadoop.hbase.chaos.actions.SplitRandomRegionOfTableAction;
 import org.apache.hadoop.hbase.chaos.monkies.ChaosMonkey;
 import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
 import org.apache.hadoop.hbase.chaos.policies.CompositeSequentialPolicy;

hbase-it/src/test/java/org/apache/hadoop/hbase/chaos/factories/SlowDeterministicMonkeyFactory.java

@@ -18,7 +18,31 @@
 
 package org.apache.hadoop.hbase.chaos.factories;
 
-import org.apache.hadoop.hbase.chaos.actions.*;
+import org.apache.hadoop.hbase.chaos.actions.Action;
+import org.apache.hadoop.hbase.chaos.actions.AddColumnAction;
+import org.apache.hadoop.hbase.chaos.actions.BatchRestartRsAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeBloomFilterAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeCompressionAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeEncodingAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeSplitPolicyAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeVersionsAction;
+import org.apache.hadoop.hbase.chaos.actions.CompactRandomRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.CompactTableAction;
+import org.apache.hadoop.hbase.chaos.actions.DecreaseMaxHFileSizeAction;
+import org.apache.hadoop.hbase.chaos.actions.DumpClusterStatusAction;
+import org.apache.hadoop.hbase.chaos.actions.FlushRandomRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.FlushTableAction;
+import org.apache.hadoop.hbase.chaos.actions.MergeRandomAdjacentRegionsOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.MoveRandomRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.MoveRegionsOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.RemoveColumnAction;
+import org.apache.hadoop.hbase.chaos.actions.RestartActiveMasterAction;
+import org.apache.hadoop.hbase.chaos.actions.RestartRandomRsAction;
+import org.apache.hadoop.hbase.chaos.actions.RestartRsHoldingMetaAction;
+import org.apache.hadoop.hbase.chaos.actions.RollingBatchRestartRsAction;
+import org.apache.hadoop.hbase.chaos.actions.SnapshotTableAction;
+import org.apache.hadoop.hbase.chaos.actions.SplitAllRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.SplitRandomRegionOfTableAction;
 import org.apache.hadoop.hbase.chaos.monkies.ChaosMonkey;
 import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
 import org.apache.hadoop.hbase.chaos.policies.CompositeSequentialPolicy;

hbase-it/src/test/java/org/apache/hadoop/hbase/chaos/factories/StressAssignmentManagerMonkeyFactory.java

@@ -17,7 +17,25 @@
  */
 package org.apache.hadoop.hbase.chaos.factories;
 
-import org.apache.hadoop.hbase.chaos.actions.*;
+import org.apache.hadoop.hbase.chaos.actions.Action;
+import org.apache.hadoop.hbase.chaos.actions.AddColumnAction;
+import org.apache.hadoop.hbase.chaos.actions.BatchRestartRsAction;
+import org.apache.hadoop.hbase.chaos.actions.ChangeSplitPolicyAction;
+import org.apache.hadoop.hbase.chaos.actions.CompactRandomRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.CompactTableAction;
+import org.apache.hadoop.hbase.chaos.actions.DecreaseMaxHFileSizeAction;
+import org.apache.hadoop.hbase.chaos.actions.DumpClusterStatusAction;
+import org.apache.hadoop.hbase.chaos.actions.FlushRandomRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.FlushTableAction;
+import org.apache.hadoop.hbase.chaos.actions.MergeRandomAdjacentRegionsOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.MoveRandomRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.MoveRegionsOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.RemoveColumnAction;
+import org.apache.hadoop.hbase.chaos.actions.RestartRandomRsAction;
+import org.apache.hadoop.hbase.chaos.actions.RestartRsHoldingMetaAction;
+import org.apache.hadoop.hbase.chaos.actions.RollingBatchRestartRsAction;
+import org.apache.hadoop.hbase.chaos.actions.SplitAllRegionOfTableAction;
+import org.apache.hadoop.hbase.chaos.actions.SplitRandomRegionOfTableAction;
 import org.apache.hadoop.hbase.chaos.monkies.ChaosMonkey;
 import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
 import org.apache.hadoop.hbase.chaos.policies.CompositeSequentialPolicy;

hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapred/TableSnapshotInputFormat.java

@@ -32,7 +32,6 @@ import org.apache.hadoop.mapred.InputSplit;
 import org.apache.hadoop.mapred.JobConf;
 import org.apache.hadoop.mapred.RecordReader;
 import org.apache.hadoop.mapred.Reporter;
-import org.apache.hadoop.mapreduce.Job;
 
 import java.io.DataInput;
 import java.io.DataOutput;

hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/CellCounter.java

@@ -33,7 +33,6 @@ import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.HBaseConfiguration;
 import org.apache.hadoop.hbase.client.Result;
 import org.apache.hadoop.hbase.client.Scan;
-import org.apache.hadoop.hbase.filter.CompareFilter;
 import org.apache.hadoop.hbase.filter.Filter;
 import org.apache.hadoop.hbase.filter.PrefixFilter;
 import org.apache.hadoop.hbase.filter.RegexStringComparator;

hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/ExportUtils.java

@@ -31,7 +31,6 @@ import org.apache.yetus.audience.InterfaceAudience;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.apache.hadoop.hbase.client.Scan;
-import org.apache.hadoop.hbase.filter.CompareFilter;
 import org.apache.hadoop.hbase.filter.Filter;
 import org.apache.hadoop.hbase.filter.IncompatibleFilterException;
 import org.apache.hadoop.hbase.filter.PrefixFilter;

hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.java

@@ -26,7 +26,6 @@ import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 
 import org.apache.yetus.audience.InterfaceAudience;
 import org.slf4j.Logger;

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapred/TestTableInputFormat.java

@@ -31,9 +31,13 @@ import java.io.IOException;
 import java.util.Arrays;
 import java.util.Map;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hbase.*;
 import org.apache.hadoop.hbase.Cell;
+import org.apache.hadoop.hbase.CompareOperator;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.NotServingRegionException;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.client.ConnectionFactory;
 import org.apache.hadoop.hbase.client.Put;
@@ -41,7 +45,6 @@ import org.apache.hadoop.hbase.client.Result;
 import org.apache.hadoop.hbase.client.ResultScanner;
 import org.apache.hadoop.hbase.client.Scan;
 import org.apache.hadoop.hbase.client.Table;
-import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
 import org.apache.hadoop.hbase.filter.Filter;
 import org.apache.hadoop.hbase.filter.RegexStringComparator;
 import org.apache.hadoop.hbase.filter.RowFilter;

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestCellCounter.java

@@ -21,7 +21,10 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
-import java.io.*;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.PrintStream;
 import org.apache.commons.io.IOUtils;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileUtil;

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestSimpleTotalOrderPartitioner.java

@@ -20,8 +20,9 @@ package org.apache.hadoop.hbase.mapreduce;
 import static org.junit.Assert.assertEquals;
 
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hbase.*;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
 import org.apache.hadoop.hbase.testclassification.MapReduceTests;
 import org.apache.hadoop.hbase.testclassification.SmallTests;

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestTableInputFormat.java

@@ -30,8 +30,13 @@ import static org.mockito.Mockito.spy;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.Map;
-import org.apache.hadoop.hbase.*;
+import org.apache.hadoop.hbase.Cell;
+import org.apache.hadoop.hbase.CompareOperator;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.NotServingRegionException;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.client.ConnectionFactory;
 import org.apache.hadoop.hbase.client.Put;
@@ -39,7 +44,6 @@ import org.apache.hadoop.hbase.client.Result;
 import org.apache.hadoop.hbase.client.ResultScanner;
 import org.apache.hadoop.hbase.client.Scan;
 import org.apache.hadoop.hbase.client.Table;
-import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
 import org.apache.hadoop.hbase.filter.Filter;
 import org.apache.hadoop.hbase.filter.RegexStringComparator;
 import org.apache.hadoop.hbase.filter.RowFilter;

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/snapshot/TestMobExportSnapshot.java

@@ -26,7 +26,6 @@ import org.apache.hadoop.hbase.testclassification.LargeTests;
 import org.apache.hadoop.hbase.testclassification.VerySlowRegionServerTests;
 import org.junit.BeforeClass;
 import org.junit.ClassRule;
-import org.junit.Ignore;
 import org.junit.experimental.categories.Category;
 
 /**

hbase-rest/src/main/java/org/apache/hadoop/hbase/rest/filter/RestCsrfPreventionFilter.java

@@ -35,7 +35,6 @@ import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
 import org.apache.yetus.audience.InterfaceAudience;
-import org.apache.yetus.audience.InterfaceStability;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.apache.hadoop.conf.Configuration;

hbase-rest/src/test/java/org/apache/hadoop/hbase/rest/RowResourceBase.java

@@ -22,8 +22,9 @@ import static org.junit.Assert.assertEquals;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.StringWriter;
-import java.util.*;
 
+import java.util.HashMap;
+import java.util.Map;
 import javax.ws.rs.core.MediaType;
 import javax.xml.bind.JAXBContext;
 import javax.xml.bind.JAXBException;

hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/EndpointObserver.java

@@ -16,19 +16,17 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-
 package org.apache.hadoop.hbase.coprocessor;
 
-import java.io.IOException;
-
-import org.apache.yetus.audience.InterfaceAudience;
-import org.apache.yetus.audience.InterfaceStability;
-import org.apache.hadoop.hbase.Coprocessor;
-import org.apache.hadoop.hbase.HBaseInterfaceAudience;
-
 import com.google.protobuf.Message;
 import com.google.protobuf.Service;
 
+import java.io.IOException;
+
+import org.apache.hadoop.hbase.HBaseInterfaceAudience;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.apache.yetus.audience.InterfaceStability;
+
 /**
  * Coprocessors implement this interface to observe and mediate endpoint invocations
  * on a region.

hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/RegionServerObserver.java

@@ -20,7 +20,6 @@ package org.apache.hadoop.hbase.coprocessor;
 
 import java.io.IOException;
 
-import org.apache.hadoop.hbase.Coprocessor;
 import org.apache.hadoop.hbase.HBaseInterfaceAudience;
 import org.apache.hadoop.hbase.replication.ReplicationEndpoint;
 import org.apache.yetus.audience.InterfaceAudience;

hbase-server/src/main/java/org/apache/hadoop/hbase/io/HalfStoreFileReader.java

@@ -30,7 +30,6 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hbase.Cell;
-import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.PrivateCellUtil;
 import org.apache.hadoop.hbase.KeyValue;

hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/RWQueueRpcExecutor.java

@@ -32,7 +32,6 @@ import org.slf4j.LoggerFactory;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.Action;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.MultiRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.MutateRequest;
-import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.RegionAction;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.ScanRequest;

hbase-server/src/main/java/org/apache/hadoop/hbase/master/RackManager.java

@@ -18,7 +18,6 @@
 package org.apache.hadoop.hbase.master;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 

hbase-server/src/main/java/org/apache/hadoop/hbase/procedure/MasterProcedureManager.java

@@ -22,7 +22,6 @@ import java.io.IOException;
 import org.apache.hadoop.hbase.security.User;
 import org.apache.hadoop.hbase.security.access.AccessChecker;
 import org.apache.yetus.audience.InterfaceAudience;
-import org.apache.yetus.audience.InterfaceStability;
 import org.apache.hadoop.hbase.Stoppable;
 import org.apache.hadoop.hbase.master.MasterServices;
 import org.apache.hadoop.hbase.master.MetricsMaster;

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/ConstantSizeRegionSplitPolicy.java

@@ -24,7 +24,6 @@ import java.util.Random;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.HBaseInterfaceAudience;
 import org.apache.hadoop.hbase.HConstants;
-import org.apache.hadoop.hbase.HTableDescriptor;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.hadoop.hbase.client.TableDescriptor;
 

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/FlushPolicyFactory.java

@@ -21,7 +21,6 @@ import java.io.IOException;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.HBaseInterfaceAudience;
-import org.apache.hadoop.hbase.HTableDescriptor;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/ScannerIdGenerator.java

@@ -21,13 +21,9 @@ package org.apache.hadoop.hbase.regionserver;
 import org.apache.hbase.thirdparty.com.google.common.hash.Hashing;
 
 import java.util.concurrent.atomic.AtomicInteger;
-import java.util.concurrent.atomic.AtomicLong;
-import java.nio.charset.Charset;
 
-import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.ServerName;
 import org.apache.yetus.audience.InterfaceAudience;
-import org.apache.hadoop.hbase.util.Bytes;
 
 /**
  * Generate a new style scanner id to prevent collision with previous started server or other RSs.

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/TimeRangeTracker.java

@@ -26,7 +26,6 @@ import java.io.IOException;
 import java.util.concurrent.atomic.AtomicLong;
 
 import org.apache.hadoop.hbase.Cell;
-import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.PrivateCellUtil;
 import org.apache.hadoop.hbase.io.TimeRange;
 import org.apache.yetus.audience.InterfaceAudience;

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/querymatcher/MajorCompactionScanQueryMatcher.java

@@ -20,7 +20,6 @@ package org.apache.hadoop.hbase.regionserver.querymatcher;
 import java.io.IOException;
 
 import org.apache.hadoop.hbase.Cell;
-import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.PrivateCellUtil;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.hadoop.hbase.regionserver.ScanInfo;

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/querymatcher/MinorCompactionScanQueryMatcher.java

@@ -20,7 +20,6 @@ package org.apache.hadoop.hbase.regionserver.querymatcher;
 import java.io.IOException;
 
 import org.apache.hadoop.hbase.Cell;
-import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.PrivateCellUtil;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.hadoop.hbase.regionserver.ScanInfo;

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/querymatcher/NewVersionBehaviorTracker.java

@@ -34,7 +34,6 @@ import org.apache.hadoop.hbase.PrivateCellUtil;
 import org.apache.hadoop.hbase.KeyValue.Type;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.hadoop.hbase.regionserver.querymatcher.ScanQueryMatcher.MatchCode;
-import org.apache.hadoop.hbase.util.Bytes;
 
 /**
  * A tracker both implementing ColumnTracker and DeleteTracker, used for mvcc-sensitive scanning.

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/querymatcher/NormalUserScanQueryMatcher.java

@@ -20,7 +20,6 @@ package org.apache.hadoop.hbase.regionserver.querymatcher;
 import java.io.IOException;
 
 import org.apache.hadoop.hbase.Cell;
-import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.PrivateCellUtil;
 import org.apache.hadoop.hbase.KeepDeletedCells;
 import org.apache.yetus.audience.InterfaceAudience;

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/querymatcher/StripeCompactionScanQueryMatcher.java

@@ -20,7 +20,6 @@ package org.apache.hadoop.hbase.regionserver.querymatcher;
 import java.io.IOException;
 
 import org.apache.hadoop.hbase.Cell;
-import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.PrivateCellUtil;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.hadoop.hbase.regionserver.ScanInfo;

hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationObserver.java

@@ -25,22 +25,19 @@ import java.util.Optional;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.coprocessor.CoreCoprocessor;
 import org.apache.hadoop.hbase.coprocessor.HasRegionServerServices;
-import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;
-import org.apache.hadoop.hbase.regionserver.RegionServerServices;
-import org.apache.yetus.audience.InterfaceAudience;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.apache.hadoop.hbase.HBaseInterfaceAudience;
-import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.coprocessor.ObserverContext;
+import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;
 import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
 import org.apache.hadoop.hbase.coprocessor.RegionObserver;
 import org.apache.hadoop.hbase.regionserver.HRegionServer;
+import org.apache.hadoop.hbase.regionserver.RegionServerServices;
 import org.apache.hadoop.hbase.util.Pair;
-
+import org.apache.yetus.audience.InterfaceAudience;
-import javax.validation.constraints.Null;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * An Observer to add HFile References to replication queue.

hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompressionTest.java

@@ -31,7 +31,6 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hbase.Cell;
-import org.apache.hadoop.hbase.CellComparatorImpl;
 import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.DoNotRetryIOException;
 import org.apache.hadoop.hbase.HBaseConfiguration;

hbase-server/src/main/java/org/apache/hadoop/hbase/util/RowBloomContext.java

@@ -23,7 +23,6 @@ import java.io.IOException;
 
 import org.apache.hadoop.hbase.Cell;
 import org.apache.hadoop.hbase.CellComparator;
-import org.apache.hadoop.hbase.CellComparatorImpl;
 import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.io.hfile.HFile.Writer;
 import org.apache.yetus.audience.InterfaceAudience;

hbase-server/src/main/java/org/apache/hadoop/hbase/wal/FSHLogProvider.java

@@ -27,7 +27,6 @@ import org.apache.hadoop.hbase.regionserver.wal.ProtobufLogWriter;
 import org.apache.hadoop.hbase.regionserver.wal.WALUtil;
 import org.apache.hadoop.hbase.util.CommonFSUtils;
 import org.apache.hadoop.hbase.util.CommonFSUtils.StreamLacksCapabilityException;
-import org.apache.hadoop.hbase.util.FSUtils;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.yetus.audience.InterfaceStability;
 import org.slf4j.Logger;

hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WALPrettyPrinter.java

@@ -41,8 +41,6 @@ import org.apache.hadoop.hbase.util.FSUtils;
 import org.apache.hadoop.hbase.util.GsonUtil;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.yetus.audience.InterfaceStability;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import org.apache.hbase.thirdparty.com.google.gson.Gson;
 import org.apache.hbase.thirdparty.org.apache.commons.cli.CommandLine;

hbase-server/src/test/java/org/apache/hadoop/hbase/TestClusterPortAssignment.java

@@ -22,7 +22,6 @@ import static org.junit.Assert.assertTrue;
 
 import java.net.BindException;
 
-import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.testclassification.MediumTests;
 
 import org.junit.ClassRule;

hbase-server/src/test/java/org/apache/hadoop/hbase/TestIOFencing.java

@@ -41,7 +41,6 @@ import org.apache.hadoop.hbase.regionserver.HStore;
 import org.apache.hadoop.hbase.regionserver.HStoreFile;
 import org.apache.hadoop.hbase.regionserver.Region;
 import org.apache.hadoop.hbase.regionserver.RegionServerServices;
-import org.apache.hadoop.hbase.regionserver.Store;
 import org.apache.hadoop.hbase.regionserver.compactions.CompactionContext;
 import org.apache.hadoop.hbase.regionserver.throttle.ThroughputController;
 import org.apache.hadoop.hbase.regionserver.wal.WALUtil;

hbase-server/src/test/java/org/apache/hadoop/hbase/backup/TestHFileArchiving.java

@@ -33,8 +33,12 @@ import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.PathFilter;
-import org.apache.hadoop.hbase.*;
+import org.apache.hadoop.hbase.ChoreService;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.Stoppable;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.Admin;
 import org.apache.hadoop.hbase.client.Table;
 import org.apache.hadoop.hbase.master.cleaner.HFileCleaner;

hbase-server/src/test/java/org/apache/hadoop/hbase/client/HConnectionTestingUtility.java

@@ -22,21 +22,21 @@ import java.util.Optional;
 import java.util.concurrent.atomic.AtomicLong;
 
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hbase.RegionLocations;
-import org.apache.hadoop.hbase.TableName;
-import org.apache.hadoop.hbase.HRegionInfo;
 import org.apache.hadoop.hbase.HRegionLocation;
+import org.apache.hadoop.hbase.RegionLocations;
 import org.apache.hadoop.hbase.ServerName;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.ZooKeeperConnectionException;
+import org.apache.hadoop.hbase.coprocessor.ObserverContext;
 import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;
+import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
 import org.apache.hadoop.hbase.coprocessor.RegionObserver;
+import org.apache.hadoop.hbase.ipc.RpcControllerFactory;
+import org.apache.hadoop.hbase.util.Threads;
+import org.mockito.Mockito;
+
 import org.apache.hadoop.hbase.shaded.protobuf.generated.AdminProtos;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos;
-import org.apache.hadoop.hbase.util.Threads;
-import org.apache.hadoop.hbase.coprocessor.ObserverContext;
-import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
-import org.apache.hadoop.hbase.ipc.RpcControllerFactory;
-import org.mockito.Mockito;
 
 /**
  * {@link ClusterConnection} testing utility.

hbase-server/src/test/java/org/apache/hadoop/hbase/client/RestoreSnapshotFromClientAfterSplittingRegionsTestBase.java

@@ -20,7 +20,6 @@ package org.apache.hadoop.hbase.client;
 import java.io.IOException;
 import java.util.List;
 import org.apache.hadoop.hbase.snapshot.SnapshotTestingUtils;
-import org.apache.hadoop.hbase.util.Bytes;
 import org.junit.Test;
 
 public class RestoreSnapshotFromClientAfterSplittingRegionsTestBase

hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncNamespaceAdminApi.java

@@ -29,7 +29,6 @@ import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.HColumnDescriptor;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.HTableDescriptor;
-import org.apache.hadoop.hbase.MiniHBaseCluster;
 import org.apache.hadoop.hbase.NamespaceDescriptor;
 import org.apache.hadoop.hbase.NamespaceExistException;
 import org.apache.hadoop.hbase.NamespaceNotFoundException;

hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestMetaCache.java

@@ -27,8 +27,17 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hbase.*;
+import org.apache.hadoop.hbase.CallQueueTooBigException;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.HColumnDescriptor;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.HTableDescriptor;
+import org.apache.hadoop.hbase.MultiActionResultTooLarge;
+import org.apache.hadoop.hbase.NotServingRegionException;
+import org.apache.hadoop.hbase.RegionTooBusyException;
+import org.apache.hadoop.hbase.RetryImmediatelyException;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.exceptions.ClientExceptionsUtil;
 import org.apache.hadoop.hbase.exceptions.RegionOpeningException;
 import org.apache.hadoop.hbase.quotas.RpcThrottlingException;

hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestMultipleTimestamps.java

@@ -17,14 +17,17 @@
  */
 package org.apache.hadoop.hbase.client;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
 
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
-import org.apache.hadoop.hbase.*;
+import org.apache.hadoop.hbase.Cell;
+import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.testclassification.ClientTests;
 import org.apache.hadoop.hbase.testclassification.LargeTests;
 import org.apache.hadoop.hbase.util.Bytes;
@@ -115,7 +118,7 @@ public class TestMultipleTimestamps {
     ResultScanner scanner = scan(ht, FAMILY, scanRows, scanColumns,
         scanTimestamps, scanMaxVersions);
 
-    Cell [] kvs;
+    Cell[] kvs;
 
     kvs = scanner.next().rawCells();
     assertEquals(2, kvs.length);

hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestPutWithDelete.java

@@ -19,8 +19,11 @@ package org.apache.hadoop.hbase.client;
 
 import static org.junit.Assert.assertTrue;
 
-import org.apache.hadoop.hbase.*;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.KeyValue;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.testclassification.ClientTests;
 import org.apache.hadoop.hbase.testclassification.MediumTests;
 import org.apache.hadoop.hbase.util.Bytes;

hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestScannerTimeout.java

@@ -18,7 +18,6 @@
 package org.apache.hadoop.hbase.client;
 
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.fail;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.HBaseClassTestRule;

hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestTimestampsFilter.java

@@ -17,14 +17,18 @@
  */
 package org.apache.hadoop.hbase.client;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
 
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
-import org.apache.hadoop.hbase.*;
+import org.apache.hadoop.hbase.Cell;
+import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.filter.Filter;
 import org.apache.hadoop.hbase.filter.TimestampsFilter;
 import org.apache.hadoop.hbase.testclassification.ClientTests;

hbase-server/src/test/java/org/apache/hadoop/hbase/constraint/TestConstraint.java

@@ -17,19 +17,16 @@
  */
 package org.apache.hadoop.hbase.constraint;
 
-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 java.util.List;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.HBaseTestingUtility;
 import org.apache.hadoop.hbase.HColumnDescriptor;
 import org.apache.hadoop.hbase.HTableDescriptor;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.Put;
-import org.apache.hadoop.hbase.client.RetriesExhaustedWithDetailsException;
 import org.apache.hadoop.hbase.client.Table;
 import org.apache.hadoop.hbase.coprocessor.CoprocessorHost;
 import org.apache.hadoop.hbase.testclassification.MediumTests;

hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestCoprocessorStop.java

@@ -23,8 +23,10 @@ import java.io.IOException;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hbase.*;
+import org.apache.hadoop.hbase.CoprocessorEnvironment;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.MiniHBaseCluster;
 import org.apache.hadoop.hbase.testclassification.CoprocessorTests;
 import org.apache.hadoop.hbase.testclassification.MediumTests;
 import org.junit.AfterClass;

hbase-server/src/test/java/org/apache/hadoop/hbase/filter/TestDependentColumnFilter.java

@@ -37,7 +37,6 @@ import org.apache.hadoop.hbase.KeyValue;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.Put;
 import org.apache.hadoop.hbase.client.Scan;
-import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
 import org.apache.hadoop.hbase.filter.Filter.ReturnCode;
 import org.apache.hadoop.hbase.regionserver.HRegion;
 import org.apache.hadoop.hbase.regionserver.InternalScanner;

hbase-server/src/test/java/org/apache/hadoop/hbase/filter/TestFilterListOnMini.java

@@ -20,7 +20,11 @@ package org.apache.hadoop.hbase.filter;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.HBaseTestingUtility;
 import org.apache.hadoop.hbase.TableName;
-import org.apache.hadoop.hbase.client.*;
+import org.apache.hadoop.hbase.client.Put;
+import org.apache.hadoop.hbase.client.Result;
+import org.apache.hadoop.hbase.client.ResultScanner;
+import org.apache.hadoop.hbase.client.Scan;
+import org.apache.hadoop.hbase.client.Table;
 import org.apache.hadoop.hbase.filter.FilterList.Operator;
 import org.apache.hadoop.hbase.testclassification.FilterTests;
 import org.apache.hadoop.hbase.testclassification.MediumTests;

hbase-server/src/test/java/org/apache/hadoop/hbase/filter/TestFilterSerialization.java

@@ -25,7 +25,6 @@ import java.util.List;
 import java.util.TreeSet;
 import org.apache.hadoop.hbase.CompareOperator;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
-import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
 import org.apache.hadoop.hbase.filter.MultiRowRangeFilter.RowRange;
 import org.apache.hadoop.hbase.testclassification.FilterTests;
 import org.apache.hadoop.hbase.testclassification.SmallTests;

hbase-server/src/test/java/org/apache/hadoop/hbase/filter/TestSingleColumnValueFilter.java

@@ -28,7 +28,6 @@ import org.apache.hadoop.hbase.Cell;
 import org.apache.hadoop.hbase.CompareOperator;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.KeyValue;
-import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
 import org.apache.hadoop.hbase.testclassification.FilterTests;
 import org.apache.hadoop.hbase.testclassification.SmallTests;
 import org.apache.hadoop.hbase.util.Bytes;

hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestScannerSelectionUsingKeyRange.java

@@ -39,7 +39,6 @@ import org.apache.hadoop.hbase.client.Scan;
 import org.apache.hadoop.hbase.regionserver.BloomType;
 import org.apache.hadoop.hbase.regionserver.HRegion;
 import org.apache.hadoop.hbase.regionserver.InternalScanner;
-import org.apache.hadoop.hbase.regionserver.Region;
 import org.apache.hadoop.hbase.testclassification.IOTests;
 import org.apache.hadoop.hbase.testclassification.SmallTests;
 import org.apache.hadoop.hbase.util.Bytes;

hbase-server/src/test/java/org/apache/hadoop/hbase/ipc/AbstractTestIPC.java

@@ -57,7 +57,6 @@ import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.io.compress.GzipCodec;
 import org.apache.hadoop.util.StringUtils;
-import org.junit.BeforeClass;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestMaster.java

@@ -25,9 +25,7 @@ import static org.junit.Assert.fail;
 
 import java.io.IOException;
 import java.util.List;
-import java.util.Map;
 import java.util.concurrent.atomic.AtomicReference;
-import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hbase.HBaseClassTestRule;

hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestMasterMetrics.java

@@ -20,7 +20,6 @@ package org.apache.hadoop.hbase.master;
 import java.io.IOException;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.CompatibilityFactory;
-import org.apache.hadoop.hbase.CoordinatedStateManager;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.HBaseTestingUtility;
 import org.apache.hadoop.hbase.MiniHBaseCluster;

hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestMirroringTableStateManager.java

@@ -32,7 +32,6 @@ import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.zookeeper.KeeperException;
 import org.junit.After;
-import org.junit.Assert;
 import org.junit.Before;
 import org.junit.ClassRule;
 import org.junit.Rule;

hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestTableStateManager.java

@@ -28,7 +28,6 @@ import org.apache.hadoop.hbase.testclassification.MasterTests;
 import org.apache.hadoop.hbase.util.JVMClusterUtil;
 import org.apache.hadoop.hbase.util.Threads;
 import org.junit.After;
-import org.junit.Assert;
 import org.junit.Before;
 import org.junit.ClassRule;
 import org.junit.Rule;

hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestFavoredNodeTableImport.java

@@ -19,7 +19,6 @@ package org.apache.hadoop.hbase.master.balancer;
 
 import static org.apache.hadoop.hbase.favored.FavoredNodeAssignmentHelper.FAVORED_NODES_NUM;
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 
 import java.util.List;

hbase-server/src/test/java/org/apache/hadoop/hbase/master/cleaner/TestLogsCleaner.java

@@ -20,7 +20,6 @@ package org.apache.hadoop.hbase.master.cleaner;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
-import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.spy;
 
@@ -31,7 +30,6 @@ import java.util.Arrays;
 import java.util.Iterator;
 import java.util.List;
 import java.util.concurrent.ThreadLocalRandom;
-import java.util.concurrent.atomic.AtomicBoolean;
 
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.lang3.RandomUtils;
@@ -53,7 +51,6 @@ import org.apache.hadoop.hbase.ZooKeeperConnectionException;
 import org.apache.hadoop.hbase.client.ClusterConnection;
 import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.master.HMaster;
-import org.apache.hadoop.hbase.replication.ReplicationException;
 import org.apache.hadoop.hbase.replication.ReplicationQueueStorage;
 import org.apache.hadoop.hbase.replication.ReplicationStorageFactory;
 import org.apache.hadoop.hbase.replication.master.ReplicationLogCleaner;
@@ -68,8 +65,6 @@ import org.junit.BeforeClass;
 import org.junit.ClassRule;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;
-import org.mockito.invocation.InvocationOnMock;
-import org.mockito.stubbing.Answer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

hbase-server/src/test/java/org/apache/hadoop/hbase/mob/TestDefaultMobStoreFlusher.java

@@ -25,7 +25,11 @@ import org.apache.hadoop.hbase.HBaseTestingUtility;
 import org.apache.hadoop.hbase.HColumnDescriptor;
 import org.apache.hadoop.hbase.HTableDescriptor;
 import org.apache.hadoop.hbase.TableName;
-import org.apache.hadoop.hbase.client.*;
+import org.apache.hadoop.hbase.client.Put;
+import org.apache.hadoop.hbase.client.Result;
+import org.apache.hadoop.hbase.client.ResultScanner;
+import org.apache.hadoop.hbase.client.Scan;
+import org.apache.hadoop.hbase.client.Table;
 import org.apache.hadoop.hbase.testclassification.LargeTests;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.junit.AfterClass;

hbase-server/src/test/java/org/apache/hadoop/hbase/mob/TestExpiredMobFileCleaner.java

@@ -27,7 +27,10 @@ import org.apache.hadoop.hbase.HBaseTestingUtility;
 import org.apache.hadoop.hbase.HColumnDescriptor;
 import org.apache.hadoop.hbase.HTableDescriptor;
 import org.apache.hadoop.hbase.TableName;
-import org.apache.hadoop.hbase.client.*;
+import org.apache.hadoop.hbase.client.Admin;
+import org.apache.hadoop.hbase.client.BufferedMutator;
+import org.apache.hadoop.hbase.client.ConnectionFactory;
+import org.apache.hadoop.hbase.client.Put;
 import org.apache.hadoop.hbase.testclassification.MediumTests;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.util.ToolRunner;

hbase-server/src/test/java/org/apache/hadoop/hbase/namespace/TestNamespaceAuditor.java

@@ -48,7 +48,6 @@ import org.apache.hadoop.hbase.MiniHBaseCluster;
 import org.apache.hadoop.hbase.NamespaceDescriptor;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.Waiter;
-import org.apache.hadoop.hbase.Waiter.ExplainingPredicate;
 import org.apache.hadoop.hbase.client.Admin;
 import org.apache.hadoop.hbase.client.CompactionState;
 import org.apache.hadoop.hbase.client.Connection;
@@ -83,8 +82,6 @@ import org.apache.hadoop.hbase.snapshot.RestoreSnapshotException;
 import org.apache.hadoop.hbase.testclassification.MediumTests;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.hbase.util.FSUtils;
-import org.apache.hadoop.hbase.util.RetryCounter;
-import org.apache.hadoop.hbase.util.Threads;
 import org.apache.zookeeper.KeeperException;
 import org.junit.After;
 import org.junit.AfterClass;

hbase-server/src/test/java/org/apache/hadoop/hbase/quotas/TestNamespaceQuotaViolationStore.java

@@ -29,7 +29,6 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicReference;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
-import org.apache.hadoop.hbase.HRegionInfo;
 import org.apache.hadoop.hbase.NamespaceDescriptor;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.Connection;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/DelegatingKeyValueScanner.java

@@ -23,8 +23,6 @@ import java.io.IOException;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hbase.Cell;
 import org.apache.hadoop.hbase.client.Scan;
-import org.apache.hadoop.hbase.regionserver.KeyValueScanner;
-import org.apache.hadoop.hbase.regionserver.Store;
 
 public class DelegatingKeyValueScanner implements KeyValueScanner {
   protected KeyValueScanner delegate;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/OOMERegionServer.java

@@ -22,7 +22,6 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
-import org.apache.hadoop.hbase.CoordinatedStateManager;
 import org.apache.hadoop.hbase.HBaseConfiguration;
 import org.apache.hadoop.hbase.client.Put;
 import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestCompactSplitThread.java

@@ -23,9 +23,13 @@ import java.util.Collection;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hbase.*;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
-import org.apache.hadoop.hbase.client.*;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.HColumnDescriptor;
+import org.apache.hadoop.hbase.HTableDescriptor;
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.client.Connection;
+import org.apache.hadoop.hbase.client.ConnectionFactory;
 import org.apache.hadoop.hbase.snapshot.SnapshotTestingUtils;
 import org.apache.hadoop.hbase.testclassification.MediumTests;
 import org.apache.hadoop.hbase.util.Bytes;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestDeleteMobTable.java

@@ -26,7 +26,11 @@ import org.apache.hadoop.hbase.HBaseTestingUtility;
 import org.apache.hadoop.hbase.HColumnDescriptor;
 import org.apache.hadoop.hbase.HTableDescriptor;
 import org.apache.hadoop.hbase.TableName;
-import org.apache.hadoop.hbase.client.*;
+import org.apache.hadoop.hbase.client.Put;
+import org.apache.hadoop.hbase.client.Result;
+import org.apache.hadoop.hbase.client.ResultScanner;
+import org.apache.hadoop.hbase.client.Scan;
+import org.apache.hadoop.hbase.client.Table;
 import org.apache.hadoop.hbase.mob.MobConstants;
 import org.apache.hadoop.hbase.mob.MobUtils;
 import org.apache.hadoop.hbase.testclassification.MediumTests;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestMasterAddressTracker.java

@@ -23,8 +23,9 @@ import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
 import java.util.concurrent.Semaphore;
-import org.apache.hadoop.hbase.*;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.ServerName;
 import org.apache.hadoop.hbase.testclassification.MediumTests;
 import org.apache.hadoop.hbase.testclassification.RegionServerTests;
 import org.apache.hadoop.hbase.zookeeper.MasterAddressTracker;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestQosFunction.java

@@ -20,8 +20,10 @@ package org.apache.hadoop.hbase.regionserver;
 import static org.mockito.Mockito.when;
 
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hbase.*;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.QosTestHelper;
 import org.apache.hadoop.hbase.testclassification.MediumTests;
 import org.apache.hadoop.hbase.testclassification.RegionServerTests;
 import org.junit.Before;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionOpen.java

@@ -18,7 +18,6 @@
 package org.apache.hadoop.hbase.regionserver;
 
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
 import java.io.IOException;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionServerAbort.java

@@ -54,7 +54,6 @@ import org.apache.hadoop.hbase.testclassification.MediumTests;
 import org.apache.hadoop.hbase.testclassification.RegionServerTests;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.hbase.util.JVMClusterUtil;
-import org.apache.hadoop.hbase.util.Threads;
 import org.apache.hadoop.hbase.wal.WAL;
 import org.apache.hadoop.hbase.wal.WALEdit;
 import org.apache.hadoop.hdfs.DFSConfigKeys;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestResettingCounters.java

@@ -24,8 +24,15 @@ import java.io.IOException;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hbase.*;
+import org.apache.hadoop.hbase.Cell;
+import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.HColumnDescriptor;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.HRegionInfo;
+import org.apache.hadoop.hbase.HTableDescriptor;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.Durability;
 import org.apache.hadoop.hbase.client.Increment;
 import org.apache.hadoop.hbase.client.Result;
@@ -102,7 +109,7 @@ public class TestResettingCounters {
       // increment all qualifiers, should have value=6 for all
       Result result = region.increment(all, HConstants.NO_NONCE, HConstants.NO_NONCE);
       assertEquals(numQualifiers, result.size());
-      Cell [] kvs = result.rawCells();
+      Cell[] kvs = result.rawCells();
       for (int i=0;i<kvs.length;i++) {
         System.out.println(kvs[i].toString());
         assertTrue(CellUtil.matchingQualifier(kvs[i], qualifiers[i]));

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRowTooBig.java

@@ -19,8 +19,13 @@ package org.apache.hadoop.hbase.regionserver;
 
 import java.io.IOException;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hbase.*;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.HColumnDescriptor;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.HRegionInfo;
+import org.apache.hadoop.hbase.HTableDescriptor;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.Get;
 import org.apache.hadoop.hbase.client.Put;
 import org.apache.hadoop.hbase.client.RowTooBigException;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestSimpleTimeRangeTracker.java

@@ -23,7 +23,6 @@ import static org.junit.Assert.assertTrue;
 
 import java.io.DataOutputStream;
 import java.io.IOException;
-import java.util.Optional;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.io.ByteArrayOutputStream;
 import org.apache.hadoop.hbase.io.TimeRange;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestWalAndCompactingMemStoreFlush.java

@@ -26,8 +26,15 @@ import java.util.concurrent.ThreadPoolExecutor;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hbase.*;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.HColumnDescriptor;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.HRegionInfo;
+import org.apache.hadoop.hbase.HTableDescriptor;
+import org.apache.hadoop.hbase.MemoryCompactionPolicy;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.Put;
 import org.apache.hadoop.hbase.testclassification.LargeTests;
 import org.apache.hadoop.hbase.testclassification.RegionServerTests;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/AbstractTestFSWAL.java

@@ -17,13 +17,14 @@
  */
 package org.apache.hadoop.hbase.regionserver.wal;
 
-import static org.junit.Assert.*;
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
-import static org.hamcrest.CoreMatchers.*;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -34,6 +35,7 @@ import java.util.Set;
 import java.util.TreeMap;
 import java.util.UUID;
 import java.util.concurrent.atomic.AtomicBoolean;
+
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
@@ -68,6 +70,7 @@ import org.apache.hadoop.hbase.wal.WAL;
 import org.apache.hadoop.hbase.wal.WALEdit;
 import org.apache.hadoop.hbase.wal.WALKey;
 import org.apache.hadoop.hbase.wal.WALKeyImpl;
+
 import org.junit.AfterClass;
 import org.junit.Before;
 import org.junit.BeforeClass;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/FaultyProtobufLogReader.java

@@ -22,8 +22,6 @@ import java.util.LinkedList;
 import java.util.Queue;
 
 import org.apache.hadoop.hbase.wal.WAL.Entry;
-import org.apache.hadoop.hbase.wal.WALEdit;
-import org.apache.hadoop.hbase.wal.WALKeyImpl;
 
 public class FaultyProtobufLogReader extends ProtobufLogReader {
 

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALConfiguration.java

@@ -40,7 +40,6 @@ import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.util.Arrays;
-import java.util.List;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.fail;

hbase-server/src/test/java/org/apache/hadoop/hbase/replication/TestMultiSlaveReplication.java

@@ -27,8 +27,14 @@ import java.util.Arrays;
 import java.util.concurrent.CountDownLatch;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hbase.*;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.HColumnDescriptor;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.HTableDescriptor;
+import org.apache.hadoop.hbase.MiniHBaseCluster;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.Admin;
 import org.apache.hadoop.hbase.client.Delete;
 import org.apache.hadoop.hbase.client.Get;

hbase-server/src/test/java/org/apache/hadoop/hbase/replication/regionserver/TestRegionReplicaReplicationEndpointNoMaster.java

@@ -19,7 +19,6 @@ package org.apache.hadoop.hbase.replication.regionserver;
 
 import static org.apache.hadoop.hbase.regionserver.TestRegionServerNoMaster.closeRegion;
 import static org.apache.hadoop.hbase.regionserver.TestRegionServerNoMaster.openRegion;
-import static org.junit.Assert.assertEquals;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 

hbase-server/src/test/java/org/apache/hadoop/hbase/tool/TestCanaryTool.java

@@ -31,8 +31,11 @@ import static org.mockito.Mockito.verify;
 
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
-import org.apache.hadoop.hbase.*;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.ServerName;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
 import org.apache.hadoop.hbase.client.Put;
 import org.apache.hadoop.hbase.client.RegionInfo;

hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestFSVisitor.java

@@ -28,8 +28,10 @@ import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.HBaseTestingUtility;
 import org.apache.hadoop.hbase.testclassification.MediumTests;
 import org.apache.hadoop.hbase.testclassification.MiscTests;
-import org.junit.*;
+import org.junit.After;
+import org.junit.Before;
 import org.junit.ClassRule;
+import org.junit.Test;
 import org.junit.experimental.categories.Category;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;