Fix checkstyle issues

Author: bharathv

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

@@ -20,22 +20,6 @@
 
 import static org.apache.hadoop.hbase.ipc.IPCUtil.toIOE;
 import static org.apache.hadoop.hbase.ipc.IPCUtil.wrapException;
-
-import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;
-import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;
-import org.apache.hbase.thirdparty.com.google.common.cache.CacheBuilder;
-import org.apache.hbase.thirdparty.com.google.common.cache.CacheLoader;
-import org.apache.hbase.thirdparty.com.google.common.cache.LoadingCache;
-import org.apache.hbase.thirdparty.com.google.protobuf.BlockingRpcChannel;
-import org.apache.hbase.thirdparty.com.google.protobuf.Descriptors;
-import org.apache.hbase.thirdparty.com.google.protobuf.Message;
-import org.apache.hbase.thirdparty.com.google.protobuf.RpcChannel;
-import org.apache.hbase.thirdparty.com.google.protobuf.RpcController;
-import org.apache.hbase.thirdparty.com.google.protobuf.ServiceException;
-import org.apache.hbase.thirdparty.com.google.protobuf.RpcCallback;
-
-import org.apache.hbase.thirdparty.io.netty.util.HashedWheelTimer;
-
 import java.io.IOException;
 import java.net.InetSocketAddress;
 import java.net.SocketAddress;
@@ -52,14 +36,9 @@
 import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
-
-import java.util.stream.Collectors;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.ServerName;
-import org.apache.yetus.audience.InterfaceAudience;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 import org.apache.hadoop.hbase.client.MetricsConnection;
 import org.apache.hadoop.hbase.codec.Codec;
 import org.apache.hadoop.hbase.codec.KeyValueCodec;
@@ -74,7 +53,22 @@
 import org.apache.hadoop.ipc.RemoteException;
 import org.apache.hadoop.security.token.TokenIdentifier;
 import org.apache.hadoop.security.token.TokenSelector;
-
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;
+import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;
+import org.apache.hbase.thirdparty.com.google.common.cache.CacheBuilder;
+import org.apache.hbase.thirdparty.com.google.common.cache.CacheLoader;
+import org.apache.hbase.thirdparty.com.google.common.cache.LoadingCache;
+import org.apache.hbase.thirdparty.com.google.protobuf.BlockingRpcChannel;
+import org.apache.hbase.thirdparty.com.google.protobuf.Descriptors;
+import org.apache.hbase.thirdparty.com.google.protobuf.Message;
+import org.apache.hbase.thirdparty.com.google.protobuf.RpcCallback;
+import org.apache.hbase.thirdparty.com.google.protobuf.RpcChannel;
+import org.apache.hbase.thirdparty.com.google.protobuf.RpcController;
+import org.apache.hbase.thirdparty.com.google.protobuf.ServiceException;
+import org.apache.hbase.thirdparty.io.netty.util.HashedWheelTimer;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos;
 
 /**
@@ -234,7 +228,9 @@ private void cleanupIdleConnections() {
         // have some pending calls on connection so we should not shutdown the connection outside.
         // The connection itself will disconnect if there is no pending call for maxIdleTime.
         if (conn.getLastTouched() < closeBeforeTime && !conn.isActive()) {
-          if (LOG.isTraceEnabled()) LOG.trace("Cleanup idle connection to " + conn.remoteId().address);
+          if (LOG.isTraceEnabled()) {
+            LOG.trace("Cleanup idle connection to " + conn.remoteId().address);
+          }
           connections.removeValue(conn.remoteId(), conn);
           conn.cleanupConnection();
         }

hbase-common/src/main/java/org/apache/hadoop/hbase/util/PrettyPrinter.java

@@ -25,7 +25,6 @@
 import java.util.Objects;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-import java.util.stream.Collectors;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.exceptions.HBaseException;
 import org.apache.yetus.audience.InterfaceAudience;