HDFS-9870. Remove unused imports from DFSUtil. Contributed by Brahma Reddy Battula.

(cherry picked from commit 2137e8feeb5c5c88d3a80db3a334fd472f299ee4)

Conflicts:
	hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -1911,6 +1911,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-9855. Modify TestAuditLoggerWithCommands to workaround the absence
     of HDFS-8332 (Kuhu Shukla via kihwal)
 
+    HDFS-9870. Remove unused imports from DFSUtil.
+    (Brahma Reddy Battula via cnauroth)
+
 Release 2.7.3 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSUtil.java

@@ -27,7 +27,6 @@ import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_HTTPS_ADDRESS_DE
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_HTTPS_ADDRESS_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_HTTP_ADDRESS_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_HTTP_ADDRESS_KEY;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_LIFELINE_RPC_ADDRESS_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RPC_ADDRESS_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_SECONDARY_HTTP_ADDRESS_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_SERVICE_RPC_ADDRESS_KEY;
@@ -54,7 +53,6 @@ import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.ThreadLocalRandom;
 
-import com.google.common.collect.Sets;
 import org.apache.commons.cli.CommandLine;
 import org.apache.commons.cli.CommandLineParser;
 import org.apache.commons.cli.Option;
@@ -68,10 +66,7 @@ import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.crypto.key.KeyProvider;
 import org.apache.hadoop.crypto.key.KeyProviderCryptoExtension;
-import org.apache.hadoop.crypto.key.KeyProviderFactory;
-import org.apache.hadoop.fs.BlockLocation;
 import org.apache.hadoop.fs.CommonConfigurationKeys;
-import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
@@ -93,6 +88,7 @@ import com.google.common.base.Charsets;
 import com.google.common.base.Joiner;
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
 import com.google.protobuf.BlockingService;
 
 @InterfaceAudience.Private