HDDS-1473. Checkstyle fixes.

Author: swagle

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/helpers/ContainerUtils.java

@@ -18,41 +18,33 @@
 
 package org.apache.hadoop.ozone.container.common.helpers;
 
-import com.google.common.base.Preconditions;
+import static org.apache.commons.io.FilenameUtils.removeExtension;
+import static org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos.Result.CONTAINER_CHECKSUM_ERROR;
+import static org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos.Result.NO_SUCH_ALGORITHM;
+import static org.apache.hadoop.ozone.container.common.impl.ContainerData.CHARSET_ENCODING;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Paths;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
+
 import org.apache.commons.codec.digest.DigestUtils;
 import org.apache.hadoop.fs.FileAlreadyExistsException;
 import org.apache.hadoop.hdds.protocol.DatanodeDetails;
-import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos
-    .ContainerCommandRequestProto;
-import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos
-    .ContainerCommandResponseProto;
+import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos.ContainerCommandRequestProto;
+import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos.ContainerCommandResponseProto;
 import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos.Result;
-import org.apache.hadoop.hdds.protocol.proto.HddsProtos;
-import org.apache.hadoop.hdds.scm.container.common.helpers
-    .StorageContainerException;
+import org.apache.hadoop.hdds.scm.container.common.helpers.StorageContainerException;
 import org.apache.hadoop.ozone.OzoneConsts;
 import org.apache.hadoop.ozone.container.common.impl.ContainerData;
 import org.apache.hadoop.ozone.container.common.impl.ContainerDataYaml;
 import org.apache.hadoop.ozone.container.common.impl.ContainerSet;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.nio.file.Paths;
 import org.yaml.snakeyaml.Yaml;
 
-import static org.apache.commons.io.FilenameUtils.removeExtension;
-import static org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos
-    .Result.CONTAINER_CHECKSUM_ERROR;
-import static org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos
-    .Result.NO_SUCH_ALGORITHM;
-import static org.apache.hadoop.ozone.container.common.impl.ContainerData
-    .CHARSET_ENCODING;
+import com.google.common.base.Preconditions;
 
 /**
  * A set of helper functions to create proper responses.

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/helpers/DatanodeIdYaml.java

@@ -32,15 +32,13 @@
 import org.yaml.snakeyaml.DumperOptions;
 import org.yaml.snakeyaml.Yaml;
 
-import com.google.common.base.Preconditions;
-
 /**
  * Class for creating datanode.id file in yaml format.
  */
-public class DatanodeIdYaml {
+public final class DatanodeIdYaml {
 
   private DatanodeIdYaml() {
-
+    // static helper methods only, no state.
   }
 
   /**