Fix Findbugs & Checkstyle.

tez-runtime-library/src/main/java/org/apache/tez/runtime/library/common/sort/impl/IFile.java

@@ -29,9 +29,7 @@
 
 import com.google.common.annotations.VisibleForTesting;
 
-import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.io.BoundedByteArrayOutputStream;
-import org.apache.hadoop.util.functional.FutureIO;
 import org.apache.tez.runtime.library.common.task.local.output.TezTaskOutput;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

tez-tools/tez-tfile-parser/findbugs-exclude.xml

@@ -0,0 +1,16 @@
+<!--
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License. See accompanying LICENSE file.
+-->
+<FindBugsFilter>
+
+</FindBugsFilter>

tez-tools/tez-tfile-parser/src/main/java/org/apache/tez/tools/TFileRecordReader.java

@@ -39,6 +39,7 @@
 import java.io.EOFException;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
 
 /**
  * Simple record reader which reads the TFile and emits it as key, value pair.
@@ -86,7 +87,7 @@ private void populateKV(TFile.Reader.Scanner.Entry entry) throws IOException {
     //splitpath contains the machine name. Create the key as splitPath + realKey
     String keyStr = new StringBuilder()
         .append(splitPath.getName()).append(":")
-        .append(new String(keyBytesWritable.getBytes()))
+        .append(new String(keyBytesWritable.getBytes(),  StandardCharsets.UTF_8))
         .toString();
 
     /**