Github user sitalkedia commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15408#discussion_r83532901
  
    --- Diff: 
core/src/main/java/org/apache/spark/io/NioBufferedFileInputStream.java ---
    @@ -0,0 +1,142 @@
    +/*
    + * 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.
    + */
    +package org.apache.spark.io;
    +
    +import org.apache.spark.storage.StorageUtils;
    +
    +import javax.annotation.concurrent.ThreadSafe;
    +import java.io.File;
    +import java.io.IOException;
    +import java.io.InputStream;
    +import java.nio.ByteBuffer;
    +import java.nio.channels.FileChannel;
    +import java.nio.file.StandardOpenOption;
    +
    +/**
    + * {@link InputStream} implementation which uses direct buffer
    + * to read a file to avoid extra copy of data between Java and
    + * native memory which happens when using {@link 
java.io.BufferedInputStream}.
    + * Unfortunately, this is not something already available in JDK,
    + * {@link sun.nio.ch.ChannelInputStream} supports reading a file using nio,
    + * but does not support buffering.
    + *
    + * TODO: support {@link #mark(int)}/{@link #reset()}
    + *
    + */
    +@ThreadSafe
    --- End diff --
    
    Alright, removed it for consistency. 


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