Github user srowen commented on a diff in the pull request:
    --- Diff: 
core/src/main/java/org/apache/spark/io/ ---
    @@ -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
    + *
    + *
    + *
    + * 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.
    + */
    +import javax.annotation.concurrent.ThreadSafe;
    +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}.
    + * Unfortunately, this is not something already available in JDK,
    + * {@link} supports reading a file using nio,
    + * but does not support buffering.
    + *
    + * TODO: support {@link #mark(int)}/{@link #reset()}
    --- End diff --
    I don't really care, but this could be a comment inside the class rather 
than user-facing. In fact I don't even know it's a to-do.

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