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

    https://github.com/apache/spark/pull/15408#discussion_r83476597
  
    --- Diff: 
core/src/main/java/org/apache/spark/io/NioBufferedFileInputStream.java ---
    @@ -72,30 +74,35 @@ private boolean refill() throws IOException {
       }
     
       @Override
    -  public int read() throws IOException {
    +  public synchronized int read() throws IOException {
         if (!refill()) {
           return -1;
         }
         return byteBuffer.get() & 0xFF;
       }
     
       @Override
    -  public int read(byte[] b, int offset, int len) throws IOException {
    +  public synchronized int read(byte[] b, int offset, int len) throws 
IOException {
         if (!refill()) {
           return -1;
         }
    +    if ((offset | len | (offset + len) | (b.length - (offset + len))) < 0) 
{
    --- End diff --
    
    @srowen - Agreed, the condition was little confusing. Changed it to make it 
clearer. 


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