[jira] [Created] (HADOOP-8135) Add ByteBufferReadable interface to FSDataInputStream

["Henry Robinson (Created) (JIRA)" <ji...@apache.org>]

Add ByteBufferReadable interface to FSDataInputStream
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                 Key: HADOOP-8135
                 URL: https://issues.apache.org/jira/browse/HADOOP-8135
             Project: Hadoop Common
          Issue Type: New Feature
          Components: fs
            Reporter: Henry Robinson
            Assignee: Henry Robinson


To prepare for HDFS-2834, it's useful to add an interface to FSDataInputStream (and others inside hdfs) that adds a read(ByteBuffer...) method as follows:

{code}
  /**
   * Reads up to buf.remaining() bytes into buf. Callers should use
   * buf.limit(..) to control the size of the desired read.
   * 
   * After the call, buf.position() should be unchanged, and therefore any data
   * can be immediately read from buf.
   * 
   * @param buf
   * @return - the number of bytes available to read from buf
   * @throws IOException
   */
  public int read(ByteBuffer buf) throws IOException;
{code}

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