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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