ByteBuffer-based read API for DFSClient
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Key: HDFS-2834
URL: https://issues.apache.org/jira/browse/HDFS-2834
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Henry Robinson
Assignee: Henry Robinson
The {{DFSClient}} read-path always copies bytes into a JVM-allocated
{{byte[]}}. Although for many clients this is desired behaviour, in certain
situations, such as native-reads through libhdfs, this imposes an extra copy
penalty since the {{byte[]}} needs to be copied out again into a natively
readable memory area.
For these cases, it would be preferable to allow the client to supply its own
buffer, wrapped in a {{ByteBuffer}}, to avoid that final copy overhead.
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