Support for true zero-copy (mmap-based) reads
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Key: HDFS-3053
URL: https://issues.apache.org/jira/browse/HDFS-3053
Project: Hadoop HDFS
Issue Type: New Feature
Components: hdfs client
Reporter: Todd Lipcon
Continuing a discussion started in HDFS-2834, it would be slick to provide
support for a true zero-copy read API. In this style API, rather than having
the user pass buffers to read into, the DFS client would provide buffers to the
user. This allows the client to pass slices of mmaped blocks, for example,
which can cut one or two copies out of many read scenarios.
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