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https://issues.apache.org/jira/browse/HDFS-3053?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved HDFS-3053.
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Resolution: Duplicate
looks like Dhruba filed this at the same time I did. Resolving as dup of
HDFS-3051
> Support for true zero-copy (mmap-based) reads
> ---------------------------------------------
>
> 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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