Make use of fadvise in the NM's shuffle handler
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Key: MAPREDUCE-3289
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3289
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: mrv2, nodemanager, performance
Affects Versions: 0.23.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Using the new NativeIO fadvise functions, we can make the NodeManager prefetch
map output before it's send over the socket, and drop it out of the fs cache
once it's been sent (since it's very rare for an output to have to be re-sent).
This improves IO efficiency and reduces cache pollution.
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