Make use of fadvise in the NM's shuffle handler -----------------------------------------------
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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira