[ https://issues.apache.org/jira/browse/MAPREDUCE-3566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vinod Kumar Vavilapalli updated MAPREDUCE-3566: ----------------------------------------------- Attachment: MAPREDUCE-3566-20120103.txt Final clean patch with tests. > MR AM slows down due to repeatedly constructing ContainerLaunchContext > ---------------------------------------------------------------------- > > Key: MAPREDUCE-3566 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-3566 > Project: Hadoop Map/Reduce > Issue Type: Sub-task > Components: mr-am, mrv2 > Affects Versions: 0.23.0 > Reporter: Vinod Kumar Vavilapalli > Assignee: Vinod Kumar Vavilapalli > Priority: Critical > Fix For: 0.23.1 > > Attachments: MAPREDUCE-3566-20111215.txt, > MAPREDUCE-3566-20111220.txt, MAPREDUCE-3566-20120103.txt > > > The construction of the context is expensive, includes per-task trips to > NameNode for obtaining the information about job.jar, job splits etc which is > redundant across all tasks. > We should have a common job-level context and a task-specific context > inheriting from the common job-level context. -- 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