[ https://issues.apache.org/jira/browse/MAPREDUCE-2340?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kang Xiao updated MAPREDUCE-2340: --------------------------------- Attachment: MAPREDUCE-2340.patch updated > optimize JobInProgress.initTasks() > ---------------------------------- > > Key: MAPREDUCE-2340 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-2340 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Components: jobtracker > Affects Versions: 0.20.1, 0.21.0 > Reporter: Kang Xiao > Attachments: MAPREDUCE-2340.patch, MAPREDUCE-2340.patch > > > JobTracker's hostnameToNodeMap cache can speed up JobInProgress.initTasks() > and JobInProgress.createCache() significantly. A test for 1 job with 100000 > maps on a 2400 cluster shows nearly 10 and 50 times speed up for initTasks() > and createCache(). -- This message is automatically generated by JIRA. - For more information on JIRA, see: http://www.atlassian.com/software/jira