[ https://issues.apache.org/jira/browse/MAPREDUCE-5484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sandy Ryza updated MAPREDUCE-5484: ---------------------------------- Attachment: MAPREDUCE-5484.patch > YarnChild unnecessarily loads job conf twice > -------------------------------------------- > > Key: MAPREDUCE-5484 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-5484 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Components: task > Affects Versions: 2.1.0-beta > Reporter: Sandy Ryza > Labels: perfomance > Attachments: MAPREDUCE-5484.patch > > > In MR task processes, a JobConf is instantiated with the same job.xml twice, > once at the beginning of main() and once in configureTask. IIUC, the second > instantiation is not necessary. These take time reading from disk and > parsing XML. > Removing the second instantiation shaved a second off the average map task > time in a 1,000-map sleep job. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira