Sandy Ryza created MAPREDUCE-5484: ------------------------------------- Summary: 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
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