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: Bug Components: mr-am, mrv2 Affects Versions: 0.23.0 Reporter: Vinod Kumar Vavilapalli Assignee: Vinod Kumar Vavilapalli Fix For: 0.23.1 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