Todd Lipcon created MAPREDUCE-4229: -------------------------------------- Summary: Intern counter names in the JT Key: MAPREDUCE-4229 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4229 Project: Hadoop Map/Reduce Issue Type: Improvement Components: jobtracker Affects Versions: 1.0.2 Reporter: Todd Lipcon
In our experience, most of the memory in production JTs goes to storing counter names (String objects and character arrays). Since most counter names are reused again and again, it would be a big memory savings to keep a hash set of already-used counter names within a job, and refer to the same object from all tasks. -- 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