zhaoyunjiong created MAPREDUCE-5541: ---------------------------------------
Summary: improved algorithm for whether need speculative task Key: MAPREDUCE-5541 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5541 Project: Hadoop Map/Reduce Issue Type: Improvement Reporter: zhaoyunjiong Assignee: zhaoyunjiong Most of time, tasks won't start running at same time. In this case hasSpeculativeTask in TaskInProgress not working very well. Some times, some tasks just start running, and scheduler already decide it need speculative task to run. And this waste a lot of resource. -- 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