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Vinod Kumar Vavilapalli commented on MAPREDUCE-4749: ---------------------------------------------------- Added Bobby and Ravi onto the watch list as they are linked to MAPREDUCE-4088. So what is happening is that because of the patch, every clean up action like KillTaskAction, KillJobAction *ALWAYS* wait for 5 seconds before processing. Because of this, all clean up actions delay, and because till TT actually cleans up a task/job, JobTracker keeps on dishing out new duplicate clean-up actions for the same task/job. This causes a avalanche of clean-up actions, even only one task is cleanup, the queue grows continuously and so later, even killing jobs will take for ever (even though clients are not blocked). > Killing multiple attempts of a task taker longer as more attempts are killed > ---------------------------------------------------------------------------- > > Key: MAPREDUCE-4749 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-4749 > Project: Hadoop Map/Reduce > Issue Type: Bug > Affects Versions: 1.1.0 > Reporter: Arpit Gupta > Assignee: Vinod Kumar Vavilapalli > > The following was noticed on a mr job running on hadoop 1.1.0 > 1. Start an mr job with 1 mapper > 2. Wait for a min > 3. Kill the first attempt of the mapper and then subsequently kill the other > 3 attempts in order to fail the job > The time taken to kill the task grew exponentially. > 1st attempt was killed immediately. > 2nd attempt took a little over a min > 3rd attempt took approx. 20 mins > 4th attempt took around 3 hrs. > The command used to kill the attempt was "hadoop job -fail-task" > Note that the command returned immediately as soon as the fail attempt was > accepted but the time the attempt was actually killed was as stated above. -- 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