schedule additional tasks when killactions are being dispatched
---------------------------------------------------------------
Key: MAPREDUCE-2218
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2218
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: jobtracker
Reporter: Joydeep Sen Sarma
we see a very high turnaround time for preemption (from the time preemption
happens to the time other jobs are scheduled). part of the reason is that we do
not dispatch new tasks until the TT confirms termination of killed tasks. The
high turnaround time causes all kinds of issues (we keep issuing preemptions
repeatedly. other jobs of higher priority arrive and get scheduled).
One remediation is that one can dispatch additional tasks equal to the number
of tasks killed whenever we send killaction to a TT. that would reduce the
turnaround time somewhat.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
