[Gridmix] Improve cumulative CPU usage emulation for short running tasks
------------------------------------------------------------------------
Key: MAPREDUCE-3008
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3008
Project: Hadoop Map/Reduce
Issue Type: Sub-task
Components: contrib/gridmix
Affects Versions: 0.24.0
Reporter: Amar Kamat
Fix For: 0.24.0
CPU emulation in Gridmix fails to meet the expected target if the map has no
data to sort/spill/merge. There are 2 major reasons for this:
1. The map task end immediately ends soon after the map task. The map progress
is 67% while the map phase ends.
2. Currently, the sort (comparator) doesnt emulate CPU. If the map is short
lived, the CPU emulation thread (spawned from the map task in cleanup) doesn't
get a chance to emulate.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
