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Posted to mapreduce-issues@hadoop.apache.org by "Matt Foley (JIRA)" <ji...@apache.org> on 2012/08/24 01:10:42 UTC
[jira] [Updated] (MAPREDUCE-3008) [Gridmix] Improve cumulative CPU
usage emulation for short running tasks
[ https://issues.apache.org/jira/browse/MAPREDUCE-3008?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matt Foley updated MAPREDUCE-3008:
----------------------------------
Target Version/s: (was: 0.23.1)
Fix Version/s: 1.1.0
> [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
> Assignee: Amar Kamat
> Labels: cpu-emulation, gridmix
> Fix For: 1.1.0, 3.0.0
>
> Attachments: mapreduce-2591-v1.4.2.patch, mapreduce-2591-v1.7-0.20-security.patch, mapreduce-2591-v1.7.patch
>
>
> 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.
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