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https://issues.apache.org/jira/browse/MAPREDUCE-3008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13122541#comment-13122541
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Hudson commented on MAPREDUCE-3008:
-----------------------------------
Integrated in Hadoop-Mapreduce-trunk-Commit #1048 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/1048/])
MAPREDUCE-3008. Improvements to cumulative CPU emulation for short running
tasks in Gridmix. (amarrk)
amarrk : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1179933
Files :
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
*
/hadoop/common/trunk/hadoop-mapreduce-project/src/contrib/gridmix/src/java/org/apache/hadoop/mapred/gridmix/LoadJob.java
*
/hadoop/common/trunk/hadoop-mapreduce-project/src/contrib/gridmix/src/java/org/apache/hadoop/mapred/gridmix/emulators/resourceusage/CumulativeCpuUsageEmulatorPlugin.java
*
/hadoop/common/trunk/hadoop-mapreduce-project/src/contrib/gridmix/src/java/org/apache/hadoop/mapred/gridmix/emulators/resourceusage/ResourceUsageEmulatorPlugin.java
*
/hadoop/common/trunk/hadoop-mapreduce-project/src/contrib/gridmix/src/java/org/apache/hadoop/mapred/gridmix/emulators/resourceusage/ResourceUsageMatcher.java
*
/hadoop/common/trunk/hadoop-mapreduce-project/src/contrib/gridmix/src/java/org/apache/hadoop/mapred/gridmix/emulators/resourceusage/TotalHeapUsageEmulatorPlugin.java
*
/hadoop/common/trunk/hadoop-mapreduce-project/src/contrib/gridmix/src/test/org/apache/hadoop/mapred/gridmix/TestResourceUsageEmulators.java
> [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: 0.24.0
>
> Attachments: mapreduce-2591-v1.4.2.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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