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Date: Fri, 7 Oct 2011 12:15:32 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-3008) [Gridmix] Improve cumulative
 CPU usage emulation for short running tasks
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-3008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13122726#comment-13122726 ] 

Hudson commented on MAPREDUCE-3008:
-----------------------------------

Integrated in Hadoop-Hdfs-trunk #823 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/823/])
    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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