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https://issues.apache.org/jira/browse/HADOOP-4623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12648615#action_12648615
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Amar Kamat commented on HADOOP-4623:
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I ran gridmix on _trunk_ and _trunk+patch-v1.2_ and here are the results
||type||time(secs)||
|trunk|2373|
|trunk+patch-v1.2|2556|
This patch takes ~3min more than trunk. I will benchmark this again and see if
the results are consistent.
> Running tasks are not maintained by JobInProgress if speculation is off
> -----------------------------------------------------------------------
>
> Key: HADOOP-4623
> URL: https://issues.apache.org/jira/browse/HADOOP-4623
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Amar Kamat
> Assignee: Amar Kamat
> Attachments: HADOOP-4623-v1.1.patch, HADOOP-4623-v1.2.patch
>
>
> {{JobInProgress}} doesnt maintain any structure for running tasks if
> speculation is turned _off_. {{getRunningMapCache()}} in {{JobInProgress}}
> exposes the running map cache. This api returns an empty {{Map}} if
> speculation turned off.
> _Usage_ :
> {{CapicityScheduler}} requires a list of running tasks for both speculated
> and non-speculated jobs. See HADOOP-4558 to see how this issue affects
> {{CapacityScheduler}}.
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