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https://issues.apache.org/jira/browse/HADOOP-4623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653193#action_12653193
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Runping Qi commented on HADOOP-4623:
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sounds good.
> 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,
> HADOOP-4623-v1.3.patch, HADOOP-4623-v1.4.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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